test/CodeGen/X86/dagcombine_unsafe_math.ll

; RUN: llc < %s -enable-unsafe-fp-math -mtriple=x86_64-apple-darwin -mcpu=corei7-avx | FileCheck %s 


; rdar://13126763
; Expression "x + x*x" was mistakenly transformed into "x * 3.0f".

define float @test1(float %x) {
  %t1 = fmul fast float %x, %x
  %t2 = fadd fast float %t1, %x
  ret float %t2
; CHECK: test1
; CHECK: vaddss
}

; (x + x) + x => x * 3.0
define float @test2(float %x) {
  %t1 = fadd fast float %x, %x
  %t2 = fadd fast float %t1, %x
  ret float %t2
; CHECK: .long  1077936128
; CHECK: test2
; CHECK: vmulss LCPI1_0(%rip), %xmm0, %xmm0
}

; x + (x + x) => x * 3.0
define float @test3(float %x) {
  %t1 = fadd fast float %x, %x
  %t2 = fadd fast float %t1, %x
  ret float %t2
; CHECK: .long  1077936128
; CHECK: test3
; CHECK: vmulss LCPI2_0(%rip), %xmm0, %xmm0
}

; (y + x) + x != x * 3.0
define float @test4(float %x, float %y) {
  %t1 = fadd fast float %x, %y
  %t2 = fadd fast float %t1, %x
  ret float %t2
; CHECK: test4
; CHECK: vaddss
}