388 lines
12 KiB
C++
388 lines
12 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "instruction_set_features_x86.h"
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#include <fstream>
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#include <sstream>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include "arch/x86_64/instruction_set_features_x86_64.h"
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#include "base/array_ref.h"
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#include <cpu_features_macros.h>
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#ifdef CPU_FEATURES_ARCH_X86
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// This header can only be included on x86 targets,
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// as determined by cpu_features own define.
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#include <cpuinfo_x86.h>
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#endif
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namespace art {
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using android::base::StringPrintf;
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// Feature-support arrays.
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static constexpr const char* x86_known_variants[] = {
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"atom",
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"sandybridge",
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"silvermont",
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"kabylake",
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"default",
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};
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static constexpr const char* x86_variants_with_ssse3[] = {
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"atom",
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"sandybridge",
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"silvermont",
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"kabylake",
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};
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static constexpr const char* x86_variants_with_sse4_1[] = {
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"sandybridge",
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"silvermont",
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"kabylake",
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};
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static constexpr const char* x86_variants_with_sse4_2[] = {
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"sandybridge",
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"silvermont",
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"kabylake",
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};
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static constexpr const char* x86_variants_with_popcnt[] = {
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"sandybridge",
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"silvermont",
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"kabylake",
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};
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static constexpr const char* x86_variants_with_avx[] = {
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"kabylake",
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};
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static constexpr const char* x86_variants_with_avx2[] = {
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"kabylake",
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};
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X86FeaturesUniquePtr X86InstructionSetFeatures::Create(bool x86_64,
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bool has_SSSE3,
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bool has_SSE4_1,
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bool has_SSE4_2,
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bool has_AVX,
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bool has_AVX2,
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bool has_POPCNT) {
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if (x86_64) {
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return X86FeaturesUniquePtr(new X86_64InstructionSetFeatures(has_SSSE3,
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has_SSE4_1,
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has_SSE4_2,
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has_AVX,
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has_AVX2,
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has_POPCNT));
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} else {
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return X86FeaturesUniquePtr(new X86InstructionSetFeatures(has_SSSE3,
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has_SSE4_1,
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has_SSE4_2,
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has_AVX,
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has_AVX2,
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has_POPCNT));
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}
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}
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X86FeaturesUniquePtr X86InstructionSetFeatures::FromVariant(
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const std::string& variant, std::string* error_msg ATTRIBUTE_UNUSED,
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bool x86_64) {
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const bool is_runtime_isa =
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kRuntimeISA == (x86_64 ? InstructionSet::kX86_64 : InstructionSet::kX86);
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if (is_runtime_isa && variant == "default") {
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return FromCppDefines(x86_64);
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}
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bool has_SSSE3 = FindVariantInArray(x86_variants_with_ssse3, arraysize(x86_variants_with_ssse3),
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variant);
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bool has_SSE4_1 = FindVariantInArray(x86_variants_with_sse4_1,
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arraysize(x86_variants_with_sse4_1),
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variant);
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bool has_SSE4_2 = FindVariantInArray(x86_variants_with_sse4_2,
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arraysize(x86_variants_with_sse4_2),
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variant);
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bool has_AVX = FindVariantInArray(x86_variants_with_avx,
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arraysize(x86_variants_with_avx),
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variant);
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bool has_AVX2 = FindVariantInArray(x86_variants_with_avx2,
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arraysize(x86_variants_with_avx2),
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variant);
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bool has_POPCNT = FindVariantInArray(x86_variants_with_popcnt,
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arraysize(x86_variants_with_popcnt),
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variant);
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// Verify that variant is known.
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bool known_variant = FindVariantInArray(x86_known_variants, arraysize(x86_known_variants),
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variant);
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if (!known_variant) {
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std::ostringstream os;
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os << "Unexpected CPU variant for x86: " << variant << ".\n"
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<< "Known variants: "
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<< android::base::Join(ArrayRef<const char* const>(x86_known_variants), ", ");
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LOG(WARNING) << os.str();
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}
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return Create(x86_64, has_SSSE3, has_SSE4_1, has_SSE4_2, has_AVX, has_AVX2, has_POPCNT);
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}
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X86FeaturesUniquePtr X86InstructionSetFeatures::FromBitmap(uint32_t bitmap, bool x86_64) {
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bool has_SSSE3 = (bitmap & kSsse3Bitfield) != 0;
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bool has_SSE4_1 = (bitmap & kSse4_1Bitfield) != 0;
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bool has_SSE4_2 = (bitmap & kSse4_2Bitfield) != 0;
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bool has_AVX = (bitmap & kAvxBitfield) != 0;
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bool has_AVX2 = (bitmap & kAvxBitfield) != 0;
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bool has_POPCNT = (bitmap & kPopCntBitfield) != 0;
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return Create(x86_64, has_SSSE3, has_SSE4_1, has_SSE4_2, has_AVX, has_AVX2, has_POPCNT);
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}
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X86FeaturesUniquePtr X86InstructionSetFeatures::FromCppDefines(bool x86_64) {
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#ifndef __SSSE3__
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const bool has_SSSE3 = false;
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#else
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const bool has_SSSE3 = true;
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#endif
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#ifndef __SSE4_1__
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const bool has_SSE4_1 = false;
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#else
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const bool has_SSE4_1 = true;
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#endif
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#ifndef __SSE4_2__
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const bool has_SSE4_2 = false;
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#else
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const bool has_SSE4_2 = true;
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#endif
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#ifndef __AVX__
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const bool has_AVX = false;
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#else
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const bool has_AVX = true;
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#endif
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#ifndef __AVX2__
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const bool has_AVX2 = false;
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#else
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const bool has_AVX2 = true;
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#endif
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#ifndef __POPCNT__
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const bool has_POPCNT = false;
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#else
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const bool has_POPCNT = true;
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#endif
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return Create(x86_64, has_SSSE3, has_SSE4_1, has_SSE4_2, has_AVX, has_AVX2, has_POPCNT);
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}
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X86FeaturesUniquePtr X86InstructionSetFeatures::FromCpuInfo(bool x86_64) {
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// Look in /proc/cpuinfo for features we need. Only use this when we can guarantee that
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// the kernel puts the appropriate feature flags in here. Sometimes it doesn't.
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bool has_SSSE3 = false;
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bool has_SSE4_1 = false;
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bool has_SSE4_2 = false;
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bool has_AVX = false;
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bool has_AVX2 = false;
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bool has_POPCNT = false;
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std::ifstream in("/proc/cpuinfo");
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if (!in.fail()) {
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while (!in.eof()) {
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std::string line;
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std::getline(in, line);
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if (!in.eof()) {
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LOG(INFO) << "cpuinfo line: " << line;
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if (line.find("flags") != std::string::npos) {
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LOG(INFO) << "found flags";
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if (line.find("ssse3") != std::string::npos) {
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has_SSSE3 = true;
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}
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if (line.find("sse4_1") != std::string::npos) {
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has_SSE4_1 = true;
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}
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if (line.find("sse4_2") != std::string::npos) {
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has_SSE4_2 = true;
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}
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if (line.find("avx") != std::string::npos) {
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has_AVX = true;
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}
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if (line.find("avx2") != std::string::npos) {
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has_AVX2 = true;
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}
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if (line.find("popcnt") != std::string::npos) {
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has_POPCNT = true;
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}
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}
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}
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}
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in.close();
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} else {
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LOG(ERROR) << "Failed to open /proc/cpuinfo";
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}
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return Create(x86_64, has_SSSE3, has_SSE4_1, has_SSE4_2, has_AVX, has_AVX2, has_POPCNT);
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}
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X86FeaturesUniquePtr X86InstructionSetFeatures::FromHwcap(bool x86_64) {
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UNIMPLEMENTED(WARNING);
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return FromCppDefines(x86_64);
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}
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X86FeaturesUniquePtr X86InstructionSetFeatures::FromAssembly(bool x86_64) {
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UNIMPLEMENTED(WARNING);
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return FromCppDefines(x86_64);
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}
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X86FeaturesUniquePtr X86InstructionSetFeatures::FromCpuFeatures(bool x86_64) {
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#ifdef CPU_FEATURES_ARCH_X86
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cpu_features::X86Features features = cpu_features::GetX86Info().features;
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return Create(x86_64,
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features.ssse3,
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features.sse4_1,
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features.sse4_2,
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features.avx,
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features.avx2,
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features.popcnt);
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#else
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UNIMPLEMENTED(WARNING);
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return FromCppDefines(x86_64);
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#endif
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}
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bool X86InstructionSetFeatures::Equals(const InstructionSetFeatures* other) const {
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if (GetInstructionSet() != other->GetInstructionSet()) {
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return false;
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}
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const X86InstructionSetFeatures* other_as_x86 = other->AsX86InstructionSetFeatures();
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return (has_SSSE3_ == other_as_x86->has_SSSE3_) &&
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(has_SSE4_1_ == other_as_x86->has_SSE4_1_) &&
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(has_SSE4_2_ == other_as_x86->has_SSE4_2_) &&
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(has_AVX_ == other_as_x86->has_AVX_) &&
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(has_AVX2_ == other_as_x86->has_AVX2_) &&
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(has_POPCNT_ == other_as_x86->has_POPCNT_);
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}
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bool X86InstructionSetFeatures::HasAtLeast(const InstructionSetFeatures* other) const {
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if (GetInstructionSet() != other->GetInstructionSet()) {
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return false;
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}
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const X86InstructionSetFeatures* other_as_x86 = other->AsX86InstructionSetFeatures();
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return (has_SSSE3_ || !other_as_x86->has_SSSE3_) &&
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(has_SSE4_1_ || !other_as_x86->has_SSE4_1_) &&
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(has_SSE4_2_ || !other_as_x86->has_SSE4_2_) &&
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(has_AVX_ || !other_as_x86->has_AVX_) &&
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(has_AVX2_ || !other_as_x86->has_AVX2_) &&
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(has_POPCNT_ || !other_as_x86->has_POPCNT_);
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}
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uint32_t X86InstructionSetFeatures::AsBitmap() const {
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return (has_SSSE3_ ? kSsse3Bitfield : 0) |
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(has_SSE4_1_ ? kSse4_1Bitfield : 0) |
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(has_SSE4_2_ ? kSse4_2Bitfield : 0) |
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(has_AVX_ ? kAvxBitfield : 0) |
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(has_AVX2_ ? kAvx2Bitfield : 0) |
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(has_POPCNT_ ? kPopCntBitfield : 0);
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}
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std::string X86InstructionSetFeatures::GetFeatureString() const {
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std::string result;
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if (has_SSSE3_) {
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result += "ssse3";
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} else {
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result += "-ssse3";
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}
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if (has_SSE4_1_) {
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result += ",sse4.1";
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} else {
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result += ",-sse4.1";
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}
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if (has_SSE4_2_) {
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result += ",sse4.2";
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} else {
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result += ",-sse4.2";
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}
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if (has_AVX_) {
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result += ",avx";
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} else {
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result += ",-avx";
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}
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if (has_AVX2_) {
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result += ",avx2";
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} else {
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result += ",-avx2";
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}
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if (has_POPCNT_) {
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result += ",popcnt";
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} else {
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result += ",-popcnt";
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}
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return result;
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}
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std::unique_ptr<const InstructionSetFeatures> X86InstructionSetFeatures::AddFeaturesFromSplitString(
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const std::vector<std::string>& features, bool x86_64,
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std::string* error_msg) const {
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bool has_SSSE3 = has_SSSE3_;
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bool has_SSE4_1 = has_SSE4_1_;
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bool has_SSE4_2 = has_SSE4_2_;
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bool has_AVX = has_AVX_;
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bool has_AVX2 = has_AVX2_;
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bool has_POPCNT = has_POPCNT_;
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for (const std::string& feature : features) {
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DCHECK_EQ(android::base::Trim(feature), feature)
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<< "Feature name is not trimmed: '" << feature << "'";
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if (feature == "ssse3") {
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has_SSSE3 = true;
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} else if (feature == "-ssse3") {
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has_SSSE3 = false;
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} else if (feature == "sse4.1") {
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has_SSE4_1 = true;
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} else if (feature == "-sse4.1") {
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has_SSE4_1 = false;
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} else if (feature == "sse4.2") {
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has_SSE4_2 = true;
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} else if (feature == "-sse4.2") {
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has_SSE4_2 = false;
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} else if (feature == "avx") {
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has_AVX = true;
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} else if (feature == "-avx") {
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has_AVX = false;
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} else if (feature == "avx2") {
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has_AVX2 = true;
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} else if (feature == "-avx2") {
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has_AVX2 = false;
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} else if (feature == "popcnt") {
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has_POPCNT = true;
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} else if (feature == "-popcnt") {
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has_POPCNT = false;
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} else {
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*error_msg = StringPrintf("Unknown instruction set feature: '%s'", feature.c_str());
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return nullptr;
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}
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}
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return Create(x86_64, has_SSSE3, has_SSE4_1, has_SSE4_2, has_AVX, has_AVX2, has_POPCNT);
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}
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} // namespace art
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