diff options
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp index 2171c819fd9..53bcaeb98b4 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp @@ -1622,6 +1622,11 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &FPT) { Value *X; Instruction *Op = dyn_cast<Instruction>(FPT.getOperand(0)); if (Op && Op->hasOneUse()) { + // FIXME: The FMF should propagate from the fptrunc, not the source op. + IRBuilder<>::FastMathFlagGuard FMFG(Builder); + if (isa<FPMathOperator>(Op)) + Builder.setFastMathFlags(Op->getFastMathFlags()); + if (match(Op, m_FNeg(m_Value(X)))) { Value *InnerTrunc = Builder.CreateFPTrunc(X, Ty); |
