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[InstCombine] simplify code for X * -1.0 --> -X; NFC

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I've added random FMF to one of the tests to show those are propagated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@326377 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjay Patel
2018-02-28 22:30:04 +00:00
parent ad4af60b67
commit 3190427825
2 changed files with 5 additions and 9 deletions
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lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
+3 -7
View File
@@ -563,13 +563,9 @@ Instruction *InstCombiner::visitFMul(BinaryOperator &I) {
if (match(Op0, m_FNeg(m_Value(X))))
return BinaryOperator::CreateFMulFMF(X, ConstantExpr::getFNeg(C), &I);
// (fmul X, -1.0) --> (fsub -0.0, X)
if (match(C, m_SpecificFP(-1.0))) {
Constant *NegZero = ConstantFP::getNegativeZero(Op1->getType());
Instruction *RI = BinaryOperator::CreateFSub(NegZero, Op0);
RI->copyFastMathFlags(&I);
return RI;
}
// X * -1.0 --> -X
if (match(C, m_SpecificFP(-1.0)))
return BinaryOperator::CreateFNegFMF(Op0, &I);
if (AllowReassociate && C->isFiniteNonZeroFP()) {
// Let MDC denote an expression in one of these forms:
test/Transforms/InstCombine/fmul.ll
+2 -2
View File
@@ -153,10 +153,10 @@ define float @test9(float %x) {
; PR18532
define <4 x float> @test10(<4 x float> %x) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: [[MUL:%.*]] = fsub <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, [[X:%.*]]
; CHECK-NEXT: [[MUL:%.*]] = fsub arcp afn <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, [[X:%.*]]
; CHECK-NEXT: ret <4 x float> [[MUL]]
;
%mul = fmul <4 x float> %x, <float -1.0, float -1.0, float -1.0, float -1.0>
%mul = fmul arcp afn <4 x float> %x, <float -1.0, float -1.0, float -1.0, float -1.0>
ret <4 x float> %mul
}