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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// CPU specific code for ia32 independent of OS goes here.
#ifdef __GNUC__
#include "third_party/valgrind/valgrind.h"
#endif
#include "v8.h"
#if V8_TARGET_ARCH_IA32
#include "cpu.h"
#include "macro-assembler.h"
namespace v8 {
namespace internal {
void CPU::SetUp() {
CpuFeatures::Probe();
}
bool CPU::SupportsCrankshaft() {
return CpuFeatures::IsSupported(SSE2);
}
void CPU::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 v8::internal
#endif // V8_TARGET_ARCH_IA32
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