third_party/llvm-7.0/llvm/test/Transforms/Reassociate/fast-MissedTree.ll

; RUN: opt < %s -reassociate -instcombine -S | FileCheck %s

define float @test1(float %A, float %B) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:    [[Z:%.*]] = fadd fast float %A, %B
; CHECK-NEXT:    ret float [[Z]]
;
  %W = fadd fast float %B, -5.0
  %Y = fadd fast float %A, 5.0
  %Z = fadd fast float %W, %Y
  ret float %Z
}

; Check again using minimal subset of FMF.
; Both 'reassoc' and 'nsz' are required.
define float @test1_reassoc_nsz(float %A, float %B) {
; CHECK-LABEL: @test1_reassoc_nsz(
; CHECK-NEXT:    [[Z:%.*]] = fadd reassoc nsz float %A, %B
; CHECK-NEXT:    ret float [[Z]]
;
  %W = fadd reassoc nsz float %B, -5.0
  %Y = fadd reassoc nsz float %A, 5.0
  %Z = fadd reassoc nsz float %W, %Y
  ret float %Z
}

; Verify the fold is not done with only 'reassoc' ('nsz' is required).
define float @test1_reassoc(float %A, float %B) {
; CHECK-LABEL: @test1_reassoc(
; CHECK-NEXT:    [[W:%.*]] = fadd reassoc float %B, -5.000000e+00
; CHECK-NEXT:    [[Y:%.*]] = fadd reassoc float %A, 5.000000e+00
; CHECK-NEXT:    [[Z:%.*]] = fadd reassoc float [[Y]], [[W]]
; CHECK-NEXT:    ret float [[Z]]
;
  %W = fadd reassoc float %B, -5.0
  %Y = fadd reassoc float %A, 5.0
  %Z = fadd reassoc float %W, %Y
  ret float %Z
}