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-rw-r--r--tools/opt/opt.cpp52
1 files changed, 48 insertions, 4 deletions
diff --git a/tools/opt/opt.cpp b/tools/opt/opt.cpp
index 1d8ce57..fcf98ae 100644
--- a/tools/opt/opt.cpp
+++ b/tools/opt/opt.cpp
@@ -22,6 +22,8 @@
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetMachineRegistry.h"
+#include "llvm/Target/SubtargetFeature.h"
#include "llvm/Support/PassNameParser.h"
#include "llvm/System/Signals.h"
#include "llvm/Support/ManagedStatic.h"
@@ -93,6 +95,22 @@ QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
static cl::opt<bool>
AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
+static cl::opt<const TargetMachineRegistry::entry*, false,
+ TargetMachineRegistry::Parser>
+MArch("march", cl::desc("Architecture to generate code for:"));
+
+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::list<std::string>
+MAttrs("mattr",
+ cl::CommaSeparated,
+ cl::desc("Target specific attributes (-mattr=help for details)"),
+ cl::value_desc("a1,+a2,-a3,..."));
+
// ---------- Define Printers for module and function passes ------------
namespace {
@@ -308,6 +326,36 @@ void AddStandardCompilePasses(PassManager &PM) {
//===----------------------------------------------------------------------===//
// main for opt
//
+
+TargetMachine *getTargetMachine(Module &Mod) {
+
+ if (MArch == 0) {
+ std::string Err;
+ MArch =
+ TargetMachineRegistry::getClosestStaticTargetForModule(Mod, Err);
+ if (MArch == 0) {
+ std::cerr << "Error auto-selecting target for module '"
+ << Err << "'. Please use the -march option to explicitly "
+ << "pick a target.\n";
+ return NULL;
+ }
+ }
+
+ // Package up features to be passed to target/subtarget
+ std::string FeaturesStr;
+ if (MCPU.size() || MAttrs.size()) {
+ SubtargetFeatures Features;
+ Features.setCPU(MCPU);
+ for (unsigned i = 0; i != MAttrs.size(); ++i)
+ Features.AddFeature(MAttrs[i]);
+ FeaturesStr = Features.getString();
+ }
+
+ TargetMachine *Target = MArch->CtorFn(Mod, FeaturesStr);
+ assert(Target && "Could not allocate target machine!");
+ return Target;
+}
+
int main(int argc, char **argv) {
llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
try {
@@ -315,10 +363,6 @@ int main(int argc, char **argv) {
"llvm .bc -> .bc modular optimizer and analysis printer\n");
sys::PrintStackTraceOnErrorSignal();
- // Allocate a full target machine description only if necessary.
- // FIXME: The choice of target should be controllable on the command line.
- std::auto_ptr<TargetMachine> target;
-
std::string ErrorMessage;
// Load the input module...