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1cd1d02141
For instance, following transformation will be disabled:
x + x + x => 3.0f * x;
The problem of these transformations is that it introduces a FP constant, which
following Instruction-Selection pass cannot handle.
Reviewed by Nadav, thanks a lot!
rdar://13445387
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177933 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
1.5 KiB
LLVM
57 lines
1.5 KiB
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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; rdar://13445387
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; "x + x + x => 3.0 * x" should be disabled after legalization because
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; Instruction-Selection dosen't know how to handle "3.0"
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;
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define float @test5() {
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%mul.i.i151 = fmul <4 x float> zeroinitializer, zeroinitializer
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%vecext.i8.i152 = extractelement <4 x float> %mul.i.i151, i32 1
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%vecext1.i9.i153 = extractelement <4 x float> %mul.i.i151, i32 0
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%add.i10.i154 = fadd float %vecext1.i9.i153, %vecext.i8.i152
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%vecext.i7.i155 = extractelement <4 x float> %mul.i.i151, i32 2
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%add.i.i156 = fadd float %vecext.i7.i155, %add.i10.i154
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ret float %add.i.i156
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}
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