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c3b630d64b
when the top elements of a vector are undefined. This happens all
the time for X86-64 ABI stuff because only the low 2 elements of
a 4 element vector are defined. For example, on:
_Complex float f32(_Complex float A, _Complex float B) {
return A+B;
}
We used to produce (with SSE2, SSE4.1+ uses insertps):
_f32: ## @f32
movdqa %xmm0, %xmm2
addss %xmm1, %xmm2
pshufd $16, %xmm2, %xmm2
pshufd $1, %xmm1, %xmm1
pshufd $1, %xmm0, %xmm0
addss %xmm1, %xmm0
pshufd $16, %xmm0, %xmm1
movdqa %xmm2, %xmm0
unpcklps %xmm1, %xmm0
ret
We now produce:
_f32: ## @f32
movdqa %xmm0, %xmm2
addss %xmm1, %xmm2
pshufd $1, %xmm1, %xmm1
pshufd $1, %xmm0, %xmm3
addss %xmm1, %xmm3
movaps %xmm2, %xmm0
unpcklps %xmm3, %xmm0
ret
This implements rdar://8368414
llvm-svn: 112378
46 lines
1.4 KiB
LLVM
46 lines
1.4 KiB
LLVM
; Tests for SSE1 and below, without SSE2+.
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; RUN: llc < %s -march=x86 -mcpu=pentium3 -O3 | FileCheck %s
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; RUN: llc < %s -march=x86-64 -mcpu=pentium3 -O3 | FileCheck %s
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define <8 x i16> @test1(<8 x i32> %a) nounwind {
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; CHECK: test1
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ret <8 x i16> zeroinitializer
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}
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define <8 x i16> @test2(<8 x i32> %a) nounwind {
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; CHECK: test2
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%c = trunc <8 x i32> %a to <8 x i16> ; <<8 x i16>> [#uses=1]
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ret <8 x i16> %c
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}
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; PR7993
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;define <4 x i32> @test3(<4 x i16> %a) nounwind {
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; %c = sext <4 x i16> %a to <4 x i32> ; <<4 x i32>> [#uses=1]
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; ret <4 x i32> %c
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;}
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; This should not emit shuffles to populate the top 2 elements of the 4-element
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; vector that this ends up returning.
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; rdar://8368414
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define <2 x float> @test4(<2 x float> %A, <2 x float> %B) nounwind {
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entry:
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%tmp7 = extractelement <2 x float> %A, i32 0
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%tmp5 = extractelement <2 x float> %A, i32 1
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%tmp3 = extractelement <2 x float> %B, i32 0
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%tmp1 = extractelement <2 x float> %B, i32 1
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%add.r = fadd float %tmp7, %tmp3
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%add.i = fsub float %tmp5, %tmp1
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%tmp11 = insertelement <2 x float> undef, float %add.r, i32 0
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%tmp9 = insertelement <2 x float> %tmp11, float %add.i, i32 1
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ret <2 x float> %tmp9
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; CHECK: test4:
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; CHECK-NOT: shufps $16
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; CHECK: shufps $1,
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; CHECK-NOT: shufps $16
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; CHECK: shufps $1,
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; CHECK-NOT: shufps $16
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; CHECK: unpcklps
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; CHECK-NOT: shufps $16
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; CHECK: ret
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}
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