diff options
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | 4 | ||||
| -rw-r--r-- | llvm/test/Transforms/InstCombine/fdiv.ll | 8 |
2 files changed, 11 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp index 94461c5f84a..f61d82340b5 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp @@ -1050,8 +1050,10 @@ Instruction *InstCombiner::visitFDiv(BinaryOperator &I) { } // X / C => X * 1/C - if (Instruction *T = CvtFDivConstToReciprocal(Op0, Op1C, AllowReciprocal)) + if (Instruction *T = CvtFDivConstToReciprocal(Op0, Op1C, AllowReciprocal)) { + T->copyFastMathFlags(&I); return T; + } return 0; } diff --git a/llvm/test/Transforms/InstCombine/fdiv.ll b/llvm/test/Transforms/InstCombine/fdiv.ll index 1edbc5ecd60..c3aabd78666 100644 --- a/llvm/test/Transforms/InstCombine/fdiv.ll +++ b/llvm/test/Transforms/InstCombine/fdiv.ll @@ -23,3 +23,11 @@ define float @test3(float %x) nounwind readnone ssp { ; CHECK-LABEL: @test3( ; CHECK-NEXT: fdiv float %x, 0x36A0000000000000 } + +define float @test4(float %x) nounwind readnone ssp { + %div = fdiv fast float %x, 8.0 + ret float %div + +; CHECK-LABEL: @test4( +; CHECK-NEXT: fmul fast float %x, 1.250000e-01 +} |
