runtime/arch/instruction_set_features.cc - LeafOS-Project/android_art - Gitiles

 /*
  * Copyright (C) 2011 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "instruction_set_features.h"

 #include <algorithm>
 #include <ostream>

 #include "android-base/strings.h"
 #include "arm/instruction_set_features_arm.h"
 #include "arm64/instruction_set_features_arm64.h"
 #include "base/casts.h"
 #include "base/utils.h"
 #include "riscv64/instruction_set_features_riscv64.h"
 #include "x86/instruction_set_features_x86.h"
 #include "x86_64/instruction_set_features_x86_64.h"

 namespace art HIDDEN {

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromVariant(
     InstructionSet isa, const std::string& variant, std::string* error_msg) {
   switch (isa) {
     case InstructionSet::kArm:
     case InstructionSet::kThumb2:
       return ArmInstructionSetFeatures::FromVariant(variant, error_msg);
     case InstructionSet::kArm64:
       return Arm64InstructionSetFeatures::FromVariant(variant, error_msg);
     case InstructionSet::kRiscv64:
       return Riscv64InstructionSetFeatures::FromVariant(variant, error_msg);
     case InstructionSet::kX86:
       return X86InstructionSetFeatures::FromVariant(variant, error_msg);
     case InstructionSet::kX86_64:
       return X86_64InstructionSetFeatures::FromVariant(variant, error_msg);

     default:
       break;
   }
   UNIMPLEMENTED(FATAL) << isa;
   UNREACHABLE();
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromVariantAndHwcap(
     InstructionSet isa, const std::string& variant, std::string* error_msg) {
   auto variant_features = FromVariant(isa, variant, error_msg);
   if (variant_features == nullptr) {
     return nullptr;
   }
   // Pixel3a is wrongly reporting itself as cortex-a75, so validate the features
   // with hwcaps.
   // Note that when cross-compiling on device (using dex2oat32 for compiling
   // arm64), the hwcaps will report that no feature is supported. This is
   // currently our best approach to be safe/correct. Maybe using the
   // cpu_features library could fix this issue.
   if (isa == InstructionSet::kArm64) {
     auto new_features = down_cast<const Arm64InstructionSetFeatures*>(variant_features.get())
         ->IntersectWithHwcap();
     if (!variant_features->Equals(new_features.get())) {
       LOG(WARNING) << "Mismatch between instruction set variant of device ("
             << *variant_features
             << ") and features returned by the hardware (" << *new_features << ")";
     }
     return new_features;
   } else {
     // TODO: Implement this validation on all architectures.
     return variant_features;
   }
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromBitmap(InstructionSet isa,
                                                                                  uint32_t bitmap) {
   std::unique_ptr<const InstructionSetFeatures> result;
   switch (isa) {
     case InstructionSet::kArm:
     case InstructionSet::kThumb2:
       result = ArmInstructionSetFeatures::FromBitmap(bitmap);
       break;
     case InstructionSet::kArm64:
       result = Arm64InstructionSetFeatures::FromBitmap(bitmap);
       break;
     case InstructionSet::kRiscv64:
       result = Riscv64InstructionSetFeatures::FromBitmap(bitmap);
       break;
     case InstructionSet::kX86:
       result = X86InstructionSetFeatures::FromBitmap(bitmap);
       break;
     case InstructionSet::kX86_64:
       result = X86_64InstructionSetFeatures::FromBitmap(bitmap);
       break;

     default:
       UNIMPLEMENTED(FATAL) << isa;
       UNREACHABLE();
   }
   CHECK_EQ(bitmap, result->AsBitmap());
   return result;
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromCppDefines() {
   switch (kRuntimeISA) {
     case InstructionSet::kArm:
     case InstructionSet::kThumb2:
       return ArmInstructionSetFeatures::FromCppDefines();
     case InstructionSet::kArm64:
       return Arm64InstructionSetFeatures::FromCppDefines();
     case InstructionSet::kRiscv64:
       return Riscv64InstructionSetFeatures::FromCppDefines();
     case InstructionSet::kX86:
       return X86InstructionSetFeatures::FromCppDefines();
     case InstructionSet::kX86_64:
       return X86_64InstructionSetFeatures::FromCppDefines();

     default:
       break;
   }
   UNIMPLEMENTED(FATAL) << kRuntimeISA;
   UNREACHABLE();
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromRuntimeDetection() {
   switch (kRuntimeISA) {
 #ifdef ART_TARGET_ANDROID
     case InstructionSet::kArm64:
       return Arm64InstructionSetFeatures::FromHwcap();
 #endif
     default:
       return nullptr;
   }
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromCpuInfo() {
   switch (kRuntimeISA) {
     case InstructionSet::kArm:
     case InstructionSet::kThumb2:
       return ArmInstructionSetFeatures::FromCpuInfo();
     case InstructionSet::kArm64:
       return Arm64InstructionSetFeatures::FromCpuInfo();
     case InstructionSet::kRiscv64:
       return Riscv64InstructionSetFeatures::FromCpuInfo();
     case InstructionSet::kX86:
       return X86InstructionSetFeatures::FromCpuInfo();
     case InstructionSet::kX86_64:
       return X86_64InstructionSetFeatures::FromCpuInfo();

     default:
       break;
   }
   UNIMPLEMENTED(FATAL) << kRuntimeISA;
   UNREACHABLE();
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromHwcap() {
   switch (kRuntimeISA) {
     case InstructionSet::kArm:
     case InstructionSet::kThumb2:
       return ArmInstructionSetFeatures::FromHwcap();
     case InstructionSet::kArm64:
       return Arm64InstructionSetFeatures::FromHwcap();
     case InstructionSet::kRiscv64:
       return Riscv64InstructionSetFeatures::FromHwcap();
     case InstructionSet::kX86:
       return X86InstructionSetFeatures::FromHwcap();
     case InstructionSet::kX86_64:
       return X86_64InstructionSetFeatures::FromHwcap();

     default:
       break;
   }
   UNIMPLEMENTED(FATAL) << kRuntimeISA;
   UNREACHABLE();
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromAssembly() {
   switch (kRuntimeISA) {
     case InstructionSet::kArm:
     case InstructionSet::kThumb2:
       return ArmInstructionSetFeatures::FromAssembly();
     case InstructionSet::kArm64:
       return Arm64InstructionSetFeatures::FromAssembly();
     case InstructionSet::kRiscv64:
       return Riscv64InstructionSetFeatures::FromAssembly();
     case InstructionSet::kX86:
       return X86InstructionSetFeatures::FromAssembly();
     case InstructionSet::kX86_64:
       return X86_64InstructionSetFeatures::FromAssembly();

     default:
       break;
   }
   UNIMPLEMENTED(FATAL) << kRuntimeISA;
   UNREACHABLE();
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromCpuFeatures() {
   switch (kRuntimeISA) {
     case InstructionSet::kArm:
     case InstructionSet::kThumb2:
       return ArmInstructionSetFeatures::FromCpuFeatures();
     case InstructionSet::kArm64:
       return Arm64InstructionSetFeatures::FromCpuFeatures();
     case InstructionSet::kRiscv64:
       return Riscv64InstructionSetFeatures::FromCpuFeatures();
     case InstructionSet::kX86:
       return X86InstructionSetFeatures::FromCpuFeatures();
     case InstructionSet::kX86_64:
       return X86_64InstructionSetFeatures::FromCpuFeatures();

     default:
       break;
   }
   UNIMPLEMENTED(FATAL) << kRuntimeISA;
   UNREACHABLE();
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::AddFeaturesFromString(
     const std::string& feature_list, /* out */ std::string* error_msg) const {
   std::vector<std::string> features;
   Split(feature_list, ',', &features);
   std::transform(std::begin(features), std::end(features), std::begin(features),
                  [](const std::string &s) { return android::base::Trim(s); });
   auto empty_strings_begin = std::copy_if(std::begin(features), std::end(features),
                                           std::begin(features),
                                           [](const std::string& s) { return !s.empty(); });
   features.erase(empty_strings_begin, std::end(features));
   if (features.empty()) {
     *error_msg = "No instruction set features specified";
     return nullptr;
   }

   bool use_default = false;
   bool use_runtime_detection = false;
   for (const std::string& feature : features) {
     if (feature == "default") {
       if (features.size() > 1) {
         *error_msg = "Specific instruction set feature(s) cannot be used when 'default' is used.";
         return nullptr;
       }
       use_default = true;
       features.pop_back();
       break;
     } else if (feature == "runtime") {
       if (features.size() > 1) {
         *error_msg = "Specific instruction set feature(s) cannot be used when 'runtime' is used.";
         return nullptr;
       }
       use_runtime_detection = true;
       features.pop_back();
       break;
     }
   }
   // Expectation: "default" and "runtime" are standalone, no other feature names.
   // But an empty features vector after processing can also come along if the
   // handled feature names  are the only ones in the list. So
   // logically, we check "default or runtime => features.empty."
   DCHECK((!use_default && !use_runtime_detection) || features.empty());

   std::unique_ptr<const InstructionSetFeatures> runtime_detected_features;
   if (use_runtime_detection) {
     runtime_detected_features = FromRuntimeDetection();
   }

   if (runtime_detected_features != nullptr) {
     return AddRuntimeDetectedFeatures(runtime_detected_features.get());
   } else {
     return AddFeaturesFromSplitString(features, error_msg);
   }
 }

 const ArmInstructionSetFeatures* InstructionSetFeatures::AsArmInstructionSetFeatures() const {
   DCHECK_EQ(InstructionSet::kArm, GetInstructionSet());
   return down_cast<const ArmInstructionSetFeatures*>(this);
 }

 const Arm64InstructionSetFeatures* InstructionSetFeatures::AsArm64InstructionSetFeatures() const {
   DCHECK_EQ(InstructionSet::kArm64, GetInstructionSet());
   return down_cast<const Arm64InstructionSetFeatures*>(this);
 }

 const Riscv64InstructionSetFeatures* InstructionSetFeatures::AsRiscv64InstructionSetFeatures()
     const {
   DCHECK_EQ(InstructionSet::kRiscv64, GetInstructionSet());
   return down_cast<const Riscv64InstructionSetFeatures*>(this);
 }

 const X86InstructionSetFeatures* InstructionSetFeatures::AsX86InstructionSetFeatures() const {
   DCHECK(InstructionSet::kX86 == GetInstructionSet() ||
          InstructionSet::kX86_64 == GetInstructionSet());
   return down_cast<const X86InstructionSetFeatures*>(this);
 }

 const X86_64InstructionSetFeatures* InstructionSetFeatures::AsX86_64InstructionSetFeatures() const {
   DCHECK_EQ(InstructionSet::kX86_64, GetInstructionSet());
   return down_cast<const X86_64InstructionSetFeatures*>(this);
 }

 bool InstructionSetFeatures::FindVariantInArray(const char* const variants[], size_t num_variants,
                                                 const std::string& variant) {
   const char* const * begin = variants;
   const char* const * end = begin + num_variants;
   return std::find(begin, end, variant) != end;
 }

 std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::AddRuntimeDetectedFeatures(
     [[maybe_unused]] const InstructionSetFeatures* features) const {
   UNIMPLEMENTED(FATAL) << kRuntimeISA;
   UNREACHABLE();
 }

 std::ostream& operator<<(std::ostream& os, const InstructionSetFeatures& rhs) {
   os << "ISA: " << rhs.GetInstructionSet() << " Feature string: " << rhs.GetFeatureString();
   return os;
 }

 }  // namespace art
	/*
	* Copyright (C) 2011 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "instruction_set_features.h"

	#include <algorithm>
	#include <ostream>

	#include "android-base/strings.h"
	#include "arm/instruction_set_features_arm.h"
	#include "arm64/instruction_set_features_arm64.h"
	#include "base/casts.h"
	#include "base/utils.h"
	#include "riscv64/instruction_set_features_riscv64.h"
	#include "x86/instruction_set_features_x86.h"
	#include "x86_64/instruction_set_features_x86_64.h"

	namespace art HIDDEN {

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromVariant(
	InstructionSet isa, const std::string& variant, std::string* error_msg) {
	switch (isa) {
	case InstructionSet::kArm:
	case InstructionSet::kThumb2:
	return ArmInstructionSetFeatures::FromVariant(variant, error_msg);
	case InstructionSet::kArm64:
	return Arm64InstructionSetFeatures::FromVariant(variant, error_msg);
	case InstructionSet::kRiscv64:
	return Riscv64InstructionSetFeatures::FromVariant(variant, error_msg);
	case InstructionSet::kX86:
	return X86InstructionSetFeatures::FromVariant(variant, error_msg);
	case InstructionSet::kX86_64:
	return X86_64InstructionSetFeatures::FromVariant(variant, error_msg);

	default:
	break;
	}
	UNIMPLEMENTED(FATAL) << isa;
	UNREACHABLE();
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromVariantAndHwcap(
	InstructionSet isa, const std::string& variant, std::string* error_msg) {
	auto variant_features = FromVariant(isa, variant, error_msg);
	if (variant_features == nullptr) {
	return nullptr;
	}
	// Pixel3a is wrongly reporting itself as cortex-a75, so validate the features
	// with hwcaps.
	// Note that when cross-compiling on device (using dex2oat32 for compiling
	// arm64), the hwcaps will report that no feature is supported. This is
	// currently our best approach to be safe/correct. Maybe using the
	// cpu_features library could fix this issue.
	if (isa == InstructionSet::kArm64) {
	auto new_features = down_cast<const Arm64InstructionSetFeatures*>(variant_features.get())
	->IntersectWithHwcap();
	if (!variant_features->Equals(new_features.get())) {
	LOG(WARNING) << "Mismatch between instruction set variant of device ("
	<< *variant_features
	<< ") and features returned by the hardware (" << *new_features << ")";
	}
	return new_features;
	} else {
	// TODO: Implement this validation on all architectures.
	return variant_features;
	}
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromBitmap(InstructionSet isa,
	uint32_t bitmap) {
	std::unique_ptr<const InstructionSetFeatures> result;
	switch (isa) {
	case InstructionSet::kArm:
	case InstructionSet::kThumb2:
	result = ArmInstructionSetFeatures::FromBitmap(bitmap);
	break;
	case InstructionSet::kArm64:
	result = Arm64InstructionSetFeatures::FromBitmap(bitmap);
	break;
	case InstructionSet::kRiscv64:
	result = Riscv64InstructionSetFeatures::FromBitmap(bitmap);
	break;
	case InstructionSet::kX86:
	result = X86InstructionSetFeatures::FromBitmap(bitmap);
	break;
	case InstructionSet::kX86_64:
	result = X86_64InstructionSetFeatures::FromBitmap(bitmap);
	break;

	default:
	UNIMPLEMENTED(FATAL) << isa;
	UNREACHABLE();
	}
	CHECK_EQ(bitmap, result->AsBitmap());
	return result;
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromCppDefines() {
	switch (kRuntimeISA) {
	case InstructionSet::kArm:
	case InstructionSet::kThumb2:
	return ArmInstructionSetFeatures::FromCppDefines();
	case InstructionSet::kArm64:
	return Arm64InstructionSetFeatures::FromCppDefines();
	case InstructionSet::kRiscv64:
	return Riscv64InstructionSetFeatures::FromCppDefines();
	case InstructionSet::kX86:
	return X86InstructionSetFeatures::FromCppDefines();
	case InstructionSet::kX86_64:
	return X86_64InstructionSetFeatures::FromCppDefines();

	default:
	break;
	}
	UNIMPLEMENTED(FATAL) << kRuntimeISA;
	UNREACHABLE();
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromRuntimeDetection() {
	switch (kRuntimeISA) {
	#ifdef ART_TARGET_ANDROID
	case InstructionSet::kArm64:
	return Arm64InstructionSetFeatures::FromHwcap();
	#endif
	default:
	return nullptr;
	}
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromCpuInfo() {
	switch (kRuntimeISA) {
	case InstructionSet::kArm:
	case InstructionSet::kThumb2:
	return ArmInstructionSetFeatures::FromCpuInfo();
	case InstructionSet::kArm64:
	return Arm64InstructionSetFeatures::FromCpuInfo();
	case InstructionSet::kRiscv64:
	return Riscv64InstructionSetFeatures::FromCpuInfo();
	case InstructionSet::kX86:
	return X86InstructionSetFeatures::FromCpuInfo();
	case InstructionSet::kX86_64:
	return X86_64InstructionSetFeatures::FromCpuInfo();

	default:
	break;
	}
	UNIMPLEMENTED(FATAL) << kRuntimeISA;
	UNREACHABLE();
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromHwcap() {
	switch (kRuntimeISA) {
	case InstructionSet::kArm:
	case InstructionSet::kThumb2:
	return ArmInstructionSetFeatures::FromHwcap();
	case InstructionSet::kArm64:
	return Arm64InstructionSetFeatures::FromHwcap();
	case InstructionSet::kRiscv64:
	return Riscv64InstructionSetFeatures::FromHwcap();
	case InstructionSet::kX86:
	return X86InstructionSetFeatures::FromHwcap();
	case InstructionSet::kX86_64:
	return X86_64InstructionSetFeatures::FromHwcap();

	default:
	break;
	}
	UNIMPLEMENTED(FATAL) << kRuntimeISA;
	UNREACHABLE();
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromAssembly() {
	switch (kRuntimeISA) {
	case InstructionSet::kArm:
	case InstructionSet::kThumb2:
	return ArmInstructionSetFeatures::FromAssembly();
	case InstructionSet::kArm64:
	return Arm64InstructionSetFeatures::FromAssembly();
	case InstructionSet::kRiscv64:
	return Riscv64InstructionSetFeatures::FromAssembly();
	case InstructionSet::kX86:
	return X86InstructionSetFeatures::FromAssembly();
	case InstructionSet::kX86_64:
	return X86_64InstructionSetFeatures::FromAssembly();

	default:
	break;
	}
	UNIMPLEMENTED(FATAL) << kRuntimeISA;
	UNREACHABLE();
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::FromCpuFeatures() {
	switch (kRuntimeISA) {
	case InstructionSet::kArm:
	case InstructionSet::kThumb2:
	return ArmInstructionSetFeatures::FromCpuFeatures();
	case InstructionSet::kArm64:
	return Arm64InstructionSetFeatures::FromCpuFeatures();
	case InstructionSet::kRiscv64:
	return Riscv64InstructionSetFeatures::FromCpuFeatures();
	case InstructionSet::kX86:
	return X86InstructionSetFeatures::FromCpuFeatures();
	case InstructionSet::kX86_64:
	return X86_64InstructionSetFeatures::FromCpuFeatures();

	default:
	break;
	}
	UNIMPLEMENTED(FATAL) << kRuntimeISA;
	UNREACHABLE();
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::AddFeaturesFromString(
	const std::string& feature_list, /* out / std::string error_msg) const {
	std::vector<std::string> features;
	Split(feature_list, ',', &features);
	std::transform(std::begin(features), std::end(features), std::begin(features),
	[](const std::string &s) { return android::base::Trim(s); });
	auto empty_strings_begin = std::copy_if(std::begin(features), std::end(features),
	std::begin(features),
	[](const std::string& s) { return !s.empty(); });
	features.erase(empty_strings_begin, std::end(features));
	if (features.empty()) {
	*error_msg = "No instruction set features specified";
	return nullptr;
	}

	bool use_default = false;
	bool use_runtime_detection = false;
	for (const std::string& feature : features) {
	if (feature == "default") {
	if (features.size() > 1) {
	*error_msg = "Specific instruction set feature(s) cannot be used when 'default' is used.";
	return nullptr;
	}
	use_default = true;
	features.pop_back();
	break;
	} else if (feature == "runtime") {
	if (features.size() > 1) {
	*error_msg = "Specific instruction set feature(s) cannot be used when 'runtime' is used.";
	return nullptr;
	}
	use_runtime_detection = true;
	features.pop_back();
	break;
	}
	}
	// Expectation: "default" and "runtime" are standalone, no other feature names.
	// But an empty features vector after processing can also come along if the
	// handled feature names are the only ones in the list. So
	// logically, we check "default or runtime => features.empty."
	DCHECK((!use_default && !use_runtime_detection) \|\| features.empty());

	std::unique_ptr<const InstructionSetFeatures> runtime_detected_features;
	if (use_runtime_detection) {
	runtime_detected_features = FromRuntimeDetection();
	}

	if (runtime_detected_features != nullptr) {
	return AddRuntimeDetectedFeatures(runtime_detected_features.get());
	} else {
	return AddFeaturesFromSplitString(features, error_msg);
	}
	}

	const ArmInstructionSetFeatures* InstructionSetFeatures::AsArmInstructionSetFeatures() const {
	DCHECK_EQ(InstructionSet::kArm, GetInstructionSet());
	return down_cast<const ArmInstructionSetFeatures*>(this);
	}

	const Arm64InstructionSetFeatures* InstructionSetFeatures::AsArm64InstructionSetFeatures() const {
	DCHECK_EQ(InstructionSet::kArm64, GetInstructionSet());
	return down_cast<const Arm64InstructionSetFeatures*>(this);
	}

	const Riscv64InstructionSetFeatures* InstructionSetFeatures::AsRiscv64InstructionSetFeatures()
	const {
	DCHECK_EQ(InstructionSet::kRiscv64, GetInstructionSet());
	return down_cast<const Riscv64InstructionSetFeatures*>(this);
	}

	const X86InstructionSetFeatures* InstructionSetFeatures::AsX86InstructionSetFeatures() const {
	DCHECK(InstructionSet::kX86 == GetInstructionSet() \|\|
	InstructionSet::kX86_64 == GetInstructionSet());
	return down_cast<const X86InstructionSetFeatures*>(this);
	}

	const X86_64InstructionSetFeatures* InstructionSetFeatures::AsX86_64InstructionSetFeatures() const {
	DCHECK_EQ(InstructionSet::kX86_64, GetInstructionSet());
	return down_cast<const X86_64InstructionSetFeatures*>(this);
	}

	bool InstructionSetFeatures::FindVariantInArray(const char* const variants[], size_t num_variants,
	const std::string& variant) {
	const char* const * begin = variants;
	const char* const * end = begin + num_variants;
	return std::find(begin, end, variant) != end;
	}

	std::unique_ptr<const InstructionSetFeatures> InstructionSetFeatures::AddRuntimeDetectedFeatures(
	[[maybe_unused]] const InstructionSetFeatures* features) const {
	UNIMPLEMENTED(FATAL) << kRuntimeISA;
	UNREACHABLE();
	}

	std::ostream& operator<<(std::ostream& os, const InstructionSetFeatures& rhs) {
	os << "ISA: " << rhs.GetInstructionSet() << " Feature string: " << rhs.GetFeatureString();
	return os;
	}

	} // namespace art