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[X86] getFauxShuffle - don't assume an UNDEF src element for AND/ANDNP results in an UNDEF shuffle mask index 

The other src element might be zero, guaranteeing zero.

Fixes #55157
This commit is contained in:
Simon Pilgrim 2022-04-28 11:54:18 +01:00
parent cfb4e78252
commit 8680dd5117
1 changed files with 10 additions and 4 deletions
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14
llvm/test/CodeGen/X86/vector-shuffle-combining.ll
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@ -3333,11 +3333,17 @@ define void @PR45604(<32 x i16>* %dst, <8 x i16>* %src) {
ret void
}
; FIXME: getFauxShuffle AND/ANDN decoding wrongly assumes an undef src always gives an undef dst.
; getFauxShuffle AND/ANDN decoding wrongly assumed an undef src always gives an undef dst.
define <2 x i64> @PR55157(<16 x i8>* %0) {
; CHECK-LABEL: PR55157:
; CHECK: # %bb.0:
; CHECK-NEXT: retq
; SSE-LABEL: PR55157:
; SSE: # %bb.0:
; SSE-NEXT: xorps %xmm0, %xmm0
; SSE-NEXT: retq
;
; AVX-LABEL: PR55157:
; AVX: # %bb.0:
; AVX-NEXT: vxorps %xmm0, %xmm0, %xmm0
; AVX-NEXT: retq
%2 = load <16 x i8>, <16 x i8>* %0, align 16
%3 = icmp eq <16 x i8> %2, zeroinitializer
%4 = tail call <16 x i8> @llvm.x86.sse2.pavg.b(<16 x i8> zeroinitializer, <16 x i8> zeroinitializer)