diff options
Diffstat (limited to 'clang/lib/CodeGen/CGExprComplex.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CGExprComplex.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/clang/lib/CodeGen/CGExprComplex.cpp b/clang/lib/CodeGen/CGExprComplex.cpp index e532794b71bd..839fe16cd772 100644 --- a/clang/lib/CodeGen/CGExprComplex.cpp +++ b/clang/lib/CodeGen/CGExprComplex.cpp @@ -892,6 +892,9 @@ ComplexPairTy ComplexExprEmitter::EmitRangeReductionDiv(llvm::Value *LHSr, llvm::Value *LHSi, llvm::Value *RHSr, llvm::Value *RHSi) { + // FIXME: This could eventually be replaced by an LLVM intrinsic to + // avoid this long IR sequence. + // (a + ib) / (c + id) = (e + if) llvm::Value *FAbsRHSr = EmitllvmFAbs(CGF, RHSr); // |c| llvm::Value *FAbsRHSi = EmitllvmFAbs(CGF, RHSi); // |d| @@ -936,7 +939,7 @@ ComplexPairTy ComplexExprEmitter::EmitRangeReductionDiv(llvm::Value *LHSr, llvm::Value *RC = Builder.CreateFMul(CdD, RHSr); // rc llvm::Value *DpRC = Builder.CreateFAdd(RHSi, RC); // tmp=d+rc - llvm::Value *T7 = Builder.CreateFMul(LHSr, RC); // ar + llvm::Value *T7 = Builder.CreateFMul(LHSr, CdD); // ar llvm::Value *T8 = Builder.CreateFAdd(T7, LHSi); // ar+b llvm::Value *DSTFr = Builder.CreateFDiv(T8, DpRC); // (ar+b)/tmp @@ -978,7 +981,10 @@ ComplexPairTy ComplexExprEmitter::EmitBinDiv(const BinOpInfo &Op) { return EmitRangeReductionDiv(LHSr, LHSi, RHSr, RHSi); else if (Op.FPFeatures.getComplexRange() == LangOptions::CX_Limited) return EmitAlgebraicDiv(LHSr, LHSi, RHSr, RHSi); - else if (!CGF.getLangOpts().FastMath) { + else if (!CGF.getLangOpts().FastMath || + // '-ffast-math' is used in the command line but followed by an + // '-fno-cx-limited-range'. + Op.FPFeatures.getComplexRange() == LangOptions::CX_Full) { LHSi = OrigLHSi; // If we have a complex operand on the RHS and FastMath is not allowed, we // delegate to a libcall to handle all of the complexities and minimize |