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[X86] Shrink zero extends of gather indices from type less than i32 to types larger than i32.
Gather instructions can use i32 or i64 elements for indices. If the index is zero extended from a type smaller than i32 to i64, we can shrink the extend to just extend to i32. llvm-svn: 373982
This commit is contained in:
Craig Topper
parent
5147f56dee
commit
bd251115d2
@ -42572,16 +42572,17 @@ static SDValue combineGatherScatter(SDNode *N, SelectionDAG &DAG,
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SDValue Base = GorS->getBasePtr();
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SDValue Scale = GorS->getScale();
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// Shrink constant indices if they are larger than 32-bits.
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// Only do this before legalize types since v2i64 could become v2i32.
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// FIXME: We could check that the type is legal if we're after legalize types,
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// but then we would need to construct test cases where that happens.
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// FIXME: We could support more than just constant vectors, but we need to
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// careful with costing. A truncate that can be optimized out would be fine.
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// Otherwise we might only want to create a truncate if it avoids a split.
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if (DCI.isBeforeLegalize()) {
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unsigned IndexWidth = Index.getScalarValueSizeInBits();
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// Shrink constant indices if they are larger than 32-bits.
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// Only do this before legalize types since v2i64 could become v2i32.
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// FIXME: We could check that the type is legal if we're after legalize
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// types, but then we would need to construct test cases where that happens.
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// FIXME: We could support more than just constant vectors, but we need to
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// careful with costing. A truncate that can be optimized out would be fine.
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// Otherwise we might only want to create a truncate if it avoids a split.
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if (auto *BV = dyn_cast<BuildVectorSDNode>(Index)) {
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unsigned IndexWidth = Index.getScalarValueSizeInBits();
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if (BV->isConstant() && IndexWidth > 32 &&
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DAG.ComputeNumSignBits(Index) > (IndexWidth - 32)) {
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unsigned NumElts = Index.getValueType().getVectorNumElements();
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@ -42604,37 +42605,42 @@ static SDValue combineGatherScatter(SDNode *N, SelectionDAG &DAG,
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Scatter->getIndexType());
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}
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}
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// Shrink any sign/zero extends from 32 or smaller to larger than 32 if
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// there are sufficient sign bits. Only do this before legalize types to
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// avoid creating illegal types in truncate.
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if ((Index.getOpcode() == ISD::SIGN_EXTEND ||
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Index.getOpcode() == ISD::ZERO_EXTEND) &&
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IndexWidth > 32 &&
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Index.getOperand(0).getScalarValueSizeInBits() <= 32 &&
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DAG.ComputeNumSignBits(Index) > (IndexWidth - 32)) {
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unsigned NumElts = Index.getValueType().getVectorNumElements();
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EVT NewVT = EVT::getVectorVT(*DAG.getContext(), MVT::i32, NumElts);
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Index = DAG.getNode(ISD::TRUNCATE, DL, NewVT, Index);
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if (auto *Gather = dyn_cast<MaskedGatherSDNode>(GorS)) {
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SDValue Ops[] = { Chain, Gather->getPassThru(),
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Mask, Base, Index, Scale } ;
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return DAG.getMaskedGather(Gather->getVTList(),
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Gather->getMemoryVT(), DL, Ops,
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Gather->getMemOperand(),
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Gather->getIndexType());
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}
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auto *Scatter = cast<MaskedScatterSDNode>(GorS);
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SDValue Ops[] = { Chain, Scatter->getValue(),
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Mask, Base, Index, Scale };
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return DAG.getMaskedScatter(Scatter->getVTList(),
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Scatter->getMemoryVT(), DL,
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Ops, Scatter->getMemOperand(),
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Scatter->getIndexType());
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}
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}
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if (DCI.isBeforeLegalizeOps()) {
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// Remove any sign extends from 32 or smaller to larger than 32.
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// Only do this before LegalizeOps in case we need the sign extend for
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// legalization.
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if (Index.getOpcode() == ISD::SIGN_EXTEND &&
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Index.getScalarValueSizeInBits() > 32 &&
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Index.getOperand(0).getScalarValueSizeInBits() <= 32) {
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Index = Index.getOperand(0);
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if (auto *Gather = dyn_cast<MaskedGatherSDNode>(GorS)) {
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SDValue Ops[] = { Chain, Gather->getPassThru(),
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Mask, Base, Index, Scale } ;
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return DAG.getMaskedGather(Gather->getVTList(),
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Gather->getMemoryVT(), DL, Ops,
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Gather->getMemOperand(),
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Gather->getIndexType());
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}
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auto *Scatter = cast<MaskedScatterSDNode>(GorS);
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SDValue Ops[] = { Chain, Scatter->getValue(),
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Mask, Base, Index, Scale };
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return DAG.getMaskedScatter(Scatter->getVTList(),
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Scatter->getMemoryVT(), DL,
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Ops, Scatter->getMemOperand(),
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Scatter->getIndexType());
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}
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unsigned IndexWidth = Index.getScalarValueSizeInBits();
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// Make sure the index is either i32 or i64
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unsigned ScalarSize = Index.getScalarValueSizeInBits();
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if (ScalarSize != 32 && ScalarSize != 64) {
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MVT EltVT = ScalarSize > 32 ? MVT::i64 : MVT::i32;
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if (IndexWidth != 32 && IndexWidth != 64) {
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MVT EltVT = IndexWidth > 32 ? MVT::i64 : MVT::i32;
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EVT IndexVT = EVT::getVectorVT(*DAG.getContext(), EltVT,
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Index.getValueType().getVectorNumElements());
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Index = DAG.getSExtOrTrunc(Index, DL, IndexVT);
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@ -42654,30 +42660,6 @@ static SDValue combineGatherScatter(SDNode *N, SelectionDAG &DAG,
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Ops, Scatter->getMemOperand(),
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Scatter->getIndexType());
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}
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// Try to remove zero extends from 32->64 if we know the sign bit of
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// the input is zero.
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if (Index.getOpcode() == ISD::ZERO_EXTEND &&
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Index.getScalarValueSizeInBits() == 64 &&
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Index.getOperand(0).getScalarValueSizeInBits() == 32 &&
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DAG.SignBitIsZero(Index.getOperand(0))) {
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Index = Index.getOperand(0);
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if (auto *Gather = dyn_cast<MaskedGatherSDNode>(GorS)) {
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SDValue Ops[] = { Chain, Gather->getPassThru(),
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Mask, Base, Index, Scale } ;
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return DAG.getMaskedGather(Gather->getVTList(),
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Gather->getMemoryVT(), DL, Ops,
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Gather->getMemOperand(),
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Gather->getIndexType());
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}
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auto *Scatter = cast<MaskedScatterSDNode>(GorS);
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SDValue Ops[] = { Chain, Scatter->getValue(),
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Mask, Base, Index, Scale };
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return DAG.getMaskedScatter(Scatter->getVTList(),
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Scatter->getMemoryVT(), DL,
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Ops, Scatter->getMemOperand(),
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Scatter->getIndexType());
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}
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}
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// With vector masks we only demand the upper bit of the mask.
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@ -2693,56 +2693,32 @@ declare <8 x float> @llvm.masked.gather.v8f32.v8p0f32(<8 x float*>, i32, <8 x i1
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define <16 x float> @zext_i8_index(float* %base, <16 x i8> %ind) {
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; KNL_64-LABEL: zext_i8_index:
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; KNL_64: # %bb.0:
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; KNL_64-NEXT: vpmovzxbw {{.*#+}} ymm0 = xmm0[0],zero,xmm0[1],zero,xmm0[2],zero,xmm0[3],zero,xmm0[4],zero,xmm0[5],zero,xmm0[6],zero,xmm0[7],zero,xmm0[8],zero,xmm0[9],zero,xmm0[10],zero,xmm0[11],zero,xmm0[12],zero,xmm0[13],zero,xmm0[14],zero,xmm0[15],zero
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; KNL_64-NEXT: vpmovzxwq {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; KNL_64-NEXT: vextracti128 $1, %ymm0, %xmm0
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; KNL_64-NEXT: vpmovzxwq {{.*#+}} zmm0 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; KNL_64-NEXT: vpmovzxbd {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero,xmm0[8],zero,zero,zero,xmm0[9],zero,zero,zero,xmm0[10],zero,zero,zero,xmm0[11],zero,zero,zero,xmm0[12],zero,zero,zero,xmm0[13],zero,zero,zero,xmm0[14],zero,zero,zero,xmm0[15],zero,zero,zero
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; KNL_64-NEXT: kxnorw %k0, %k0, %k1
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; KNL_64-NEXT: kxnorw %k0, %k0, %k2
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; KNL_64-NEXT: vgatherqps (%rdi,%zmm0,4), %ymm2 {%k2}
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; KNL_64-NEXT: vgatherqps (%rdi,%zmm1,4), %ymm0 {%k1}
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; KNL_64-NEXT: vinsertf64x4 $1, %ymm2, %zmm0, %zmm0
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; KNL_64-NEXT: vgatherdps (%rdi,%zmm1,4), %zmm0 {%k1}
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; KNL_64-NEXT: retq
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;
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; KNL_32-LABEL: zext_i8_index:
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; KNL_32: # %bb.0:
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; KNL_32-NEXT: movl {{[0-9]+}}(%esp), %eax
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; KNL_32-NEXT: vpmovzxbw {{.*#+}} ymm0 = xmm0[0],zero,xmm0[1],zero,xmm0[2],zero,xmm0[3],zero,xmm0[4],zero,xmm0[5],zero,xmm0[6],zero,xmm0[7],zero,xmm0[8],zero,xmm0[9],zero,xmm0[10],zero,xmm0[11],zero,xmm0[12],zero,xmm0[13],zero,xmm0[14],zero,xmm0[15],zero
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; KNL_32-NEXT: vpmovzxwq {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; KNL_32-NEXT: vextracti128 $1, %ymm0, %xmm0
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; KNL_32-NEXT: vpmovzxwq {{.*#+}} zmm0 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; KNL_32-NEXT: vpmovzxbd {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero,xmm0[8],zero,zero,zero,xmm0[9],zero,zero,zero,xmm0[10],zero,zero,zero,xmm0[11],zero,zero,zero,xmm0[12],zero,zero,zero,xmm0[13],zero,zero,zero,xmm0[14],zero,zero,zero,xmm0[15],zero,zero,zero
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; KNL_32-NEXT: kxnorw %k0, %k0, %k1
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; KNL_32-NEXT: kxnorw %k0, %k0, %k2
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; KNL_32-NEXT: vgatherqps (%eax,%zmm0,4), %ymm2 {%k2}
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; KNL_32-NEXT: vgatherqps (%eax,%zmm1,4), %ymm0 {%k1}
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; KNL_32-NEXT: vinsertf64x4 $1, %ymm2, %zmm0, %zmm0
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; KNL_32-NEXT: vgatherdps (%eax,%zmm1,4), %zmm0 {%k1}
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; KNL_32-NEXT: retl
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;
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; SKX-LABEL: zext_i8_index:
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; SKX: # %bb.0:
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; SKX-NEXT: vpmovzxbw {{.*#+}} ymm0 = xmm0[0],zero,xmm0[1],zero,xmm0[2],zero,xmm0[3],zero,xmm0[4],zero,xmm0[5],zero,xmm0[6],zero,xmm0[7],zero,xmm0[8],zero,xmm0[9],zero,xmm0[10],zero,xmm0[11],zero,xmm0[12],zero,xmm0[13],zero,xmm0[14],zero,xmm0[15],zero
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; SKX-NEXT: vpmovzxwq {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; SKX-NEXT: vextracti128 $1, %ymm0, %xmm0
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; SKX-NEXT: vpmovzxwq {{.*#+}} zmm0 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; SKX-NEXT: vpmovzxbd {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero,xmm0[8],zero,zero,zero,xmm0[9],zero,zero,zero,xmm0[10],zero,zero,zero,xmm0[11],zero,zero,zero,xmm0[12],zero,zero,zero,xmm0[13],zero,zero,zero,xmm0[14],zero,zero,zero,xmm0[15],zero,zero,zero
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; SKX-NEXT: kxnorw %k0, %k0, %k1
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; SKX-NEXT: kxnorw %k0, %k0, %k2
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; SKX-NEXT: vgatherqps (%rdi,%zmm0,4), %ymm2 {%k2}
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; SKX-NEXT: vgatherqps (%rdi,%zmm1,4), %ymm0 {%k1}
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; SKX-NEXT: vinsertf64x4 $1, %ymm2, %zmm0, %zmm0
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; SKX-NEXT: vgatherdps (%rdi,%zmm1,4), %zmm0 {%k1}
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; SKX-NEXT: retq
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;
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; SKX_32-LABEL: zext_i8_index:
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; SKX_32: # %bb.0:
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; SKX_32-NEXT: movl {{[0-9]+}}(%esp), %eax
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; SKX_32-NEXT: vpmovzxbw {{.*#+}} ymm0 = xmm0[0],zero,xmm0[1],zero,xmm0[2],zero,xmm0[3],zero,xmm0[4],zero,xmm0[5],zero,xmm0[6],zero,xmm0[7],zero,xmm0[8],zero,xmm0[9],zero,xmm0[10],zero,xmm0[11],zero,xmm0[12],zero,xmm0[13],zero,xmm0[14],zero,xmm0[15],zero
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; SKX_32-NEXT: vpmovzxwq {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; SKX_32-NEXT: vextracti128 $1, %ymm0, %xmm0
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; SKX_32-NEXT: vpmovzxwq {{.*#+}} zmm0 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; SKX_32-NEXT: vpmovzxbd {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero,xmm0[8],zero,zero,zero,xmm0[9],zero,zero,zero,xmm0[10],zero,zero,zero,xmm0[11],zero,zero,zero,xmm0[12],zero,zero,zero,xmm0[13],zero,zero,zero,xmm0[14],zero,zero,zero,xmm0[15],zero,zero,zero
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; SKX_32-NEXT: kxnorw %k0, %k0, %k1
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; SKX_32-NEXT: kxnorw %k0, %k0, %k2
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; SKX_32-NEXT: vgatherqps (%eax,%zmm0,4), %ymm2 {%k2}
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; SKX_32-NEXT: vgatherqps (%eax,%zmm1,4), %ymm0 {%k1}
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; SKX_32-NEXT: vinsertf64x4 $1, %ymm2, %zmm0, %zmm0
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; SKX_32-NEXT: vgatherdps (%eax,%zmm1,4), %zmm0 {%k1}
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; SKX_32-NEXT: retl
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%zext_ind = zext <16 x i8> %ind to <16 x i64>
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@ -2756,32 +2732,36 @@ define <16 x float> @zext_i8_index(float* %base, <16 x i8> %ind) {
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define <8 x float> @zext_v8i8_index(float* %base, <8 x i8> %ind) {
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; KNL_64-LABEL: zext_v8i8_index:
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; KNL_64: # %bb.0:
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; KNL_64-NEXT: vpmovzxbq {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,zero,zero,zero,zero,xmm0[1],zero,zero,zero,zero,zero,zero,zero,xmm0[2],zero,zero,zero,zero,zero,zero,zero,xmm0[3],zero,zero,zero,zero,zero,zero,zero,xmm0[4],zero,zero,zero,zero,zero,zero,zero,xmm0[5],zero,zero,zero,zero,zero,zero,zero,xmm0[6],zero,zero,zero,zero,zero,zero,zero,xmm0[7],zero,zero,zero,zero,zero,zero,zero
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; KNL_64-NEXT: kxnorw %k0, %k0, %k1
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; KNL_64-NEXT: vgatherqps (%rdi,%zmm1,4), %ymm0 {%k1}
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; KNL_64-NEXT: vpmovzxbd {{.*#+}} ymm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; KNL_64-NEXT: movw $255, %ax
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; KNL_64-NEXT: kmovw %eax, %k1
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; KNL_64-NEXT: vgatherdps (%rdi,%zmm1,4), %zmm0 {%k1}
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; KNL_64-NEXT: # kill: def $ymm0 killed $ymm0 killed $zmm0
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; KNL_64-NEXT: retq
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;
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; KNL_32-LABEL: zext_v8i8_index:
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; KNL_32: # %bb.0:
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; KNL_32-NEXT: movl {{[0-9]+}}(%esp), %eax
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; KNL_32-NEXT: vpmovzxbq {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,zero,zero,zero,zero,xmm0[1],zero,zero,zero,zero,zero,zero,zero,xmm0[2],zero,zero,zero,zero,zero,zero,zero,xmm0[3],zero,zero,zero,zero,zero,zero,zero,xmm0[4],zero,zero,zero,zero,zero,zero,zero,xmm0[5],zero,zero,zero,zero,zero,zero,zero,xmm0[6],zero,zero,zero,zero,zero,zero,zero,xmm0[7],zero,zero,zero,zero,zero,zero,zero
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; KNL_32-NEXT: kxnorw %k0, %k0, %k1
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; KNL_32-NEXT: vgatherqps (%eax,%zmm1,4), %ymm0 {%k1}
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; KNL_32-NEXT: vpmovzxbd {{.*#+}} ymm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
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; KNL_32-NEXT: movw $255, %cx
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; KNL_32-NEXT: kmovw %ecx, %k1
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; KNL_32-NEXT: vgatherdps (%eax,%zmm1,4), %zmm0 {%k1}
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; KNL_32-NEXT: # kill: def $ymm0 killed $ymm0 killed $zmm0
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; KNL_32-NEXT: retl
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;
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; SKX-LABEL: zext_v8i8_index:
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; SKX: # %bb.0:
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; SKX-NEXT: vpmovzxbq {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,zero,zero,zero,zero,xmm0[1],zero,zero,zero,zero,zero,zero,zero,xmm0[2],zero,zero,zero,zero,zero,zero,zero,xmm0[3],zero,zero,zero,zero,zero,zero,zero,xmm0[4],zero,zero,zero,zero,zero,zero,zero,xmm0[5],zero,zero,zero,zero,zero,zero,zero,xmm0[6],zero,zero,zero,zero,zero,zero,zero,xmm0[7],zero,zero,zero,zero,zero,zero,zero
|
||||
; SKX-NEXT: vpmovzxbd {{.*#+}} ymm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
|
||||
; SKX-NEXT: kxnorw %k0, %k0, %k1
|
||||
; SKX-NEXT: vgatherqps (%rdi,%zmm1,4), %ymm0 {%k1}
|
||||
; SKX-NEXT: vgatherdps (%rdi,%ymm1,4), %ymm0 {%k1}
|
||||
; SKX-NEXT: retq
|
||||
;
|
||||
; SKX_32-LABEL: zext_v8i8_index:
|
||||
; SKX_32: # %bb.0:
|
||||
; SKX_32-NEXT: movl {{[0-9]+}}(%esp), %eax
|
||||
; SKX_32-NEXT: vpmovzxbq {{.*#+}} zmm1 = xmm0[0],zero,zero,zero,zero,zero,zero,zero,xmm0[1],zero,zero,zero,zero,zero,zero,zero,xmm0[2],zero,zero,zero,zero,zero,zero,zero,xmm0[3],zero,zero,zero,zero,zero,zero,zero,xmm0[4],zero,zero,zero,zero,zero,zero,zero,xmm0[5],zero,zero,zero,zero,zero,zero,zero,xmm0[6],zero,zero,zero,zero,zero,zero,zero,xmm0[7],zero,zero,zero,zero,zero,zero,zero
|
||||
; SKX_32-NEXT: vpmovzxbd {{.*#+}} ymm1 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero,xmm0[4],zero,zero,zero,xmm0[5],zero,zero,zero,xmm0[6],zero,zero,zero,xmm0[7],zero,zero,zero
|
||||
; SKX_32-NEXT: kxnorw %k0, %k0, %k1
|
||||
; SKX_32-NEXT: vgatherqps (%eax,%zmm1,4), %ymm0 {%k1}
|
||||
; SKX_32-NEXT: vgatherdps (%eax,%ymm1,4), %ymm0 {%k1}
|
||||
; SKX_32-NEXT: retl
|
||||
|
||||
%zext_ind = zext <8 x i8> %ind to <8 x i64>
|
||||
|
||||
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