| File: | jdk/src/hotspot/share/opto/loopopts.cpp |
| Warning: | line 2243, column 9 Value stored to 'dict' during its initialization is never read |
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| 1 | /* |
| 2 | * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 20 | * or visit www.oracle.com if you need additional information or have any |
| 21 | * questions. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include "precompiled.hpp" |
| 26 | #include "gc/shared/barrierSet.hpp" |
| 27 | #include "gc/shared/c2/barrierSetC2.hpp" |
| 28 | #include "memory/allocation.inline.hpp" |
| 29 | #include "memory/resourceArea.hpp" |
| 30 | #include "opto/addnode.hpp" |
| 31 | #include "opto/callnode.hpp" |
| 32 | #include "opto/castnode.hpp" |
| 33 | #include "opto/connode.hpp" |
| 34 | #include "opto/castnode.hpp" |
| 35 | #include "opto/divnode.hpp" |
| 36 | #include "opto/loopnode.hpp" |
| 37 | #include "opto/matcher.hpp" |
| 38 | #include "opto/mulnode.hpp" |
| 39 | #include "opto/movenode.hpp" |
| 40 | #include "opto/opaquenode.hpp" |
| 41 | #include "opto/rootnode.hpp" |
| 42 | #include "opto/subnode.hpp" |
| 43 | #include "opto/subtypenode.hpp" |
| 44 | #include "utilities/macros.hpp" |
| 45 | |
| 46 | //============================================================================= |
| 47 | //------------------------------split_thru_phi--------------------------------- |
| 48 | // Split Node 'n' through merge point if there is enough win. |
| 49 | Node* PhaseIdealLoop::split_thru_phi(Node* n, Node* region, int policy) { |
| 50 | if (n->Opcode() == Op_ConvI2L && n->bottom_type() != TypeLong::LONG) { |
| 51 | // ConvI2L may have type information on it which is unsafe to push up |
| 52 | // so disable this for now |
| 53 | return NULL__null; |
| 54 | } |
| 55 | |
| 56 | // Splitting range check CastIIs through a loop induction Phi can |
| 57 | // cause new Phis to be created that are left unrelated to the loop |
| 58 | // induction Phi and prevent optimizations (vectorization) |
| 59 | if (n->Opcode() == Op_CastII && region->is_CountedLoop() && |
| 60 | n->in(1) == region->as_CountedLoop()->phi()) { |
| 61 | return NULL__null; |
| 62 | } |
| 63 | |
| 64 | // Bail out if 'n' is a Div or Mod node whose zero check was removed earlier (i.e. control is NULL) and its divisor is an induction variable |
| 65 | // phi p of a trip-counted (integer) loop whose inputs could be zero (include zero in their type range). p could have a more precise type |
| 66 | // range that does not necessarily include all values of its inputs. Since each of these inputs will be a divisor of the newly cloned nodes |
| 67 | // of 'n', we need to bail out of one of these divisors could be zero (zero in its type range). |
| 68 | if ((n->Opcode() == Op_DivI || n->Opcode() == Op_ModI) && n->in(0) == NULL__null |
| 69 | && region->is_CountedLoop() && n->in(2) == region->as_CountedLoop()->phi()) { |
| 70 | Node* phi = region->as_CountedLoop()->phi(); |
| 71 | for (uint i = 1; i < phi->req(); i++) { |
| 72 | if (_igvn.type(phi->in(i))->filter_speculative(TypeInt::ZERO) != Type::TOP) { |
| 73 | // Zero could be a possible value but we already removed the zero check. Bail out to avoid a possible division by zero at a later point. |
| 74 | return NULL__null; |
| 75 | } |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | int wins = 0; |
| 80 | assert(!n->is_CFG(), "")do { if (!(!n->is_CFG())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 80, "assert(" "!n->is_CFG()" ") failed", ""); ::breakpoint (); } } while (0); |
| 81 | assert(region->is_Region(), "")do { if (!(region->is_Region())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 81, "assert(" "region->is_Region()" ") failed", ""); ::breakpoint (); } } while (0); |
| 82 | |
| 83 | const Type* type = n->bottom_type(); |
| 84 | const TypeOopPtr* t_oop = _igvn.type(n)->isa_oopptr(); |
| 85 | Node* phi; |
| 86 | if (t_oop != NULL__null && t_oop->is_known_instance_field()) { |
| 87 | int iid = t_oop->instance_id(); |
| 88 | int index = C->get_alias_index(t_oop); |
| 89 | int offset = t_oop->offset(); |
| 90 | phi = new PhiNode(region, type, NULL__null, iid, index, offset); |
| 91 | } else { |
| 92 | phi = PhiNode::make_blank(region, n); |
| 93 | } |
| 94 | uint old_unique = C->unique(); |
| 95 | for (uint i = 1; i < region->req(); i++) { |
| 96 | Node* x; |
| 97 | Node* the_clone = NULL__null; |
| 98 | if (region->in(i) == C->top()) { |
| 99 | x = C->top(); // Dead path? Use a dead data op |
| 100 | } else { |
| 101 | x = n->clone(); // Else clone up the data op |
| 102 | the_clone = x; // Remember for possible deletion. |
| 103 | // Alter data node to use pre-phi inputs |
| 104 | if (n->in(0) == region) |
| 105 | x->set_req( 0, region->in(i) ); |
| 106 | for (uint j = 1; j < n->req(); j++) { |
| 107 | Node* in = n->in(j); |
| 108 | if (in->is_Phi() && in->in(0) == region) |
| 109 | x->set_req(j, in->in(i)); // Use pre-Phi input for the clone |
| 110 | } |
| 111 | } |
| 112 | // Check for a 'win' on some paths |
| 113 | const Type* t = x->Value(&_igvn); |
| 114 | |
| 115 | bool singleton = t->singleton(); |
| 116 | |
| 117 | // A TOP singleton indicates that there are no possible values incoming |
| 118 | // along a particular edge. In most cases, this is OK, and the Phi will |
| 119 | // be eliminated later in an Ideal call. However, we can't allow this to |
| 120 | // happen if the singleton occurs on loop entry, as the elimination of |
| 121 | // the PhiNode may cause the resulting node to migrate back to a previous |
| 122 | // loop iteration. |
| 123 | if (singleton && t == Type::TOP) { |
| 124 | // Is_Loop() == false does not confirm the absence of a loop (e.g., an |
| 125 | // irreducible loop may not be indicated by an affirmative is_Loop()); |
| 126 | // therefore, the only top we can split thru a phi is on a backedge of |
| 127 | // a loop. |
| 128 | singleton &= region->is_Loop() && (i != LoopNode::EntryControl); |
| 129 | } |
| 130 | |
| 131 | if (singleton) { |
| 132 | wins++; |
| 133 | x = ((PhaseGVN&)_igvn).makecon(t); |
| 134 | } else { |
| 135 | // We now call Identity to try to simplify the cloned node. |
| 136 | // Note that some Identity methods call phase->type(this). |
| 137 | // Make sure that the type array is big enough for |
| 138 | // our new node, even though we may throw the node away. |
| 139 | // (Note: This tweaking with igvn only works because x is a new node.) |
| 140 | _igvn.set_type(x, t); |
| 141 | // If x is a TypeNode, capture any more-precise type permanently into Node |
| 142 | // otherwise it will be not updated during igvn->transform since |
| 143 | // igvn->type(x) is set to x->Value() already. |
| 144 | x->raise_bottom_type(t); |
| 145 | Node* y = x->Identity(&_igvn); |
| 146 | if (y != x) { |
| 147 | wins++; |
| 148 | x = y; |
| 149 | } else { |
| 150 | y = _igvn.hash_find(x); |
| 151 | if (y) { |
| 152 | wins++; |
| 153 | x = y; |
| 154 | } else { |
| 155 | // Else x is a new node we are keeping |
| 156 | // We do not need register_new_node_with_optimizer |
| 157 | // because set_type has already been called. |
| 158 | _igvn._worklist.push(x); |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | if (x != the_clone && the_clone != NULL__null) |
| 163 | _igvn.remove_dead_node(the_clone); |
| 164 | phi->set_req( i, x ); |
| 165 | } |
| 166 | // Too few wins? |
| 167 | if (wins <= policy) { |
| 168 | _igvn.remove_dead_node(phi); |
| 169 | return NULL__null; |
| 170 | } |
| 171 | |
| 172 | // Record Phi |
| 173 | register_new_node( phi, region ); |
| 174 | |
| 175 | for (uint i2 = 1; i2 < phi->req(); i2++) { |
| 176 | Node *x = phi->in(i2); |
| 177 | // If we commoned up the cloned 'x' with another existing Node, |
| 178 | // the existing Node picks up a new use. We need to make the |
| 179 | // existing Node occur higher up so it dominates its uses. |
| 180 | Node *old_ctrl; |
| 181 | IdealLoopTree *old_loop; |
| 182 | |
| 183 | if (x->is_Con()) { |
| 184 | // Constant's control is always root. |
| 185 | set_ctrl(x, C->root()); |
| 186 | continue; |
| 187 | } |
| 188 | // The occasional new node |
| 189 | if (x->_idx >= old_unique) { // Found a new, unplaced node? |
| 190 | old_ctrl = NULL__null; |
| 191 | old_loop = NULL__null; // Not in any prior loop |
| 192 | } else { |
| 193 | old_ctrl = get_ctrl(x); |
| 194 | old_loop = get_loop(old_ctrl); // Get prior loop |
| 195 | } |
| 196 | // New late point must dominate new use |
| 197 | Node *new_ctrl = dom_lca(old_ctrl, region->in(i2)); |
| 198 | if (new_ctrl == old_ctrl) // Nothing is changed |
| 199 | continue; |
| 200 | |
| 201 | IdealLoopTree *new_loop = get_loop(new_ctrl); |
| 202 | |
| 203 | // Don't move x into a loop if its uses are |
| 204 | // outside of loop. Otherwise x will be cloned |
| 205 | // for each use outside of this loop. |
| 206 | IdealLoopTree *use_loop = get_loop(region); |
| 207 | if (!new_loop->is_member(use_loop) && |
| 208 | (old_loop == NULL__null || !new_loop->is_member(old_loop))) { |
| 209 | // Take early control, later control will be recalculated |
| 210 | // during next iteration of loop optimizations. |
| 211 | new_ctrl = get_early_ctrl(x); |
| 212 | new_loop = get_loop(new_ctrl); |
| 213 | } |
| 214 | // Set new location |
| 215 | set_ctrl(x, new_ctrl); |
| 216 | // If changing loop bodies, see if we need to collect into new body |
| 217 | if (old_loop != new_loop) { |
| 218 | if (old_loop && !old_loop->_child) |
| 219 | old_loop->_body.yank(x); |
| 220 | if (!new_loop->_child) |
| 221 | new_loop->_body.push(x); // Collect body info |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | return phi; |
| 226 | } |
| 227 | |
| 228 | //------------------------------dominated_by------------------------------------ |
| 229 | // Replace the dominated test with an obvious true or false. Place it on the |
| 230 | // IGVN worklist for later cleanup. Move control-dependent data Nodes on the |
| 231 | // live path up to the dominating control. |
| 232 | void PhaseIdealLoop::dominated_by( Node *prevdom, Node *iff, bool flip, bool exclude_loop_predicate ) { |
| 233 | if (VerifyLoopOptimizations && PrintOpto) { tty->print_cr("dominating test"); } |
| 234 | |
| 235 | // prevdom is the dominating projection of the dominating test. |
| 236 | assert(iff->is_If(), "must be")do { if (!(iff->is_If())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 236, "assert(" "iff->is_If()" ") failed", "must be"); :: breakpoint(); } } while (0); |
| 237 | assert(iff->Opcode() == Op_If ||do { if (!(iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode () == Op_RangeCheck)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 241, "assert(" "iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode() == Op_RangeCheck" ") failed", "Check this code when new subtype is added"); :: breakpoint(); } } while (0) |
| 238 | iff->Opcode() == Op_CountedLoopEnd ||do { if (!(iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode () == Op_RangeCheck)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 241, "assert(" "iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode() == Op_RangeCheck" ") failed", "Check this code when new subtype is added"); :: breakpoint(); } } while (0) |
| 239 | iff->Opcode() == Op_LongCountedLoopEnd ||do { if (!(iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode () == Op_RangeCheck)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 241, "assert(" "iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode() == Op_RangeCheck" ") failed", "Check this code when new subtype is added"); :: breakpoint(); } } while (0) |
| 240 | iff->Opcode() == Op_RangeCheck,do { if (!(iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode () == Op_RangeCheck)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 241, "assert(" "iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode() == Op_RangeCheck" ") failed", "Check this code when new subtype is added"); :: breakpoint(); } } while (0) |
| 241 | "Check this code when new subtype is added")do { if (!(iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode () == Op_RangeCheck)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 241, "assert(" "iff->Opcode() == Op_If || iff->Opcode() == Op_CountedLoopEnd || iff->Opcode() == Op_LongCountedLoopEnd || iff->Opcode() == Op_RangeCheck" ") failed", "Check this code when new subtype is added"); :: breakpoint(); } } while (0); |
| 242 | |
| 243 | int pop = prevdom->Opcode(); |
| 244 | assert( pop == Op_IfFalse || pop == Op_IfTrue, "" )do { if (!(pop == Op_IfFalse || pop == Op_IfTrue)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 244, "assert(" "pop == Op_IfFalse || pop == Op_IfTrue" ") failed" , ""); ::breakpoint(); } } while (0); |
| 245 | if (flip) { |
| 246 | if (pop == Op_IfTrue) |
| 247 | pop = Op_IfFalse; |
| 248 | else |
| 249 | pop = Op_IfTrue; |
| 250 | } |
| 251 | // 'con' is set to true or false to kill the dominated test. |
| 252 | Node *con = _igvn.makecon(pop == Op_IfTrue ? TypeInt::ONE : TypeInt::ZERO); |
| 253 | set_ctrl(con, C->root()); // Constant gets a new use |
| 254 | // Hack the dominated test |
| 255 | _igvn.replace_input_of(iff, 1, con); |
| 256 | |
| 257 | // If I dont have a reachable TRUE and FALSE path following the IfNode then |
| 258 | // I can assume this path reaches an infinite loop. In this case it's not |
| 259 | // important to optimize the data Nodes - either the whole compilation will |
| 260 | // be tossed or this path (and all data Nodes) will go dead. |
| 261 | if (iff->outcnt() != 2) return; |
| 262 | |
| 263 | // Make control-dependent data Nodes on the live path (path that will remain |
| 264 | // once the dominated IF is removed) become control-dependent on the |
| 265 | // dominating projection. |
| 266 | Node* dp = iff->as_If()->proj_out_or_null(pop == Op_IfTrue); |
| 267 | |
| 268 | // Loop predicates may have depending checks which should not |
| 269 | // be skipped. For example, range check predicate has two checks |
| 270 | // for lower and upper bounds. |
| 271 | if (dp == NULL__null) |
| 272 | return; |
| 273 | |
| 274 | ProjNode* dp_proj = dp->as_Proj(); |
| 275 | ProjNode* unc_proj = iff->as_If()->proj_out(1 - dp_proj->_con)->as_Proj(); |
| 276 | if (exclude_loop_predicate && |
| 277 | (unc_proj->is_uncommon_trap_proj(Deoptimization::Reason_predicate) != NULL__null || |
| 278 | unc_proj->is_uncommon_trap_proj(Deoptimization::Reason_profile_predicate) != NULL__null || |
| 279 | unc_proj->is_uncommon_trap_proj(Deoptimization::Reason_range_check) != NULL__null)) { |
| 280 | // If this is a range check (IfNode::is_range_check), do not |
| 281 | // reorder because Compile::allow_range_check_smearing might have |
| 282 | // changed the check. |
| 283 | return; // Let IGVN transformation change control dependence. |
| 284 | } |
| 285 | |
| 286 | IdealLoopTree* old_loop = get_loop(dp); |
| 287 | |
| 288 | for (DUIterator_Fast imax, i = dp->fast_outs(imax); i < imax; i++) { |
| 289 | Node* cd = dp->fast_out(i); // Control-dependent node |
| 290 | // Do not rewire Div and Mod nodes which could have a zero divisor to avoid skipping their zero check. |
| 291 | if (cd->depends_only_on_test() && _igvn.no_dependent_zero_check(cd)) { |
| 292 | assert(cd->in(0) == dp, "")do { if (!(cd->in(0) == dp)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 292, "assert(" "cd->in(0) == dp" ") failed", ""); ::breakpoint (); } } while (0); |
| 293 | _igvn.replace_input_of(cd, 0, prevdom); |
| 294 | set_early_ctrl(cd, false); |
| 295 | IdealLoopTree* new_loop = get_loop(get_ctrl(cd)); |
| 296 | if (old_loop != new_loop) { |
| 297 | if (!old_loop->_child) { |
| 298 | old_loop->_body.yank(cd); |
| 299 | } |
| 300 | if (!new_loop->_child) { |
| 301 | new_loop->_body.push(cd); |
| 302 | } |
| 303 | } |
| 304 | --i; |
| 305 | --imax; |
| 306 | } |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | //------------------------------has_local_phi_input---------------------------- |
| 311 | // Return TRUE if 'n' has Phi inputs from its local block and no other |
| 312 | // block-local inputs (all non-local-phi inputs come from earlier blocks) |
| 313 | Node *PhaseIdealLoop::has_local_phi_input( Node *n ) { |
| 314 | Node *n_ctrl = get_ctrl(n); |
| 315 | // See if some inputs come from a Phi in this block, or from before |
| 316 | // this block. |
| 317 | uint i; |
| 318 | for( i = 1; i < n->req(); i++ ) { |
| 319 | Node *phi = n->in(i); |
| 320 | if( phi->is_Phi() && phi->in(0) == n_ctrl ) |
| 321 | break; |
| 322 | } |
| 323 | if( i >= n->req() ) |
| 324 | return NULL__null; // No Phi inputs; nowhere to clone thru |
| 325 | |
| 326 | // Check for inputs created between 'n' and the Phi input. These |
| 327 | // must split as well; they have already been given the chance |
| 328 | // (courtesy of a post-order visit) and since they did not we must |
| 329 | // recover the 'cost' of splitting them by being very profitable |
| 330 | // when splitting 'n'. Since this is unlikely we simply give up. |
| 331 | for( i = 1; i < n->req(); i++ ) { |
| 332 | Node *m = n->in(i); |
| 333 | if( get_ctrl(m) == n_ctrl && !m->is_Phi() ) { |
| 334 | // We allow the special case of AddP's with no local inputs. |
| 335 | // This allows us to split-up address expressions. |
| 336 | if (m->is_AddP() && |
| 337 | get_ctrl(m->in(2)) != n_ctrl && |
| 338 | get_ctrl(m->in(3)) != n_ctrl) { |
| 339 | // Move the AddP up to dominating point |
| 340 | Node* c = find_non_split_ctrl(idom(n_ctrl)); |
| 341 | if (c->is_OuterStripMinedLoop()) { |
| 342 | c->as_Loop()->verify_strip_mined(1); |
| 343 | c = c->in(LoopNode::EntryControl); |
| 344 | } |
| 345 | set_ctrl_and_loop(m, c); |
| 346 | continue; |
| 347 | } |
| 348 | return NULL__null; |
| 349 | } |
| 350 | assert(n->is_Phi() || m->is_Phi() || is_dominator(get_ctrl(m), n_ctrl), "m has strange control")do { if (!(n->is_Phi() || m->is_Phi() || is_dominator(get_ctrl (m), n_ctrl))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 350, "assert(" "n->is_Phi() || m->is_Phi() || is_dominator(get_ctrl(m), n_ctrl)" ") failed", "m has strange control"); ::breakpoint(); } } while (0); |
| 351 | } |
| 352 | |
| 353 | return n_ctrl; |
| 354 | } |
| 355 | |
| 356 | //------------------------------remix_address_expressions---------------------- |
| 357 | // Rework addressing expressions to get the most loop-invariant stuff |
| 358 | // moved out. We'd like to do all associative operators, but it's especially |
| 359 | // important (common) to do address expressions. |
| 360 | Node *PhaseIdealLoop::remix_address_expressions( Node *n ) { |
| 361 | if (!has_ctrl(n)) return NULL__null; |
| 362 | Node *n_ctrl = get_ctrl(n); |
| 363 | IdealLoopTree *n_loop = get_loop(n_ctrl); |
| 364 | |
| 365 | // See if 'n' mixes loop-varying and loop-invariant inputs and |
| 366 | // itself is loop-varying. |
| 367 | |
| 368 | // Only interested in binary ops (and AddP) |
| 369 | if( n->req() < 3 || n->req() > 4 ) return NULL__null; |
| 370 | |
| 371 | Node *n1_ctrl = get_ctrl(n->in( 1)); |
| 372 | Node *n2_ctrl = get_ctrl(n->in( 2)); |
| 373 | Node *n3_ctrl = get_ctrl(n->in(n->req() == 3 ? 2 : 3)); |
| 374 | IdealLoopTree *n1_loop = get_loop( n1_ctrl ); |
| 375 | IdealLoopTree *n2_loop = get_loop( n2_ctrl ); |
| 376 | IdealLoopTree *n3_loop = get_loop( n3_ctrl ); |
| 377 | |
| 378 | // Does one of my inputs spin in a tighter loop than self? |
| 379 | if( (n_loop->is_member( n1_loop ) && n_loop != n1_loop) || |
| 380 | (n_loop->is_member( n2_loop ) && n_loop != n2_loop) || |
| 381 | (n_loop->is_member( n3_loop ) && n_loop != n3_loop) ) |
| 382 | return NULL__null; // Leave well enough alone |
| 383 | |
| 384 | // Is at least one of my inputs loop-invariant? |
| 385 | if( n1_loop == n_loop && |
| 386 | n2_loop == n_loop && |
| 387 | n3_loop == n_loop ) |
| 388 | return NULL__null; // No loop-invariant inputs |
| 389 | |
| 390 | |
| 391 | int n_op = n->Opcode(); |
| 392 | |
| 393 | // Replace expressions like ((V+I) << 2) with (V<<2 + I<<2). |
| 394 | if( n_op == Op_LShiftI ) { |
| 395 | // Scale is loop invariant |
| 396 | Node *scale = n->in(2); |
| 397 | Node *scale_ctrl = get_ctrl(scale); |
| 398 | IdealLoopTree *scale_loop = get_loop(scale_ctrl ); |
| 399 | if( n_loop == scale_loop || !scale_loop->is_member( n_loop ) ) |
| 400 | return NULL__null; |
| 401 | const TypeInt *scale_t = scale->bottom_type()->isa_int(); |
| 402 | if( scale_t && scale_t->is_con() && scale_t->get_con() >= 16 ) |
| 403 | return NULL__null; // Dont bother with byte/short masking |
| 404 | // Add must vary with loop (else shift would be loop-invariant) |
| 405 | Node *add = n->in(1); |
| 406 | Node *add_ctrl = get_ctrl(add); |
| 407 | IdealLoopTree *add_loop = get_loop(add_ctrl); |
| 408 | //assert( n_loop == add_loop, "" ); |
| 409 | if( n_loop != add_loop ) return NULL__null; // happens w/ evil ZKM loops |
| 410 | |
| 411 | // Convert I-V into I+ (0-V); same for V-I |
| 412 | if( add->Opcode() == Op_SubI && |
| 413 | _igvn.type( add->in(1) ) != TypeInt::ZERO ) { |
| 414 | Node *zero = _igvn.intcon(0); |
| 415 | set_ctrl(zero, C->root()); |
| 416 | Node *neg = new SubINode( _igvn.intcon(0), add->in(2) ); |
| 417 | register_new_node( neg, get_ctrl(add->in(2) ) ); |
| 418 | add = new AddINode( add->in(1), neg ); |
| 419 | register_new_node( add, add_ctrl ); |
| 420 | } |
| 421 | if( add->Opcode() != Op_AddI ) return NULL__null; |
| 422 | // See if one add input is loop invariant |
| 423 | Node *add_var = add->in(1); |
| 424 | Node *add_var_ctrl = get_ctrl(add_var); |
| 425 | IdealLoopTree *add_var_loop = get_loop(add_var_ctrl ); |
| 426 | Node *add_invar = add->in(2); |
| 427 | Node *add_invar_ctrl = get_ctrl(add_invar); |
| 428 | IdealLoopTree *add_invar_loop = get_loop(add_invar_ctrl ); |
| 429 | if( add_var_loop == n_loop ) { |
| 430 | } else if( add_invar_loop == n_loop ) { |
| 431 | // Swap to find the invariant part |
| 432 | add_invar = add_var; |
| 433 | add_invar_ctrl = add_var_ctrl; |
| 434 | add_invar_loop = add_var_loop; |
| 435 | add_var = add->in(2); |
| 436 | Node *add_var_ctrl = get_ctrl(add_var); |
| 437 | IdealLoopTree *add_var_loop = get_loop(add_var_ctrl ); |
| 438 | } else // Else neither input is loop invariant |
| 439 | return NULL__null; |
| 440 | if( n_loop == add_invar_loop || !add_invar_loop->is_member( n_loop ) ) |
| 441 | return NULL__null; // No invariant part of the add? |
| 442 | |
| 443 | // Yes! Reshape address expression! |
| 444 | Node *inv_scale = new LShiftINode( add_invar, scale ); |
| 445 | Node *inv_scale_ctrl = |
| 446 | dom_depth(add_invar_ctrl) > dom_depth(scale_ctrl) ? |
| 447 | add_invar_ctrl : scale_ctrl; |
| 448 | register_new_node( inv_scale, inv_scale_ctrl ); |
| 449 | Node *var_scale = new LShiftINode( add_var, scale ); |
| 450 | register_new_node( var_scale, n_ctrl ); |
| 451 | Node *var_add = new AddINode( var_scale, inv_scale ); |
| 452 | register_new_node( var_add, n_ctrl ); |
| 453 | _igvn.replace_node( n, var_add ); |
| 454 | return var_add; |
| 455 | } |
| 456 | |
| 457 | // Replace (I+V) with (V+I) |
| 458 | if( n_op == Op_AddI || |
| 459 | n_op == Op_AddL || |
| 460 | n_op == Op_AddF || |
| 461 | n_op == Op_AddD || |
| 462 | n_op == Op_MulI || |
| 463 | n_op == Op_MulL || |
| 464 | n_op == Op_MulF || |
| 465 | n_op == Op_MulD ) { |
| 466 | if( n2_loop == n_loop ) { |
| 467 | assert( n1_loop != n_loop, "" )do { if (!(n1_loop != n_loop)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 467, "assert(" "n1_loop != n_loop" ") failed", ""); ::breakpoint (); } } while (0); |
| 468 | n->swap_edges(1, 2); |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | // Replace ((I1 +p V) +p I2) with ((I1 +p I2) +p V), |
| 473 | // but not if I2 is a constant. |
| 474 | if( n_op == Op_AddP ) { |
| 475 | if( n2_loop == n_loop && n3_loop != n_loop ) { |
| 476 | if( n->in(2)->Opcode() == Op_AddP && !n->in(3)->is_Con() ) { |
| 477 | Node *n22_ctrl = get_ctrl(n->in(2)->in(2)); |
| 478 | Node *n23_ctrl = get_ctrl(n->in(2)->in(3)); |
| 479 | IdealLoopTree *n22loop = get_loop( n22_ctrl ); |
| 480 | IdealLoopTree *n23_loop = get_loop( n23_ctrl ); |
| 481 | if( n22loop != n_loop && n22loop->is_member(n_loop) && |
| 482 | n23_loop == n_loop ) { |
| 483 | Node *add1 = new AddPNode( n->in(1), n->in(2)->in(2), n->in(3) ); |
| 484 | // Stuff new AddP in the loop preheader |
| 485 | register_new_node( add1, n_loop->_head->in(LoopNode::EntryControl) ); |
| 486 | Node *add2 = new AddPNode( n->in(1), add1, n->in(2)->in(3) ); |
| 487 | register_new_node( add2, n_ctrl ); |
| 488 | _igvn.replace_node( n, add2 ); |
| 489 | return add2; |
| 490 | } |
| 491 | } |
| 492 | } |
| 493 | |
| 494 | // Replace (I1 +p (I2 + V)) with ((I1 +p I2) +p V) |
| 495 | if (n2_loop != n_loop && n3_loop == n_loop) { |
| 496 | if (n->in(3)->Opcode() == Op_AddXOp_AddL) { |
| 497 | Node *V = n->in(3)->in(1); |
| 498 | Node *I = n->in(3)->in(2); |
| 499 | if (is_member(n_loop,get_ctrl(V))) { |
| 500 | } else { |
| 501 | Node *tmp = V; V = I; I = tmp; |
| 502 | } |
| 503 | if (!is_member(n_loop,get_ctrl(I))) { |
| 504 | Node *add1 = new AddPNode(n->in(1), n->in(2), I); |
| 505 | // Stuff new AddP in the loop preheader |
| 506 | register_new_node(add1, n_loop->_head->in(LoopNode::EntryControl)); |
| 507 | Node *add2 = new AddPNode(n->in(1), add1, V); |
| 508 | register_new_node(add2, n_ctrl); |
| 509 | _igvn.replace_node(n, add2); |
| 510 | return add2; |
| 511 | } |
| 512 | } |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | return NULL__null; |
| 517 | } |
| 518 | |
| 519 | // Optimize ((in1[2*i] * in2[2*i]) + (in1[2*i+1] * in2[2*i+1])) |
| 520 | Node *PhaseIdealLoop::convert_add_to_muladd(Node* n) { |
| 521 | assert(n->Opcode() == Op_AddI, "sanity")do { if (!(n->Opcode() == Op_AddI)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 521, "assert(" "n->Opcode() == Op_AddI" ") failed", "sanity" ); ::breakpoint(); } } while (0); |
| 522 | Node * nn = NULL__null; |
| 523 | Node * in1 = n->in(1); |
| 524 | Node * in2 = n->in(2); |
| 525 | if (in1->Opcode() == Op_MulI && in2->Opcode() == Op_MulI) { |
| 526 | IdealLoopTree* loop_n = get_loop(get_ctrl(n)); |
| 527 | if (loop_n->is_counted() && |
| 528 | loop_n->_head->as_Loop()->is_valid_counted_loop(T_INT) && |
| 529 | Matcher::match_rule_supported(Op_MulAddVS2VI) && |
| 530 | Matcher::match_rule_supported(Op_MulAddS2I)) { |
| 531 | Node* mul_in1 = in1->in(1); |
| 532 | Node* mul_in2 = in1->in(2); |
| 533 | Node* mul_in3 = in2->in(1); |
| 534 | Node* mul_in4 = in2->in(2); |
| 535 | if (mul_in1->Opcode() == Op_LoadS && |
| 536 | mul_in2->Opcode() == Op_LoadS && |
| 537 | mul_in3->Opcode() == Op_LoadS && |
| 538 | mul_in4->Opcode() == Op_LoadS) { |
| 539 | IdealLoopTree* loop1 = get_loop(get_ctrl(mul_in1)); |
| 540 | IdealLoopTree* loop2 = get_loop(get_ctrl(mul_in2)); |
| 541 | IdealLoopTree* loop3 = get_loop(get_ctrl(mul_in3)); |
| 542 | IdealLoopTree* loop4 = get_loop(get_ctrl(mul_in4)); |
| 543 | IdealLoopTree* loop5 = get_loop(get_ctrl(in1)); |
| 544 | IdealLoopTree* loop6 = get_loop(get_ctrl(in2)); |
| 545 | // All nodes should be in the same counted loop. |
| 546 | if (loop_n == loop1 && loop_n == loop2 && loop_n == loop3 && |
| 547 | loop_n == loop4 && loop_n == loop5 && loop_n == loop6) { |
| 548 | Node* adr1 = mul_in1->in(MemNode::Address); |
| 549 | Node* adr2 = mul_in2->in(MemNode::Address); |
| 550 | Node* adr3 = mul_in3->in(MemNode::Address); |
| 551 | Node* adr4 = mul_in4->in(MemNode::Address); |
| 552 | if (adr1->is_AddP() && adr2->is_AddP() && adr3->is_AddP() && adr4->is_AddP()) { |
| 553 | if ((adr1->in(AddPNode::Base) == adr3->in(AddPNode::Base)) && |
| 554 | (adr2->in(AddPNode::Base) == adr4->in(AddPNode::Base))) { |
| 555 | nn = new MulAddS2INode(mul_in1, mul_in2, mul_in3, mul_in4); |
| 556 | register_new_node(nn, get_ctrl(n)); |
| 557 | _igvn.replace_node(n, nn); |
| 558 | return nn; |
| 559 | } else if ((adr1->in(AddPNode::Base) == adr4->in(AddPNode::Base)) && |
| 560 | (adr2->in(AddPNode::Base) == adr3->in(AddPNode::Base))) { |
| 561 | nn = new MulAddS2INode(mul_in1, mul_in2, mul_in4, mul_in3); |
| 562 | register_new_node(nn, get_ctrl(n)); |
| 563 | _igvn.replace_node(n, nn); |
| 564 | return nn; |
| 565 | } |
| 566 | } |
| 567 | } |
| 568 | } |
| 569 | } |
| 570 | } |
| 571 | return nn; |
| 572 | } |
| 573 | |
| 574 | //------------------------------conditional_move------------------------------- |
| 575 | // Attempt to replace a Phi with a conditional move. We have some pretty |
| 576 | // strict profitability requirements. All Phis at the merge point must |
| 577 | // be converted, so we can remove the control flow. We need to limit the |
| 578 | // number of c-moves to a small handful. All code that was in the side-arms |
| 579 | // of the CFG diamond is now speculatively executed. This code has to be |
| 580 | // "cheap enough". We are pretty much limited to CFG diamonds that merge |
| 581 | // 1 or 2 items with a total of 1 or 2 ops executed speculatively. |
| 582 | Node *PhaseIdealLoop::conditional_move( Node *region ) { |
| 583 | |
| 584 | assert(region->is_Region(), "sanity check")do { if (!(region->is_Region())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 584, "assert(" "region->is_Region()" ") failed", "sanity check" ); ::breakpoint(); } } while (0); |
| 585 | if (region->req() != 3) return NULL__null; |
| 586 | |
| 587 | // Check for CFG diamond |
| 588 | Node *lp = region->in(1); |
| 589 | Node *rp = region->in(2); |
| 590 | if (!lp || !rp) return NULL__null; |
| 591 | Node *lp_c = lp->in(0); |
| 592 | if (lp_c == NULL__null || lp_c != rp->in(0) || !lp_c->is_If()) return NULL__null; |
| 593 | IfNode *iff = lp_c->as_If(); |
| 594 | |
| 595 | // Check for ops pinned in an arm of the diamond. |
| 596 | // Can't remove the control flow in this case |
| 597 | if (lp->outcnt() > 1) return NULL__null; |
| 598 | if (rp->outcnt() > 1) return NULL__null; |
| 599 | |
| 600 | IdealLoopTree* r_loop = get_loop(region); |
| 601 | assert(r_loop == get_loop(iff), "sanity")do { if (!(r_loop == get_loop(iff))) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 601, "assert(" "r_loop == get_loop(iff)" ") failed", "sanity" ); ::breakpoint(); } } while (0); |
| 602 | // Always convert to CMOVE if all results are used only outside this loop. |
| 603 | bool used_inside_loop = (r_loop == _ltree_root); |
| 604 | |
| 605 | // Check profitability |
| 606 | int cost = 0; |
| 607 | int phis = 0; |
| 608 | for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
| 609 | Node *out = region->fast_out(i); |
| 610 | if (!out->is_Phi()) continue; // Ignore other control edges, etc |
| 611 | phis++; |
| 612 | PhiNode* phi = out->as_Phi(); |
| 613 | BasicType bt = phi->type()->basic_type(); |
| 614 | switch (bt) { |
| 615 | case T_DOUBLE: |
| 616 | case T_FLOAT: |
| 617 | if (C->use_cmove()) { |
| 618 | continue; //TODO: maybe we want to add some cost |
| 619 | } |
| 620 | cost += Matcher::float_cmove_cost(); // Could be very expensive |
| 621 | break; |
| 622 | case T_LONG: { |
| 623 | cost += Matcher::long_cmove_cost(); // May encodes as 2 CMOV's |
| 624 | } |
| 625 | case T_INT: // These all CMOV fine |
| 626 | case T_ADDRESS: { // (RawPtr) |
| 627 | cost++; |
| 628 | break; |
| 629 | } |
| 630 | case T_NARROWOOP: // Fall through |
| 631 | case T_OBJECT: { // Base oops are OK, but not derived oops |
| 632 | const TypeOopPtr *tp = phi->type()->make_ptr()->isa_oopptr(); |
| 633 | // Derived pointers are Bad (tm): what's the Base (for GC purposes) of a |
| 634 | // CMOVE'd derived pointer? It's a CMOVE'd derived base. Thus |
| 635 | // CMOVE'ing a derived pointer requires we also CMOVE the base. If we |
| 636 | // have a Phi for the base here that we convert to a CMOVE all is well |
| 637 | // and good. But if the base is dead, we'll not make a CMOVE. Later |
| 638 | // the allocator will have to produce a base by creating a CMOVE of the |
| 639 | // relevant bases. This puts the allocator in the business of |
| 640 | // manufacturing expensive instructions, generally a bad plan. |
| 641 | // Just Say No to Conditionally-Moved Derived Pointers. |
| 642 | if (tp && tp->offset() != 0) |
| 643 | return NULL__null; |
| 644 | cost++; |
| 645 | break; |
| 646 | } |
| 647 | default: |
| 648 | return NULL__null; // In particular, can't do memory or I/O |
| 649 | } |
| 650 | // Add in cost any speculative ops |
| 651 | for (uint j = 1; j < region->req(); j++) { |
| 652 | Node *proj = region->in(j); |
| 653 | Node *inp = phi->in(j); |
| 654 | if (get_ctrl(inp) == proj) { // Found local op |
| 655 | cost++; |
| 656 | // Check for a chain of dependent ops; these will all become |
| 657 | // speculative in a CMOV. |
| 658 | for (uint k = 1; k < inp->req(); k++) |
| 659 | if (get_ctrl(inp->in(k)) == proj) |
| 660 | cost += ConditionalMoveLimit; // Too much speculative goo |
| 661 | } |
| 662 | } |
| 663 | // See if the Phi is used by a Cmp or Narrow oop Decode/Encode. |
| 664 | // This will likely Split-If, a higher-payoff operation. |
| 665 | for (DUIterator_Fast kmax, k = phi->fast_outs(kmax); k < kmax; k++) { |
| 666 | Node* use = phi->fast_out(k); |
| 667 | if (use->is_Cmp() || use->is_DecodeNarrowPtr() || use->is_EncodeNarrowPtr()) |
| 668 | cost += ConditionalMoveLimit; |
| 669 | // Is there a use inside the loop? |
| 670 | // Note: check only basic types since CMoveP is pinned. |
| 671 | if (!used_inside_loop && is_java_primitive(bt)) { |
| 672 | IdealLoopTree* u_loop = get_loop(has_ctrl(use) ? get_ctrl(use) : use); |
| 673 | if (r_loop == u_loop || r_loop->is_member(u_loop)) { |
| 674 | used_inside_loop = true; |
| 675 | } |
| 676 | } |
| 677 | } |
| 678 | }//for |
| 679 | Node* bol = iff->in(1); |
| 680 | if (bol->Opcode() == Op_Opaque4) { |
| 681 | return NULL__null; // Ignore loop predicate checks (the Opaque4 ensures they will go away) |
| 682 | } |
| 683 | assert(bol->Opcode() == Op_Bool, "Unexpected node")do { if (!(bol->Opcode() == Op_Bool)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 683, "assert(" "bol->Opcode() == Op_Bool" ") failed", "Unexpected node" ); ::breakpoint(); } } while (0); |
| 684 | int cmp_op = bol->in(1)->Opcode(); |
| 685 | if (cmp_op == Op_SubTypeCheck) { // SubTypeCheck expansion expects an IfNode |
| 686 | return NULL__null; |
| 687 | } |
| 688 | // It is expensive to generate flags from a float compare. |
| 689 | // Avoid duplicated float compare. |
| 690 | if (phis > 1 && (cmp_op == Op_CmpF || cmp_op == Op_CmpD)) return NULL__null; |
| 691 | |
| 692 | float infrequent_prob = PROB_UNLIKELY_MAG(3)(1e-3f); |
| 693 | // Ignore cost and blocks frequency if CMOVE can be moved outside the loop. |
| 694 | if (used_inside_loop) { |
| 695 | if (cost >= ConditionalMoveLimit) return NULL__null; // Too much goo |
| 696 | |
| 697 | // BlockLayoutByFrequency optimization moves infrequent branch |
| 698 | // from hot path. No point in CMOV'ing in such case (110 is used |
| 699 | // instead of 100 to take into account not exactness of float value). |
| 700 | if (BlockLayoutByFrequency) { |
| 701 | infrequent_prob = MAX2(infrequent_prob, (float)BlockLayoutMinDiamondPercentage/110.0f); |
| 702 | } |
| 703 | } |
| 704 | // Check for highly predictable branch. No point in CMOV'ing if |
| 705 | // we are going to predict accurately all the time. |
| 706 | if (C->use_cmove() && (cmp_op == Op_CmpF || cmp_op == Op_CmpD)) { |
| 707 | //keep going |
| 708 | } else if (iff->_prob < infrequent_prob || |
| 709 | iff->_prob > (1.0f - infrequent_prob)) |
| 710 | return NULL__null; |
| 711 | |
| 712 | // -------------- |
| 713 | // Now replace all Phis with CMOV's |
| 714 | Node *cmov_ctrl = iff->in(0); |
| 715 | uint flip = (lp->Opcode() == Op_IfTrue); |
| 716 | Node_List wq; |
| 717 | while (1) { |
| 718 | PhiNode* phi = NULL__null; |
| 719 | for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
| 720 | Node *out = region->fast_out(i); |
| 721 | if (out->is_Phi()) { |
| 722 | phi = out->as_Phi(); |
| 723 | break; |
| 724 | } |
| 725 | } |
| 726 | if (phi == NULL__null || _igvn.type(phi) == Type::TOP) { |
| 727 | break; |
| 728 | } |
| 729 | if (PrintOpto && VerifyLoopOptimizations) { tty->print_cr("CMOV"); } |
| 730 | // Move speculative ops |
| 731 | wq.push(phi); |
| 732 | while (wq.size() > 0) { |
| 733 | Node *n = wq.pop(); |
| 734 | for (uint j = 1; j < n->req(); j++) { |
| 735 | Node* m = n->in(j); |
| 736 | if (m != NULL__null && !is_dominator(get_ctrl(m), cmov_ctrl)) { |
| 737 | #ifndef PRODUCT |
| 738 | if (PrintOpto && VerifyLoopOptimizations) { |
| 739 | tty->print(" speculate: "); |
| 740 | m->dump(); |
| 741 | } |
| 742 | #endif |
| 743 | set_ctrl(m, cmov_ctrl); |
| 744 | wq.push(m); |
| 745 | } |
| 746 | } |
| 747 | } |
| 748 | Node *cmov = CMoveNode::make(cmov_ctrl, iff->in(1), phi->in(1+flip), phi->in(2-flip), _igvn.type(phi)); |
| 749 | register_new_node( cmov, cmov_ctrl ); |
| 750 | _igvn.replace_node( phi, cmov ); |
| 751 | #ifndef PRODUCT |
| 752 | if (TraceLoopOpts) { |
| 753 | tty->print("CMOV "); |
| 754 | r_loop->dump_head(); |
| 755 | if (Verbose) { |
| 756 | bol->in(1)->dump(1); |
| 757 | cmov->dump(1); |
| 758 | } |
| 759 | } |
| 760 | if (VerifyLoopOptimizations) verify(); |
| 761 | #endif |
| 762 | } |
| 763 | |
| 764 | // The useless CFG diamond will fold up later; see the optimization in |
| 765 | // RegionNode::Ideal. |
| 766 | _igvn._worklist.push(region); |
| 767 | |
| 768 | return iff->in(1); |
| 769 | } |
| 770 | |
| 771 | static void enqueue_cfg_uses(Node* m, Unique_Node_List& wq) { |
| 772 | for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax; i++) { |
| 773 | Node* u = m->fast_out(i); |
| 774 | if (u->is_CFG()) { |
| 775 | if (u->Opcode() == Op_NeverBranch) { |
| 776 | u = ((NeverBranchNode*)u)->proj_out(0); |
| 777 | enqueue_cfg_uses(u, wq); |
| 778 | } else { |
| 779 | wq.push(u); |
| 780 | } |
| 781 | } |
| 782 | } |
| 783 | } |
| 784 | |
| 785 | // Try moving a store out of a loop, right before the loop |
| 786 | Node* PhaseIdealLoop::try_move_store_before_loop(Node* n, Node *n_ctrl) { |
| 787 | // Store has to be first in the loop body |
| 788 | IdealLoopTree *n_loop = get_loop(n_ctrl); |
| 789 | if (n->is_Store() && n_loop != _ltree_root && |
| 790 | n_loop->is_loop() && n_loop->_head->is_Loop() && |
| 791 | n->in(0) != NULL__null) { |
| 792 | Node* address = n->in(MemNode::Address); |
| 793 | Node* value = n->in(MemNode::ValueIn); |
| 794 | Node* mem = n->in(MemNode::Memory); |
| 795 | IdealLoopTree* address_loop = get_loop(get_ctrl(address)); |
| 796 | IdealLoopTree* value_loop = get_loop(get_ctrl(value)); |
| 797 | |
| 798 | // - address and value must be loop invariant |
| 799 | // - memory must be a memory Phi for the loop |
| 800 | // - Store must be the only store on this memory slice in the |
| 801 | // loop: if there's another store following this one then value |
| 802 | // written at iteration i by the second store could be overwritten |
| 803 | // at iteration i+n by the first store: it's not safe to move the |
| 804 | // first store out of the loop |
| 805 | // - nothing must observe the memory Phi: it guarantees no read |
| 806 | // before the store, we are also guaranteed the store post |
| 807 | // dominates the loop head (ignoring a possible early |
| 808 | // exit). Otherwise there would be extra Phi involved between the |
| 809 | // loop's Phi and the store. |
| 810 | // - there must be no early exit from the loop before the Store |
| 811 | // (such an exit most of the time would be an extra use of the |
| 812 | // memory Phi but sometimes is a bottom memory Phi that takes the |
| 813 | // store as input). |
| 814 | |
| 815 | if (!n_loop->is_member(address_loop) && |
| 816 | !n_loop->is_member(value_loop) && |
| 817 | mem->is_Phi() && mem->in(0) == n_loop->_head && |
| 818 | mem->outcnt() == 1 && |
| 819 | mem->in(LoopNode::LoopBackControl) == n) { |
| 820 | |
| 821 | assert(n_loop->_tail != NULL, "need a tail")do { if (!(n_loop->_tail != __null)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 821, "assert(" "n_loop->_tail != __null" ") failed", "need a tail" ); ::breakpoint(); } } while (0); |
| 822 | assert(is_dominator(n_ctrl, n_loop->_tail), "store control must not be in a branch in the loop")do { if (!(is_dominator(n_ctrl, n_loop->_tail))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 822, "assert(" "is_dominator(n_ctrl, n_loop->_tail)" ") failed" , "store control must not be in a branch in the loop"); ::breakpoint (); } } while (0); |
| 823 | |
| 824 | // Verify that there's no early exit of the loop before the store. |
| 825 | bool ctrl_ok = false; |
| 826 | { |
| 827 | // Follow control from loop head until n, we exit the loop or |
| 828 | // we reach the tail |
| 829 | ResourceMark rm; |
| 830 | Unique_Node_List wq; |
| 831 | wq.push(n_loop->_head); |
| 832 | |
| 833 | for (uint next = 0; next < wq.size(); ++next) { |
| 834 | Node *m = wq.at(next); |
| 835 | if (m == n->in(0)) { |
| 836 | ctrl_ok = true; |
| 837 | continue; |
| 838 | } |
| 839 | assert(!has_ctrl(m), "should be CFG")do { if (!(!has_ctrl(m))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 839, "assert(" "!has_ctrl(m)" ") failed", "should be CFG"); ::breakpoint(); } } while (0); |
| 840 | if (!n_loop->is_member(get_loop(m)) || m == n_loop->_tail) { |
| 841 | ctrl_ok = false; |
| 842 | break; |
| 843 | } |
| 844 | enqueue_cfg_uses(m, wq); |
| 845 | if (wq.size() > 10) { |
| 846 | ctrl_ok = false; |
| 847 | break; |
| 848 | } |
| 849 | } |
| 850 | } |
| 851 | if (ctrl_ok) { |
| 852 | // move the Store |
| 853 | _igvn.replace_input_of(mem, LoopNode::LoopBackControl, mem); |
| 854 | _igvn.replace_input_of(n, 0, n_loop->_head->as_Loop()->skip_strip_mined()->in(LoopNode::EntryControl)); |
| 855 | _igvn.replace_input_of(n, MemNode::Memory, mem->in(LoopNode::EntryControl)); |
| 856 | // Disconnect the phi now. An empty phi can confuse other |
| 857 | // optimizations in this pass of loop opts. |
| 858 | _igvn.replace_node(mem, mem->in(LoopNode::EntryControl)); |
| 859 | n_loop->_body.yank(mem); |
| 860 | |
| 861 | set_ctrl_and_loop(n, n->in(0)); |
| 862 | |
| 863 | return n; |
| 864 | } |
| 865 | } |
| 866 | } |
| 867 | return NULL__null; |
| 868 | } |
| 869 | |
| 870 | // Try moving a store out of a loop, right after the loop |
| 871 | void PhaseIdealLoop::try_move_store_after_loop(Node* n) { |
| 872 | if (n->is_Store() && n->in(0) != NULL__null) { |
| 873 | Node *n_ctrl = get_ctrl(n); |
| 874 | IdealLoopTree *n_loop = get_loop(n_ctrl); |
| 875 | // Store must be in a loop |
| 876 | if (n_loop != _ltree_root && !n_loop->_irreducible) { |
| 877 | Node* address = n->in(MemNode::Address); |
| 878 | Node* value = n->in(MemNode::ValueIn); |
| 879 | IdealLoopTree* address_loop = get_loop(get_ctrl(address)); |
| 880 | // address must be loop invariant |
| 881 | if (!n_loop->is_member(address_loop)) { |
| 882 | // Store must be last on this memory slice in the loop and |
| 883 | // nothing in the loop must observe it |
| 884 | Node* phi = NULL__null; |
| 885 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
| 886 | Node* u = n->fast_out(i); |
| 887 | if (has_ctrl(u)) { // control use? |
| 888 | IdealLoopTree *u_loop = get_loop(get_ctrl(u)); |
| 889 | if (!n_loop->is_member(u_loop)) { |
| 890 | continue; |
| 891 | } |
| 892 | if (u->is_Phi() && u->in(0) == n_loop->_head) { |
| 893 | assert(_igvn.type(u) == Type::MEMORY, "bad phi")do { if (!(_igvn.type(u) == Type::MEMORY)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 893, "assert(" "_igvn.type(u) == Type::MEMORY" ") failed", "bad phi" ); ::breakpoint(); } } while (0); |
| 894 | // multiple phis on the same slice are possible |
| 895 | if (phi != NULL__null) { |
| 896 | return; |
| 897 | } |
| 898 | phi = u; |
| 899 | continue; |
| 900 | } |
| 901 | } |
| 902 | return; |
| 903 | } |
| 904 | if (phi != NULL__null) { |
| 905 | // Nothing in the loop before the store (next iteration) |
| 906 | // must observe the stored value |
| 907 | bool mem_ok = true; |
| 908 | { |
| 909 | ResourceMark rm; |
| 910 | Unique_Node_List wq; |
| 911 | wq.push(phi); |
| 912 | for (uint next = 0; next < wq.size() && mem_ok; ++next) { |
| 913 | Node *m = wq.at(next); |
| 914 | for (DUIterator_Fast imax, i = m->fast_outs(imax); i < imax && mem_ok; i++) { |
| 915 | Node* u = m->fast_out(i); |
| 916 | if (u->is_Store() || u->is_Phi()) { |
| 917 | if (u != n) { |
| 918 | wq.push(u); |
| 919 | mem_ok = (wq.size() <= 10); |
| 920 | } |
| 921 | } else { |
| 922 | mem_ok = false; |
| 923 | break; |
| 924 | } |
| 925 | } |
| 926 | } |
| 927 | } |
| 928 | if (mem_ok) { |
| 929 | // Move the store out of the loop if the LCA of all |
| 930 | // users (except for the phi) is outside the loop. |
| 931 | Node* hook = new Node(1); |
| 932 | hook->init_req(0, n_ctrl); // Add an input to prevent hook from being dead |
| 933 | _igvn.rehash_node_delayed(phi); |
| 934 | int count = phi->replace_edge(n, hook, &_igvn); |
| 935 | assert(count > 0, "inconsistent phi")do { if (!(count > 0)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 935, "assert(" "count > 0" ") failed", "inconsistent phi" ); ::breakpoint(); } } while (0); |
| 936 | |
| 937 | // Compute latest point this store can go |
| 938 | Node* lca = get_late_ctrl(n, get_ctrl(n)); |
| 939 | if (lca->is_OuterStripMinedLoop()) { |
| 940 | lca = lca->in(LoopNode::EntryControl); |
| 941 | } |
| 942 | if (n_loop->is_member(get_loop(lca))) { |
| 943 | // LCA is in the loop - bail out |
| 944 | _igvn.replace_node(hook, n); |
| 945 | return; |
| 946 | } |
| 947 | #ifdef ASSERT1 |
| 948 | if (n_loop->_head->is_Loop() && n_loop->_head->as_Loop()->is_strip_mined()) { |
| 949 | assert(n_loop->_head->Opcode() == Op_CountedLoop, "outer loop is a strip mined")do { if (!(n_loop->_head->Opcode() == Op_CountedLoop)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 949, "assert(" "n_loop->_head->Opcode() == Op_CountedLoop" ") failed", "outer loop is a strip mined"); ::breakpoint(); } } while (0); |
| 950 | n_loop->_head->as_Loop()->verify_strip_mined(1); |
| 951 | Node* outer = n_loop->_head->as_CountedLoop()->outer_loop(); |
| 952 | IdealLoopTree* outer_loop = get_loop(outer); |
| 953 | assert(n_loop->_parent == outer_loop, "broken loop tree")do { if (!(n_loop->_parent == outer_loop)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 953, "assert(" "n_loop->_parent == outer_loop" ") failed" , "broken loop tree"); ::breakpoint(); } } while (0); |
| 954 | assert(get_loop(lca) == outer_loop, "safepoint in outer loop consume all memory state")do { if (!(get_loop(lca) == outer_loop)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 954, "assert(" "get_loop(lca) == outer_loop" ") failed", "safepoint in outer loop consume all memory state" ); ::breakpoint(); } } while (0); |
| 955 | } |
| 956 | #endif |
| 957 | lca = place_outside_loop(lca, n_loop); |
| 958 | assert(!n_loop->is_member(get_loop(lca)), "control must not be back in the loop")do { if (!(!n_loop->is_member(get_loop(lca)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 958, "assert(" "!n_loop->is_member(get_loop(lca))" ") failed" , "control must not be back in the loop"); ::breakpoint(); } } while (0); |
| 959 | assert(get_loop(lca)->_nest < n_loop->_nest || lca->in(0)->Opcode() == Op_NeverBranch, "must not be moved into inner loop")do { if (!(get_loop(lca)->_nest < n_loop->_nest || lca ->in(0)->Opcode() == Op_NeverBranch)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 959, "assert(" "get_loop(lca)->_nest < n_loop->_nest || lca->in(0)->Opcode() == Op_NeverBranch" ") failed", "must not be moved into inner loop"); ::breakpoint (); } } while (0); |
| 960 | |
| 961 | // Move store out of the loop |
| 962 | _igvn.replace_node(hook, n->in(MemNode::Memory)); |
| 963 | _igvn.replace_input_of(n, 0, lca); |
| 964 | set_ctrl_and_loop(n, lca); |
| 965 | |
| 966 | // Disconnect the phi now. An empty phi can confuse other |
| 967 | // optimizations in this pass of loop opts.. |
| 968 | if (phi->in(LoopNode::LoopBackControl) == phi) { |
| 969 | _igvn.replace_node(phi, phi->in(LoopNode::EntryControl)); |
| 970 | n_loop->_body.yank(phi); |
| 971 | } |
| 972 | } |
| 973 | } |
| 974 | } |
| 975 | } |
| 976 | } |
| 977 | } |
| 978 | |
| 979 | //------------------------------split_if_with_blocks_pre----------------------- |
| 980 | // Do the real work in a non-recursive function. Data nodes want to be |
| 981 | // cloned in the pre-order so they can feed each other nicely. |
| 982 | Node *PhaseIdealLoop::split_if_with_blocks_pre( Node *n ) { |
| 983 | // Cloning these guys is unlikely to win |
| 984 | int n_op = n->Opcode(); |
| 985 | if (n_op == Op_MergeMem) { |
| 986 | return n; |
| 987 | } |
| 988 | if (n->is_Proj()) { |
| 989 | return n; |
| 990 | } |
| 991 | // Do not clone-up CmpFXXX variations, as these are always |
| 992 | // followed by a CmpI |
| 993 | if (n->is_Cmp()) { |
| 994 | return n; |
| 995 | } |
| 996 | // Attempt to use a conditional move instead of a phi/branch |
| 997 | if (ConditionalMoveLimit > 0 && n_op == Op_Region) { |
| 998 | Node *cmov = conditional_move( n ); |
| 999 | if (cmov) { |
| 1000 | return cmov; |
| 1001 | } |
| 1002 | } |
| 1003 | if (n->is_CFG() || n->is_LoadStore()) { |
| 1004 | return n; |
| 1005 | } |
| 1006 | if (n->is_Opaque1() || // Opaque nodes cannot be mod'd |
| 1007 | n_op == Op_Opaque2) { |
| 1008 | if (!C->major_progress()) { // If chance of no more loop opts... |
| 1009 | _igvn._worklist.push(n); // maybe we'll remove them |
| 1010 | } |
| 1011 | return n; |
| 1012 | } |
| 1013 | |
| 1014 | if (n->is_Con()) { |
| 1015 | return n; // No cloning for Con nodes |
| 1016 | } |
| 1017 | |
| 1018 | Node *n_ctrl = get_ctrl(n); |
| 1019 | if (!n_ctrl) { |
| 1020 | return n; // Dead node |
| 1021 | } |
| 1022 | |
| 1023 | Node* res = try_move_store_before_loop(n, n_ctrl); |
| 1024 | if (res != NULL__null) { |
| 1025 | return n; |
| 1026 | } |
| 1027 | |
| 1028 | // Attempt to remix address expressions for loop invariants |
| 1029 | Node *m = remix_address_expressions( n ); |
| 1030 | if( m ) return m; |
| 1031 | |
| 1032 | if (n_op == Op_AddI) { |
| 1033 | Node *nn = convert_add_to_muladd( n ); |
| 1034 | if ( nn ) return nn; |
| 1035 | } |
| 1036 | |
| 1037 | if (n->is_ConstraintCast()) { |
| 1038 | Node* dom_cast = n->as_ConstraintCast()->dominating_cast(&_igvn, this); |
| 1039 | // ConstraintCastNode::dominating_cast() uses node control input to determine domination. |
| 1040 | // Node control inputs don't necessarily agree with loop control info (due to |
| 1041 | // transformations happened in between), thus additional dominance check is needed |
| 1042 | // to keep loop info valid. |
| 1043 | if (dom_cast != NULL__null && is_dominator(get_ctrl(dom_cast), get_ctrl(n))) { |
| 1044 | _igvn.replace_node(n, dom_cast); |
| 1045 | return dom_cast; |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | // Determine if the Node has inputs from some local Phi. |
| 1050 | // Returns the block to clone thru. |
| 1051 | Node *n_blk = has_local_phi_input( n ); |
| 1052 | if( !n_blk ) return n; |
| 1053 | |
| 1054 | // Do not clone the trip counter through on a CountedLoop |
| 1055 | // (messes up the canonical shape). |
| 1056 | if (((n_blk->is_CountedLoop() || (n_blk->is_Loop() && n_blk->as_Loop()->is_loop_nest_inner_loop())) && n->Opcode() == Op_AddI) || |
| 1057 | (n_blk->is_LongCountedLoop() && n->Opcode() == Op_AddL)) { |
| 1058 | return n; |
| 1059 | } |
| 1060 | |
| 1061 | // Check for having no control input; not pinned. Allow |
| 1062 | // dominating control. |
| 1063 | if (n->in(0)) { |
| 1064 | Node *dom = idom(n_blk); |
| 1065 | if (dom_lca(n->in(0), dom) != n->in(0)) { |
| 1066 | return n; |
| 1067 | } |
| 1068 | } |
| 1069 | // Policy: when is it profitable. You must get more wins than |
| 1070 | // policy before it is considered profitable. Policy is usually 0, |
| 1071 | // so 1 win is considered profitable. Big merges will require big |
| 1072 | // cloning, so get a larger policy. |
| 1073 | int policy = n_blk->req() >> 2; |
| 1074 | |
| 1075 | // If the loop is a candidate for range check elimination, |
| 1076 | // delay splitting through it's phi until a later loop optimization |
| 1077 | if (n_blk->is_BaseCountedLoop()) { |
| 1078 | IdealLoopTree *lp = get_loop(n_blk); |
| 1079 | if (lp && lp->_rce_candidate) { |
| 1080 | return n; |
| 1081 | } |
| 1082 | } |
| 1083 | |
| 1084 | if (must_throttle_split_if()) return n; |
| 1085 | |
| 1086 | // Split 'n' through the merge point if it is profitable |
| 1087 | Node *phi = split_thru_phi( n, n_blk, policy ); |
| 1088 | if (!phi) return n; |
| 1089 | |
| 1090 | // Found a Phi to split thru! |
| 1091 | // Replace 'n' with the new phi |
| 1092 | _igvn.replace_node( n, phi ); |
| 1093 | // Moved a load around the loop, 'en-registering' something. |
| 1094 | if (n_blk->is_Loop() && n->is_Load() && |
| 1095 | !phi->in(LoopNode::LoopBackControl)->is_Load()) |
| 1096 | C->set_major_progress(); |
| 1097 | |
| 1098 | return phi; |
| 1099 | } |
| 1100 | |
| 1101 | static bool merge_point_too_heavy(Compile* C, Node* region) { |
| 1102 | // Bail out if the region and its phis have too many users. |
| 1103 | int weight = 0; |
| 1104 | for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
| 1105 | weight += region->fast_out(i)->outcnt(); |
| 1106 | } |
| 1107 | int nodes_left = C->max_node_limit() - C->live_nodes(); |
| 1108 | if (weight * 8 > nodes_left) { |
| 1109 | if (PrintOpto) { |
| 1110 | tty->print_cr("*** Split-if bails out: %d nodes, region weight %d", C->unique(), weight); |
| 1111 | } |
| 1112 | return true; |
| 1113 | } else { |
| 1114 | return false; |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | static bool merge_point_safe(Node* region) { |
| 1119 | // 4799512: Stop split_if_with_blocks from splitting a block with a ConvI2LNode |
| 1120 | // having a PhiNode input. This sidesteps the dangerous case where the split |
| 1121 | // ConvI2LNode may become TOP if the input Value() does not |
| 1122 | // overlap the ConvI2L range, leaving a node which may not dominate its |
| 1123 | // uses. |
| 1124 | // A better fix for this problem can be found in the BugTraq entry, but |
| 1125 | // expediency for Mantis demands this hack. |
| 1126 | #ifdef _LP641 |
| 1127 | for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) { |
| 1128 | Node* n = region->fast_out(i); |
| 1129 | if (n->is_Phi()) { |
| 1130 | for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
| 1131 | Node* m = n->fast_out(j); |
| 1132 | if (m->Opcode() == Op_ConvI2L) |
| 1133 | return false; |
| 1134 | if (m->is_CastII()) { |
| 1135 | return false; |
| 1136 | } |
| 1137 | } |
| 1138 | } |
| 1139 | } |
| 1140 | #endif |
| 1141 | return true; |
| 1142 | } |
| 1143 | |
| 1144 | |
| 1145 | //------------------------------place_outside_loop--------------------------------- |
| 1146 | // Place some computation outside of this loop on the path to the use passed as argument |
| 1147 | Node* PhaseIdealLoop::place_outside_loop(Node* useblock, IdealLoopTree* loop) const { |
| 1148 | Node* head = loop->_head; |
| 1149 | assert(!loop->is_member(get_loop(useblock)), "must be outside loop")do { if (!(!loop->is_member(get_loop(useblock)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1149, "assert(" "!loop->is_member(get_loop(useblock))" ") failed" , "must be outside loop"); ::breakpoint(); } } while (0); |
| 1150 | if (head->is_Loop() && head->as_Loop()->is_strip_mined()) { |
| 1151 | loop = loop->_parent; |
| 1152 | assert(loop->_head->is_OuterStripMinedLoop(), "malformed strip mined loop")do { if (!(loop->_head->is_OuterStripMinedLoop())) { (* g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1152, "assert(" "loop->_head->is_OuterStripMinedLoop()" ") failed", "malformed strip mined loop"); ::breakpoint(); } } while (0); |
| 1153 | } |
| 1154 | |
| 1155 | // Pick control right outside the loop |
| 1156 | for (;;) { |
| 1157 | Node* dom = idom(useblock); |
| 1158 | if (loop->is_member(get_loop(dom)) || |
| 1159 | // NeverBranch nodes are not assigned to the loop when constructed |
| 1160 | (dom->Opcode() == Op_NeverBranch && loop->is_member(get_loop(dom->in(0))))) { |
| 1161 | break; |
| 1162 | } |
| 1163 | useblock = dom; |
| 1164 | } |
| 1165 | assert(find_non_split_ctrl(useblock) == useblock, "should be non split control")do { if (!(find_non_split_ctrl(useblock) == useblock)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1165, "assert(" "find_non_split_ctrl(useblock) == useblock" ") failed", "should be non split control"); ::breakpoint(); } } while (0); |
| 1166 | return useblock; |
| 1167 | } |
| 1168 | |
| 1169 | |
| 1170 | bool PhaseIdealLoop::identical_backtoback_ifs(Node *n) { |
| 1171 | if (!n->is_If() || n->is_BaseCountedLoopEnd()) { |
| 1172 | return false; |
| 1173 | } |
| 1174 | if (!n->in(0)->is_Region()) { |
| 1175 | return false; |
| 1176 | } |
| 1177 | |
| 1178 | IfNode* n_if = n->as_If(); |
| 1179 | if (n_if->proj_out(0)->outcnt() > 1 || n_if->proj_out(1)->outcnt() > 1) { |
| 1180 | // Removing the dominated If node by using the split-if optimization does not work if there are data dependencies. |
| 1181 | // Some data dependencies depend on its immediate dominator If node and should not be separated from it (e.g. null |
| 1182 | // checks, division by zero checks etc.). Bail out for now until data dependencies are correctly handled when |
| 1183 | // optimizing back-to-back ifs. |
| 1184 | return false; |
| 1185 | } |
| 1186 | |
| 1187 | Node* region = n->in(0); |
| 1188 | Node* dom = idom(region); |
| 1189 | if (!dom->is_If() || dom->in(1) != n->in(1)) { |
| 1190 | return false; |
| 1191 | } |
| 1192 | IfNode* dom_if = dom->as_If(); |
| 1193 | Node* proj_true = dom_if->proj_out(1); |
| 1194 | Node* proj_false = dom_if->proj_out(0); |
| 1195 | |
| 1196 | for (uint i = 1; i < region->req(); i++) { |
| 1197 | if (is_dominator(proj_true, region->in(i))) { |
| 1198 | continue; |
| 1199 | } |
| 1200 | if (is_dominator(proj_false, region->in(i))) { |
| 1201 | continue; |
| 1202 | } |
| 1203 | return false; |
| 1204 | } |
| 1205 | |
| 1206 | return true; |
| 1207 | } |
| 1208 | |
| 1209 | |
| 1210 | bool PhaseIdealLoop::can_split_if(Node* n_ctrl) { |
| 1211 | if (must_throttle_split_if()) { |
| 1212 | return false; |
| 1213 | } |
| 1214 | |
| 1215 | // Do not do 'split-if' if irreducible loops are present. |
| 1216 | if (_has_irreducible_loops) { |
| 1217 | return false; |
| 1218 | } |
| 1219 | |
| 1220 | if (merge_point_too_heavy(C, n_ctrl)) { |
| 1221 | return false; |
| 1222 | } |
| 1223 | |
| 1224 | // Do not do 'split-if' if some paths are dead. First do dead code |
| 1225 | // elimination and then see if its still profitable. |
| 1226 | for (uint i = 1; i < n_ctrl->req(); i++) { |
| 1227 | if (n_ctrl->in(i) == C->top()) { |
| 1228 | return false; |
| 1229 | } |
| 1230 | } |
| 1231 | |
| 1232 | // If trying to do a 'Split-If' at the loop head, it is only |
| 1233 | // profitable if the cmp folds up on BOTH paths. Otherwise we |
| 1234 | // risk peeling a loop forever. |
| 1235 | |
| 1236 | // CNC - Disabled for now. Requires careful handling of loop |
| 1237 | // body selection for the cloned code. Also, make sure we check |
| 1238 | // for any input path not being in the same loop as n_ctrl. For |
| 1239 | // irreducible loops we cannot check for 'n_ctrl->is_Loop()' |
| 1240 | // because the alternative loop entry points won't be converted |
| 1241 | // into LoopNodes. |
| 1242 | IdealLoopTree *n_loop = get_loop(n_ctrl); |
| 1243 | for (uint j = 1; j < n_ctrl->req(); j++) { |
| 1244 | if (get_loop(n_ctrl->in(j)) != n_loop) { |
| 1245 | return false; |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | // Check for safety of the merge point. |
| 1250 | if (!merge_point_safe(n_ctrl)) { |
| 1251 | return false; |
| 1252 | } |
| 1253 | |
| 1254 | return true; |
| 1255 | } |
| 1256 | |
| 1257 | // Detect if the node is the inner strip-mined loop |
| 1258 | // Return: NULL if it's not the case, or the exit of outer strip-mined loop |
| 1259 | static Node* is_inner_of_stripmined_loop(const Node* out) { |
| 1260 | Node* out_le = NULL__null; |
| 1261 | |
| 1262 | if (out->is_CountedLoopEnd()) { |
| 1263 | const CountedLoopNode* loop = out->as_CountedLoopEnd()->loopnode(); |
| 1264 | |
| 1265 | if (loop != NULL__null && loop->is_strip_mined()) { |
| 1266 | out_le = loop->in(LoopNode::EntryControl)->as_OuterStripMinedLoop()->outer_loop_exit(); |
| 1267 | } |
| 1268 | } |
| 1269 | |
| 1270 | return out_le; |
| 1271 | } |
| 1272 | |
| 1273 | //------------------------------split_if_with_blocks_post---------------------- |
| 1274 | // Do the real work in a non-recursive function. CFG hackery wants to be |
| 1275 | // in the post-order, so it can dirty the I-DOM info and not use the dirtied |
| 1276 | // info. |
| 1277 | void PhaseIdealLoop::split_if_with_blocks_post(Node *n) { |
| 1278 | |
| 1279 | // Cloning Cmp through Phi's involves the split-if transform. |
| 1280 | // FastLock is not used by an If |
| 1281 | if (n->is_Cmp() && !n->is_FastLock()) { |
| 1282 | Node *n_ctrl = get_ctrl(n); |
| 1283 | // Determine if the Node has inputs from some local Phi. |
| 1284 | // Returns the block to clone thru. |
| 1285 | Node *n_blk = has_local_phi_input(n); |
| 1286 | if (n_blk != n_ctrl) { |
| 1287 | return; |
| 1288 | } |
| 1289 | |
| 1290 | if (!can_split_if(n_ctrl)) { |
| 1291 | return; |
| 1292 | } |
| 1293 | |
| 1294 | if (n->outcnt() != 1) { |
| 1295 | return; // Multiple bool's from 1 compare? |
| 1296 | } |
| 1297 | Node *bol = n->unique_out(); |
| 1298 | assert(bol->is_Bool(), "expect a bool here")do { if (!(bol->is_Bool())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1298, "assert(" "bol->is_Bool()" ") failed", "expect a bool here" ); ::breakpoint(); } } while (0); |
| 1299 | if (bol->outcnt() != 1) { |
| 1300 | return;// Multiple branches from 1 compare? |
| 1301 | } |
| 1302 | Node *iff = bol->unique_out(); |
| 1303 | |
| 1304 | // Check some safety conditions |
| 1305 | if (iff->is_If()) { // Classic split-if? |
| 1306 | if (iff->in(0) != n_ctrl) { |
| 1307 | return; // Compare must be in same blk as if |
| 1308 | } |
| 1309 | } else if (iff->is_CMove()) { // Trying to split-up a CMOVE |
| 1310 | // Can't split CMove with different control edge. |
| 1311 | if (iff->in(0) != NULL__null && iff->in(0) != n_ctrl ) { |
| 1312 | return; |
| 1313 | } |
| 1314 | if (get_ctrl(iff->in(2)) == n_ctrl || |
| 1315 | get_ctrl(iff->in(3)) == n_ctrl) { |
| 1316 | return; // Inputs not yet split-up |
| 1317 | } |
| 1318 | if (get_loop(n_ctrl) != get_loop(get_ctrl(iff))) { |
| 1319 | return; // Loop-invar test gates loop-varying CMOVE |
| 1320 | } |
| 1321 | } else { |
| 1322 | return; // some other kind of node, such as an Allocate |
| 1323 | } |
| 1324 | |
| 1325 | // When is split-if profitable? Every 'win' on means some control flow |
| 1326 | // goes dead, so it's almost always a win. |
| 1327 | int policy = 0; |
| 1328 | // Split compare 'n' through the merge point if it is profitable |
| 1329 | Node *phi = split_thru_phi( n, n_ctrl, policy); |
| 1330 | if (!phi) { |
| 1331 | return; |
| 1332 | } |
| 1333 | |
| 1334 | // Found a Phi to split thru! |
| 1335 | // Replace 'n' with the new phi |
| 1336 | _igvn.replace_node(n, phi); |
| 1337 | |
| 1338 | // Now split the bool up thru the phi |
| 1339 | Node *bolphi = split_thru_phi(bol, n_ctrl, -1); |
| 1340 | guarantee(bolphi != NULL, "null boolean phi node")do { if (!(bolphi != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1340, "guarantee(" "bolphi != NULL" ") failed", "null boolean phi node" ); ::breakpoint(); } } while (0); |
| 1341 | |
| 1342 | _igvn.replace_node(bol, bolphi); |
| 1343 | assert(iff->in(1) == bolphi, "")do { if (!(iff->in(1) == bolphi)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1343, "assert(" "iff->in(1) == bolphi" ") failed", ""); :: breakpoint(); } } while (0); |
| 1344 | |
| 1345 | if (bolphi->Value(&_igvn)->singleton()) { |
| 1346 | return; |
| 1347 | } |
| 1348 | |
| 1349 | // Conditional-move? Must split up now |
| 1350 | if (!iff->is_If()) { |
| 1351 | Node *cmovphi = split_thru_phi(iff, n_ctrl, -1); |
| 1352 | _igvn.replace_node(iff, cmovphi); |
| 1353 | return; |
| 1354 | } |
| 1355 | |
| 1356 | // Now split the IF |
| 1357 | do_split_if(iff); |
| 1358 | return; |
| 1359 | } |
| 1360 | |
| 1361 | // Two identical ifs back to back can be merged |
| 1362 | if (identical_backtoback_ifs(n) && can_split_if(n->in(0))) { |
| 1363 | Node *n_ctrl = n->in(0); |
| 1364 | PhiNode* bolphi = PhiNode::make_blank(n_ctrl, n->in(1)); |
| 1365 | IfNode* dom_if = idom(n_ctrl)->as_If(); |
| 1366 | Node* proj_true = dom_if->proj_out(1); |
| 1367 | Node* proj_false = dom_if->proj_out(0); |
| 1368 | Node* con_true = _igvn.makecon(TypeInt::ONE); |
| 1369 | Node* con_false = _igvn.makecon(TypeInt::ZERO); |
| 1370 | |
| 1371 | for (uint i = 1; i < n_ctrl->req(); i++) { |
| 1372 | if (is_dominator(proj_true, n_ctrl->in(i))) { |
| 1373 | bolphi->init_req(i, con_true); |
| 1374 | } else { |
| 1375 | assert(is_dominator(proj_false, n_ctrl->in(i)), "bad if")do { if (!(is_dominator(proj_false, n_ctrl->in(i)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1375, "assert(" "is_dominator(proj_false, n_ctrl->in(i))" ") failed", "bad if"); ::breakpoint(); } } while (0); |
| 1376 | bolphi->init_req(i, con_false); |
| 1377 | } |
| 1378 | } |
| 1379 | register_new_node(bolphi, n_ctrl); |
| 1380 | _igvn.replace_input_of(n, 1, bolphi); |
| 1381 | |
| 1382 | // Now split the IF |
| 1383 | do_split_if(n); |
| 1384 | return; |
| 1385 | } |
| 1386 | |
| 1387 | // Check for an IF ready to split; one that has its |
| 1388 | // condition codes input coming from a Phi at the block start. |
| 1389 | int n_op = n->Opcode(); |
| 1390 | |
| 1391 | // Check for an IF being dominated by another IF same test |
| 1392 | if (n_op == Op_If || |
| 1393 | n_op == Op_RangeCheck) { |
| 1394 | Node *bol = n->in(1); |
| 1395 | uint max = bol->outcnt(); |
| 1396 | // Check for same test used more than once? |
| 1397 | if (max > 1 && bol->is_Bool()) { |
| 1398 | // Search up IDOMs to see if this IF is dominated. |
| 1399 | Node *cutoff = get_ctrl(bol); |
| 1400 | |
| 1401 | // Now search up IDOMs till cutoff, looking for a dominating test |
| 1402 | Node *prevdom = n; |
| 1403 | Node *dom = idom(prevdom); |
| 1404 | while (dom != cutoff) { |
| 1405 | if (dom->req() > 1 && dom->in(1) == bol && prevdom->in(0) == dom && |
| 1406 | safe_for_if_replacement(dom)) { |
| 1407 | // It's invalid to move control dependent data nodes in the inner |
| 1408 | // strip-mined loop, because: |
| 1409 | // 1) break validation of LoopNode::verify_strip_mined() |
| 1410 | // 2) move code with side-effect in strip-mined loop |
| 1411 | // Move to the exit of outer strip-mined loop in that case. |
| 1412 | Node* out_le = is_inner_of_stripmined_loop(dom); |
| 1413 | if (out_le != NULL__null) { |
| 1414 | prevdom = out_le; |
| 1415 | } |
| 1416 | // Replace the dominated test with an obvious true or false. |
| 1417 | // Place it on the IGVN worklist for later cleanup. |
| 1418 | C->set_major_progress(); |
| 1419 | dominated_by(prevdom, n, false, true); |
| 1420 | #ifndef PRODUCT |
| 1421 | if( VerifyLoopOptimizations ) verify(); |
| 1422 | #endif |
| 1423 | return; |
| 1424 | } |
| 1425 | prevdom = dom; |
| 1426 | dom = idom(prevdom); |
| 1427 | } |
| 1428 | } |
| 1429 | } |
| 1430 | |
| 1431 | try_sink_out_of_loop(n); |
| 1432 | |
| 1433 | try_move_store_after_loop(n); |
| 1434 | |
| 1435 | // Check for Opaque2's who's loop has disappeared - who's input is in the |
| 1436 | // same loop nest as their output. Remove 'em, they are no longer useful. |
| 1437 | if( n_op == Op_Opaque2 && |
| 1438 | n->in(1) != NULL__null && |
| 1439 | get_loop(get_ctrl(n)) == get_loop(get_ctrl(n->in(1))) ) { |
| 1440 | _igvn.replace_node( n, n->in(1) ); |
| 1441 | } |
| 1442 | } |
| 1443 | |
| 1444 | bool PhaseIdealLoop::safe_for_if_replacement(const Node* dom) const { |
| 1445 | if (!dom->is_CountedLoopEnd()) { |
| 1446 | return true; |
| 1447 | } |
| 1448 | CountedLoopEndNode* le = dom->as_CountedLoopEnd(); |
| 1449 | CountedLoopNode* cl = le->loopnode(); |
| 1450 | if (cl == NULL__null) { |
| 1451 | return true; |
| 1452 | } |
| 1453 | if (!cl->is_main_loop()) { |
| 1454 | return true; |
| 1455 | } |
| 1456 | if (cl->is_canonical_loop_entry() == NULL__null) { |
| 1457 | return true; |
| 1458 | } |
| 1459 | // Further unrolling is possible so loop exit condition might change |
| 1460 | return false; |
| 1461 | } |
| 1462 | |
| 1463 | // See if a shared loop-varying computation has no loop-varying uses. |
| 1464 | // Happens if something is only used for JVM state in uncommon trap exits, |
| 1465 | // like various versions of induction variable+offset. Clone the |
| 1466 | // computation per usage to allow it to sink out of the loop. |
| 1467 | void PhaseIdealLoop::try_sink_out_of_loop(Node* n) { |
| 1468 | bool is_raw_to_oop_cast = n->is_ConstraintCast() && |
| 1469 | n->in(1)->bottom_type()->isa_rawptr() && |
| 1470 | !n->bottom_type()->isa_rawptr(); |
| 1471 | if (has_ctrl(n) && |
| 1472 | !n->is_Phi() && |
| 1473 | !n->is_Bool() && |
| 1474 | !n->is_Proj() && |
| 1475 | !n->is_MergeMem() && |
| 1476 | !n->is_CMove() && |
| 1477 | !is_raw_to_oop_cast && // don't extend live ranges of raw oops |
| 1478 | n->Opcode() != Op_Opaque4 && |
| 1479 | !n->is_Type()) { |
| 1480 | Node *n_ctrl = get_ctrl(n); |
| 1481 | IdealLoopTree *n_loop = get_loop(n_ctrl); |
| 1482 | |
| 1483 | if (n->in(0) != NULL__null) { |
| 1484 | IdealLoopTree* loop_ctrl = get_loop(n->in(0)); |
| 1485 | if (n_loop != loop_ctrl && n_loop->is_member(loop_ctrl)) { |
| 1486 | // n has a control input inside a loop but get_ctrl() is member of an outer loop. This could happen, for example, |
| 1487 | // for Div nodes inside a loop (control input inside loop) without a use except for an UCT (outside the loop). |
| 1488 | // Rewire control of n to right outside of the loop, regardless if its input(s) are later sunk or not. |
| 1489 | _igvn.replace_input_of(n, 0, place_outside_loop(n_ctrl, loop_ctrl)); |
| 1490 | } |
| 1491 | } |
| 1492 | if (n_loop != _ltree_root && n->outcnt() > 1) { |
| 1493 | // Compute early control: needed for anti-dependence analysis. It's also possible that as a result of |
| 1494 | // previous transformations in this loop opts round, the node can be hoisted now: early control will tell us. |
| 1495 | Node* early_ctrl = compute_early_ctrl(n, n_ctrl); |
| 1496 | if (n_loop->is_member(get_loop(early_ctrl)) && // check that this one can't be hoisted now |
| 1497 | ctrl_of_all_uses_out_of_loop(n, early_ctrl, n_loop)) { // All uses in outer loops! |
| 1498 | assert(!n->is_Store() && !n->is_LoadStore(), "no node with a side effect")do { if (!(!n->is_Store() && !n->is_LoadStore() )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1498, "assert(" "!n->is_Store() && !n->is_LoadStore()" ") failed", "no node with a side effect"); ::breakpoint(); } } while (0); |
| 1499 | Node* outer_loop_clone = NULL__null; |
| 1500 | for (DUIterator_Last jmin, j = n->last_outs(jmin); j >= jmin;) { |
| 1501 | Node* u = n->last_out(j); // Clone private computation per use |
| 1502 | _igvn.rehash_node_delayed(u); |
| 1503 | Node* x = n->clone(); // Clone computation |
| 1504 | Node* x_ctrl = NULL__null; |
| 1505 | if (u->is_Phi()) { |
| 1506 | // Replace all uses of normal nodes. Replace Phi uses |
| 1507 | // individually, so the separate Nodes can sink down |
| 1508 | // different paths. |
| 1509 | uint k = 1; |
| 1510 | while (u->in(k) != n) k++; |
| 1511 | u->set_req(k, x); |
| 1512 | // x goes next to Phi input path |
| 1513 | x_ctrl = u->in(0)->in(k); |
| 1514 | // Find control for 'x' next to use but not inside inner loops. |
| 1515 | x_ctrl = place_outside_loop(x_ctrl, n_loop); |
| 1516 | --j; |
| 1517 | } else { // Normal use |
| 1518 | if (has_ctrl(u)) { |
| 1519 | x_ctrl = get_ctrl(u); |
| 1520 | } else { |
| 1521 | x_ctrl = u->in(0); |
| 1522 | } |
| 1523 | // Find control for 'x' next to use but not inside inner loops. |
| 1524 | x_ctrl = place_outside_loop(x_ctrl, n_loop); |
| 1525 | // Replace all uses |
| 1526 | if (u->is_ConstraintCast() && u->bottom_type()->higher_equal(_igvn.type(n)) && u->in(0) == x_ctrl) { |
| 1527 | // If we're sinking a chain of data nodes, we might have inserted a cast to pin the use which is not necessary |
| 1528 | // anymore now that we're going to pin n as well |
| 1529 | _igvn.replace_node(u, x); |
| 1530 | --j; |
| 1531 | } else { |
| 1532 | int nb = u->replace_edge(n, x, &_igvn); |
| 1533 | j -= nb; |
| 1534 | } |
| 1535 | } |
| 1536 | |
| 1537 | if (n->is_Load()) { |
| 1538 | // For loads, add a control edge to a CFG node outside of the loop |
| 1539 | // to force them to not combine and return back inside the loop |
| 1540 | // during GVN optimization (4641526). |
| 1541 | assert(x_ctrl == get_late_ctrl_with_anti_dep(x->as_Load(), early_ctrl, x_ctrl), "anti-dependences were already checked")do { if (!(x_ctrl == get_late_ctrl_with_anti_dep(x->as_Load (), early_ctrl, x_ctrl))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1541, "assert(" "x_ctrl == get_late_ctrl_with_anti_dep(x->as_Load(), early_ctrl, x_ctrl)" ") failed", "anti-dependences were already checked"); ::breakpoint (); } } while (0); |
| 1542 | |
| 1543 | IdealLoopTree* x_loop = get_loop(x_ctrl); |
| 1544 | Node* x_head = x_loop->_head; |
| 1545 | if (x_head->is_Loop() && x_head->is_OuterStripMinedLoop()) { |
| 1546 | // Do not add duplicate LoadNodes to the outer strip mined loop |
| 1547 | if (outer_loop_clone != NULL__null) { |
| 1548 | _igvn.replace_node(x, outer_loop_clone); |
| 1549 | continue; |
| 1550 | } |
| 1551 | outer_loop_clone = x; |
| 1552 | } |
| 1553 | x->set_req(0, x_ctrl); |
| 1554 | } else if (n->in(0) != NULL__null){ |
| 1555 | x->set_req(0, x_ctrl); |
| 1556 | } |
| 1557 | assert(dom_depth(n_ctrl) <= dom_depth(x_ctrl), "n is later than its clone")do { if (!(dom_depth(n_ctrl) <= dom_depth(x_ctrl))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1557, "assert(" "dom_depth(n_ctrl) <= dom_depth(x_ctrl)" ") failed", "n is later than its clone"); ::breakpoint(); } } while (0); |
| 1558 | assert(!n_loop->is_member(get_loop(x_ctrl)), "should have moved out of loop")do { if (!(!n_loop->is_member(get_loop(x_ctrl)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1558, "assert(" "!n_loop->is_member(get_loop(x_ctrl))" ") failed" , "should have moved out of loop"); ::breakpoint(); } } while (0); |
| 1559 | register_new_node(x, x_ctrl); |
| 1560 | |
| 1561 | // Chain of AddP: (AddP base (AddP base )) must keep the same base after sinking so: |
| 1562 | // 1- We don't add a CastPP here when the first one is sunk so if the second one is not, their bases remain |
| 1563 | // the same. |
| 1564 | // (see 2- below) |
| 1565 | assert(!x->is_AddP() || !x->in(AddPNode::Address)->is_AddP() ||do { if (!(!x->is_AddP() || !x->in(AddPNode::Address)-> is_AddP() || x->in(AddPNode::Address)->in(AddPNode::Base ) == x->in(AddPNode::Base) || !x->in(AddPNode::Address) ->in(AddPNode::Base)->eqv_uncast(x->in(AddPNode::Base )))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1567, "assert(" "!x->is_AddP() || !x->in(AddPNode::Address)->is_AddP() || x->in(AddPNode::Address)->in(AddPNode::Base) == x->in(AddPNode::Base) || !x->in(AddPNode::Address)->in(AddPNode::Base)->eqv_uncast(x->in(AddPNode::Base))" ") failed", "unexpected AddP shape"); ::breakpoint(); } } while (0) |
| 1566 | x->in(AddPNode::Address)->in(AddPNode::Base) == x->in(AddPNode::Base) ||do { if (!(!x->is_AddP() || !x->in(AddPNode::Address)-> is_AddP() || x->in(AddPNode::Address)->in(AddPNode::Base ) == x->in(AddPNode::Base) || !x->in(AddPNode::Address) ->in(AddPNode::Base)->eqv_uncast(x->in(AddPNode::Base )))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1567, "assert(" "!x->is_AddP() || !x->in(AddPNode::Address)->is_AddP() || x->in(AddPNode::Address)->in(AddPNode::Base) == x->in(AddPNode::Base) || !x->in(AddPNode::Address)->in(AddPNode::Base)->eqv_uncast(x->in(AddPNode::Base))" ") failed", "unexpected AddP shape"); ::breakpoint(); } } while (0) |
| 1567 | !x->in(AddPNode::Address)->in(AddPNode::Base)->eqv_uncast(x->in(AddPNode::Base)), "unexpected AddP shape")do { if (!(!x->is_AddP() || !x->in(AddPNode::Address)-> is_AddP() || x->in(AddPNode::Address)->in(AddPNode::Base ) == x->in(AddPNode::Base) || !x->in(AddPNode::Address) ->in(AddPNode::Base)->eqv_uncast(x->in(AddPNode::Base )))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1567, "assert(" "!x->is_AddP() || !x->in(AddPNode::Address)->is_AddP() || x->in(AddPNode::Address)->in(AddPNode::Base) == x->in(AddPNode::Base) || !x->in(AddPNode::Address)->in(AddPNode::Base)->eqv_uncast(x->in(AddPNode::Base))" ") failed", "unexpected AddP shape"); ::breakpoint(); } } while (0); |
| 1568 | if (x->in(0) == NULL__null && !x->is_DecodeNarrowPtr() && |
| 1569 | !(x->is_AddP() && x->in(AddPNode::Address)->is_AddP() && x->in(AddPNode::Address)->in(AddPNode::Base) == x->in(AddPNode::Base))) { |
| 1570 | assert(!x->is_Load(), "load should be pinned")do { if (!(!x->is_Load())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1570, "assert(" "!x->is_Load()" ") failed", "load should be pinned" ); ::breakpoint(); } } while (0); |
| 1571 | // Use a cast node to pin clone out of loop |
| 1572 | Node* cast = NULL__null; |
| 1573 | for (uint k = 0; k < x->req(); k++) { |
| 1574 | Node* in = x->in(k); |
| 1575 | if (in != NULL__null && n_loop->is_member(get_loop(get_ctrl(in)))) { |
| 1576 | const Type* in_t = _igvn.type(in); |
| 1577 | cast = ConstraintCastNode::make_cast_for_type(x_ctrl, in, in_t, ConstraintCastNode::UnconditionalDependency); |
| 1578 | } |
| 1579 | if (cast != NULL__null) { |
| 1580 | register_new_node(cast, x_ctrl); |
| 1581 | x->replace_edge(in, cast); |
| 1582 | // Chain of AddP: |
| 1583 | // 2- A CastPP of the base is only added now that both AddP nodes are sunk |
| 1584 | if (x->is_AddP() && k == AddPNode::Base) { |
| 1585 | for (DUIterator_Fast imax, i = x->fast_outs(imax); i < imax; i++) { |
| 1586 | Node* u = x->fast_out(i); |
| 1587 | if (u->is_AddP() && u->in(AddPNode::Base) == n->in(AddPNode::Base)) { |
| 1588 | _igvn.replace_input_of(u, AddPNode::Base, cast); |
| 1589 | assert(u->find_out_with(Op_AddP) == NULL, "more than 2 chained AddP nodes?")do { if (!(u->find_out_with(Op_AddP) == __null)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1589, "assert(" "u->find_out_with(Op_AddP) == __null" ") failed" , "more than 2 chained AddP nodes?"); ::breakpoint(); } } while (0); |
| 1590 | } |
| 1591 | } |
| 1592 | } |
| 1593 | break; |
| 1594 | } |
| 1595 | } |
| 1596 | assert(cast != NULL, "must have added a cast to pin the node")do { if (!(cast != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1596, "assert(" "cast != __null" ") failed", "must have added a cast to pin the node" ); ::breakpoint(); } } while (0); |
| 1597 | } |
| 1598 | } |
| 1599 | _igvn.remove_dead_node(n); |
| 1600 | } |
| 1601 | _dom_lca_tags_round = 0; |
| 1602 | } |
| 1603 | } |
| 1604 | } |
| 1605 | |
| 1606 | Node* PhaseIdealLoop::compute_early_ctrl(Node* n, Node* n_ctrl) { |
| 1607 | Node* early_ctrl = NULL__null; |
| 1608 | ResourceMark rm; |
| 1609 | Unique_Node_List wq; |
| 1610 | wq.push(n); |
| 1611 | for (uint i = 0; i < wq.size(); i++) { |
| 1612 | Node* m = wq.at(i); |
| 1613 | Node* c = NULL__null; |
| 1614 | if (m->is_CFG()) { |
| 1615 | c = m; |
| 1616 | } else if (m->pinned()) { |
| 1617 | c = m->in(0); |
| 1618 | } else { |
| 1619 | for (uint j = 0; j < m->req(); j++) { |
| 1620 | Node* in = m->in(j); |
| 1621 | if (in == NULL__null) { |
| 1622 | continue; |
| 1623 | } |
| 1624 | wq.push(in); |
| 1625 | } |
| 1626 | } |
| 1627 | if (c != NULL__null) { |
| 1628 | assert(is_dominator(c, n_ctrl), "")do { if (!(is_dominator(c, n_ctrl))) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1628, "assert(" "is_dominator(c, n_ctrl)" ") failed", ""); :: breakpoint(); } } while (0); |
| 1629 | if (early_ctrl == NULL__null) { |
| 1630 | early_ctrl = c; |
| 1631 | } else if (is_dominator(early_ctrl, c)) { |
| 1632 | early_ctrl = c; |
| 1633 | } |
| 1634 | } |
| 1635 | } |
| 1636 | assert(is_dominator(early_ctrl, n_ctrl), "early control must dominate current control")do { if (!(is_dominator(early_ctrl, n_ctrl))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1636, "assert(" "is_dominator(early_ctrl, n_ctrl)" ") failed" , "early control must dominate current control"); ::breakpoint (); } } while (0); |
| 1637 | return early_ctrl; |
| 1638 | } |
| 1639 | |
| 1640 | bool PhaseIdealLoop::ctrl_of_all_uses_out_of_loop(const Node* n, Node* n_ctrl, IdealLoopTree* n_loop) { |
| 1641 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
| 1642 | Node* u = n->fast_out(i); |
| 1643 | if (u->Opcode() == Op_Opaque1) { |
| 1644 | return false; // Found loop limit, bugfix for 4677003 |
| 1645 | } |
| 1646 | // We can't reuse tags in PhaseIdealLoop::dom_lca_for_get_late_ctrl_internal() so make sure calls to |
| 1647 | // get_late_ctrl_with_anti_dep() use their own tag |
| 1648 | _dom_lca_tags_round++; |
| 1649 | assert(_dom_lca_tags_round != 0, "shouldn't wrap around")do { if (!(_dom_lca_tags_round != 0)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1649, "assert(" "_dom_lca_tags_round != 0" ") failed", "shouldn't wrap around" ); ::breakpoint(); } } while (0); |
| 1650 | |
| 1651 | if (u->is_Phi()) { |
| 1652 | for (uint j = 1; j < u->req(); ++j) { |
| 1653 | if (u->in(j) == n && !ctrl_of_use_out_of_loop(n, n_ctrl, n_loop, u->in(0)->in(j))) { |
| 1654 | return false; |
| 1655 | } |
| 1656 | } |
| 1657 | } else { |
| 1658 | Node* ctrl = has_ctrl(u) ? get_ctrl(u) : u->in(0); |
| 1659 | if (!ctrl_of_use_out_of_loop(n, n_ctrl, n_loop, ctrl)) { |
| 1660 | return false; |
| 1661 | } |
| 1662 | } |
| 1663 | } |
| 1664 | return true; |
| 1665 | } |
| 1666 | |
| 1667 | bool PhaseIdealLoop::ctrl_of_use_out_of_loop(const Node* n, Node* n_ctrl, IdealLoopTree* n_loop, Node* ctrl) { |
| 1668 | if (n->is_Load()) { |
| 1669 | ctrl = get_late_ctrl_with_anti_dep(n->as_Load(), n_ctrl, ctrl); |
| 1670 | } |
| 1671 | IdealLoopTree *u_loop = get_loop(ctrl); |
| 1672 | if (u_loop == n_loop) { |
| 1673 | return false; // Found loop-varying use |
| 1674 | } |
| 1675 | if (n_loop->is_member(u_loop)) { |
| 1676 | return false; // Found use in inner loop |
| 1677 | } |
| 1678 | return true; |
| 1679 | } |
| 1680 | |
| 1681 | //------------------------------split_if_with_blocks--------------------------- |
| 1682 | // Check for aggressive application of 'split-if' optimization, |
| 1683 | // using basic block level info. |
| 1684 | void PhaseIdealLoop::split_if_with_blocks(VectorSet &visited, Node_Stack &nstack) { |
| 1685 | Node* root = C->root(); |
| 1686 | visited.set(root->_idx); // first, mark root as visited |
| 1687 | // Do pre-visit work for root |
| 1688 | Node* n = split_if_with_blocks_pre(root); |
| 1689 | uint cnt = n->outcnt(); |
| 1690 | uint i = 0; |
| 1691 | |
| 1692 | while (true) { |
| 1693 | // Visit all children |
| 1694 | if (i < cnt) { |
| 1695 | Node* use = n->raw_out(i); |
| 1696 | ++i; |
| 1697 | if (use->outcnt() != 0 && !visited.test_set(use->_idx)) { |
| 1698 | // Now do pre-visit work for this use |
| 1699 | use = split_if_with_blocks_pre(use); |
| 1700 | nstack.push(n, i); // Save parent and next use's index. |
| 1701 | n = use; // Process all children of current use. |
| 1702 | cnt = use->outcnt(); |
| 1703 | i = 0; |
| 1704 | } |
| 1705 | } |
| 1706 | else { |
| 1707 | // All of n's children have been processed, complete post-processing. |
| 1708 | if (cnt != 0 && !n->is_Con()) { |
| 1709 | assert(has_node(n), "no dead nodes")do { if (!(has_node(n))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1709, "assert(" "has_node(n)" ") failed", "no dead nodes"); ::breakpoint(); } } while (0); |
| 1710 | split_if_with_blocks_post(n); |
| 1711 | } |
| 1712 | if (must_throttle_split_if()) { |
| 1713 | nstack.clear(); |
| 1714 | } |
| 1715 | if (nstack.is_empty()) { |
| 1716 | // Finished all nodes on stack. |
| 1717 | break; |
| 1718 | } |
| 1719 | // Get saved parent node and next use's index. Visit the rest of uses. |
| 1720 | n = nstack.node(); |
| 1721 | cnt = n->outcnt(); |
| 1722 | i = nstack.index(); |
| 1723 | nstack.pop(); |
| 1724 | } |
| 1725 | } |
| 1726 | } |
| 1727 | |
| 1728 | |
| 1729 | //============================================================================= |
| 1730 | // |
| 1731 | // C L O N E A L O O P B O D Y |
| 1732 | // |
| 1733 | |
| 1734 | //------------------------------clone_iff-------------------------------------- |
| 1735 | // Passed in a Phi merging (recursively) some nearly equivalent Bool/Cmps. |
| 1736 | // "Nearly" because all Nodes have been cloned from the original in the loop, |
| 1737 | // but the fall-in edges to the Cmp are different. Clone bool/Cmp pairs |
| 1738 | // through the Phi recursively, and return a Bool. |
| 1739 | Node* PhaseIdealLoop::clone_iff(PhiNode *phi, IdealLoopTree *loop) { |
| 1740 | |
| 1741 | // Convert this Phi into a Phi merging Bools |
| 1742 | uint i; |
| 1743 | for (i = 1; i < phi->req(); i++) { |
| 1744 | Node *b = phi->in(i); |
| 1745 | if (b->is_Phi()) { |
| 1746 | _igvn.replace_input_of(phi, i, clone_iff(b->as_Phi(), loop)); |
| 1747 | } else { |
| 1748 | assert(b->is_Bool() || b->Opcode() == Op_Opaque4, "")do { if (!(b->is_Bool() || b->Opcode() == Op_Opaque4)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1748, "assert(" "b->is_Bool() || b->Opcode() == Op_Opaque4" ") failed", ""); ::breakpoint(); } } while (0); |
| 1749 | } |
| 1750 | } |
| 1751 | |
| 1752 | Node* n = phi->in(1); |
| 1753 | Node* sample_opaque = NULL__null; |
| 1754 | Node *sample_bool = NULL__null; |
| 1755 | if (n->Opcode() == Op_Opaque4) { |
| 1756 | sample_opaque = n; |
| 1757 | sample_bool = n->in(1); |
| 1758 | assert(sample_bool->is_Bool(), "wrong type")do { if (!(sample_bool->is_Bool())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1758, "assert(" "sample_bool->is_Bool()" ") failed", "wrong type" ); ::breakpoint(); } } while (0); |
| 1759 | } else { |
| 1760 | sample_bool = n; |
| 1761 | } |
| 1762 | Node *sample_cmp = sample_bool->in(1); |
| 1763 | |
| 1764 | // Make Phis to merge the Cmp's inputs. |
| 1765 | PhiNode *phi1 = new PhiNode(phi->in(0), Type::TOP); |
| 1766 | PhiNode *phi2 = new PhiNode(phi->in(0), Type::TOP); |
| 1767 | for (i = 1; i < phi->req(); i++) { |
| 1768 | Node *n1 = sample_opaque == NULL__null ? phi->in(i)->in(1)->in(1) : phi->in(i)->in(1)->in(1)->in(1); |
| 1769 | Node *n2 = sample_opaque == NULL__null ? phi->in(i)->in(1)->in(2) : phi->in(i)->in(1)->in(1)->in(2); |
| 1770 | phi1->set_req(i, n1); |
| 1771 | phi2->set_req(i, n2); |
| 1772 | phi1->set_type(phi1->type()->meet_speculative(n1->bottom_type())); |
| 1773 | phi2->set_type(phi2->type()->meet_speculative(n2->bottom_type())); |
| 1774 | } |
| 1775 | // See if these Phis have been made before. |
| 1776 | // Register with optimizer |
| 1777 | Node *hit1 = _igvn.hash_find_insert(phi1); |
| 1778 | if (hit1) { // Hit, toss just made Phi |
| 1779 | _igvn.remove_dead_node(phi1); // Remove new phi |
| 1780 | assert(hit1->is_Phi(), "" )do { if (!(hit1->is_Phi())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1780, "assert(" "hit1->is_Phi()" ") failed", ""); ::breakpoint (); } } while (0); |
| 1781 | phi1 = (PhiNode*)hit1; // Use existing phi |
| 1782 | } else { // Miss |
| 1783 | _igvn.register_new_node_with_optimizer(phi1); |
| 1784 | } |
| 1785 | Node *hit2 = _igvn.hash_find_insert(phi2); |
| 1786 | if (hit2) { // Hit, toss just made Phi |
| 1787 | _igvn.remove_dead_node(phi2); // Remove new phi |
| 1788 | assert(hit2->is_Phi(), "" )do { if (!(hit2->is_Phi())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1788, "assert(" "hit2->is_Phi()" ") failed", ""); ::breakpoint (); } } while (0); |
| 1789 | phi2 = (PhiNode*)hit2; // Use existing phi |
| 1790 | } else { // Miss |
| 1791 | _igvn.register_new_node_with_optimizer(phi2); |
| 1792 | } |
| 1793 | // Register Phis with loop/block info |
| 1794 | set_ctrl(phi1, phi->in(0)); |
| 1795 | set_ctrl(phi2, phi->in(0)); |
| 1796 | // Make a new Cmp |
| 1797 | Node *cmp = sample_cmp->clone(); |
| 1798 | cmp->set_req(1, phi1); |
| 1799 | cmp->set_req(2, phi2); |
| 1800 | _igvn.register_new_node_with_optimizer(cmp); |
| 1801 | set_ctrl(cmp, phi->in(0)); |
| 1802 | |
| 1803 | // Make a new Bool |
| 1804 | Node *b = sample_bool->clone(); |
| 1805 | b->set_req(1,cmp); |
| 1806 | _igvn.register_new_node_with_optimizer(b); |
| 1807 | set_ctrl(b, phi->in(0)); |
| 1808 | |
| 1809 | if (sample_opaque != NULL__null) { |
| 1810 | Node* opaque = sample_opaque->clone(); |
| 1811 | opaque->set_req(1, b); |
| 1812 | _igvn.register_new_node_with_optimizer(opaque); |
| 1813 | set_ctrl(opaque, phi->in(0)); |
| 1814 | return opaque; |
| 1815 | } |
| 1816 | |
| 1817 | assert(b->is_Bool(), "")do { if (!(b->is_Bool())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1817, "assert(" "b->is_Bool()" ") failed", ""); ::breakpoint (); } } while (0); |
| 1818 | return b; |
| 1819 | } |
| 1820 | |
| 1821 | //------------------------------clone_bool------------------------------------- |
| 1822 | // Passed in a Phi merging (recursively) some nearly equivalent Bool/Cmps. |
| 1823 | // "Nearly" because all Nodes have been cloned from the original in the loop, |
| 1824 | // but the fall-in edges to the Cmp are different. Clone bool/Cmp pairs |
| 1825 | // through the Phi recursively, and return a Bool. |
| 1826 | CmpNode *PhaseIdealLoop::clone_bool( PhiNode *phi, IdealLoopTree *loop ) { |
| 1827 | uint i; |
| 1828 | // Convert this Phi into a Phi merging Bools |
| 1829 | for( i = 1; i < phi->req(); i++ ) { |
| 1830 | Node *b = phi->in(i); |
| 1831 | if( b->is_Phi() ) { |
| 1832 | _igvn.replace_input_of(phi, i, clone_bool( b->as_Phi(), loop )); |
| 1833 | } else { |
| 1834 | assert( b->is_Cmp() || b->is_top(), "inputs are all Cmp or TOP" )do { if (!(b->is_Cmp() || b->is_top())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1834, "assert(" "b->is_Cmp() || b->is_top()" ") failed" , "inputs are all Cmp or TOP"); ::breakpoint(); } } while (0); |
| 1835 | } |
| 1836 | } |
| 1837 | |
| 1838 | Node *sample_cmp = phi->in(1); |
| 1839 | |
| 1840 | // Make Phis to merge the Cmp's inputs. |
| 1841 | PhiNode *phi1 = new PhiNode( phi->in(0), Type::TOP ); |
| 1842 | PhiNode *phi2 = new PhiNode( phi->in(0), Type::TOP ); |
| 1843 | for( uint j = 1; j < phi->req(); j++ ) { |
| 1844 | Node *cmp_top = phi->in(j); // Inputs are all Cmp or TOP |
| 1845 | Node *n1, *n2; |
| 1846 | if( cmp_top->is_Cmp() ) { |
| 1847 | n1 = cmp_top->in(1); |
| 1848 | n2 = cmp_top->in(2); |
| 1849 | } else { |
| 1850 | n1 = n2 = cmp_top; |
| 1851 | } |
| 1852 | phi1->set_req( j, n1 ); |
| 1853 | phi2->set_req( j, n2 ); |
| 1854 | phi1->set_type(phi1->type()->meet_speculative(n1->bottom_type())); |
| 1855 | phi2->set_type(phi2->type()->meet_speculative(n2->bottom_type())); |
| 1856 | } |
| 1857 | |
| 1858 | // See if these Phis have been made before. |
| 1859 | // Register with optimizer |
| 1860 | Node *hit1 = _igvn.hash_find_insert(phi1); |
| 1861 | if( hit1 ) { // Hit, toss just made Phi |
| 1862 | _igvn.remove_dead_node(phi1); // Remove new phi |
| 1863 | assert( hit1->is_Phi(), "" )do { if (!(hit1->is_Phi())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1863, "assert(" "hit1->is_Phi()" ") failed", ""); ::breakpoint (); } } while (0); |
| 1864 | phi1 = (PhiNode*)hit1; // Use existing phi |
| 1865 | } else { // Miss |
| 1866 | _igvn.register_new_node_with_optimizer(phi1); |
| 1867 | } |
| 1868 | Node *hit2 = _igvn.hash_find_insert(phi2); |
| 1869 | if( hit2 ) { // Hit, toss just made Phi |
| 1870 | _igvn.remove_dead_node(phi2); // Remove new phi |
| 1871 | assert( hit2->is_Phi(), "" )do { if (!(hit2->is_Phi())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1871, "assert(" "hit2->is_Phi()" ") failed", ""); ::breakpoint (); } } while (0); |
| 1872 | phi2 = (PhiNode*)hit2; // Use existing phi |
| 1873 | } else { // Miss |
| 1874 | _igvn.register_new_node_with_optimizer(phi2); |
| 1875 | } |
| 1876 | // Register Phis with loop/block info |
| 1877 | set_ctrl(phi1, phi->in(0)); |
| 1878 | set_ctrl(phi2, phi->in(0)); |
| 1879 | // Make a new Cmp |
| 1880 | Node *cmp = sample_cmp->clone(); |
| 1881 | cmp->set_req( 1, phi1 ); |
| 1882 | cmp->set_req( 2, phi2 ); |
| 1883 | _igvn.register_new_node_with_optimizer(cmp); |
| 1884 | set_ctrl(cmp, phi->in(0)); |
| 1885 | |
| 1886 | assert( cmp->is_Cmp(), "" )do { if (!(cmp->is_Cmp())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1886, "assert(" "cmp->is_Cmp()" ") failed", ""); ::breakpoint (); } } while (0); |
| 1887 | return (CmpNode*)cmp; |
| 1888 | } |
| 1889 | |
| 1890 | //------------------------------sink_use--------------------------------------- |
| 1891 | // If 'use' was in the loop-exit block, it now needs to be sunk |
| 1892 | // below the post-loop merge point. |
| 1893 | void PhaseIdealLoop::sink_use( Node *use, Node *post_loop ) { |
| 1894 | if (!use->is_CFG() && get_ctrl(use) == post_loop->in(2)) { |
| 1895 | set_ctrl(use, post_loop); |
| 1896 | for (DUIterator j = use->outs(); use->has_out(j); j++) |
| 1897 | sink_use(use->out(j), post_loop); |
| 1898 | } |
| 1899 | } |
| 1900 | |
| 1901 | void PhaseIdealLoop::clone_loop_handle_data_uses(Node* old, Node_List &old_new, |
| 1902 | IdealLoopTree* loop, IdealLoopTree* outer_loop, |
| 1903 | Node_List*& split_if_set, Node_List*& split_bool_set, |
| 1904 | Node_List*& split_cex_set, Node_List& worklist, |
| 1905 | uint new_counter, CloneLoopMode mode) { |
| 1906 | Node* nnn = old_new[old->_idx]; |
| 1907 | // Copy uses to a worklist, so I can munge the def-use info |
| 1908 | // with impunity. |
| 1909 | for (DUIterator_Fast jmax, j = old->fast_outs(jmax); j < jmax; j++) |
| 1910 | worklist.push(old->fast_out(j)); |
| 1911 | |
| 1912 | while( worklist.size() ) { |
| 1913 | Node *use = worklist.pop(); |
| 1914 | if (!has_node(use)) continue; // Ignore dead nodes |
| 1915 | if (use->in(0) == C->top()) continue; |
| 1916 | IdealLoopTree *use_loop = get_loop( has_ctrl(use) ? get_ctrl(use) : use ); |
| 1917 | // Check for data-use outside of loop - at least one of OLD or USE |
| 1918 | // must not be a CFG node. |
| 1919 | #ifdef ASSERT1 |
| 1920 | if (loop->_head->as_Loop()->is_strip_mined() && outer_loop->is_member(use_loop) && !loop->is_member(use_loop) && old_new[use->_idx] == NULL__null) { |
| 1921 | Node* sfpt = loop->_head->as_CountedLoop()->outer_safepoint(); |
| 1922 | assert(mode != IgnoreStripMined, "incorrect cloning mode")do { if (!(mode != IgnoreStripMined)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1922, "assert(" "mode != IgnoreStripMined" ") failed", "incorrect cloning mode" ); ::breakpoint(); } } while (0); |
| 1923 | assert((mode == ControlAroundStripMined && use == sfpt) || !use->is_reachable_from_root(), "missed a node")do { if (!((mode == ControlAroundStripMined && use == sfpt) || !use->is_reachable_from_root())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1923, "assert(" "(mode == ControlAroundStripMined && use == sfpt) || !use->is_reachable_from_root()" ") failed", "missed a node"); ::breakpoint(); } } while (0); |
| 1924 | } |
| 1925 | #endif |
| 1926 | if (!loop->is_member(use_loop) && !outer_loop->is_member(use_loop) && (!old->is_CFG() || !use->is_CFG())) { |
| 1927 | |
| 1928 | // If the Data use is an IF, that means we have an IF outside of the |
| 1929 | // loop that is switching on a condition that is set inside of the |
| 1930 | // loop. Happens if people set a loop-exit flag; then test the flag |
| 1931 | // in the loop to break the loop, then test is again outside of the |
| 1932 | // loop to determine which way the loop exited. |
| 1933 | // Loop predicate If node connects to Bool node through Opaque1 node. |
| 1934 | if (use->is_If() || use->is_CMove() || C->is_predicate_opaq(use) || use->Opcode() == Op_Opaque4) { |
| 1935 | // Since this code is highly unlikely, we lazily build the worklist |
| 1936 | // of such Nodes to go split. |
| 1937 | if (!split_if_set) { |
| 1938 | split_if_set = new Node_List(); |
| 1939 | } |
| 1940 | split_if_set->push(use); |
| 1941 | } |
| 1942 | if (use->is_Bool()) { |
| 1943 | if (!split_bool_set) { |
| 1944 | split_bool_set = new Node_List(); |
| 1945 | } |
| 1946 | split_bool_set->push(use); |
| 1947 | } |
| 1948 | if (use->Opcode() == Op_CreateEx) { |
| 1949 | if (!split_cex_set) { |
| 1950 | split_cex_set = new Node_List(); |
| 1951 | } |
| 1952 | split_cex_set->push(use); |
| 1953 | } |
| 1954 | |
| 1955 | |
| 1956 | // Get "block" use is in |
| 1957 | uint idx = 0; |
| 1958 | while( use->in(idx) != old ) idx++; |
| 1959 | Node *prev = use->is_CFG() ? use : get_ctrl(use); |
| 1960 | assert(!loop->is_member(get_loop(prev)) && !outer_loop->is_member(get_loop(prev)), "" )do { if (!(!loop->is_member(get_loop(prev)) && !outer_loop ->is_member(get_loop(prev)))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1960, "assert(" "!loop->is_member(get_loop(prev)) && !outer_loop->is_member(get_loop(prev))" ") failed", ""); ::breakpoint(); } } while (0); |
| 1961 | Node *cfg = prev->_idx >= new_counter |
| 1962 | ? prev->in(2) |
| 1963 | : idom(prev); |
| 1964 | if( use->is_Phi() ) // Phi use is in prior block |
| 1965 | cfg = prev->in(idx); // NOT in block of Phi itself |
| 1966 | if (cfg->is_top()) { // Use is dead? |
| 1967 | _igvn.replace_input_of(use, idx, C->top()); |
| 1968 | continue; |
| 1969 | } |
| 1970 | |
| 1971 | // If use is referenced through control edge... (idx == 0) |
| 1972 | if (mode == IgnoreStripMined && idx == 0) { |
| 1973 | LoopNode *head = loop->_head->as_Loop(); |
| 1974 | if (head->is_strip_mined() && is_dominator(head->outer_loop_exit(), prev)) { |
| 1975 | // That node is outside the inner loop, leave it outside the |
| 1976 | // outer loop as well to not confuse verification code. |
| 1977 | assert(!loop->_parent->is_member(use_loop), "should be out of the outer loop")do { if (!(!loop->_parent->is_member(use_loop))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 1977, "assert(" "!loop->_parent->is_member(use_loop)" ") failed", "should be out of the outer loop"); ::breakpoint (); } } while (0); |
| 1978 | _igvn.replace_input_of(use, 0, head->outer_loop_exit()); |
| 1979 | continue; |
| 1980 | } |
| 1981 | } |
| 1982 | |
| 1983 | while(!outer_loop->is_member(get_loop(cfg))) { |
| 1984 | prev = cfg; |
| 1985 | cfg = cfg->_idx >= new_counter ? cfg->in(2) : idom(cfg); |
| 1986 | } |
| 1987 | // If the use occurs after merging several exits from the loop, then |
| 1988 | // old value must have dominated all those exits. Since the same old |
| 1989 | // value was used on all those exits we did not need a Phi at this |
| 1990 | // merge point. NOW we do need a Phi here. Each loop exit value |
| 1991 | // is now merged with the peeled body exit; each exit gets its own |
| 1992 | // private Phi and those Phis need to be merged here. |
| 1993 | Node *phi; |
| 1994 | if( prev->is_Region() ) { |
| 1995 | if( idx == 0 ) { // Updating control edge? |
| 1996 | phi = prev; // Just use existing control |
| 1997 | } else { // Else need a new Phi |
| 1998 | phi = PhiNode::make( prev, old ); |
| 1999 | // Now recursively fix up the new uses of old! |
| 2000 | for( uint i = 1; i < prev->req(); i++ ) { |
| 2001 | worklist.push(phi); // Onto worklist once for each 'old' input |
| 2002 | } |
| 2003 | } |
| 2004 | } else { |
| 2005 | // Get new RegionNode merging old and new loop exits |
| 2006 | prev = old_new[prev->_idx]; |
| 2007 | assert( prev, "just made this in step 7" )do { if (!(prev)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2007, "assert(" "prev" ") failed", "just made this in step 7" ); ::breakpoint(); } } while (0); |
| 2008 | if( idx == 0) { // Updating control edge? |
| 2009 | phi = prev; // Just use existing control |
| 2010 | } else { // Else need a new Phi |
| 2011 | // Make a new Phi merging data values properly |
| 2012 | phi = PhiNode::make( prev, old ); |
| 2013 | phi->set_req( 1, nnn ); |
| 2014 | } |
| 2015 | } |
| 2016 | // If inserting a new Phi, check for prior hits |
| 2017 | if( idx != 0 ) { |
| 2018 | Node *hit = _igvn.hash_find_insert(phi); |
| 2019 | if( hit == NULL__null ) { |
| 2020 | _igvn.register_new_node_with_optimizer(phi); // Register new phi |
| 2021 | } else { // or |
| 2022 | // Remove the new phi from the graph and use the hit |
| 2023 | _igvn.remove_dead_node(phi); |
| 2024 | phi = hit; // Use existing phi |
| 2025 | } |
| 2026 | set_ctrl(phi, prev); |
| 2027 | } |
| 2028 | // Make 'use' use the Phi instead of the old loop body exit value |
| 2029 | _igvn.replace_input_of(use, idx, phi); |
| 2030 | if( use->_idx >= new_counter ) { // If updating new phis |
| 2031 | // Not needed for correctness, but prevents a weak assert |
| 2032 | // in AddPNode from tripping (when we end up with different |
| 2033 | // base & derived Phis that will become the same after |
| 2034 | // IGVN does CSE). |
| 2035 | Node *hit = _igvn.hash_find_insert(use); |
| 2036 | if( hit ) // Go ahead and re-hash for hits. |
| 2037 | _igvn.replace_node( use, hit ); |
| 2038 | } |
| 2039 | |
| 2040 | // If 'use' was in the loop-exit block, it now needs to be sunk |
| 2041 | // below the post-loop merge point. |
| 2042 | sink_use( use, prev ); |
| 2043 | } |
| 2044 | } |
| 2045 | } |
| 2046 | |
| 2047 | static void clone_outer_loop_helper(Node* n, const IdealLoopTree *loop, const IdealLoopTree* outer_loop, |
| 2048 | const Node_List &old_new, Unique_Node_List& wq, PhaseIdealLoop* phase, |
| 2049 | bool check_old_new) { |
| 2050 | for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
| 2051 | Node* u = n->fast_out(j); |
| 2052 | assert(check_old_new || old_new[u->_idx] == NULL, "shouldn't have been cloned")do { if (!(check_old_new || old_new[u->_idx] == __null)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2052, "assert(" "check_old_new || old_new[u->_idx] == __null" ") failed", "shouldn't have been cloned"); ::breakpoint(); } } while (0); |
| 2053 | if (!u->is_CFG() && (!check_old_new || old_new[u->_idx] == NULL__null)) { |
| 2054 | Node* c = phase->get_ctrl(u); |
| 2055 | IdealLoopTree* u_loop = phase->get_loop(c); |
| 2056 | assert(!loop->is_member(u_loop), "can be in outer loop or out of both loops only")do { if (!(!loop->is_member(u_loop))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2056, "assert(" "!loop->is_member(u_loop)" ") failed", "can be in outer loop or out of both loops only" ); ::breakpoint(); } } while (0); |
| 2057 | if (outer_loop->is_member(u_loop) || |
| 2058 | // nodes pinned with control in the outer loop but not referenced from the safepoint must be moved out of |
| 2059 | // the outer loop too |
| 2060 | (u->in(0) != NULL__null && outer_loop->is_member(phase->get_loop(u->in(0))))) { |
| 2061 | wq.push(u); |
| 2062 | } |
| 2063 | } |
| 2064 | } |
| 2065 | } |
| 2066 | |
| 2067 | void PhaseIdealLoop::clone_outer_loop(LoopNode* head, CloneLoopMode mode, IdealLoopTree *loop, |
| 2068 | IdealLoopTree* outer_loop, int dd, Node_List &old_new, |
| 2069 | Node_List& extra_data_nodes) { |
| 2070 | if (head->is_strip_mined() && mode != IgnoreStripMined) { |
| 2071 | CountedLoopNode* cl = head->as_CountedLoop(); |
| 2072 | Node* l = cl->outer_loop(); |
| 2073 | Node* tail = cl->outer_loop_tail(); |
| 2074 | IfNode* le = cl->outer_loop_end(); |
| 2075 | Node* sfpt = cl->outer_safepoint(); |
| 2076 | CountedLoopEndNode* cle = cl->loopexit(); |
| 2077 | CountedLoopNode* new_cl = old_new[cl->_idx]->as_CountedLoop(); |
| 2078 | CountedLoopEndNode* new_cle = new_cl->as_CountedLoop()->loopexit_or_null(); |
| 2079 | Node* cle_out = cle->proj_out(false); |
| 2080 | |
| 2081 | Node* new_sfpt = NULL__null; |
| 2082 | Node* new_cle_out = cle_out->clone(); |
| 2083 | old_new.map(cle_out->_idx, new_cle_out); |
| 2084 | if (mode == CloneIncludesStripMined) { |
| 2085 | // clone outer loop body |
| 2086 | Node* new_l = l->clone(); |
| 2087 | Node* new_tail = tail->clone(); |
| 2088 | IfNode* new_le = le->clone()->as_If(); |
| 2089 | new_sfpt = sfpt->clone(); |
| 2090 | |
| 2091 | set_loop(new_l, outer_loop->_parent); |
| 2092 | set_idom(new_l, new_l->in(LoopNode::EntryControl), dd); |
| 2093 | set_loop(new_cle_out, outer_loop->_parent); |
| 2094 | set_idom(new_cle_out, new_cle, dd); |
| 2095 | set_loop(new_sfpt, outer_loop->_parent); |
| 2096 | set_idom(new_sfpt, new_cle_out, dd); |
| 2097 | set_loop(new_le, outer_loop->_parent); |
| 2098 | set_idom(new_le, new_sfpt, dd); |
| 2099 | set_loop(new_tail, outer_loop->_parent); |
| 2100 | set_idom(new_tail, new_le, dd); |
| 2101 | set_idom(new_cl, new_l, dd); |
| 2102 | |
| 2103 | old_new.map(l->_idx, new_l); |
| 2104 | old_new.map(tail->_idx, new_tail); |
| 2105 | old_new.map(le->_idx, new_le); |
| 2106 | old_new.map(sfpt->_idx, new_sfpt); |
| 2107 | |
| 2108 | new_l->set_req(LoopNode::LoopBackControl, new_tail); |
| 2109 | new_l->set_req(0, new_l); |
| 2110 | new_tail->set_req(0, new_le); |
| 2111 | new_le->set_req(0, new_sfpt); |
| 2112 | new_sfpt->set_req(0, new_cle_out); |
| 2113 | new_cle_out->set_req(0, new_cle); |
| 2114 | new_cl->set_req(LoopNode::EntryControl, new_l); |
| 2115 | |
| 2116 | _igvn.register_new_node_with_optimizer(new_l); |
| 2117 | _igvn.register_new_node_with_optimizer(new_tail); |
| 2118 | _igvn.register_new_node_with_optimizer(new_le); |
| 2119 | } else { |
| 2120 | Node *newhead = old_new[loop->_head->_idx]; |
| 2121 | newhead->as_Loop()->clear_strip_mined(); |
| 2122 | _igvn.replace_input_of(newhead, LoopNode::EntryControl, newhead->in(LoopNode::EntryControl)->in(LoopNode::EntryControl)); |
| 2123 | set_idom(newhead, newhead->in(LoopNode::EntryControl), dd); |
| 2124 | } |
| 2125 | // Look at data node that were assigned a control in the outer |
| 2126 | // loop: they are kept in the outer loop by the safepoint so start |
| 2127 | // from the safepoint node's inputs. |
| 2128 | IdealLoopTree* outer_loop = get_loop(l); |
| 2129 | Node_Stack stack(2); |
| 2130 | stack.push(sfpt, 1); |
| 2131 | uint new_counter = C->unique(); |
| 2132 | while (stack.size() > 0) { |
| 2133 | Node* n = stack.node(); |
| 2134 | uint i = stack.index(); |
| 2135 | while (i < n->req() && |
| 2136 | (n->in(i) == NULL__null || |
| 2137 | !has_ctrl(n->in(i)) || |
| 2138 | get_loop(get_ctrl(n->in(i))) != outer_loop || |
| 2139 | (old_new[n->in(i)->_idx] != NULL__null && old_new[n->in(i)->_idx]->_idx >= new_counter))) { |
| 2140 | i++; |
| 2141 | } |
| 2142 | if (i < n->req()) { |
| 2143 | stack.set_index(i+1); |
| 2144 | stack.push(n->in(i), 0); |
| 2145 | } else { |
| 2146 | assert(old_new[n->_idx] == NULL || n == sfpt || old_new[n->_idx]->_idx < new_counter, "no clone yet")do { if (!(old_new[n->_idx] == __null || n == sfpt || old_new [n->_idx]->_idx < new_counter)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2146, "assert(" "old_new[n->_idx] == __null || n == sfpt || old_new[n->_idx]->_idx < new_counter" ") failed", "no clone yet"); ::breakpoint(); } } while (0); |
| 2147 | Node* m = n == sfpt ? new_sfpt : n->clone(); |
| 2148 | if (m != NULL__null) { |
| 2149 | for (uint i = 0; i < n->req(); i++) { |
| 2150 | if (m->in(i) != NULL__null && old_new[m->in(i)->_idx] != NULL__null) { |
| 2151 | m->set_req(i, old_new[m->in(i)->_idx]); |
| 2152 | } |
| 2153 | } |
| 2154 | } else { |
| 2155 | assert(n == sfpt && mode != CloneIncludesStripMined, "where's the safepoint clone?")do { if (!(n == sfpt && mode != CloneIncludesStripMined )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2155, "assert(" "n == sfpt && mode != CloneIncludesStripMined" ") failed", "where's the safepoint clone?"); ::breakpoint(); } } while (0); |
| 2156 | } |
| 2157 | if (n != sfpt) { |
| 2158 | extra_data_nodes.push(n); |
| 2159 | _igvn.register_new_node_with_optimizer(m); |
| 2160 | assert(get_ctrl(n) == cle_out, "what other control?")do { if (!(get_ctrl(n) == cle_out)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2160, "assert(" "get_ctrl(n) == cle_out" ") failed", "what other control?" ); ::breakpoint(); } } while (0); |
| 2161 | set_ctrl(m, new_cle_out); |
| 2162 | old_new.map(n->_idx, m); |
| 2163 | } |
| 2164 | stack.pop(); |
| 2165 | } |
| 2166 | } |
| 2167 | if (mode == CloneIncludesStripMined) { |
| 2168 | _igvn.register_new_node_with_optimizer(new_sfpt); |
| 2169 | _igvn.register_new_node_with_optimizer(new_cle_out); |
| 2170 | } |
| 2171 | // Some other transformation may have pessimistically assign some |
| 2172 | // data nodes to the outer loop. Set their control so they are out |
| 2173 | // of the outer loop. |
| 2174 | ResourceMark rm; |
| 2175 | Unique_Node_List wq; |
| 2176 | for (uint i = 0; i < extra_data_nodes.size(); i++) { |
| 2177 | Node* old = extra_data_nodes.at(i); |
| 2178 | clone_outer_loop_helper(old, loop, outer_loop, old_new, wq, this, true); |
| 2179 | } |
| 2180 | |
| 2181 | Node* inner_out = sfpt->in(0); |
| 2182 | if (inner_out->outcnt() > 1) { |
| 2183 | clone_outer_loop_helper(inner_out, loop, outer_loop, old_new, wq, this, true); |
| 2184 | } |
| 2185 | |
| 2186 | Node* new_ctrl = cl->outer_loop_exit(); |
| 2187 | assert(get_loop(new_ctrl) != outer_loop, "must be out of the loop nest")do { if (!(get_loop(new_ctrl) != outer_loop)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2187, "assert(" "get_loop(new_ctrl) != outer_loop" ") failed" , "must be out of the loop nest"); ::breakpoint(); } } while ( 0); |
| 2188 | for (uint i = 0; i < wq.size(); i++) { |
| 2189 | Node* n = wq.at(i); |
| 2190 | set_ctrl(n, new_ctrl); |
| 2191 | if (n->in(0) != NULL__null) { |
| 2192 | _igvn.replace_input_of(n, 0, new_ctrl); |
| 2193 | } |
| 2194 | clone_outer_loop_helper(n, loop, outer_loop, old_new, wq, this, false); |
| 2195 | } |
| 2196 | } else { |
| 2197 | Node *newhead = old_new[loop->_head->_idx]; |
| 2198 | set_idom(newhead, newhead->in(LoopNode::EntryControl), dd); |
| 2199 | } |
| 2200 | } |
| 2201 | |
| 2202 | //------------------------------clone_loop------------------------------------- |
| 2203 | // |
| 2204 | // C L O N E A L O O P B O D Y |
| 2205 | // |
| 2206 | // This is the basic building block of the loop optimizations. It clones an |
| 2207 | // entire loop body. It makes an old_new loop body mapping; with this mapping |
| 2208 | // you can find the new-loop equivalent to an old-loop node. All new-loop |
| 2209 | // nodes are exactly equal to their old-loop counterparts, all edges are the |
| 2210 | // same. All exits from the old-loop now have a RegionNode that merges the |
| 2211 | // equivalent new-loop path. This is true even for the normal "loop-exit" |
| 2212 | // condition. All uses of loop-invariant old-loop values now come from (one |
| 2213 | // or more) Phis that merge their new-loop equivalents. |
| 2214 | // |
| 2215 | // This operation leaves the graph in an illegal state: there are two valid |
| 2216 | // control edges coming from the loop pre-header to both loop bodies. I'll |
| 2217 | // definitely have to hack the graph after running this transform. |
| 2218 | // |
| 2219 | // From this building block I will further edit edges to perform loop peeling |
| 2220 | // or loop unrolling or iteration splitting (Range-Check-Elimination), etc. |
| 2221 | // |
| 2222 | // Parameter side_by_size_idom: |
| 2223 | // When side_by_size_idom is NULL, the dominator tree is constructed for |
| 2224 | // the clone loop to dominate the original. Used in construction of |
| 2225 | // pre-main-post loop sequence. |
| 2226 | // When nonnull, the clone and original are side-by-side, both are |
| 2227 | // dominated by the side_by_side_idom node. Used in construction of |
| 2228 | // unswitched loops. |
| 2229 | void PhaseIdealLoop::clone_loop( IdealLoopTree *loop, Node_List &old_new, int dd, |
| 2230 | CloneLoopMode mode, Node* side_by_side_idom) { |
| 2231 | |
| 2232 | LoopNode* head = loop->_head->as_Loop(); |
| 2233 | head->verify_strip_mined(1); |
| 2234 | |
| 2235 | if (C->do_vector_loop() && PrintOpto) { |
| 2236 | const char* mname = C->method()->name()->as_quoted_ascii(); |
| 2237 | if (mname != NULL__null) { |
| 2238 | tty->print("PhaseIdealLoop::clone_loop: for vectorize method %s\n", mname); |
| 2239 | } |
| 2240 | } |
| 2241 | |
| 2242 | CloneMap& cm = C->clone_map(); |
| 2243 | Dict* dict = cm.dict(); |
Value stored to 'dict' during its initialization is never read | |
| 2244 | if (C->do_vector_loop()) { |
| 2245 | cm.set_clone_idx(cm.max_gen()+1); |
| 2246 | #ifndef PRODUCT |
| 2247 | if (PrintOpto) { |
| 2248 | tty->print_cr("PhaseIdealLoop::clone_loop: _clone_idx %d", cm.clone_idx()); |
| 2249 | loop->dump_head(); |
| 2250 | } |
| 2251 | #endif |
| 2252 | } |
| 2253 | |
| 2254 | // Step 1: Clone the loop body. Make the old->new mapping. |
| 2255 | uint i; |
| 2256 | for (i = 0; i < loop->_body.size(); i++) { |
| 2257 | Node* old = loop->_body.at(i); |
| 2258 | Node* nnn = old->clone(); |
| 2259 | old_new.map(old->_idx, nnn); |
| 2260 | if (old->is_reduction()) { |
| 2261 | // Reduction flag is not copied by default. Copy it here when cloning the entire loop body. |
| 2262 | nnn->add_flag(Node::Flag_is_reduction); |
| 2263 | } |
| 2264 | if (C->do_vector_loop()) { |
| 2265 | cm.verify_insert_and_clone(old, nnn, cm.clone_idx()); |
| 2266 | } |
| 2267 | _igvn.register_new_node_with_optimizer(nnn); |
| 2268 | } |
| 2269 | |
| 2270 | IdealLoopTree* outer_loop = (head->is_strip_mined() && mode != IgnoreStripMined) ? get_loop(head->as_CountedLoop()->outer_loop()) : loop; |
| 2271 | |
| 2272 | // Step 2: Fix the edges in the new body. If the old input is outside the |
| 2273 | // loop use it. If the old input is INside the loop, use the corresponding |
| 2274 | // new node instead. |
| 2275 | for( i = 0; i < loop->_body.size(); i++ ) { |
| 2276 | Node *old = loop->_body.at(i); |
| 2277 | Node *nnn = old_new[old->_idx]; |
| 2278 | // Fix CFG/Loop controlling the new node |
| 2279 | if (has_ctrl(old)) { |
| 2280 | set_ctrl(nnn, old_new[get_ctrl(old)->_idx]); |
| 2281 | } else { |
| 2282 | set_loop(nnn, outer_loop->_parent); |
| 2283 | if (old->outcnt() > 0) { |
| 2284 | set_idom( nnn, old_new[idom(old)->_idx], dd ); |
| 2285 | } |
| 2286 | } |
| 2287 | // Correct edges to the new node |
| 2288 | for( uint j = 0; j < nnn->req(); j++ ) { |
| 2289 | Node *n = nnn->in(j); |
| 2290 | if( n ) { |
| 2291 | IdealLoopTree *old_in_loop = get_loop( has_ctrl(n) ? get_ctrl(n) : n ); |
| 2292 | if( loop->is_member( old_in_loop ) ) |
| 2293 | nnn->set_req(j, old_new[n->_idx]); |
| 2294 | } |
| 2295 | } |
| 2296 | _igvn.hash_find_insert(nnn); |
| 2297 | } |
| 2298 | |
| 2299 | Node_List extra_data_nodes; // data nodes in the outer strip mined loop |
| 2300 | clone_outer_loop(head, mode, loop, outer_loop, dd, old_new, extra_data_nodes); |
| 2301 | |
| 2302 | // Step 3: Now fix control uses. Loop varying control uses have already |
| 2303 | // been fixed up (as part of all input edges in Step 2). Loop invariant |
| 2304 | // control uses must be either an IfFalse or an IfTrue. Make a merge |
| 2305 | // point to merge the old and new IfFalse/IfTrue nodes; make the use |
| 2306 | // refer to this. |
| 2307 | Node_List worklist; |
| 2308 | uint new_counter = C->unique(); |
| 2309 | for( i = 0; i < loop->_body.size(); i++ ) { |
| 2310 | Node* old = loop->_body.at(i); |
| 2311 | if( !old->is_CFG() ) continue; |
| 2312 | |
| 2313 | // Copy uses to a worklist, so I can munge the def-use info |
| 2314 | // with impunity. |
| 2315 | for (DUIterator_Fast jmax, j = old->fast_outs(jmax); j < jmax; j++) |
| 2316 | worklist.push(old->fast_out(j)); |
| 2317 | |
| 2318 | while( worklist.size() ) { // Visit all uses |
| 2319 | Node *use = worklist.pop(); |
| 2320 | if (!has_node(use)) continue; // Ignore dead nodes |
| 2321 | IdealLoopTree *use_loop = get_loop( has_ctrl(use) ? get_ctrl(use) : use ); |
| 2322 | if( !loop->is_member( use_loop ) && use->is_CFG() ) { |
| 2323 | // Both OLD and USE are CFG nodes here. |
| 2324 | assert( use->is_Proj(), "" )do { if (!(use->is_Proj())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2324, "assert(" "use->is_Proj()" ") failed", ""); ::breakpoint (); } } while (0); |
| 2325 | Node* nnn = old_new[old->_idx]; |
| 2326 | |
| 2327 | Node* newuse = NULL__null; |
| 2328 | if (head->is_strip_mined() && mode != IgnoreStripMined) { |
| 2329 | CountedLoopNode* cl = head->as_CountedLoop(); |
| 2330 | CountedLoopEndNode* cle = cl->loopexit(); |
| 2331 | Node* cle_out = cle->proj_out_or_null(false); |
| 2332 | if (use == cle_out) { |
| 2333 | IfNode* le = cl->outer_loop_end(); |
| 2334 | use = le->proj_out(false); |
| 2335 | use_loop = get_loop(use); |
| 2336 | if (mode == CloneIncludesStripMined) { |
| 2337 | nnn = old_new[le->_idx]; |
| 2338 | } else { |
| 2339 | newuse = old_new[cle_out->_idx]; |
| 2340 | } |
| 2341 | } |
| 2342 | } |
| 2343 | if (newuse == NULL__null) { |
| 2344 | newuse = use->clone(); |
| 2345 | } |
| 2346 | |
| 2347 | // Clone the loop exit control projection |
| 2348 | if (C->do_vector_loop()) { |
| 2349 | cm.verify_insert_and_clone(use, newuse, cm.clone_idx()); |
| 2350 | } |
| 2351 | newuse->set_req(0,nnn); |
| 2352 | _igvn.register_new_node_with_optimizer(newuse); |
| 2353 | set_loop(newuse, use_loop); |
| 2354 | set_idom(newuse, nnn, dom_depth(nnn) + 1 ); |
| 2355 | |
| 2356 | // We need a Region to merge the exit from the peeled body and the |
| 2357 | // exit from the old loop body. |
| 2358 | RegionNode *r = new RegionNode(3); |
| 2359 | // Map the old use to the new merge point |
| 2360 | old_new.map( use->_idx, r ); |
| 2361 | uint dd_r = MIN2(dom_depth(newuse),dom_depth(use)); |
| 2362 | assert( dd_r >= dom_depth(dom_lca(newuse,use)), "" )do { if (!(dd_r >= dom_depth(dom_lca(newuse,use)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2362, "assert(" "dd_r >= dom_depth(dom_lca(newuse,use))" ") failed", ""); ::breakpoint(); } } while (0); |
| 2363 | |
| 2364 | // The original user of 'use' uses 'r' instead. |
| 2365 | for (DUIterator_Last lmin, l = use->last_outs(lmin); l >= lmin;) { |
| 2366 | Node* useuse = use->last_out(l); |
| 2367 | _igvn.rehash_node_delayed(useuse); |
| 2368 | uint uses_found = 0; |
| 2369 | if( useuse->in(0) == use ) { |
| 2370 | useuse->set_req(0, r); |
| 2371 | uses_found++; |
| 2372 | if( useuse->is_CFG() ) { |
| 2373 | // This is not a dom_depth > dd_r because when new |
| 2374 | // control flow is constructed by a loop opt, a node and |
| 2375 | // its dominator can end up at the same dom_depth |
| 2376 | assert(dom_depth(useuse) >= dd_r, "")do { if (!(dom_depth(useuse) >= dd_r)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2376, "assert(" "dom_depth(useuse) >= dd_r" ") failed", "" ); ::breakpoint(); } } while (0); |
| 2377 | set_idom(useuse, r, dom_depth(useuse)); |
| 2378 | } |
| 2379 | } |
| 2380 | for( uint k = 1; k < useuse->req(); k++ ) { |
| 2381 | if( useuse->in(k) == use ) { |
| 2382 | useuse->set_req(k, r); |
| 2383 | uses_found++; |
| 2384 | if (useuse->is_Loop() && k == LoopNode::EntryControl) { |
| 2385 | // This is not a dom_depth > dd_r because when new |
| 2386 | // control flow is constructed by a loop opt, a node |
| 2387 | // and its dominator can end up at the same dom_depth |
| 2388 | assert(dom_depth(useuse) >= dd_r , "")do { if (!(dom_depth(useuse) >= dd_r)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2388, "assert(" "dom_depth(useuse) >= dd_r" ") failed", "" ); ::breakpoint(); } } while (0); |
| 2389 | set_idom(useuse, r, dom_depth(useuse)); |
| 2390 | } |
| 2391 | } |
| 2392 | } |
| 2393 | l -= uses_found; // we deleted 1 or more copies of this edge |
| 2394 | } |
| 2395 | |
| 2396 | // Now finish up 'r' |
| 2397 | r->set_req( 1, newuse ); |
| 2398 | r->set_req( 2, use ); |
| 2399 | _igvn.register_new_node_with_optimizer(r); |
| 2400 | set_loop(r, use_loop); |
| 2401 | set_idom(r, !side_by_side_idom ? newuse->in(0) : side_by_side_idom, dd_r); |
| 2402 | } // End of if a loop-exit test |
| 2403 | } |
| 2404 | } |
| 2405 | |
| 2406 | // Step 4: If loop-invariant use is not control, it must be dominated by a |
| 2407 | // loop exit IfFalse/IfTrue. Find "proper" loop exit. Make a Region |
| 2408 | // there if needed. Make a Phi there merging old and new used values. |
| 2409 | Node_List *split_if_set = NULL__null; |
| 2410 | Node_List *split_bool_set = NULL__null; |
| 2411 | Node_List *split_cex_set = NULL__null; |
| 2412 | for( i = 0; i < loop->_body.size(); i++ ) { |
| 2413 | Node* old = loop->_body.at(i); |
| 2414 | clone_loop_handle_data_uses(old, old_new, loop, outer_loop, split_if_set, |
| 2415 | split_bool_set, split_cex_set, worklist, new_counter, |
| 2416 | mode); |
| 2417 | } |
| 2418 | |
| 2419 | for (i = 0; i < extra_data_nodes.size(); i++) { |
| 2420 | Node* old = extra_data_nodes.at(i); |
| 2421 | clone_loop_handle_data_uses(old, old_new, loop, outer_loop, split_if_set, |
| 2422 | split_bool_set, split_cex_set, worklist, new_counter, |
| 2423 | mode); |
| 2424 | } |
| 2425 | |
| 2426 | // Check for IFs that need splitting/cloning. Happens if an IF outside of |
| 2427 | // the loop uses a condition set in the loop. The original IF probably |
| 2428 | // takes control from one or more OLD Regions (which in turn get from NEW |
| 2429 | // Regions). In any case, there will be a set of Phis for each merge point |
| 2430 | // from the IF up to where the original BOOL def exists the loop. |
| 2431 | if (split_if_set) { |
| 2432 | while (split_if_set->size()) { |
| 2433 | Node *iff = split_if_set->pop(); |
| 2434 | if (iff->in(1)->is_Phi()) { |
| 2435 | Node *b = clone_iff(iff->in(1)->as_Phi(), loop); |
| 2436 | _igvn.replace_input_of(iff, 1, b); |
| 2437 | } |
| 2438 | } |
| 2439 | } |
| 2440 | if (split_bool_set) { |
| 2441 | while (split_bool_set->size()) { |
| 2442 | Node *b = split_bool_set->pop(); |
| 2443 | Node *phi = b->in(1); |
| 2444 | assert(phi->is_Phi(), "")do { if (!(phi->is_Phi())) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2444, "assert(" "phi->is_Phi()" ") failed", ""); ::breakpoint (); } } while (0); |
| 2445 | CmpNode *cmp = clone_bool((PhiNode*)phi, loop); |
| 2446 | _igvn.replace_input_of(b, 1, cmp); |
| 2447 | } |
| 2448 | } |
| 2449 | if (split_cex_set) { |
| 2450 | while (split_cex_set->size()) { |
| 2451 | Node *b = split_cex_set->pop(); |
| 2452 | assert(b->in(0)->is_Region(), "")do { if (!(b->in(0)->is_Region())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2452, "assert(" "b->in(0)->is_Region()" ") failed", "" ); ::breakpoint(); } } while (0); |
| 2453 | assert(b->in(1)->is_Phi(), "")do { if (!(b->in(1)->is_Phi())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2453, "assert(" "b->in(1)->is_Phi()" ") failed", ""); ::breakpoint(); } } while (0); |
| 2454 | assert(b->in(0)->in(0) == b->in(1)->in(0), "")do { if (!(b->in(0)->in(0) == b->in(1)->in(0))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2454, "assert(" "b->in(0)->in(0) == b->in(1)->in(0)" ") failed", ""); ::breakpoint(); } } while (0); |
| 2455 | split_up(b, b->in(0), NULL__null); |
| 2456 | } |
| 2457 | } |
| 2458 | |
| 2459 | } |
| 2460 | |
| 2461 | |
| 2462 | //---------------------- stride_of_possible_iv ------------------------------------- |
| 2463 | // Looks for an iff/bool/comp with one operand of the compare |
| 2464 | // being a cycle involving an add and a phi, |
| 2465 | // with an optional truncation (left-shift followed by a right-shift) |
| 2466 | // of the add. Returns zero if not an iv. |
| 2467 | int PhaseIdealLoop::stride_of_possible_iv(Node* iff) { |
| 2468 | Node* trunc1 = NULL__null; |
| 2469 | Node* trunc2 = NULL__null; |
| 2470 | const TypeInteger* ttype = NULL__null; |
| 2471 | if (!iff->is_If() || iff->in(1) == NULL__null || !iff->in(1)->is_Bool()) { |
| 2472 | return 0; |
| 2473 | } |
| 2474 | BoolNode* bl = iff->in(1)->as_Bool(); |
| 2475 | Node* cmp = bl->in(1); |
| 2476 | if (!cmp || (cmp->Opcode() != Op_CmpI && cmp->Opcode() != Op_CmpU)) { |
| 2477 | return 0; |
| 2478 | } |
| 2479 | // Must have an invariant operand |
| 2480 | if (is_member(get_loop(iff), get_ctrl(cmp->in(2)))) { |
| 2481 | return 0; |
| 2482 | } |
| 2483 | Node* add2 = NULL__null; |
| 2484 | Node* cmp1 = cmp->in(1); |
| 2485 | if (cmp1->is_Phi()) { |
| 2486 | // (If (Bool (CmpX phi:(Phi ...(Optional-trunc(AddI phi add2))) ))) |
| 2487 | Node* phi = cmp1; |
| 2488 | for (uint i = 1; i < phi->req(); i++) { |
| 2489 | Node* in = phi->in(i); |
| 2490 | Node* add = CountedLoopNode::match_incr_with_optional_truncation(in, |
| 2491 | &trunc1, &trunc2, &ttype, T_INT); |
| 2492 | if (add && add->in(1) == phi) { |
| 2493 | add2 = add->in(2); |
| 2494 | break; |
| 2495 | } |
| 2496 | } |
| 2497 | } else { |
| 2498 | // (If (Bool (CmpX addtrunc:(Optional-trunc((AddI (Phi ...addtrunc...) add2)) ))) |
| 2499 | Node* addtrunc = cmp1; |
| 2500 | Node* add = CountedLoopNode::match_incr_with_optional_truncation(addtrunc, |
| 2501 | &trunc1, &trunc2, &ttype, T_INT); |
| 2502 | if (add && add->in(1)->is_Phi()) { |
| 2503 | Node* phi = add->in(1); |
| 2504 | for (uint i = 1; i < phi->req(); i++) { |
| 2505 | if (phi->in(i) == addtrunc) { |
| 2506 | add2 = add->in(2); |
| 2507 | break; |
| 2508 | } |
| 2509 | } |
| 2510 | } |
| 2511 | } |
| 2512 | if (add2 != NULL__null) { |
| 2513 | const TypeInt* add2t = _igvn.type(add2)->is_int(); |
| 2514 | if (add2t->is_con()) { |
| 2515 | return add2t->get_con(); |
| 2516 | } |
| 2517 | } |
| 2518 | return 0; |
| 2519 | } |
| 2520 | |
| 2521 | |
| 2522 | //---------------------- stay_in_loop ------------------------------------- |
| 2523 | // Return the (unique) control output node that's in the loop (if it exists.) |
| 2524 | Node* PhaseIdealLoop::stay_in_loop( Node* n, IdealLoopTree *loop) { |
| 2525 | Node* unique = NULL__null; |
| 2526 | if (!n) return NULL__null; |
| 2527 | for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
| 2528 | Node* use = n->fast_out(i); |
| 2529 | if (!has_ctrl(use) && loop->is_member(get_loop(use))) { |
| 2530 | if (unique != NULL__null) { |
| 2531 | return NULL__null; |
| 2532 | } |
| 2533 | unique = use; |
| 2534 | } |
| 2535 | } |
| 2536 | return unique; |
| 2537 | } |
| 2538 | |
| 2539 | //------------------------------ register_node ------------------------------------- |
| 2540 | // Utility to register node "n" with PhaseIdealLoop |
| 2541 | void PhaseIdealLoop::register_node(Node* n, IdealLoopTree *loop, Node* pred, int ddepth) { |
| 2542 | _igvn.register_new_node_with_optimizer(n); |
| 2543 | loop->_body.push(n); |
| 2544 | if (n->is_CFG()) { |
| 2545 | set_loop(n, loop); |
| 2546 | set_idom(n, pred, ddepth); |
| 2547 | } else { |
| 2548 | set_ctrl(n, pred); |
| 2549 | } |
| 2550 | } |
| 2551 | |
| 2552 | //------------------------------ proj_clone ------------------------------------- |
| 2553 | // Utility to create an if-projection |
| 2554 | ProjNode* PhaseIdealLoop::proj_clone(ProjNode* p, IfNode* iff) { |
| 2555 | ProjNode* c = p->clone()->as_Proj(); |
| 2556 | c->set_req(0, iff); |
| 2557 | return c; |
| 2558 | } |
| 2559 | |
| 2560 | //------------------------------ short_circuit_if ------------------------------------- |
| 2561 | // Force the iff control output to be the live_proj |
| 2562 | Node* PhaseIdealLoop::short_circuit_if(IfNode* iff, ProjNode* live_proj) { |
| 2563 | guarantee(live_proj != NULL, "null projection")do { if (!(live_proj != __null)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2563, "guarantee(" "live_proj != NULL" ") failed", "null projection" ); ::breakpoint(); } } while (0); |
| 2564 | int proj_con = live_proj->_con; |
| 2565 | assert(proj_con == 0 || proj_con == 1, "false or true projection")do { if (!(proj_con == 0 || proj_con == 1)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2565, "assert(" "proj_con == 0 || proj_con == 1" ") failed" , "false or true projection"); ::breakpoint(); } } while (0); |
| 2566 | Node *con = _igvn.intcon(proj_con); |
| 2567 | set_ctrl(con, C->root()); |
| 2568 | if (iff) { |
| 2569 | iff->set_req(1, con); |
| 2570 | } |
| 2571 | return con; |
| 2572 | } |
| 2573 | |
| 2574 | //------------------------------ insert_if_before_proj ------------------------------------- |
| 2575 | // Insert a new if before an if projection (* - new node) |
| 2576 | // |
| 2577 | // before |
| 2578 | // if(test) |
| 2579 | // / \ |
| 2580 | // v v |
| 2581 | // other-proj proj (arg) |
| 2582 | // |
| 2583 | // after |
| 2584 | // if(test) |
| 2585 | // / \ |
| 2586 | // / v |
| 2587 | // | * proj-clone |
| 2588 | // v | |
| 2589 | // other-proj v |
| 2590 | // * new_if(relop(cmp[IU](left,right))) |
| 2591 | // / \ |
| 2592 | // v v |
| 2593 | // * new-proj proj |
| 2594 | // (returned) |
| 2595 | // |
| 2596 | ProjNode* PhaseIdealLoop::insert_if_before_proj(Node* left, bool Signed, BoolTest::mask relop, Node* right, ProjNode* proj) { |
| 2597 | IfNode* iff = proj->in(0)->as_If(); |
| 2598 | IdealLoopTree *loop = get_loop(proj); |
| 2599 | ProjNode *other_proj = iff->proj_out(!proj->is_IfTrue())->as_Proj(); |
| 2600 | int ddepth = dom_depth(proj); |
| 2601 | |
| 2602 | _igvn.rehash_node_delayed(iff); |
| 2603 | _igvn.rehash_node_delayed(proj); |
| 2604 | |
| 2605 | proj->set_req(0, NULL__null); // temporary disconnect |
| 2606 | ProjNode* proj2 = proj_clone(proj, iff); |
| 2607 | register_node(proj2, loop, iff, ddepth); |
| 2608 | |
| 2609 | Node* cmp = Signed ? (Node*) new CmpINode(left, right) : (Node*) new CmpUNode(left, right); |
| 2610 | register_node(cmp, loop, proj2, ddepth); |
| 2611 | |
| 2612 | BoolNode* bol = new BoolNode(cmp, relop); |
| 2613 | register_node(bol, loop, proj2, ddepth); |
| 2614 | |
| 2615 | int opcode = iff->Opcode(); |
| 2616 | assert(opcode == Op_If || opcode == Op_RangeCheck, "unexpected opcode")do { if (!(opcode == Op_If || opcode == Op_RangeCheck)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2616, "assert(" "opcode == Op_If || opcode == Op_RangeCheck" ") failed", "unexpected opcode"); ::breakpoint(); } } while ( 0); |
| 2617 | IfNode* new_if = (opcode == Op_If) ? new IfNode(proj2, bol, iff->_prob, iff->_fcnt): |
| 2618 | new RangeCheckNode(proj2, bol, iff->_prob, iff->_fcnt); |
| 2619 | register_node(new_if, loop, proj2, ddepth); |
| 2620 | |
| 2621 | proj->set_req(0, new_if); // reattach |
| 2622 | set_idom(proj, new_if, ddepth); |
| 2623 | |
| 2624 | ProjNode* new_exit = proj_clone(other_proj, new_if)->as_Proj(); |
| 2625 | guarantee(new_exit != NULL, "null exit node")do { if (!(new_exit != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2625, "guarantee(" "new_exit != NULL" ") failed", "null exit node" ); ::breakpoint(); } } while (0); |
| 2626 | register_node(new_exit, get_loop(other_proj), new_if, ddepth); |
| 2627 | |
| 2628 | return new_exit; |
| 2629 | } |
| 2630 | |
| 2631 | //------------------------------ insert_region_before_proj ------------------------------------- |
| 2632 | // Insert a region before an if projection (* - new node) |
| 2633 | // |
| 2634 | // before |
| 2635 | // if(test) |
| 2636 | // / | |
| 2637 | // v | |
| 2638 | // proj v |
| 2639 | // other-proj |
| 2640 | // |
| 2641 | // after |
| 2642 | // if(test) |
| 2643 | // / | |
| 2644 | // v | |
| 2645 | // * proj-clone v |
| 2646 | // | other-proj |
| 2647 | // v |
| 2648 | // * new-region |
| 2649 | // | |
| 2650 | // v |
| 2651 | // * dum_if |
| 2652 | // / \ |
| 2653 | // v \ |
| 2654 | // * dum-proj v |
| 2655 | // proj |
| 2656 | // |
| 2657 | RegionNode* PhaseIdealLoop::insert_region_before_proj(ProjNode* proj) { |
| 2658 | IfNode* iff = proj->in(0)->as_If(); |
| 2659 | IdealLoopTree *loop = get_loop(proj); |
| 2660 | ProjNode *other_proj = iff->proj_out(!proj->is_IfTrue())->as_Proj(); |
| 2661 | int ddepth = dom_depth(proj); |
| 2662 | |
| 2663 | _igvn.rehash_node_delayed(iff); |
| 2664 | _igvn.rehash_node_delayed(proj); |
| 2665 | |
| 2666 | proj->set_req(0, NULL__null); // temporary disconnect |
| 2667 | ProjNode* proj2 = proj_clone(proj, iff); |
| 2668 | register_node(proj2, loop, iff, ddepth); |
| 2669 | |
| 2670 | RegionNode* reg = new RegionNode(2); |
| 2671 | reg->set_req(1, proj2); |
| 2672 | register_node(reg, loop, iff, ddepth); |
| 2673 | |
| 2674 | IfNode* dum_if = new IfNode(reg, short_circuit_if(NULL__null, proj), iff->_prob, iff->_fcnt); |
| 2675 | register_node(dum_if, loop, reg, ddepth); |
| 2676 | |
| 2677 | proj->set_req(0, dum_if); // reattach |
| 2678 | set_idom(proj, dum_if, ddepth); |
| 2679 | |
| 2680 | ProjNode* dum_proj = proj_clone(other_proj, dum_if); |
| 2681 | register_node(dum_proj, loop, dum_if, ddepth); |
| 2682 | |
| 2683 | return reg; |
| 2684 | } |
| 2685 | |
| 2686 | //------------------------------ insert_cmpi_loop_exit ------------------------------------- |
| 2687 | // Clone a signed compare loop exit from an unsigned compare and |
| 2688 | // insert it before the unsigned cmp on the stay-in-loop path. |
| 2689 | // All new nodes inserted in the dominator tree between the original |
| 2690 | // if and it's projections. The original if test is replaced with |
| 2691 | // a constant to force the stay-in-loop path. |
| 2692 | // |
| 2693 | // This is done to make sure that the original if and it's projections |
| 2694 | // still dominate the same set of control nodes, that the ctrl() relation |
| 2695 | // from data nodes to them is preserved, and that their loop nesting is |
| 2696 | // preserved. |
| 2697 | // |
| 2698 | // before |
| 2699 | // if(i <u limit) unsigned compare loop exit |
| 2700 | // / | |
| 2701 | // v v |
| 2702 | // exit-proj stay-in-loop-proj |
| 2703 | // |
| 2704 | // after |
| 2705 | // if(stay-in-loop-const) original if |
| 2706 | // / | |
| 2707 | // / v |
| 2708 | // / if(i < limit) new signed test |
| 2709 | // / / | |
| 2710 | // / / v |
| 2711 | // / / if(i <u limit) new cloned unsigned test |
| 2712 | // / / / | |
| 2713 | // v v v | |
| 2714 | // region | |
| 2715 | // | | |
| 2716 | // dum-if | |
| 2717 | // / | | |
| 2718 | // ether | | |
| 2719 | // v v |
| 2720 | // exit-proj stay-in-loop-proj |
| 2721 | // |
| 2722 | IfNode* PhaseIdealLoop::insert_cmpi_loop_exit(IfNode* if_cmpu, IdealLoopTree *loop) { |
| 2723 | const bool Signed = true; |
| 2724 | const bool Unsigned = false; |
| 2725 | |
| 2726 | BoolNode* bol = if_cmpu->in(1)->as_Bool(); |
| 2727 | if (bol->_test._test != BoolTest::lt) return NULL__null; |
| 2728 | CmpNode* cmpu = bol->in(1)->as_Cmp(); |
| 2729 | if (cmpu->Opcode() != Op_CmpU) return NULL__null; |
| 2730 | int stride = stride_of_possible_iv(if_cmpu); |
| 2731 | if (stride == 0) return NULL__null; |
| 2732 | |
| 2733 | Node* lp_proj = stay_in_loop(if_cmpu, loop); |
| 2734 | guarantee(lp_proj != NULL, "null loop node")do { if (!(lp_proj != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2734, "guarantee(" "lp_proj != NULL" ") failed", "null loop node" ); ::breakpoint(); } } while (0); |
| 2735 | |
| 2736 | ProjNode* lp_continue = lp_proj->as_Proj(); |
| 2737 | ProjNode* lp_exit = if_cmpu->proj_out(!lp_continue->is_IfTrue())->as_Proj(); |
| 2738 | if (!lp_exit->is_IfFalse()) { |
| 2739 | // The loop exit condition is (i <u limit) ==> (i >= 0 && i < limit). |
| 2740 | // We therefore can't add a single exit condition. |
| 2741 | return NULL__null; |
| 2742 | } |
| 2743 | // The loop exit condition is !(i <u limit) ==> (i < 0 || i >= limit). |
| 2744 | // Split out the exit condition (i < 0) for stride < 0 or (i >= limit) for stride > 0. |
| 2745 | Node* limit = NULL__null; |
| 2746 | if (stride > 0) { |
| 2747 | limit = cmpu->in(2); |
| 2748 | } else { |
| 2749 | limit = _igvn.makecon(TypeInt::ZERO); |
| 2750 | set_ctrl(limit, C->root()); |
| 2751 | } |
| 2752 | // Create a new region on the exit path |
| 2753 | RegionNode* reg = insert_region_before_proj(lp_exit); |
| 2754 | guarantee(reg != NULL, "null region node")do { if (!(reg != __null)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2754, "guarantee(" "reg != NULL" ") failed", "null region node" ); ::breakpoint(); } } while (0); |
| 2755 | |
| 2756 | // Clone the if-cmpu-true-false using a signed compare |
| 2757 | BoolTest::mask rel_i = stride > 0 ? bol->_test._test : BoolTest::ge; |
| 2758 | ProjNode* cmpi_exit = insert_if_before_proj(cmpu->in(1), Signed, rel_i, limit, lp_continue); |
| 2759 | reg->add_req(cmpi_exit); |
| 2760 | |
| 2761 | // Clone the if-cmpu-true-false |
| 2762 | BoolTest::mask rel_u = bol->_test._test; |
| 2763 | ProjNode* cmpu_exit = insert_if_before_proj(cmpu->in(1), Unsigned, rel_u, cmpu->in(2), lp_continue); |
| 2764 | reg->add_req(cmpu_exit); |
| 2765 | |
| 2766 | // Force original if to stay in loop. |
| 2767 | short_circuit_if(if_cmpu, lp_continue); |
| 2768 | |
| 2769 | return cmpi_exit->in(0)->as_If(); |
| 2770 | } |
| 2771 | |
| 2772 | //------------------------------ remove_cmpi_loop_exit ------------------------------------- |
| 2773 | // Remove a previously inserted signed compare loop exit. |
| 2774 | void PhaseIdealLoop::remove_cmpi_loop_exit(IfNode* if_cmp, IdealLoopTree *loop) { |
| 2775 | Node* lp_proj = stay_in_loop(if_cmp, loop); |
| 2776 | assert(if_cmp->in(1)->in(1)->Opcode() == Op_CmpI &&do { if (!(if_cmp->in(1)->in(1)->Opcode() == Op_CmpI && stay_in_loop(lp_proj, loop)->is_If() && stay_in_loop(lp_proj, loop)->in(1)->in(1)->Opcode() == Op_CmpU)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2778, "assert(" "if_cmp->in(1)->in(1)->Opcode() == Op_CmpI && stay_in_loop(lp_proj, loop)->is_If() && stay_in_loop(lp_proj, loop)->in(1)->in(1)->Opcode() == Op_CmpU" ") failed", "inserted cmpi before cmpu"); ::breakpoint(); } } while (0) |
| 2777 | stay_in_loop(lp_proj, loop)->is_If() &&do { if (!(if_cmp->in(1)->in(1)->Opcode() == Op_CmpI && stay_in_loop(lp_proj, loop)->is_If() && stay_in_loop(lp_proj, loop)->in(1)->in(1)->Opcode() == Op_CmpU)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2778, "assert(" "if_cmp->in(1)->in(1)->Opcode() == Op_CmpI && stay_in_loop(lp_proj, loop)->is_If() && stay_in_loop(lp_proj, loop)->in(1)->in(1)->Opcode() == Op_CmpU" ") failed", "inserted cmpi before cmpu"); ::breakpoint(); } } while (0) |
| 2778 | stay_in_loop(lp_proj, loop)->in(1)->in(1)->Opcode() == Op_CmpU, "inserted cmpi before cmpu")do { if (!(if_cmp->in(1)->in(1)->Opcode() == Op_CmpI && stay_in_loop(lp_proj, loop)->is_If() && stay_in_loop(lp_proj, loop)->in(1)->in(1)->Opcode() == Op_CmpU)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2778, "assert(" "if_cmp->in(1)->in(1)->Opcode() == Op_CmpI && stay_in_loop(lp_proj, loop)->is_If() && stay_in_loop(lp_proj, loop)->in(1)->in(1)->Opcode() == Op_CmpU" ") failed", "inserted cmpi before cmpu"); ::breakpoint(); } } while (0); |
| 2779 | Node *con = _igvn.makecon(lp_proj->is_IfTrue() ? TypeInt::ONE : TypeInt::ZERO); |
| 2780 | set_ctrl(con, C->root()); |
| 2781 | if_cmp->set_req(1, con); |
| 2782 | } |
| 2783 | |
| 2784 | //------------------------------ scheduled_nodelist ------------------------------------- |
| 2785 | // Create a post order schedule of nodes that are in the |
| 2786 | // "member" set. The list is returned in "sched". |
| 2787 | // The first node in "sched" is the loop head, followed by |
| 2788 | // nodes which have no inputs in the "member" set, and then |
| 2789 | // followed by the nodes that have an immediate input dependence |
| 2790 | // on a node in "sched". |
| 2791 | void PhaseIdealLoop::scheduled_nodelist( IdealLoopTree *loop, VectorSet& member, Node_List &sched ) { |
| 2792 | |
| 2793 | assert(member.test(loop->_head->_idx), "loop head must be in member set")do { if (!(member.test(loop->_head->_idx))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2793, "assert(" "member.test(loop->_head->_idx)" ") failed" , "loop head must be in member set"); ::breakpoint(); } } while (0); |
| 2794 | VectorSet visited; |
| 2795 | Node_Stack nstack(loop->_body.size()); |
| 2796 | |
| 2797 | Node* n = loop->_head; // top of stack is cached in "n" |
| 2798 | uint idx = 0; |
| 2799 | visited.set(n->_idx); |
| 2800 | |
| 2801 | // Initially push all with no inputs from within member set |
| 2802 | for(uint i = 0; i < loop->_body.size(); i++ ) { |
| 2803 | Node *elt = loop->_body.at(i); |
| 2804 | if (member.test(elt->_idx)) { |
| 2805 | bool found = false; |
| 2806 | for (uint j = 0; j < elt->req(); j++) { |
| 2807 | Node* def = elt->in(j); |
| 2808 | if (def && member.test(def->_idx) && def != elt) { |
| 2809 | found = true; |
| 2810 | break; |
| 2811 | } |
| 2812 | } |
| 2813 | if (!found && elt != loop->_head) { |
| 2814 | nstack.push(n, idx); |
| 2815 | n = elt; |
| 2816 | assert(!visited.test(n->_idx), "not seen yet")do { if (!(!visited.test(n->_idx))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2816, "assert(" "!visited.test(n->_idx)" ") failed", "not seen yet" ); ::breakpoint(); } } while (0); |
| 2817 | visited.set(n->_idx); |
| 2818 | } |
| 2819 | } |
| 2820 | } |
| 2821 | |
| 2822 | // traverse out's that are in the member set |
| 2823 | while (true) { |
| 2824 | if (idx < n->outcnt()) { |
| 2825 | Node* use = n->raw_out(idx); |
| 2826 | idx++; |
| 2827 | if (!visited.test_set(use->_idx)) { |
| 2828 | if (member.test(use->_idx)) { |
| 2829 | nstack.push(n, idx); |
| 2830 | n = use; |
| 2831 | idx = 0; |
| 2832 | } |
| 2833 | } |
| 2834 | } else { |
| 2835 | // All outputs processed |
| 2836 | sched.push(n); |
| 2837 | if (nstack.is_empty()) break; |
| 2838 | n = nstack.node(); |
| 2839 | idx = nstack.index(); |
| 2840 | nstack.pop(); |
| 2841 | } |
| 2842 | } |
| 2843 | } |
| 2844 | |
| 2845 | |
| 2846 | //------------------------------ has_use_in_set ------------------------------------- |
| 2847 | // Has a use in the vector set |
| 2848 | bool PhaseIdealLoop::has_use_in_set( Node* n, VectorSet& vset ) { |
| 2849 | for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
| 2850 | Node* use = n->fast_out(j); |
| 2851 | if (vset.test(use->_idx)) { |
| 2852 | return true; |
| 2853 | } |
| 2854 | } |
| 2855 | return false; |
| 2856 | } |
| 2857 | |
| 2858 | |
| 2859 | //------------------------------ has_use_internal_to_set ------------------------------------- |
| 2860 | // Has use internal to the vector set (ie. not in a phi at the loop head) |
| 2861 | bool PhaseIdealLoop::has_use_internal_to_set( Node* n, VectorSet& vset, IdealLoopTree *loop ) { |
| 2862 | Node* head = loop->_head; |
| 2863 | for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
| 2864 | Node* use = n->fast_out(j); |
| 2865 | if (vset.test(use->_idx) && !(use->is_Phi() && use->in(0) == head)) { |
| 2866 | return true; |
| 2867 | } |
| 2868 | } |
| 2869 | return false; |
| 2870 | } |
| 2871 | |
| 2872 | |
| 2873 | //------------------------------ clone_for_use_outside_loop ------------------------------------- |
| 2874 | // clone "n" for uses that are outside of loop |
| 2875 | int PhaseIdealLoop::clone_for_use_outside_loop( IdealLoopTree *loop, Node* n, Node_List& worklist ) { |
| 2876 | int cloned = 0; |
| 2877 | assert(worklist.size() == 0, "should be empty")do { if (!(worklist.size() == 0)) { (*g_assert_poison) = 'X'; ; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2877, "assert(" "worklist.size() == 0" ") failed", "should be empty" ); ::breakpoint(); } } while (0); |
| 2878 | for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
| 2879 | Node* use = n->fast_out(j); |
| 2880 | if( !loop->is_member(get_loop(has_ctrl(use) ? get_ctrl(use) : use)) ) { |
| 2881 | worklist.push(use); |
| 2882 | } |
| 2883 | } |
| 2884 | |
| 2885 | if (C->check_node_count(worklist.size() + NodeLimitFudgeFactor, |
| 2886 | "Too many clones required in clone_for_use_outside_loop in partial peeling")) { |
| 2887 | return -1; |
| 2888 | } |
| 2889 | |
| 2890 | while( worklist.size() ) { |
| 2891 | Node *use = worklist.pop(); |
| 2892 | if (!has_node(use) || use->in(0) == C->top()) continue; |
| 2893 | uint j; |
| 2894 | for (j = 0; j < use->req(); j++) { |
| 2895 | if (use->in(j) == n) break; |
| 2896 | } |
| 2897 | assert(j < use->req(), "must be there")do { if (!(j < use->req())) { (*g_assert_poison) = 'X'; ; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2897, "assert(" "j < use->req()" ") failed", "must be there" ); ::breakpoint(); } } while (0); |
| 2898 | |
| 2899 | // clone "n" and insert it between the inputs of "n" and the use outside the loop |
| 2900 | Node* n_clone = n->clone(); |
| 2901 | _igvn.replace_input_of(use, j, n_clone); |
| 2902 | cloned++; |
| 2903 | Node* use_c; |
| 2904 | if (!use->is_Phi()) { |
| 2905 | use_c = has_ctrl(use) ? get_ctrl(use) : use->in(0); |
| 2906 | } else { |
| 2907 | // Use in a phi is considered a use in the associated predecessor block |
| 2908 | use_c = use->in(0)->in(j); |
| 2909 | } |
| 2910 | set_ctrl(n_clone, use_c); |
| 2911 | assert(!loop->is_member(get_loop(use_c)), "should be outside loop")do { if (!(!loop->is_member(get_loop(use_c)))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2911, "assert(" "!loop->is_member(get_loop(use_c))" ") failed" , "should be outside loop"); ::breakpoint(); } } while (0); |
| 2912 | get_loop(use_c)->_body.push(n_clone); |
| 2913 | _igvn.register_new_node_with_optimizer(n_clone); |
| 2914 | #ifndef PRODUCT |
| 2915 | if (TracePartialPeeling) { |
| 2916 | tty->print_cr("loop exit cloning old: %d new: %d newbb: %d", n->_idx, n_clone->_idx, get_ctrl(n_clone)->_idx); |
| 2917 | } |
| 2918 | #endif |
| 2919 | } |
| 2920 | return cloned; |
| 2921 | } |
| 2922 | |
| 2923 | |
| 2924 | //------------------------------ clone_for_special_use_inside_loop ------------------------------------- |
| 2925 | // clone "n" for special uses that are in the not_peeled region. |
| 2926 | // If these def-uses occur in separate blocks, the code generator |
| 2927 | // marks the method as not compilable. For example, if a "BoolNode" |
| 2928 | // is in a different basic block than the "IfNode" that uses it, then |
| 2929 | // the compilation is aborted in the code generator. |
| 2930 | void PhaseIdealLoop::clone_for_special_use_inside_loop( IdealLoopTree *loop, Node* n, |
| 2931 | VectorSet& not_peel, Node_List& sink_list, Node_List& worklist ) { |
| 2932 | if (n->is_Phi() || n->is_Load()) { |
| 2933 | return; |
| 2934 | } |
| 2935 | assert(worklist.size() == 0, "should be empty")do { if (!(worklist.size() == 0)) { (*g_assert_poison) = 'X'; ; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 2935, "assert(" "worklist.size() == 0" ") failed", "should be empty" ); ::breakpoint(); } } while (0); |
| 2936 | for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
| 2937 | Node* use = n->fast_out(j); |
| 2938 | if ( not_peel.test(use->_idx) && |
| 2939 | (use->is_If() || use->is_CMove() || use->is_Bool()) && |
| 2940 | use->in(1) == n) { |
| 2941 | worklist.push(use); |
| 2942 | } |
| 2943 | } |
| 2944 | if (worklist.size() > 0) { |
| 2945 | // clone "n" and insert it between inputs of "n" and the use |
| 2946 | Node* n_clone = n->clone(); |
| 2947 | loop->_body.push(n_clone); |
| 2948 | _igvn.register_new_node_with_optimizer(n_clone); |
| 2949 | set_ctrl(n_clone, get_ctrl(n)); |
| 2950 | sink_list.push(n_clone); |
| 2951 | not_peel.set(n_clone->_idx); |
| 2952 | #ifndef PRODUCT |
| 2953 | if (TracePartialPeeling) { |
| 2954 | tty->print_cr("special not_peeled cloning old: %d new: %d", n->_idx, n_clone->_idx); |
| 2955 | } |
| 2956 | #endif |
| 2957 | while( worklist.size() ) { |
| 2958 | Node *use = worklist.pop(); |
| 2959 | _igvn.rehash_node_delayed(use); |
| 2960 | for (uint j = 1; j < use->req(); j++) { |
| 2961 | if (use->in(j) == n) { |
| 2962 | use->set_req(j, n_clone); |
| 2963 | } |
| 2964 | } |
| 2965 | } |
| 2966 | } |
| 2967 | } |
| 2968 | |
| 2969 | |
| 2970 | //------------------------------ insert_phi_for_loop ------------------------------------- |
| 2971 | // Insert phi(lp_entry_val, back_edge_val) at use->in(idx) for loop lp if phi does not already exist |
| 2972 | void PhaseIdealLoop::insert_phi_for_loop( Node* use, uint idx, Node* lp_entry_val, Node* back_edge_val, LoopNode* lp ) { |
| 2973 | Node *phi = PhiNode::make(lp, back_edge_val); |
| 2974 | phi->set_req(LoopNode::EntryControl, lp_entry_val); |
| 2975 | // Use existing phi if it already exists |
| 2976 | Node *hit = _igvn.hash_find_insert(phi); |
| 2977 | if( hit == NULL__null ) { |
| 2978 | _igvn.register_new_node_with_optimizer(phi); |
| 2979 | set_ctrl(phi, lp); |
| 2980 | } else { |
| 2981 | // Remove the new phi from the graph and use the hit |
| 2982 | _igvn.remove_dead_node(phi); |
| 2983 | phi = hit; |
| 2984 | } |
| 2985 | _igvn.replace_input_of(use, idx, phi); |
| 2986 | } |
| 2987 | |
| 2988 | #ifdef ASSERT1 |
| 2989 | //------------------------------ is_valid_loop_partition ------------------------------------- |
| 2990 | // Validate the loop partition sets: peel and not_peel |
| 2991 | bool PhaseIdealLoop::is_valid_loop_partition( IdealLoopTree *loop, VectorSet& peel, Node_List& peel_list, |
| 2992 | VectorSet& not_peel ) { |
| 2993 | uint i; |
| 2994 | // Check that peel_list entries are in the peel set |
| 2995 | for (i = 0; i < peel_list.size(); i++) { |
| 2996 | if (!peel.test(peel_list.at(i)->_idx)) { |
| 2997 | return false; |
| 2998 | } |
| 2999 | } |
| 3000 | // Check at loop members are in one of peel set or not_peel set |
| 3001 | for (i = 0; i < loop->_body.size(); i++ ) { |
| 3002 | Node *def = loop->_body.at(i); |
| 3003 | uint di = def->_idx; |
| 3004 | // Check that peel set elements are in peel_list |
| 3005 | if (peel.test(di)) { |
| 3006 | if (not_peel.test(di)) { |
| 3007 | return false; |
| 3008 | } |
| 3009 | // Must be in peel_list also |
| 3010 | bool found = false; |
| 3011 | for (uint j = 0; j < peel_list.size(); j++) { |
| 3012 | if (peel_list.at(j)->_idx == di) { |
| 3013 | found = true; |
| 3014 | break; |
| 3015 | } |
| 3016 | } |
| 3017 | if (!found) { |
| 3018 | return false; |
| 3019 | } |
| 3020 | } else if (not_peel.test(di)) { |
| 3021 | if (peel.test(di)) { |
| 3022 | return false; |
| 3023 | } |
| 3024 | } else { |
| 3025 | return false; |
| 3026 | } |
| 3027 | } |
| 3028 | return true; |
| 3029 | } |
| 3030 | |
| 3031 | //------------------------------ is_valid_clone_loop_exit_use ------------------------------------- |
| 3032 | // Ensure a use outside of loop is of the right form |
| 3033 | bool PhaseIdealLoop::is_valid_clone_loop_exit_use( IdealLoopTree *loop, Node* use, uint exit_idx) { |
| 3034 | Node *use_c = has_ctrl(use) ? get_ctrl(use) : use; |
| 3035 | return (use->is_Phi() && |
| 3036 | use_c->is_Region() && use_c->req() == 3 && |
| 3037 | (use_c->in(exit_idx)->Opcode() == Op_IfTrue || |
| 3038 | use_c->in(exit_idx)->Opcode() == Op_IfFalse || |
| 3039 | use_c->in(exit_idx)->Opcode() == Op_JumpProj) && |
| 3040 | loop->is_member( get_loop( use_c->in(exit_idx)->in(0) ) ) ); |
| 3041 | } |
| 3042 | |
| 3043 | //------------------------------ is_valid_clone_loop_form ------------------------------------- |
| 3044 | // Ensure that all uses outside of loop are of the right form |
| 3045 | bool PhaseIdealLoop::is_valid_clone_loop_form( IdealLoopTree *loop, Node_List& peel_list, |
| 3046 | uint orig_exit_idx, uint clone_exit_idx) { |
| 3047 | uint len = peel_list.size(); |
| 3048 | for (uint i = 0; i < len; i++) { |
| 3049 | Node *def = peel_list.at(i); |
| 3050 | |
| 3051 | for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { |
| 3052 | Node *use = def->fast_out(j); |
| 3053 | Node *use_c = has_ctrl(use) ? get_ctrl(use) : use; |
| 3054 | if (!loop->is_member(get_loop(use_c))) { |
| 3055 | // use is not in the loop, check for correct structure |
| 3056 | if (use->in(0) == def) { |
| 3057 | // Okay |
| 3058 | } else if (!is_valid_clone_loop_exit_use(loop, use, orig_exit_idx)) { |
| 3059 | return false; |
| 3060 | } |
| 3061 | } |
| 3062 | } |
| 3063 | } |
| 3064 | return true; |
| 3065 | } |
| 3066 | #endif |
| 3067 | |
| 3068 | //------------------------------ partial_peel ------------------------------------- |
| 3069 | // Partially peel (aka loop rotation) the top portion of a loop (called |
| 3070 | // the peel section below) by cloning it and placing one copy just before |
| 3071 | // the new loop head and the other copy at the bottom of the new loop. |
| 3072 | // |
| 3073 | // before after where it came from |
| 3074 | // |
| 3075 | // stmt1 stmt1 |
| 3076 | // loop: stmt2 clone |
| 3077 | // stmt2 if condA goto exitA clone |
| 3078 | // if condA goto exitA new_loop: new |
| 3079 | // stmt3 stmt3 clone |
| 3080 | // if !condB goto loop if condB goto exitB clone |
| 3081 | // exitB: stmt2 orig |
| 3082 | // stmt4 if !condA goto new_loop orig |
| 3083 | // exitA: goto exitA |
| 3084 | // exitB: |
| 3085 | // stmt4 |
| 3086 | // exitA: |
| 3087 | // |
| 3088 | // Step 1: find the cut point: an exit test on probable |
| 3089 | // induction variable. |
| 3090 | // Step 2: schedule (with cloning) operations in the peel |
| 3091 | // section that can be executed after the cut into |
| 3092 | // the section that is not peeled. This may need |
| 3093 | // to clone operations into exit blocks. For |
| 3094 | // instance, a reference to A[i] in the not-peel |
| 3095 | // section and a reference to B[i] in an exit block |
| 3096 | // may cause a left-shift of i by 2 to be placed |
| 3097 | // in the peel block. This step will clone the left |
| 3098 | // shift into the exit block and sink the left shift |
| 3099 | // from the peel to the not-peel section. |
| 3100 | // Step 3: clone the loop, retarget the control, and insert |
| 3101 | // phis for values that are live across the new loop |
| 3102 | // head. This is very dependent on the graph structure |
| 3103 | // from clone_loop. It creates region nodes for |
| 3104 | // exit control and associated phi nodes for values |
| 3105 | // flow out of the loop through that exit. The region |
| 3106 | // node is dominated by the clone's control projection. |
| 3107 | // So the clone's peel section is placed before the |
| 3108 | // new loop head, and the clone's not-peel section is |
| 3109 | // forms the top part of the new loop. The original |
| 3110 | // peel section forms the tail of the new loop. |
| 3111 | // Step 4: update the dominator tree and recompute the |
| 3112 | // dominator depth. |
| 3113 | // |
| 3114 | // orig |
| 3115 | // |
| 3116 | // stmt1 |
| 3117 | // | |
| 3118 | // v |
| 3119 | // loop predicate |
| 3120 | // | |
| 3121 | // v |
| 3122 | // loop<----+ |
| 3123 | // | | |
| 3124 | // stmt2 | |
| 3125 | // | | |
| 3126 | // v | |
| 3127 | // ifA | |
| 3128 | // / | | |
| 3129 | // v v | |
| 3130 | // false true ^ <-- last_peel |
| 3131 | // / | | |
| 3132 | // / ===|==cut | |
| 3133 | // / stmt3 | <-- first_not_peel |
| 3134 | // / | | |
| 3135 | // | v | |
| 3136 | // v ifB | |
| 3137 | // exitA: / \ | |
| 3138 | // / \ | |
| 3139 | // v v | |
| 3140 | // false true | |
| 3141 | // / \ | |
| 3142 | // / ----+ |
| 3143 | // | |
| 3144 | // v |
| 3145 | // exitB: |
| 3146 | // stmt4 |
| 3147 | // |
| 3148 | // |
| 3149 | // after clone loop |
| 3150 | // |
| 3151 | // stmt1 |
| 3152 | // | |
| 3153 | // v |
| 3154 | // loop predicate |
| 3155 | // / \ |
| 3156 | // clone / \ orig |
| 3157 | // / \ |
| 3158 | // / \ |
| 3159 | // v v |
| 3160 | // +---->loop loop<----+ |
| 3161 | // | | | | |
| 3162 | // | stmt2 stmt2 | |
| 3163 | // | | | | |
| 3164 | // | v v | |
| 3165 | // | ifA ifA | |
| 3166 | // | | \ / | | |
| 3167 | // | v v v v | |
| 3168 | // ^ true false false true ^ <-- last_peel |
| 3169 | // | | ^ \ / | | |
| 3170 | // | cut==|== \ \ / ===|==cut | |
| 3171 | // | stmt3 \ \ / stmt3 | <-- first_not_peel |
| 3172 | // | | dom | | | | |
| 3173 | // | v \ 1v v2 v | |
| 3174 | // | ifB regionA ifB | |
| 3175 | // | / \ | / \ | |
| 3176 | // | / \ v / \ | |
| 3177 | // | v v exitA: v v | |
| 3178 | // | true false false true | |
| 3179 | // | / ^ \ / \ | |
| 3180 | // +---- \ \ / ----+ |
| 3181 | // dom \ / |
| 3182 | // \ 1v v2 |
| 3183 | // regionB |
| 3184 | // | |
| 3185 | // v |
| 3186 | // exitB: |
| 3187 | // stmt4 |
| 3188 | // |
| 3189 | // |
| 3190 | // after partial peel |
| 3191 | // |
| 3192 | // stmt1 |
| 3193 | // | |
| 3194 | // v |
| 3195 | // loop predicate |
| 3196 | // / |
| 3197 | // clone / orig |
| 3198 | // / TOP |
| 3199 | // / \ |
| 3200 | // v v |
| 3201 | // TOP->loop loop----+ |
| 3202 | // | | | |
| 3203 | // stmt2 stmt2 | |
| 3204 | // | | | |
| 3205 | // v v | |
| 3206 | // ifA ifA | |
| 3207 | // | \ / | | |
| 3208 | // v v v v | |
| 3209 | // true false false true | <-- last_peel |
| 3210 | // | ^ \ / +------|---+ |
| 3211 | // +->newloop \ \ / === ==cut | | |
| 3212 | // | stmt3 \ \ / TOP | | |
| 3213 | // | | dom | | stmt3 | | <-- first_not_peel |
| 3214 | // | v \ 1v v2 v | | |
| 3215 | // | ifB regionA ifB ^ v |
| 3216 | // | / \ | / \ | | |
| 3217 | // | / \ v / \ | | |
| 3218 | // | v v exitA: v v | | |
| 3219 | // | true false false true | | |
| 3220 | // | / ^ \ / \ | | |
| 3221 | // | | \ \ / v | | |
| 3222 | // | | dom \ / TOP | | |
| 3223 | // | | \ 1v v2 | | |
| 3224 | // ^ v regionB | | |
| 3225 | // | | | | | |
| 3226 | // | | v ^ v |
| 3227 | // | | exitB: | | |
| 3228 | // | | stmt4 | | |
| 3229 | // | +------------>-----------------+ | |
| 3230 | // | | |
| 3231 | // +-----------------<---------------------+ |
| 3232 | // |
| 3233 | // |
| 3234 | // final graph |
| 3235 | // |
| 3236 | // stmt1 |
| 3237 | // | |
| 3238 | // v |
| 3239 | // loop predicate |
| 3240 | // | |
| 3241 | // v |
| 3242 | // stmt2 clone |
| 3243 | // | |
| 3244 | // v |
| 3245 | // ........> ifA clone |
| 3246 | // : / | |
| 3247 | // dom / | |
| 3248 | // : v v |
| 3249 | // : false true |
| 3250 | // : | | |
| 3251 | // : | v |
| 3252 | // : | newloop<-----+ |
| 3253 | // : | | | |
| 3254 | // : | stmt3 clone | |
| 3255 | // : | | | |
| 3256 | // : | v | |
| 3257 | // : | ifB | |
| 3258 | // : | / \ | |
| 3259 | // : | v v | |
| 3260 | // : | false true | |
| 3261 | // : | | | | |
| 3262 | // : | v stmt2 | |
| 3263 | // : | exitB: | | |
| 3264 | // : | stmt4 v | |
| 3265 | // : | ifA orig | |
| 3266 | // : | / \ | |
| 3267 | // : | / \ | |
| 3268 | // : | v v | |
| 3269 | // : | false true | |
| 3270 | // : | / \ | |
| 3271 | // : v v -----+ |
| 3272 | // RegionA |
| 3273 | // | |
| 3274 | // v |
| 3275 | // exitA |
| 3276 | // |
| 3277 | bool PhaseIdealLoop::partial_peel( IdealLoopTree *loop, Node_List &old_new ) { |
| 3278 | |
| 3279 | assert(!loop->_head->is_CountedLoop(), "Non-counted loop only")do { if (!(!loop->_head->is_CountedLoop())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3279, "assert(" "!loop->_head->is_CountedLoop()" ") failed" , "Non-counted loop only"); ::breakpoint(); } } while (0); |
| 3280 | if (!loop->_head->is_Loop()) { |
| 3281 | return false; |
| 3282 | } |
| 3283 | LoopNode *head = loop->_head->as_Loop(); |
| 3284 | |
| 3285 | if (head->is_partial_peel_loop() || head->partial_peel_has_failed()) { |
| 3286 | return false; |
| 3287 | } |
| 3288 | |
| 3289 | // Check for complex exit control |
| 3290 | for (uint ii = 0; ii < loop->_body.size(); ii++) { |
| 3291 | Node *n = loop->_body.at(ii); |
| 3292 | int opc = n->Opcode(); |
| 3293 | if (n->is_Call() || |
| 3294 | opc == Op_Catch || |
| 3295 | opc == Op_CatchProj || |
| 3296 | opc == Op_Jump || |
| 3297 | opc == Op_JumpProj) { |
| 3298 | #ifndef PRODUCT |
| 3299 | if (TracePartialPeeling) { |
| 3300 | tty->print_cr("\nExit control too complex: lp: %d", head->_idx); |
| 3301 | } |
| 3302 | #endif |
| 3303 | return false; |
| 3304 | } |
| 3305 | } |
| 3306 | |
| 3307 | int dd = dom_depth(head); |
| 3308 | |
| 3309 | // Step 1: find cut point |
| 3310 | |
| 3311 | // Walk up dominators to loop head looking for first loop exit |
| 3312 | // which is executed on every path thru loop. |
| 3313 | IfNode *peel_if = NULL__null; |
| 3314 | IfNode *peel_if_cmpu = NULL__null; |
| 3315 | |
| 3316 | Node *iff = loop->tail(); |
| 3317 | while (iff != head) { |
| 3318 | if (iff->is_If()) { |
| 3319 | Node *ctrl = get_ctrl(iff->in(1)); |
| 3320 | if (ctrl->is_top()) return false; // Dead test on live IF. |
| 3321 | // If loop-varying exit-test, check for induction variable |
| 3322 | if (loop->is_member(get_loop(ctrl)) && |
| 3323 | loop->is_loop_exit(iff) && |
| 3324 | is_possible_iv_test(iff)) { |
| 3325 | Node* cmp = iff->in(1)->in(1); |
| 3326 | if (cmp->Opcode() == Op_CmpI) { |
| 3327 | peel_if = iff->as_If(); |
| 3328 | } else { |
| 3329 | assert(cmp->Opcode() == Op_CmpU, "must be CmpI or CmpU")do { if (!(cmp->Opcode() == Op_CmpU)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3329, "assert(" "cmp->Opcode() == Op_CmpU" ") failed", "must be CmpI or CmpU" ); ::breakpoint(); } } while (0); |
| 3330 | peel_if_cmpu = iff->as_If(); |
| 3331 | } |
| 3332 | } |
| 3333 | } |
| 3334 | iff = idom(iff); |
| 3335 | } |
| 3336 | |
| 3337 | // Prefer signed compare over unsigned compare. |
| 3338 | IfNode* new_peel_if = NULL__null; |
| 3339 | if (peel_if == NULL__null) { |
| 3340 | if (!PartialPeelAtUnsignedTests || peel_if_cmpu == NULL__null) { |
| 3341 | return false; // No peel point found |
| 3342 | } |
| 3343 | new_peel_if = insert_cmpi_loop_exit(peel_if_cmpu, loop); |
| 3344 | if (new_peel_if == NULL__null) { |
| 3345 | return false; // No peel point found |
| 3346 | } |
| 3347 | peel_if = new_peel_if; |
| 3348 | } |
| 3349 | Node* last_peel = stay_in_loop(peel_if, loop); |
| 3350 | Node* first_not_peeled = stay_in_loop(last_peel, loop); |
| 3351 | if (first_not_peeled == NULL__null || first_not_peeled == head) { |
| 3352 | return false; |
| 3353 | } |
| 3354 | |
| 3355 | #ifndef PRODUCT |
| 3356 | if (TraceLoopOpts) { |
| 3357 | tty->print("PartialPeel "); |
| 3358 | loop->dump_head(); |
| 3359 | } |
| 3360 | |
| 3361 | if (TracePartialPeeling) { |
| 3362 | tty->print_cr("before partial peel one iteration"); |
| 3363 | Node_List wl; |
| 3364 | Node* t = head->in(2); |
| 3365 | while (true) { |
| 3366 | wl.push(t); |
| 3367 | if (t == head) break; |
| 3368 | t = idom(t); |
| 3369 | } |
| 3370 | while (wl.size() > 0) { |
| 3371 | Node* tt = wl.pop(); |
| 3372 | tt->dump(); |
| 3373 | if (tt == last_peel) tty->print_cr("-- cut --"); |
| 3374 | } |
| 3375 | } |
| 3376 | #endif |
| 3377 | VectorSet peel; |
| 3378 | VectorSet not_peel; |
| 3379 | Node_List peel_list; |
| 3380 | Node_List worklist; |
| 3381 | Node_List sink_list; |
| 3382 | |
| 3383 | uint estimate = loop->est_loop_clone_sz(1); |
| 3384 | if (exceeding_node_budget(estimate)) { |
| 3385 | return false; |
| 3386 | } |
| 3387 | |
| 3388 | // Set of cfg nodes to peel are those that are executable from |
| 3389 | // the head through last_peel. |
| 3390 | assert(worklist.size() == 0, "should be empty")do { if (!(worklist.size() == 0)) { (*g_assert_poison) = 'X'; ; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3390, "assert(" "worklist.size() == 0" ") failed", "should be empty" ); ::breakpoint(); } } while (0); |
| 3391 | worklist.push(head); |
| 3392 | peel.set(head->_idx); |
| 3393 | while (worklist.size() > 0) { |
| 3394 | Node *n = worklist.pop(); |
| 3395 | if (n != last_peel) { |
| 3396 | for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) { |
| 3397 | Node* use = n->fast_out(j); |
| 3398 | if (use->is_CFG() && |
| 3399 | loop->is_member(get_loop(use)) && |
| 3400 | !peel.test_set(use->_idx)) { |
| 3401 | worklist.push(use); |
| 3402 | } |
| 3403 | } |
| 3404 | } |
| 3405 | } |
| 3406 | |
| 3407 | // Set of non-cfg nodes to peel are those that are control |
| 3408 | // dependent on the cfg nodes. |
| 3409 | for (uint i = 0; i < loop->_body.size(); i++) { |
| 3410 | Node *n = loop->_body.at(i); |
| 3411 | Node *n_c = has_ctrl(n) ? get_ctrl(n) : n; |
| 3412 | if (peel.test(n_c->_idx)) { |
| 3413 | peel.set(n->_idx); |
| 3414 | } else { |
| 3415 | not_peel.set(n->_idx); |
| 3416 | } |
| 3417 | } |
| 3418 | |
| 3419 | // Step 2: move operations from the peeled section down into the |
| 3420 | // not-peeled section |
| 3421 | |
| 3422 | // Get a post order schedule of nodes in the peel region |
| 3423 | // Result in right-most operand. |
| 3424 | scheduled_nodelist(loop, peel, peel_list); |
| 3425 | |
| 3426 | assert(is_valid_loop_partition(loop, peel, peel_list, not_peel), "bad partition")do { if (!(is_valid_loop_partition(loop, peel, peel_list, not_peel ))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3426, "assert(" "is_valid_loop_partition(loop, peel, peel_list, not_peel)" ") failed", "bad partition"); ::breakpoint(); } } while (0); |
| 3427 | |
| 3428 | // For future check for too many new phis |
| 3429 | uint old_phi_cnt = 0; |
| 3430 | for (DUIterator_Fast jmax, j = head->fast_outs(jmax); j < jmax; j++) { |
| 3431 | Node* use = head->fast_out(j); |
| 3432 | if (use->is_Phi()) old_phi_cnt++; |
| 3433 | } |
| 3434 | |
| 3435 | #ifndef PRODUCT |
| 3436 | if (TracePartialPeeling) { |
| 3437 | tty->print_cr("\npeeled list"); |
| 3438 | } |
| 3439 | #endif |
| 3440 | |
| 3441 | // Evacuate nodes in peel region into the not_peeled region if possible |
| 3442 | bool too_many_clones = false; |
| 3443 | uint new_phi_cnt = 0; |
| 3444 | uint cloned_for_outside_use = 0; |
| 3445 | for (uint i = 0; i < peel_list.size();) { |
| 3446 | Node* n = peel_list.at(i); |
| 3447 | #ifndef PRODUCT |
| 3448 | if (TracePartialPeeling) n->dump(); |
| 3449 | #endif |
| 3450 | bool incr = true; |
| 3451 | if (!n->is_CFG()) { |
| 3452 | if (has_use_in_set(n, not_peel)) { |
| 3453 | // If not used internal to the peeled region, |
| 3454 | // move "n" from peeled to not_peeled region. |
| 3455 | if (!has_use_internal_to_set(n, peel, loop)) { |
| 3456 | // if not pinned and not a load (which maybe anti-dependent on a store) |
| 3457 | // and not a CMove (Matcher expects only bool->cmove). |
| 3458 | if (n->in(0) == NULL__null && !n->is_Load() && !n->is_CMove()) { |
| 3459 | int new_clones = clone_for_use_outside_loop(loop, n, worklist); |
| 3460 | if (new_clones == -1) { |
| 3461 | too_many_clones = true; |
| 3462 | break; |
| 3463 | } |
| 3464 | cloned_for_outside_use += new_clones; |
| 3465 | sink_list.push(n); |
| 3466 | peel.remove(n->_idx); |
| 3467 | not_peel.set(n->_idx); |
| 3468 | peel_list.remove(i); |
| 3469 | incr = false; |
| 3470 | #ifndef PRODUCT |
| 3471 | if (TracePartialPeeling) { |
| 3472 | tty->print_cr("sink to not_peeled region: %d newbb: %d", |
| 3473 | n->_idx, get_ctrl(n)->_idx); |
| 3474 | } |
| 3475 | #endif |
| 3476 | } |
| 3477 | } else { |
| 3478 | // Otherwise check for special def-use cases that span |
| 3479 | // the peel/not_peel boundary such as bool->if |
| 3480 | clone_for_special_use_inside_loop(loop, n, not_peel, sink_list, worklist); |
| 3481 | new_phi_cnt++; |
| 3482 | } |
| 3483 | } |
| 3484 | } |
| 3485 | if (incr) i++; |
| 3486 | } |
| 3487 | |
| 3488 | estimate += cloned_for_outside_use + new_phi_cnt; |
| 3489 | bool exceed_node_budget = !may_require_nodes(estimate); |
| 3490 | bool exceed_phi_limit = new_phi_cnt > old_phi_cnt + PartialPeelNewPhiDelta; |
| 3491 | |
| 3492 | if (too_many_clones || exceed_node_budget || exceed_phi_limit) { |
| 3493 | #ifndef PRODUCT |
| 3494 | if (TracePartialPeeling && exceed_phi_limit) { |
| 3495 | tty->print_cr("\nToo many new phis: %d old %d new cmpi: %c", |
| 3496 | new_phi_cnt, old_phi_cnt, new_peel_if != NULL__null?'T':'F'); |
| 3497 | } |
| 3498 | #endif |
| 3499 | if (new_peel_if != NULL__null) { |
| 3500 | remove_cmpi_loop_exit(new_peel_if, loop); |
| 3501 | } |
| 3502 | // Inhibit more partial peeling on this loop |
| 3503 | assert(!head->is_partial_peel_loop(), "not partial peeled")do { if (!(!head->is_partial_peel_loop())) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3503, "assert(" "!head->is_partial_peel_loop()" ") failed" , "not partial peeled"); ::breakpoint(); } } while (0); |
| 3504 | head->mark_partial_peel_failed(); |
| 3505 | if (cloned_for_outside_use > 0) { |
| 3506 | // Terminate this round of loop opts because |
| 3507 | // the graph outside this loop was changed. |
| 3508 | C->set_major_progress(); |
| 3509 | return true; |
| 3510 | } |
| 3511 | return false; |
| 3512 | } |
| 3513 | |
| 3514 | // Step 3: clone loop, retarget control, and insert new phis |
| 3515 | |
| 3516 | // Create new loop head for new phis and to hang |
| 3517 | // the nodes being moved (sinked) from the peel region. |
| 3518 | LoopNode* new_head = new LoopNode(last_peel, last_peel); |
| 3519 | new_head->set_unswitch_count(head->unswitch_count()); // Preserve |
| 3520 | _igvn.register_new_node_with_optimizer(new_head); |
| 3521 | assert(first_not_peeled->in(0) == last_peel, "last_peel <- first_not_peeled")do { if (!(first_not_peeled->in(0) == last_peel)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3521, "assert(" "first_not_peeled->in(0) == last_peel" ") failed" , "last_peel <- first_not_peeled"); ::breakpoint(); } } while (0); |
| 3522 | _igvn.replace_input_of(first_not_peeled, 0, new_head); |
| 3523 | set_loop(new_head, loop); |
| 3524 | loop->_body.push(new_head); |
| 3525 | not_peel.set(new_head->_idx); |
| 3526 | set_idom(new_head, last_peel, dom_depth(first_not_peeled)); |
| 3527 | set_idom(first_not_peeled, new_head, dom_depth(first_not_peeled)); |
| 3528 | |
| 3529 | while (sink_list.size() > 0) { |
| 3530 | Node* n = sink_list.pop(); |
| 3531 | set_ctrl(n, new_head); |
| 3532 | } |
| 3533 | |
| 3534 | assert(is_valid_loop_partition(loop, peel, peel_list, not_peel), "bad partition")do { if (!(is_valid_loop_partition(loop, peel, peel_list, not_peel ))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3534, "assert(" "is_valid_loop_partition(loop, peel, peel_list, not_peel)" ") failed", "bad partition"); ::breakpoint(); } } while (0); |
| 3535 | |
| 3536 | clone_loop(loop, old_new, dd, IgnoreStripMined); |
| 3537 | |
| 3538 | const uint clone_exit_idx = 1; |
| 3539 | const uint orig_exit_idx = 2; |
| 3540 | assert(is_valid_clone_loop_form(loop, peel_list, orig_exit_idx, clone_exit_idx), "bad clone loop")do { if (!(is_valid_clone_loop_form(loop, peel_list, orig_exit_idx , clone_exit_idx))) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3540, "assert(" "is_valid_clone_loop_form(loop, peel_list, orig_exit_idx, clone_exit_idx)" ") failed", "bad clone loop"); ::breakpoint(); } } while (0); |
| 3541 | |
| 3542 | Node* head_clone = old_new[head->_idx]; |
| 3543 | LoopNode* new_head_clone = old_new[new_head->_idx]->as_Loop(); |
| 3544 | Node* orig_tail_clone = head_clone->in(2); |
| 3545 | |
| 3546 | // Add phi if "def" node is in peel set and "use" is not |
| 3547 | |
| 3548 | for (uint i = 0; i < peel_list.size(); i++) { |
| 3549 | Node *def = peel_list.at(i); |
| 3550 | if (!def->is_CFG()) { |
| 3551 | for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { |
| 3552 | Node *use = def->fast_out(j); |
| 3553 | if (has_node(use) && use->in(0) != C->top() && |
| 3554 | (!peel.test(use->_idx) || |
| 3555 | (use->is_Phi() && use->in(0) == head)) ) { |
| 3556 | worklist.push(use); |
| 3557 | } |
| 3558 | } |
| 3559 | while( worklist.size() ) { |
| 3560 | Node *use = worklist.pop(); |
| 3561 | for (uint j = 1; j < use->req(); j++) { |
| 3562 | Node* n = use->in(j); |
| 3563 | if (n == def) { |
| 3564 | |
| 3565 | // "def" is in peel set, "use" is not in peel set |
| 3566 | // or "use" is in the entry boundary (a phi) of the peel set |
| 3567 | |
| 3568 | Node* use_c = has_ctrl(use) ? get_ctrl(use) : use; |
| 3569 | |
| 3570 | if ( loop->is_member(get_loop( use_c )) ) { |
| 3571 | // use is in loop |
| 3572 | if (old_new[use->_idx] != NULL__null) { // null for dead code |
| 3573 | Node* use_clone = old_new[use->_idx]; |
| 3574 | _igvn.replace_input_of(use, j, C->top()); |
| 3575 | insert_phi_for_loop( use_clone, j, old_new[def->_idx], def, new_head_clone ); |
| 3576 | } |
| 3577 | } else { |
| 3578 | assert(is_valid_clone_loop_exit_use(loop, use, orig_exit_idx), "clone loop format")do { if (!(is_valid_clone_loop_exit_use(loop, use, orig_exit_idx ))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3578, "assert(" "is_valid_clone_loop_exit_use(loop, use, orig_exit_idx)" ") failed", "clone loop format"); ::breakpoint(); } } while ( 0); |
| 3579 | // use is not in the loop, check if the live range includes the cut |
| 3580 | Node* lp_if = use_c->in(orig_exit_idx)->in(0); |
| 3581 | if (not_peel.test(lp_if->_idx)) { |
| 3582 | assert(j == orig_exit_idx, "use from original loop")do { if (!(j == orig_exit_idx)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/opto/loopopts.cpp" , 3582, "assert(" "j == orig_exit_idx" ") failed", "use from original loop" ); ::breakpoint(); } } while (0); |
| 3583 | insert_phi_for_loop( use, clone_exit_idx, old_new[def->_idx], def, new_head_clone ); |
| 3584 | } |
| 3585 | } |
| 3586 | } |
| 3587 | } |
| 3588 | } |
| 3589 | } |
| 3590 | } |
| 3591 | |
| 3592 | // Step 3b: retarget control |
| 3593 | |
| 3594 | // Redirect control to the new loop head if a cloned node in |
| 3595 | // the not_peeled region has control that points into the peeled region. |
| 3596 | // This necessary because the cloned peeled region will be outside |
| 3597 | // the loop. |
| 3598 | // from to |
| 3599 | // cloned-peeled <---+ |
| 3600 | // new_head_clone: | <--+ |
| 3601 | // cloned-not_peeled in(0) in(0) |
| 3602 | // orig-peeled |
| 3603 | |
| 3604 | for (uint i = 0; i < loop->_body.size(); i++) { |
| 3605 | Node *n = loop->_body.at(i); |
| 3606 | if (!n->is_CFG() && n->in(0) != NULL__null && |
| 3607 | not_peel.test(n->_idx) && peel.test(n->in(0)->_idx)) { |
| 3608 | Node* n_clone = old_new[n->_idx]; |
| 3609 | _igvn.replace_input_of(n_clone, 0, new_head_clone); |
| 3610 | } |
| 3611 | } |
| 3612 | |
| 3613 | // Backedge of the surviving new_head (the clone) is original last_peel |
| 3614 | _igvn.replace_input_of(new_head_clone, LoopNode::LoopBackControl, last_peel); |
| 3615 | |
| 3616 | // Cut first node in original not_peel set |
| 3617 | _igvn.rehash_node_delayed(new_head); // Multiple edge updates: |
| 3618 | new_head->set_req(LoopNode::EntryControl, C->top()); // use rehash_node_delayed / set_req instead of |
| 3619 | new_head->set_req(LoopNode::LoopBackControl, C->top()); // multiple replace_input_of calls |
| 3620 | |
| 3621 | // Copy head_clone back-branch info to original head |
| 3622 | // and remove original head's loop entry and |
| 3623 | // clone head's back-branch |
| 3624 | _igvn.rehash_node_delayed(head); // Multiple edge updates |
| 3625 | head->set_req(LoopNode::EntryControl, head_clone->in(LoopNode::LoopBackControl)); |
| 3626 | head->set_req(LoopNode::LoopBackControl, C->top()); |
| 3627 | _igvn.replace_input_of(head_clone, LoopNode::LoopBackControl, C->top()); |
| 3628 | |
| 3629 | // Similarly modify the phis |
| 3630 | for (DUIterator_Fast kmax, k = head->fast_outs(kmax); k < kmax; k++) { |
| 3631 | Node* use = head->fast_out(k); |
| 3632 | if (use->is_Phi() && use->outcnt() > 0) { |
| 3633 | Node* use_clone = old_new[use->_idx]; |
| 3634 | _igvn.rehash_node_delayed(use); // Multiple edge updates |
| 3635 | use->set_req(LoopNode::EntryControl, use_clone->in(LoopNode::LoopBackControl)); |
| 3636 | use->set_req(LoopNode::LoopBackControl, C->top()); |
| 3637 | _igvn.replace_input_of(use_clone, LoopNode::LoopBackControl, C->top()); |
| 3638 | } |
| 3639 | } |
| 3640 | |
| 3641 | // Step 4: update dominator tree and dominator depth |
| 3642 | |
| 3643 | set_idom(head, orig_tail_clone, dd); |
| 3644 | recompute_dom_depth(); |
| 3645 | |
| 3646 | // Inhibit more partial peeling on this loop |
| 3647 | new_head_clone->set_partial_peel_loop(); |
| 3648 | C->set_major_progress(); |
| 3649 | loop->record_for_igvn(); |
| 3650 | |
| 3651 | #ifndef PRODUCT |
| 3652 | if (TracePartialPeeling) { |
| 3653 | tty->print_cr("\nafter partial peel one iteration"); |
| 3654 | Node_List wl; |
| 3655 | Node* t = last_peel; |
| 3656 | while (true) { |
| 3657 | wl.push(t); |
| 3658 | if (t == head_clone) break; |
| 3659 | t = idom(t); |
| 3660 | } |
| 3661 | while (wl.size() > 0) { |
| 3662 | Node* tt = wl.pop(); |
| 3663 | if (tt == head) tty->print_cr("orig head"); |
| 3664 | else if (tt == new_head_clone) tty->print_cr("new head"); |
| 3665 | else if (tt == head_clone) tty->print_cr("clone head"); |
| 3666 | tt->dump(); |
| 3667 | } |
| 3668 | } |
| 3669 | #endif |
| 3670 | return true; |
| 3671 | } |
| 3672 | |
| 3673 | //------------------------------reorg_offsets---------------------------------- |
| 3674 | // Reorganize offset computations to lower register pressure. Mostly |
| 3675 | // prevent loop-fallout uses of the pre-incremented trip counter (which are |
| 3676 | // then alive with the post-incremented trip counter forcing an extra |
| 3677 | // register move) |
| 3678 | void PhaseIdealLoop::reorg_offsets(IdealLoopTree *loop) { |
| 3679 | // Perform it only for canonical counted loops. |
| 3680 | // Loop's shape could be messed up by iteration_split_impl. |
| 3681 | if (!loop->_head->is_CountedLoop()) |
| 3682 | return; |
| 3683 | if (!loop->_head->as_Loop()->is_valid_counted_loop(T_INT)) |
| 3684 | return; |
| 3685 | |
| 3686 | CountedLoopNode *cl = loop->_head->as_CountedLoop(); |
| 3687 | CountedLoopEndNode *cle = cl->loopexit(); |
| 3688 | Node *exit = cle->proj_out(false); |
| 3689 | Node *phi = cl->phi(); |
| 3690 | |
| 3691 | // Check for the special case when using the pre-incremented trip-counter on |
| 3692 | // the fall-out path (forces the pre-incremented and post-incremented trip |
| 3693 | // counter to be live at the same time). Fix this by adjusting to use the |
| 3694 | // post-increment trip counter. |
| 3695 | |
| 3696 | bool progress = true; |
| 3697 | while (progress) { |
| 3698 | progress = false; |
| 3699 | for (DUIterator_Fast imax, i = phi->fast_outs(imax); i < imax; i++) { |
| 3700 | Node* use = phi->fast_out(i); // User of trip-counter |
| 3701 | if (!has_ctrl(use)) continue; |
| 3702 | Node *u_ctrl = get_ctrl(use); |
| 3703 | if (use->is_Phi()) { |
| 3704 | u_ctrl = NULL__null; |
| 3705 | for (uint j = 1; j < use->req(); j++) |
| 3706 | if (use->in(j) == phi) |
| 3707 | u_ctrl = dom_lca(u_ctrl, use->in(0)->in(j)); |
| 3708 | } |
| 3709 | IdealLoopTree *u_loop = get_loop(u_ctrl); |
| 3710 | // Look for loop-invariant use |
| 3711 | if (u_loop == loop) continue; |
| 3712 | if (loop->is_member(u_loop)) continue; |
| 3713 | // Check that use is live out the bottom. Assuming the trip-counter |
| 3714 | // update is right at the bottom, uses of of the loop middle are ok. |
| 3715 | if (dom_lca(exit, u_ctrl) != exit) continue; |
| 3716 | // Hit! Refactor use to use the post-incremented tripcounter. |
| 3717 | // Compute a post-increment tripcounter. |
| 3718 | Node* c = exit; |
| 3719 | if (cl->is_strip_mined()) { |
| 3720 | IdealLoopTree* outer_loop = get_loop(cl->outer_loop()); |
| 3721 | if (!outer_loop->is_member(u_loop)) { |
| 3722 | c = cl->outer_loop_exit(); |
| 3723 | } |
| 3724 | } |
| 3725 | Node *opaq = new Opaque2Node(C, cle->incr()); |
| 3726 | register_new_node(opaq, c); |
| 3727 | Node *neg_stride = _igvn.intcon(-cle->stride_con()); |
| 3728 | set_ctrl(neg_stride, C->root()); |
| 3729 | Node *post = new AddINode(opaq, neg_stride); |
| 3730 | register_new_node(post, c); |
| 3731 | _igvn.rehash_node_delayed(use); |
| 3732 | for (uint j = 1; j < use->req(); j++) { |
| 3733 | if (use->in(j) == phi) |
| 3734 | use->set_req(j, post); |
| 3735 | } |
| 3736 | // Since DU info changed, rerun loop |
| 3737 | progress = true; |
| 3738 | break; |
| 3739 | } |
| 3740 | } |
| 3741 | |
| 3742 | } |