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Define getHostCPUFeatures for ARM Linux platform
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170085 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -517,6 +517,64 @@ std::string sys::getHostCPUName() {
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}
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#endif
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#if defined(__linux__) && defined(__arm__)
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bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
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std::string Err;
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DataStreamer *DS = getDataFileStreamer("/proc/cpuinfo", &Err);
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if (!DS) {
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DEBUG(dbgs() << "Unable to open /proc/cpuinfo: " << Err << "\n");
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return false;
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}
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// Read 1024 bytes from /proc/cpuinfo, which should contain the Features line
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// in all cases.
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char buffer[1024];
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size_t CPUInfoSize = DS->GetBytes((unsigned char*) buffer, sizeof(buffer));
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delete DS;
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StringRef Str(buffer, CPUInfoSize);
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SmallVector<StringRef, 32> Lines;
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Str.split(Lines, "\n");
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// Look for the CPU implementer line.
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StringRef Implementer;
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for (unsigned I = 0, E = Lines.size(); I != E; ++I)
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if (Lines[I].startswith("CPU implementer"))
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Implementer = Lines[I].substr(15).ltrim("\t :");
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if (Implementer == "0x41") { // ARM Ltd.
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SmallVector<StringRef, 32> CPUFeatures;
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// Look for the CPU features.
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for (unsigned I = 0, E = Lines.size(); I != E; ++I)
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if (Lines[I].startswith("Features")) {
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Lines[I].split(CPUFeatures, " ");
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break;
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}
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for (unsigned I = 0, E = CPUFeatures.size(); I != E; ++I) {
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StringRef LLVMFeatureStr = StringSwitch<StringRef>(CPUFeatures[I])
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.Case("half", "fp16")
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.Case("neon", "neon")
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.Case("vfpv3", "vfp3")
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.Case("vfpv3d16", "d16")
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.Case("vfpv4", "vfp4")
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.Case("idiva", "hwdiv-arm")
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.Case("idivt", "hwdiv")
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.Default("");
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if (LLVMFeatureStr != "")
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Features.GetOrCreateValue(LLVMFeatureStr).setValue(true);
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}
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return true;
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}
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return false;
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}
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#else
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bool sys::getHostCPUFeatures(StringMap<bool> &Features){
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return false;
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}
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#endif
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