1 ; RUN: llc < %s -enable-unsafe-fp-math -mtriple=x86_64-apple-darwin -mcpu=corei7-avx | FileCheck %s 2 3 4 ; rdar://13126763 5 ; Expression "x + x*x" was mistakenly transformed into "x * 3.0f". 6 7 define float @test1(float %x) { 8 %t1 = fmul fast float %x, %x 9 %t2 = fadd fast float %t1, %x 10 ret float %t2 11 ; CHECK: test1 12 ; CHECK: vaddss 13 } 14 15 ; (x + x) + x => x * 3.0 16 define float @test2(float %x) { 17 %t1 = fadd fast float %x, %x 18 %t2 = fadd fast float %t1, %x 19 ret float %t2 20 ; CHECK: .long 1077936128 21 ; CHECK: test2 22 ; CHECK: vmulss LCPI1_0(%rip), %xmm0, %xmm0 23 } 24 25 ; x + (x + x) => x * 3.0 26 define float @test3(float %x) { 27 %t1 = fadd fast float %x, %x 28 %t2 = fadd fast float %t1, %x 29 ret float %t2 30 ; CHECK: .long 1077936128 31 ; CHECK: test3 32 ; CHECK: vmulss LCPI2_0(%rip), %xmm0, %xmm0 33 } 34 35 ; (y + x) + x != x * 3.0 36 define float @test4(float %x, float %y) { 37 %t1 = fadd fast float %x, %y 38 %t2 = fadd fast float %t1, %x 39 ret float %t2 40 ; CHECK: test4 41 ; CHECK: vaddss 42 } 43 44 ; rdar://13445387 45 ; "x + x + x => 3.0 * x" should be disabled after legalization because 46 ; Instruction-Selection doesn't know how to handle "3.0" 47 ; 48 define float @test5() { 49 %mul.i.i151 = fmul <4 x float> zeroinitializer, zeroinitializer 50 %vecext.i8.i152 = extractelement <4 x float> %mul.i.i151, i32 1 51 %vecext1.i9.i153 = extractelement <4 x float> %mul.i.i151, i32 0 52 %add.i10.i154 = fadd float %vecext1.i9.i153, %vecext.i8.i152 53 %vecext.i7.i155 = extractelement <4 x float> %mul.i.i151, i32 2 54 %add.i.i156 = fadd float %vecext.i7.i155, %add.i10.i154 55 ret float %add.i.i156 56 } 57
