[llvm-mca] Default to the native host cpu if flag -mcpu is not specified.
llvm-svn: 330809
diff --git a/llvm/tools/llvm-mca/llvm-mca.cpp b/llvm/tools/llvm-mca/llvm-mca.cpp
index da0a362..0e1d18e 100644
--- a/llvm/tools/llvm-mca/llvm-mca.cpp
+++ b/llvm/tools/llvm-mca/llvm-mca.cpp
@@ -16,7 +16,7 @@
// -o <file>
//
// The target defaults to the host target.
-// The cpu defaults to 'generic'.
+// The cpu defaults to the 'native' host cpu.
// The output defaults to standard output.
//
//===----------------------------------------------------------------------===//
@@ -38,6 +38,7 @@
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
+#include "llvm/Support/Host.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileSystem.h"
@@ -69,7 +70,7 @@
static cl::opt<std::string>
MCPU("mcpu",
cl::desc("Target a specific cpu type (-mcpu=help for details)"),
- cl::value_desc("cpu-name"), cl::init("generic"));
+ cl::value_desc("cpu-name"), cl::init("native"));
static cl::opt<int>
OutputAsmVariant("output-asm-variant",
@@ -329,6 +330,10 @@
MCStreamerWrapper Str(Ctx, Regions);
std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
+
+ if (!MCPU.compare("native"))
+ MCPU = llvm::sys::getHostCPUName();
+
std::unique_ptr<MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, MCPU, /* FeaturesStr */ ""));
if (!STI->isCPUStringValid(MCPU))