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4d5ef8fb85
We sometimes create intermediate subtract instructions during reassociation. Adding these to the worklist to revisit exposes many additional reassociation opportunities. Patch by Aditya Nandakumar. llvm-svn: 253240
33 lines
1022 B
LLVM
33 lines
1022 B
LLVM
; RUN: opt < %s -reassociate -S | FileCheck %s
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define float @fmultistep1(float %a, float %b, float %c) {
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; Check that a*a*b+a*a*c is turned into a*(a*(b+c)).
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; CHECK-LABEL: @fmultistep1
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; CHECK-NEXT: [[TMP1:%tmp.*]] = fadd fast float %c, %b
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; CHECK-NEXT: [[TMP2:%tmp.*]] = fmul fast float %a, %a
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; CHECK-NEXT: fmul fast float [[TMP2]], [[TMP1]]
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; CHECK-NEXT: ret float
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%t0 = fmul fast float %a, %b
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%t1 = fmul fast float %a, %t0 ; a*(a*b)
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%t2 = fmul fast float %a, %c
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%t3 = fmul fast float %a, %t2 ; a*(a*c)
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%t4 = fadd fast float %t1, %t3
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ret float %t4
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}
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define float @fmultistep2(float %a, float %b, float %c, float %d) {
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; Check that a*b+a*c+d is turned into a*(b+c)+d.
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; CHECK-LABEL: @fmultistep2
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; CHECK-NEXT: fadd fast float %c, %b
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; CHECK-NEXT: fmul fast float %tmp, %a
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; CHECK-NEXT: fadd fast float %tmp1, %d
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; CHECK-NEXT: ret float
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%t0 = fmul fast float %a, %b
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%t1 = fmul fast float %a, %c
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%t2 = fadd fast float %t1, %d ; a*c+d
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%t3 = fadd fast float %t0, %t2 ; a*b+(a*c+d)
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ret float %t3
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}
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