TheRock/compiler/amd-llvm/llvm/test/Transforms/Reassociate/reassoc-intermediate-fnegs.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=reassociate -S | FileCheck %s

; B * 5 + A * -5
; TODO: (B - A) * 5

define half @faddsubAssoc1(half %a, half %b) {
; CHECK-LABEL: @faddsubAssoc1(
; CHECK-NEXT:    [[T2_NEG:%.*]] = fmul fast half [[A:%.*]], -5.000000e+00
; CHECK-NEXT:    [[REASS_MUL:%.*]] = fmul fast half [[B:%.*]], 5.000000e+00
; CHECK-NEXT:    [[T5:%.*]] = fadd fast half [[REASS_MUL]], [[T2_NEG]]
; CHECK-NEXT:    ret half [[T5]]
;
  %t1 = fmul fast half %b, 0xH4200 ; 3*b
  %t2 = fmul fast half %a, 0xH4500 ; 5*a
  %t3 = fmul fast half %b, 0xH4000 ; 2*b
  %t4 = fsub fast half %t2, %t1 ; 5 * a - 3 * b
  %t5 = fsub fast half %t3, %t4 ; 2 * b - ( 5 * a - 3 * b)
  ret half %t5 ; = 5 * (b - a)
}

; B + A * 5

define half @faddsubAssoc2(half %a, half %b) {
; CHECK-LABEL: @faddsubAssoc2(
; CHECK-NEXT:    [[T2:%.*]] = fmul fast half [[A:%.*]], 5.000000e+00
; CHECK-NEXT:    [[T5:%.*]] = fadd fast half [[B:%.*]], [[T2]]
; CHECK-NEXT:    ret half [[T5]]
;
  %t1 = fmul fast half %b, 0xH4200 ; 3*b
  %t2 = fmul fast half %a, 0xH4500 ; 5*a
  %t3 = fmul fast half %b, 0xH4000 ; 2*b
  %t4 = fadd fast half %t2, %t1 ; 5 * a + 3 * b
  %t5 = fsub fast half %t4, %t3 ; (5 * a + 3 * b) - (2 * b)
  ret half %t5 ; = 5 * a + b
}