mirror of
https://github.com/dart-lang/sdk
synced 2024-09-15 23:19:47 +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>
66 lines
1.8 KiB
C++
66 lines
1.8 KiB
C++
// Copyright (c) 2011, 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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#include "vm/globals.h"
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#if defined(TARGET_ARCH_IA32)
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#include "vm/cpu.h"
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#include "vm/cpu_ia32.h"
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#include "vm/compiler/assembler/assembler.h"
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#include "vm/constants.h"
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#include "vm/cpuinfo.h"
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#include "vm/heap/heap.h"
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#include "vm/isolate.h"
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#include "vm/object.h"
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namespace dart {
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DEFINE_FLAG(bool, use_sse41, true, "Use SSE 4.1 if available");
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void CPU::FlushICache(uword start, uword size) {
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// Nothing to be done here.
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}
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const char* CPU::Id() {
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return "ia32";
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}
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const char* HostCPUFeatures::hardware_ = nullptr;
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bool HostCPUFeatures::sse2_supported_ = false;
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bool HostCPUFeatures::sse4_1_supported_ = false;
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bool HostCPUFeatures::popcnt_supported_ = false;
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bool HostCPUFeatures::abm_supported_ = false;
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#if defined(DEBUG)
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bool HostCPUFeatures::initialized_ = false;
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#endif
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void HostCPUFeatures::Init() {
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CpuInfo::Init();
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hardware_ = CpuInfo::GetCpuModel();
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sse2_supported_ = CpuInfo::FieldContains(kCpuInfoFeatures, "sse2");
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sse4_1_supported_ = CpuInfo::FieldContains(kCpuInfoFeatures, "sse4_1") ||
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CpuInfo::FieldContains(kCpuInfoFeatures, "sse4.1");
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popcnt_supported_ = CpuInfo::FieldContains(kCpuInfoFeatures, "popcnt");
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abm_supported_ = CpuInfo::FieldContains(kCpuInfoFeatures, "abm");
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#if defined(DEBUG)
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initialized_ = true;
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#endif
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}
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void HostCPUFeatures::Cleanup() {
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DEBUG_ASSERT(initialized_);
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#if defined(DEBUG)
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initialized_ = false;
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#endif
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ASSERT(hardware_ != NULL);
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free(const_cast<char*>(hardware_));
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hardware_ = NULL;
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CpuInfo::Cleanup();
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_IA32
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