70 lines
1.9 KiB
LLVM
70 lines
1.9 KiB
LLVM
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; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7-avx | FileCheck %s
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; rdar://13126763
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; Expression "x + x*x" was mistakenly transformed into "x * 3.0f".
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define float @test1(float %x) {
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; CHECK-LABEL: test1:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: vmulss %xmm0, %xmm0, %xmm1
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; CHECK-NEXT: vaddss %xmm0, %xmm1, %xmm0
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; CHECK-NEXT: retq
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%t1 = fmul fast float %x, %x
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%t2 = fadd fast float %t1, %x
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ret float %t2
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}
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; (x + x) + x => x * 3.0
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define float @test2(float %x) {
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; CHECK-LABEL: test2:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: vmulss {{.*}}(%rip), %xmm0, %xmm0
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; CHECK-NEXT: retq
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%t1 = fadd fast float %x, %x
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%t2 = fadd fast float %t1, %x
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ret float %t2
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}
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; x + (x + x) => x * 3.0
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define float @test3(float %x) {
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; CHECK-LABEL: test3:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: vmulss {{.*}}(%rip), %xmm0, %xmm0
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; CHECK-NEXT: retq
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%t1 = fadd fast float %x, %x
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%t2 = fadd fast float %x, %t1
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ret float %t2
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}
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; (y + x) + x != x * 3.0
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define float @test4(float %x, float %y) {
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; CHECK-LABEL: test4:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: vaddss %xmm1, %xmm0, %xmm1
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; CHECK-NEXT: vaddss %xmm0, %xmm1, %xmm0
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; CHECK-NEXT: retq
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%t1 = fadd fast float %x, %y
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%t2 = fadd fast float %t1, %x
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ret float %t2
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}
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; rdar://13445387
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; "x + x + x => 3.0 * x" should be disabled after legalization because
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; Instruction-Selection doesn't know how to handle "3.0"
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;
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define float @test5(<4 x float> %x) {
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; CHECK-LABEL: test5:
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; CHECK: ## %bb.0:
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; CHECK-NEXT: vmulss {{.*}}(%rip), %xmm0, %xmm0
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; CHECK-NEXT: retq
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%splat = shufflevector <4 x float> %x, <4 x float> undef, <4 x i32> zeroinitializer
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%v1 = extractelement <4 x float> %splat, i32 1
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%v0 = extractelement <4 x float> %splat, i32 0
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%add1 = fadd reassoc nsz float %v0, %v1
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%v2 = extractelement <4 x float> %splat, i32 2
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%add2 = fadd reassoc nsz float %v2, %add1
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ret float %add2
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}
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