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[X86][AVX] Split VZEXT_MOVL ymm/zmm if the upper elements are not demanded. 

Removes unnecessary vzeroupper noted in D61806

llvm-svn: 360543
This commit is contained in:
Simon Pilgrim 2019-05-12 15:16:29 +00:00
parent 2de619099a
commit a7fc763082
3 changed files with 12 additions and 3 deletions
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12
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -33593,6 +33593,18 @@ bool X86TargetLowering::SimplifyDemandedVectorEltsForTargetNode(
ExtSizeInBits = SizeInBits / 4;
switch (Opc) {
// Zero upper elements.
case X86ISD::VZEXT_MOVL: {
SDLoc DL(Op);
SDValue Ext0 =
extractSubVector(Op.getOperand(0), 0, TLO.DAG, DL, ExtSizeInBits);
SDValue ExtOp =
TLO.DAG.getNode(Opc, DL, Ext0.getValueType(), Ext0);
SDValue UndefVec = TLO.DAG.getUNDEF(VT);
SDValue Insert =
insertSubVector(UndefVec, ExtOp, 0, TLO.DAG, DL, ExtSizeInBits);
return TLO.CombineTo(Op, Insert);
}
// Byte shifts by immediate.
case X86ISD::VSHLDQ:
case X86ISD::VSRLDQ:

2
llvm/test/CodeGen/X86/insertelement-zero.ll
View File

@ -586,8 +586,6 @@ define <8 x float> @PR41512_v8f32(float %x, float %y) {
;
; AVX-LABEL: PR41512_v8f32:
; AVX: # %bb.0:
; AVX-NEXT: # kill: def $xmm1 killed $xmm1 def $ymm1
; AVX-NEXT: # kill: def $xmm0 killed $xmm0 def $ymm0
; AVX-NEXT: vxorps %xmm2, %xmm2, %xmm2
; AVX-NEXT: vblendps {{.*#+}} xmm0 = xmm0[0],xmm2[1,2,3]
; AVX-NEXT: vblendps {{.*#+}} xmm1 = xmm1[0],xmm2[1,2,3]

1
llvm/test/CodeGen/X86/sad.ll
View File

@ -1449,7 +1449,6 @@ define i32 @sad_unroll_nonzero_initial(<16 x i8>* %arg, <16 x i8>* %arg1, <16 x
; AVX2-NEXT: vpshufd {{.*#+}} xmm1 = xmm0[1,1,2,3]
; AVX2-NEXT: vpaddd %xmm1, %xmm0, %xmm0
; AVX2-NEXT: vmovd %xmm0, %eax
; AVX2-NEXT: vzeroupper
; AVX2-NEXT: retq
;
; AVX512-LABEL: sad_unroll_nonzero_initial: