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Revert rGcd938ab162b0ac560dd0e9fee290980c7e0e47e5 "[X86] canonicalizeShuffleWithBinOps - add X86ISD::PSHUFB handling." 

Investigating an issue reported by @bkramer, possibly when the PSHUFB mask generates zero elements.
This commit is contained in:
Simon Pilgrim 2021-03-11 13:02:14 +00:00
parent 1fd4beecc8
commit bc5e9ec2dc
4 changed files with 3 additions and 4 deletions
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1
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -36839,7 +36839,6 @@ static SDValue canonicalizeShuffleWithBinOps(SDValue N, SelectionDAG &DAG,
// Unary and Unary+Permute Shuffles.
case X86ISD::VBROADCAST:
case X86ISD::MOVDDUP:
case X86ISD::PSHUFB:
case X86ISD::PSHUFD: {
if (N.getOperand(0).getValueType() == ShuffleVT &&
N->isOnlyUserOf(N.getOperand(0).getNode())) {

2
llvm/test/CodeGen/X86/vector-fshr-rot-128.ll
View File

@ -1403,8 +1403,8 @@ define <16 x i8> @splatvar_funnnel_v16i8(<16 x i8> %x, <16 x i8> %amt) nounwind
; XOPAVX1-LABEL: splatvar_funnnel_v16i8:
; XOPAVX1: # %bb.0:
; XOPAVX1-NEXT: vpxor %xmm2, %xmm2, %xmm2
; XOPAVX1-NEXT: vpshufb %xmm2, %xmm1, %xmm1
; XOPAVX1-NEXT: vpsubb %xmm1, %xmm2, %xmm1
; XOPAVX1-NEXT: vpshufb %xmm2, %xmm1, %xmm1
; XOPAVX1-NEXT: vprotb %xmm1, %xmm0, %xmm0
; XOPAVX1-NEXT: retq
;

2
llvm/test/CodeGen/X86/vector-shift-ashr-128.ll
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@ -848,8 +848,8 @@ define <16 x i8> @splatvar_shift_v16i8(<16 x i8> %a, <16 x i8> %b) nounwind {
; XOPAVX1-LABEL: splatvar_shift_v16i8:
; XOPAVX1: # %bb.0:
; XOPAVX1-NEXT: vpxor %xmm2, %xmm2, %xmm2
; XOPAVX1-NEXT: vpshufb %xmm2, %xmm1, %xmm1
; XOPAVX1-NEXT: vpsubb %xmm1, %xmm2, %xmm1
; XOPAVX1-NEXT: vpshufb %xmm2, %xmm1, %xmm1
; XOPAVX1-NEXT: vpshab %xmm1, %xmm0, %xmm0
; XOPAVX1-NEXT: retq
;

2
llvm/test/CodeGen/X86/vector-shift-lshr-128.ll
View File

@ -698,8 +698,8 @@ define <16 x i8> @splatvar_shift_v16i8(<16 x i8> %a, <16 x i8> %b) nounwind {
; XOPAVX1-LABEL: splatvar_shift_v16i8:
; XOPAVX1: # %bb.0:
; XOPAVX1-NEXT: vpxor %xmm2, %xmm2, %xmm2
; XOPAVX1-NEXT: vpshufb %xmm2, %xmm1, %xmm1
; XOPAVX1-NEXT: vpsubb %xmm1, %xmm2, %xmm1
; XOPAVX1-NEXT: vpshufb %xmm2, %xmm1, %xmm1
; XOPAVX1-NEXT: vpshlb %xmm1, %xmm0, %xmm0
; XOPAVX1-NEXT: retq
;