Generate fpmath metadata when -ffast-math. Note that no optimizations are hooked

up to this yet.

llvm-svn: 154835

clang/lib/CodeGen/CodeGenFunction.cpp

@@ -22,8 +22,9 @@
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/StmtCXX.h"
 #include "clang/Frontend/CodeGenOptions.h"
-#include "llvm/Target/TargetData.h"
 #include "llvm/Intrinsics.h"
+#include "llvm/Support/MDBuilder.h"
+#include "llvm/Target/TargetData.h"
 using namespace clang;
 using namespace CodeGen;
 
@@ -41,6 +42,10 @@ CodeGenFunction::CodeGenFunction(CodeGenModule &cgm)
     TerminateHandler(0), TrapBB(0) {
 
   CatchUndefined = getContext().getLangOpts().CatchUndefined;
+  if (getContext().getLangOpts().FastMath) {
+    llvm::MDBuilder MDHelper(Builder.getContext());
+    Builder.SetDefaultFPMathTag(MDHelper.createFastFPMath());
+  }
   CGM.getCXXABI().getMangleContext().startNewFunction();
 }