mirror of
https://github.com/dart-lang/sdk
synced 2024-09-19 21:01:50 +00:00
0ad30fafc1
Rationale: We are adding library support for bit operations: lowZeroBitCount/highZeroBitCount/nonZeroBitCount The added features will enable very efficient direct native implementations of these operations in the DartVM codegen. https://github.com/dart-lang/sdk/issues/38346 Change-Id: Id734a7590666c6abdc2a683a240094c6bf6cd46a Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/117768 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Aart Bik <ajcbik@google.com>
70 lines
1.9 KiB
C++
70 lines
1.9 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() { return false; }
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};
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} // namespace dart
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#endif // RUNTIME_VM_CPU_X64_H_
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