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https://github.com/dart-lang/sdk
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15e5ec1762
This change enables use of roundsd instruction on x64 if SSE4.1 is detected (in JIT mode). Also, XMM register is cleared before roundsd to avoid false dependency due to partial register access in roundsd. Microbenchmark results on JIT/x64: Before: BenchFloor(RunTime): 303.81512987999395 us. After: BenchFloor(RunTime): 135.00067499156262 us. Custom floor implementation in Dart: BenchFastFloor(RunTime): 147.609889298893 us. TEST=ci Issue: https://github.com/dart-lang/sdk/issues/46650 Change-Id: I13502f5d40edf32916edec14cfab027758a22457 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/209764 Reviewed-by: Slava Egorov <vegorov@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
72 lines
2 KiB
C++
72 lines
2 KiB
C++
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_CPU_X64_H_
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#define RUNTIME_VM_CPU_X64_H_
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#if !defined(RUNTIME_VM_CPU_H_)
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#error Do not include cpu_x64.h directly; use cpu.h instead.
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#endif
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#include "vm/allocation.h"
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#include "vm/flags.h"
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namespace dart {
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DECLARE_FLAG(bool, use_sse41);
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class HostCPUFeatures : public AllStatic {
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public:
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static void Init();
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static void Cleanup();
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static const char* hardware() {
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DEBUG_ASSERT(initialized_);
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return hardware_;
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}
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static bool sse2_supported() {
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DEBUG_ASSERT(initialized_);
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return sse2_supported_;
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}
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static bool sse4_1_supported() {
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DEBUG_ASSERT(initialized_);
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return sse4_1_supported_ && FLAG_use_sse41;
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}
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static bool popcnt_supported() {
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DEBUG_ASSERT(initialized_);
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return popcnt_supported_;
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}
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static bool abm_supported() {
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DEBUG_ASSERT(initialized_);
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return abm_supported_;
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}
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private:
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static const char* hardware_;
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static bool sse2_supported_;
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static bool sse4_1_supported_;
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static bool popcnt_supported_;
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static bool abm_supported_;
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#if defined(DEBUG)
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static bool initialized_;
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#endif
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};
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class TargetCPUFeatures : public AllStatic {
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public:
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static void Init() { HostCPUFeatures::Init(); }
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static void Cleanup() { HostCPUFeatures::Cleanup(); }
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static const char* hardware() { return HostCPUFeatures::hardware(); }
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static bool sse2_supported() { return HostCPUFeatures::sse2_supported(); }
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static bool sse4_1_supported() { return HostCPUFeatures::sse4_1_supported(); }
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static bool popcnt_supported() { return HostCPUFeatures::popcnt_supported(); }
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static bool abm_supported() { return HostCPUFeatures::abm_supported(); }
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static bool double_truncate_round_supported() {
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return HostCPUFeatures::sse4_1_supported();
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}
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};
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} // namespace dart
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#endif // RUNTIME_VM_CPU_X64_H_
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