Generate fpmath metadata when -ffast-math. Note that no optimizations are hooked
up to this yet.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154835 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CodeGenFunction.cpp b/lib/CodeGen/CodeGenFunction.cpp
index 9cbba06..f4b483b 100644
--- a/lib/CodeGen/CodeGenFunction.cpp
+++ b/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 @@
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();
}
diff --git a/test/CodeGen/2012-04-16-FastMath.c b/test/CodeGen/2012-04-16-FastMath.c
new file mode 100644
index 0000000..d7c3d9a
--- /dev/null
+++ b/test/CodeGen/2012-04-16-FastMath.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 %s -ffast-math -emit-llvm -o - | FileCheck %s
+
+double add(double x, double y) {
+// CHECK: @add
+ return x + y;
+// CHECK: fadd double %{{.}}, %{{.}}, !fpmath !0
+}
+// CHECK: !0 = metadata !{metadata !"fast"}
