6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-25 13:24:46 +00:00
Code Issues Projects Releases Wiki Activity

Make host ARM CPU feature detection independent of the vendor

Browse Source 
For ARM on linux we use /proc/cpuinfo to detect the host CPU's features.
Linux derives these values without ever looking at the vendor of the
specific CPU implementation. Hence, it adds little value, if we parse
the output of /proc/cpuinfo only for certain vendors.

This patch enables us to derive the correct feature flags e.g. for Qualcomm
CPUs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183790 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tobias Grosser
2013-06-11 21:45:01 +00:00
parent 1a4f2a33fb
commit a85644459c
1 changed files with 20 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
lib/Support/Host.cpp
View File

@@ -570,41 +570,31 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) {
SmallVector<StringRef, 32> Lines;
Str.split(Lines, "\n");
// Look for the CPU implementer line.
StringRef Implementer;
SmallVector<StringRef, 32> CPUFeatures;
// Look for the CPU features.
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);
if (Lines[I].startswith("Features")) {
Lines[I].split(CPUFeatures, " ");
break;
}
return true;
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 false;
return true;
}
#else
bool sys::getHostCPUFeatures(StringMap<bool> &Features){