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Define getHostCPUFeatures for ARM Linux platform

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170085 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hao Liu 2012-12-13 02:40:20 +00:00
parent c567b1cd0d
commit fde71f4f25
1 changed files with 58 additions and 0 deletions
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58
lib/Support/Host.cpp
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@ -517,6 +517,64 @@ std::string sys::getHostCPUName() {
}
#endif
#if defined(__linux__) && defined(__arm__)
bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
std::string Err;
DataStreamer *DS = getDataFileStreamer("/proc/cpuinfo", &Err);
if (!DS) {
DEBUG(dbgs() << "Unable to open /proc/cpuinfo: " << Err << "\n");
return false;
}
// Read 1024 bytes from /proc/cpuinfo, which should contain the Features line
// in all cases.
char buffer[1024];
size_t CPUInfoSize = DS->GetBytes((unsigned char*) buffer, sizeof(buffer));
delete DS;
StringRef Str(buffer, CPUInfoSize);
SmallVector<StringRef, 32> Lines;
Str.split(Lines, "\n");
// Look for the CPU implementer line.
StringRef Implementer;
for (unsigned I = 0, E = Lines.size(); I != E; ++I)
if (Lines[I].startswith("CPU implementer"))
Implementer = Lines[I].substr(15).ltrim("\t :");
if (Implementer == "0x41") { // ARM Ltd.
SmallVector<StringRef, 32> CPUFeatures;
// Look for the CPU features.
for (unsigned I = 0, E = Lines.size(); I != E; ++I)
if (Lines[I].startswith("Features")) {
Lines[I].split(CPUFeatures, " ");
break;
}
for (unsigned I = 0, E = CPUFeatures.size(); I != E; ++I) {
StringRef LLVMFeatureStr = StringSwitch<StringRef>(CPUFeatures[I])
.Case("half", "fp16")
.Case("neon", "neon")
.Case("vfpv3", "vfp3")
.Case("vfpv3d16", "d16")
.Case("vfpv4", "vfp4")
.Case("idiva", "hwdiv-arm")
.Case("idivt", "hwdiv")
.Default("");
if (LLVMFeatureStr != "")
Features.GetOrCreateValue(LLVMFeatureStr).setValue(true);
}
return true;
}
return false;
}
#else
bool sys::getHostCPUFeatures(StringMap<bool> &Features){
return false;
}
#endif