forked from OSchip/llvm-project
43 lines
963 B
LLVM
43 lines
963 B
LLVM
; 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
|
|
}
|