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