mirror of
https://github.com/google/cpu_features.git
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59 lines
2.2 KiB
C
59 lines
2.2 KiB
C
// Copyright 2017 Google LLC
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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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#include "cpu_features_macros.h"
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#ifdef CPU_FEATURES_ARCH_X86
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#if defined(CPU_FEATURES_OS_LINUX) || defined(CPU_FEATURES_OS_ANDROID)
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#include "impl_x86__base_implementation.inl"
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static void OverrideOsPreserves(OsPreserves* os_preserves) {
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(void)os_preserves;
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// No override
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}
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#include "internal/filesystem.h"
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#include "internal/stack_line_reader.h"
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#include "internal/string_view.h"
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static void DetectFeaturesFromOs(X86Info* info, X86Features* features) {
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(void)info;
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// Handling Linux platform through /proc/cpuinfo.
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const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
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if (fd >= 0) {
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StackLineReader reader;
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StackLineReader_Initialize(&reader, fd);
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for (bool stop = false; !stop;) {
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const LineResult result = StackLineReader_NextLine(&reader);
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if (result.eof) stop = true;
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const StringView line = result.line;
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StringView key, value;
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if (!CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value))
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continue;
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if (!CpuFeatures_StringView_IsEquals(key, str("flags"))) continue;
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features->sse = CpuFeatures_StringView_HasWord(value, "sse", ' ');
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features->sse2 = CpuFeatures_StringView_HasWord(value, "sse2", ' ');
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features->sse3 = CpuFeatures_StringView_HasWord(value, "pni", ' ');
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features->ssse3 = CpuFeatures_StringView_HasWord(value, "ssse3", ' ');
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features->sse4_1 = CpuFeatures_StringView_HasWord(value, "sse4_1", ' ');
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features->sse4_2 = CpuFeatures_StringView_HasWord(value, "sse4_2", ' ');
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break;
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}
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CpuFeatures_CloseFile(fd);
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}
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}
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#endif // defined(CPU_FEATURES_OS_LINUX) || defined(CPU_FEATURES_OS_ANDROID)
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#endif // CPU_FEATURES_ARCH_X86
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