| File: | jdk/src/hotspot/cpu/x86/c2_init_x86.cpp |
| Warning: | line 48, column 9 Value stored to 'top' during its initialization is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | /* |
| 2 | * Copyright (c) 2000, 2021, 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 "opto/compile.hpp" |
| 27 | #include "opto/node.hpp" |
| 28 | #include "opto/optoreg.hpp" |
| 29 | #include "runtime/vm_version.hpp" |
| 30 | |
| 31 | // processor dependent initialization for i486 |
| 32 | |
| 33 | extern void reg_mask_init(); |
| 34 | |
| 35 | void Compile::pd_compiler2_init() { |
| 36 | guarantee(CodeEntryAlignment >= InteriorEntryAlignment, "" )do { if (!(CodeEntryAlignment >= InteriorEntryAlignment)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/cpu/x86/c2_init_x86.cpp" , 36, "guarantee(" "CodeEntryAlignment >= InteriorEntryAlignment" ") failed", ""); ::breakpoint(); } } while (0); |
| 37 | // QQQ presumably all 64bit cpu's support this. Seems like the ifdef could |
| 38 | // simply be left out. |
| 39 | #ifndef AMD641 |
| 40 | if (!VM_Version::supports_cmov()) { |
| 41 | ConditionalMoveLimit = 0; |
| 42 | } |
| 43 | #endif // AMD64 |
| 44 | |
| 45 | if (UseAVX < 3) { |
| 46 | int delta = XMMRegisterImpl::max_slots_per_register * XMMRegisterImpl::number_of_registers; |
| 47 | int bottom = ConcreteRegisterImpl::max_fpr; |
| 48 | int top = bottom + delta; |
Value stored to 'top' during its initialization is never read | |
| 49 | int middle = bottom + (delta / 2); |
| 50 | int xmm_slots = XMMRegisterImpl::max_slots_per_register; |
| 51 | int lower = xmm_slots / 2; |
| 52 | // mark bad every register that we cannot get to if AVX less than 3, we have all slots in the array |
| 53 | // Note: vm2opto is allocated to ConcreteRegisterImpl::number_of_registers |
| 54 | for (int i = bottom; i < middle; i += xmm_slots) { |
| 55 | for (OptoReg::Name j = OptoReg::Name(i + lower); j<OptoReg::Name(i + xmm_slots); j = OptoReg::add(j, 1)) { |
| 56 | OptoReg::invalidate(j); |
| 57 | } |
| 58 | } |
| 59 | // mark the upper zmm bank bad and all the mask registers bad in this case |
| 60 | for (OptoReg::Name i = OptoReg::Name(middle); i<OptoReg::Name(_last_Mach_Reg - 1); i = OptoReg::add(i, 1)) { |
| 61 | OptoReg::invalidate(i); |
| 62 | } |
| 63 | } |
| 64 | reg_mask_init(); |
| 65 | } |