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af2e8dd42f
Fix a bug in DAGCombine. The symptom is mistakenly optimizing expression "x + x*x" into "x * 3.0". llvm-svn: 174239
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
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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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%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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; CHECK: test1
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; CHECK: vaddss
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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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%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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; CHECK: .long 1077936128
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; CHECK: test2
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; CHECK: vmulss LCPI1_0(%rip), %xmm0, %xmm0
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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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%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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; CHECK: .long 1077936128
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; CHECK: test3
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; CHECK: vmulss LCPI2_0(%rip), %xmm0, %xmm0
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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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%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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; CHECK: test4
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; CHECK: vaddss
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}
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