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Implement getHostCPUName for ARM/linux. This will be used to implement -march=native in clang.

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The cpuid registers are only available in privileged mode so we don't have
an OS-independent way of implementing this. ARM doesn't provide a list of
processor IDs so the list is somewhat incomplete.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159228 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-06-26 21:36:32 +00:00
parent 275c85f1a7
commit 4750c1d804
1 changed files with 55 additions and 0 deletions
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55
lib/Support/Host.cpp
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@ -11,6 +11,7 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/DataStream.h"
@ -450,6 +451,60 @@ std::string sys::getHostCPUName() {
.Case("POWER7", "pwr7")
.Default(generic);
}
#elif defined(__linux__) && defined(__arm__)
std::string sys::getHostCPUName() {
// The cpuid register on arm is not accessible from user space. On Linux,
// it is exposed through the /proc/cpuinfo file.
// Note: We cannot mmap /proc/cpuinfo here and then process the resulting
// memory buffer because the 'file' has 0 size (it can be read from only
// as a stream).
std::string Err;
DataStreamer *DS = getDataFileStreamer("/proc/cpuinfo", &Err);
if (!DS) {
DEBUG(dbgs() << "Unable to open /proc/cpuinfo: " << Err << "\n");
return "generic";
}
// Read 1024 bytes from /proc/cpuinfo, which should contain the CPU part 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.
// Look for the CPU part line.
for (unsigned I = 0, E = Lines.size(); I != E; ++I)
if (Lines[I].startswith("CPU part"))
// The CPU part is a 3 digit hexadecimal number with a 0x prefix. The
// values correspond to the "Part number" in the CP15/c0 register. The
// contents are specified in the various processor manuals.
return StringSwitch<const char *>(Lines[I].substr(8).ltrim("\t :"))
.Case("0x926", "arm926ej-s")
.Case("0xb02", "mpcore")
.Case("0xb36", "arm1136j-s")
.Case("0xb56", "arm1156t2-s")
.Case("0xb76", "arm1176jz-s")
.Case("0xc08", "cortex-a8")
.Case("0xc09", "cortex-a9")
.Case("0xc20", "cortex-m0")
.Case("0xc23", "cortex-m3")
.Case("0xc24", "cortex-m4")
.Default("generic");
return "generic";
}
#else
std::string sys::getHostCPUName() {
return "generic";