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Fix an instance where we would drop fast math flags when performing an fdiv to reciprocal multiply transformation.

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llvm-svn: 199425
This commit is contained in:
Owen Anderson 2014-01-16 21:07:52 +00:00
parent 2c40c9a6c0
commit dbdd830886
2 changed files with 11 additions and 1 deletions
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4
lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
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@ -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;
}

8
test/Transforms/InstCombine/fdiv.ll
View File

@ -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
}