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Allow specifying a CPU to llvm-mc, so that we can properly set up subtarget

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feature lists for instruction pattern predicates.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117788 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-10-30 15:57:50 +00:00
parent 7644971232
commit d2f14256f0
1 changed files with 20 additions and 1 deletions
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21
tools/llvm-mc/llvm-mc.cpp
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@ -23,6 +23,7 @@
#include "llvm/Target/TargetAsmParser.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Target/SubtargetFeature.h" // FIXME.
#include "llvm/Target/TargetMachine.h" // FIXME.
#include "llvm/Target/TargetSelect.h"
#include "llvm/ADT/OwningPtr.h"
@ -95,6 +96,12 @@ static cl::opt<std::string>
TripleName("triple", cl::desc("Target triple to assemble for, "
"see -version for available targets"));
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(""));
static cl::opt<bool>
NoInitialTextSection("n", cl::desc(
"Don't assume assembly file starts in the text section"));
@ -301,8 +308,20 @@ static int AssembleInput(const char *ProgName) {
MCContext Ctx(*MAI);
// Package up features to be passed to target/subtarget
std::string FeaturesStr;
if (MCPU.size()) {
SubtargetFeatures Features;
Features.setCPU(MCPU);
FeaturesStr = Features.getString();
}
// FIXME: We shouldn't need to do this (and link in codegen).
OwningPtr<TargetMachine> TM(TheTarget->createTargetMachine(TripleName, ""));
// When we split this out, we should do it in a way that makes
// it straightforward to switch subtargets on the fly (.e.g,
// the .cpu and .code16 directives).
OwningPtr<TargetMachine> TM(TheTarget->createTargetMachine(TripleName,
FeaturesStr));
if (!TM) {
errs() << ProgName << ": error: could not create target for triple '"