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

up to this yet.

llvm-svn: 154835
This commit is contained in:
Duncan Sands 2012-04-16 17:24:31 +00:00
parent dfc9ab2c16
commit 8030b810de
2 changed files with 14 additions and 1 deletions
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7
clang/lib/CodeGen/CodeGenFunction.cpp
View File

@ -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();
}

8
clang/test/CodeGen/2012-04-16-FastMath.c Normal file
View File

@ -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"}