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[X86] Fixes bug in build_vector v4x32 lowering

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r222375 made some improvements to build_vector lowering of v4x32 and v4xf32 into an insertps, but it missed a case where:

1. A single extracted element is used twice.
2. The lower of the two non-zero indexes should be preserved, and the higher should be used for the dest mask.

This caused a crash, since the source value for the insertps ends-up uninitialized.

Differential Revision: http://reviews.llvm.org/D6377

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222635 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Kuperstein
2014-11-23 13:09:06 +00:00
parent 71777d18ad
commit d539147834
2 changed files with 23 additions and 3 deletions
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17
test/CodeGen/X86/sse41.ll
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@@ -1145,6 +1145,23 @@ entry:
ret <4 x float> %vecinit3
}
define <4 x float> @insertps_10(<4 x float> %A)
{
; X32-LABEL: insertps_10:
; X32: ## BB#0:
; X32-NEXT: insertps {{.*#+}} xmm0 = xmm0[0],zero,xmm0[0],zero
; X32-NEXT: retl
;
; X64-LABEL: insertps_10:
; X64: ## BB#0:
; X64-NEXT: insertps {{.*#+}} xmm0 = xmm0[0],zero,xmm0[0],zero
; X64-NEXT: retq
%vecext = extractelement <4 x float> %A, i32 0
%vecbuild1 = insertelement <4 x float> <float 0.000000e+00, float 0.000000e+00, float 0.000000e+00, float 0.000000e+00>, float %vecext, i32 0
%vecbuild2 = insertelement <4 x float> %vecbuild1, float %vecext, i32 2
ret <4 x float> %vecbuild2
}
define <4 x float> @build_vector_to_shuffle_1(<4 x float> %A) {
; X32-LABEL: build_vector_to_shuffle_1:
; X32: ## BB#0: