1 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2 ; RUN: llc < %s -enable-unsafe-fp-math -mtriple=x86_64-apple-darwin -mcpu=corei7-avx | FileCheck %s 3 4 5 ; rdar://13126763 6 ; Expression "x + x*x" was mistakenly transformed into "x * 3.0f". 7 8 define float @test1(float %x) { 9 ; CHECK-LABEL: test1: 10 ; CHECK: ## %bb.0: 11 ; CHECK-NEXT: vmulss %xmm0, %xmm0, %xmm1 12 ; CHECK-NEXT: vaddss %xmm0, %xmm1, %xmm0 13 ; CHECK-NEXT: retq 14 %t1 = fmul fast float %x, %x 15 %t2 = fadd fast float %t1, %x 16 ret float %t2 17 } 18 19 ; (x + x) + x => x * 3.0 20 define float @test2(float %x) { 21 ; CHECK-LABEL: test2: 22 ; CHECK: ## %bb.0: 23 ; CHECK-NEXT: vmulss {{.*}}(%rip), %xmm0, %xmm0 24 ; CHECK-NEXT: retq 25 %t1 = fadd fast float %x, %x 26 %t2 = fadd fast float %t1, %x 27 ret float %t2 28 } 29 30 ; x + (x + x) => x * 3.0 31 define float @test3(float %x) { 32 ; CHECK-LABEL: test3: 33 ; CHECK: ## %bb.0: 34 ; CHECK-NEXT: vmulss {{.*}}(%rip), %xmm0, %xmm0 35 ; CHECK-NEXT: retq 36 %t1 = fadd fast float %x, %x 37 %t2 = fadd fast float %x, %t1 38 ret float %t2 39 } 40 41 ; (y + x) + x != x * 3.0 42 define float @test4(float %x, float %y) { 43 ; CHECK-LABEL: test4: 44 ; CHECK: ## %bb.0: 45 ; CHECK-NEXT: vaddss %xmm1, %xmm0, %xmm1 46 ; CHECK-NEXT: vaddss %xmm0, %xmm1, %xmm0 47 ; CHECK-NEXT: retq 48 %t1 = fadd fast float %x, %y 49 %t2 = fadd fast float %t1, %x 50 ret float %t2 51 } 52 53 ; rdar://13445387 54 ; "x + x + x => 3.0 * x" should be disabled after legalization because 55 ; Instruction-Selection doesn't know how to handle "3.0" 56 ; 57 define float @test5(<4 x float> %x) { 58 ; CHECK-LABEL: test5: 59 ; CHECK: ## %bb.0: 60 ; CHECK-NEXT: vmulss {{.*}}(%rip), %xmm0, %xmm0 61 ; CHECK-NEXT: retq 62 %splat = shufflevector <4 x float> %x, <4 x float> undef, <4 x i32> zeroinitializer 63 %v1 = extractelement <4 x float> %splat, i32 1 64 %v0 = extractelement <4 x float> %splat, i32 0 65 %add1 = fadd float %v0, %v1 66 %v2 = extractelement <4 x float> %splat, i32 2 67 %add2 = fadd float %v2, %add1 68 ret float %add2 69 } 70 71
