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[Reassoc] Small fix to support unary FNeg in NegateValue(...)

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Differential Revision: https://reviews.llvm.org/D66612

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369772 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron McInally 2019-08-23 15:49:38 +00:00
parent 44404116d0
commit 22aae05caa
2 changed files with 25 additions and 1 deletions
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2
lib/Transforms/Scalar/Reassociate.cpp
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@ -861,7 +861,7 @@ static Value *NegateValue(Value *V, Instruction *BI,
// this use. We do this by moving it to the entry block (if it is a
// non-instruction value) or right after the definition. These negates will
// be zapped by reassociate later, so we don't need much finesse here.
BinaryOperator *TheNeg = cast<BinaryOperator>(U);
Instruction *TheNeg = cast<Instruction>(U);
// Verify that the negate is in this function, V might be a constant expr.
if (TheNeg->getParent()->getParent() != BI->getParent()->getParent())

24
test/Transforms/Reassociate/2019-08-22-FNegAssert.ll Normal file
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@ -0,0 +1,24 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -reassociate -S | FileCheck %s
; D61675
define float @test1(float %arg, float %arg1, float %arg2, float %arg3) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: [[TMP5:%.*]] = fneg fast float [[ARG:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = fsub fast float [[ARG3:%.*]], [[ARG2:%.*]]
; CHECK-NEXT: [[TMP2_NEG:%.*]] = fadd fast float [[TMP5]], 5.000000e+02
; CHECK-NEXT: [[TMP3:%.*]] = fadd fast float [[TMP2_NEG]], [[TMP1]]
; CHECK-NEXT: [[TMP4:%.*]] = fmul fast float [[TMP3]], [[TMP3]]
; CHECK-NEXT: [[TMP6:%.*]] = fdiv fast float [[TMP5]], [[ARG1:%.*]]
; CHECK-NEXT: [[TMP7:%.*]] = fadd fast float [[TMP4]], [[TMP6]]
; CHECK-NEXT: ret float [[TMP7]]
;
%tmp1 = fsub fast float %arg3, %arg2
%tmp2 = fadd fast float %arg, -5.000000e+02
%tmp3 = fsub fast float %tmp1, %tmp2
%tmp4 = fmul fast float %tmp3, %tmp3
%tmp5 = fneg fast float %arg
%tmp6 = fdiv fast float %tmp5, %arg1
%tmp7 = fadd fast float %tmp6, %tmp4
ret float %tmp7
}