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deps/v8/src/codegen/x64/cpu-x64.cc
41 строка
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Michaël Zasso
deps: update V8 to 13.6.233.8
02 май 2025, 16:06
Не верифицирован
02 май 2025, 16:06
918fe04
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// Copyright 2012 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. // CPU specific code for x64 independent of OS goes here. #if V8_TARGET_ARCH_X64 #include "src/codegen/cpu-features.h" #if defined(__GNUC__) && !defined(__MINGW64__) && !defined(GOOGLE3) #include "third_party/valgrind/valgrind.h" #endif namespace v8 { namespace internal { void CpuFeatures::FlushICache(void* start, size_t size) { // No need to flush the instruction cache on Intel. On Intel instruction // cache flushing is only necessary when multiple cores running the same // code simultaneously. V8 (and JavaScript) is single threaded and when code // is patched on an intel CPU the core performing the patching will have its // own instruction cache updated automatically. // If flushing of the instruction cache becomes necessary Windows has the // API function FlushInstructionCache. // By default, valgrind only checks the stack for writes that might need to // invalidate already cached translated code. This leads to random // instability when code patches or moves are sometimes unnoticed. One // solution is to run valgrind with --smc-check=all, but this comes at a big // performance cost. We can notify valgrind to invalidate its cache. #ifdef VALGRIND_DISCARD_TRANSLATIONS unsigned res = VALGRIND_DISCARD_TRANSLATIONS(start, size); USE(res); #endif } } // namespace internal } // namespace v8 #endif // V8_TARGET_ARCH_X64