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| 1 | +//===- CombinerHelperArtifacts.cpp-----------------------------------------===// |
| 2 | +// |
| 3 | +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | +// See https://llvm.org/LICENSE.txt for license information. |
| 5 | +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | +// |
| 7 | +//===----------------------------------------------------------------------===// |
| 8 | +// |
| 9 | +// This file implements CombinerHelper for legalization artifacts. |
| 10 | +// |
| 11 | +//===----------------------------------------------------------------------===// |
| 12 | +// |
| 13 | +// G_UNMERGE_VALUES |
| 14 | +// |
| 15 | +//===----------------------------------------------------------------------===// |
| 16 | +#include "llvm/CodeGen/GlobalISel/CombinerHelper.h" |
| 17 | +#include "llvm/CodeGen/GlobalISel/LegalizerHelper.h" |
| 18 | +#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h" |
| 19 | +#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h" |
| 20 | +#include "llvm/CodeGen/GlobalISel/Utils.h" |
| 21 | +#include "llvm/CodeGen/LowLevelTypeUtils.h" |
| 22 | +#include "llvm/CodeGen/MachineOperand.h" |
| 23 | +#include "llvm/CodeGen/MachineRegisterInfo.h" |
| 24 | +#include "llvm/CodeGen/TargetOpcodes.h" |
| 25 | +#include "llvm/Support/Casting.h" |
| 26 | + |
| 27 | +#define DEBUG_TYPE "gi-combiner" |
| 28 | + |
| 29 | +using namespace llvm; |
| 30 | + |
| 31 | +bool CombinerHelper::matchUnmergeValuesAnyExtBuildVector(const MachineInstr &MI, |
| 32 | + BuildFnTy &MatchInfo) { |
| 33 | + const GUnmerge *Unmerge = cast<GUnmerge>(&MI); |
| 34 | + |
| 35 | + if (!MRI.hasOneNonDBGUse(Unmerge->getSourceReg())) |
| 36 | + return false; |
| 37 | + |
| 38 | + const MachineInstr *Source = MRI.getVRegDef(Unmerge->getSourceReg()); |
| 39 | + |
| 40 | + LLT DstTy = MRI.getType(Unmerge->getReg(0)); |
| 41 | + |
| 42 | + // $bv:_(<8 x s8>) = G_BUILD_VECTOR .... |
| 43 | + // $any:_(<8 x s16>) = G_ANYEXT $bv |
| 44 | + // $uv:_(<4 x s16>), $uv1:_(<4 x s16>) = G_UNMERGE_VALUES $any |
| 45 | + // |
| 46 | + // -> |
| 47 | + // |
| 48 | + // $any:_(s16) = G_ANYEXT $bv[0] |
| 49 | + // $any1:_(s16) = G_ANYEXT $bv[1] |
| 50 | + // $any2:_(s16) = G_ANYEXT $bv[2] |
| 51 | + // $any3:_(s16) = G_ANYEXT $bv[3] |
| 52 | + // $any4:_(s16) = G_ANYEXT $bv[4] |
| 53 | + // $any5:_(s16) = G_ANYEXT $bv[5] |
| 54 | + // $any6:_(s16) = G_ANYEXT $bv[6] |
| 55 | + // $any7:_(s16) = G_ANYEXT $bv[7] |
| 56 | + // $uv:_(<4 x s16>) = G_BUILD_VECTOR $any, $any1, $any2, $any3 |
| 57 | + // $uv1:_(<4 x s16>) = G_BUILD_VECTOR $any4, $any5, $any6, $any7 |
| 58 | + |
| 59 | + // We want to unmerge into vectors. |
| 60 | + if (!DstTy.isFixedVector()) |
| 61 | + return false; |
| 62 | + |
| 63 | + const GAnyExt *Any = dyn_cast<GAnyExt>(Source); |
| 64 | + if (!Any) |
| 65 | + return false; |
| 66 | + |
| 67 | + const MachineInstr *NextSource = MRI.getVRegDef(Any->getSrcReg()); |
| 68 | + |
| 69 | + if (const GBuildVector *BV = dyn_cast<GBuildVector>(NextSource)) { |
| 70 | + // G_UNMERGE_VALUES G_ANYEXT G_BUILD_VECTOR |
| 71 | + |
| 72 | + if (!MRI.hasOneNonDBGUse(BV->getReg(0))) |
| 73 | + return false; |
| 74 | + |
| 75 | + // FIXME: check element types? |
| 76 | + if (BV->getNumSources() % Unmerge->getNumDefs() != 0) |
| 77 | + return false; |
| 78 | + |
| 79 | + LLT BigBvTy = MRI.getType(BV->getReg(0)); |
| 80 | + LLT SmallBvTy = DstTy; |
| 81 | + LLT SmallBvElemenTy = SmallBvTy.getElementType(); |
| 82 | + |
| 83 | + if (!isLegalOrBeforeLegalizer( |
| 84 | + {TargetOpcode::G_BUILD_VECTOR, {SmallBvTy, SmallBvElemenTy}})) |
| 85 | + return false; |
| 86 | + |
| 87 | + // We check the legality of scalar anyext. |
| 88 | + if (!isLegalOrBeforeLegalizer( |
| 89 | + {TargetOpcode::G_ANYEXT, |
| 90 | + {SmallBvElemenTy, BigBvTy.getElementType()}})) |
| 91 | + return false; |
| 92 | + |
| 93 | + MatchInfo = [=](MachineIRBuilder &B) { |
| 94 | + // Build into each G_UNMERGE_VALUES def |
| 95 | + // a small build vector with anyext from the source build vector. |
| 96 | + for (unsigned I = 0; I < Unmerge->getNumDefs(); ++I) { |
| 97 | + SmallVector<Register> Ops; |
| 98 | + for (unsigned J = 0; J < SmallBvTy.getNumElements(); ++J) { |
| 99 | + Register SourceArray = |
| 100 | + BV->getSourceReg(I * SmallBvTy.getNumElements() + J); |
| 101 | + auto AnyExt = B.buildAnyExt(SmallBvElemenTy, SourceArray); |
| 102 | + Ops.push_back(AnyExt.getReg(0)); |
| 103 | + } |
| 104 | + B.buildBuildVector(Unmerge->getOperand(I).getReg(), Ops); |
| 105 | + }; |
| 106 | + }; |
| 107 | + return true; |
| 108 | + }; |
| 109 | + |
| 110 | + return false; |
| 111 | +} |
| 112 | + |
| 113 | +bool CombinerHelper::matchUnmergeValuesOfScalarAndVector(const MachineInstr &MI, |
| 114 | + BuildFnTy &MatchInfo) { |
| 115 | + |
| 116 | + constexpr unsigned MAX_NUM_DEFS_LIMIT = 8; |
| 117 | + |
| 118 | + // %opaque:_(<2 x s64>) = G_OPAQUE |
| 119 | + // %un1:_(s64), %un2:_(s64) = G_UNMERGE_VALUES %opaque(<2 x s64>) |
| 120 | + // |
| 121 | + // -> |
| 122 | + // |
| 123 | + // %zero:_(s64) = G_CONSTANT i64 0 |
| 124 | + // %one:_(s64) = G_CONSTANT i64 1 |
| 125 | + // %un1:_(s64) = G_EXTRACT_VECTOR_ELT %opaque, $zero |
| 126 | + // %un2:_(s64) = G_EXTRACT_VECTOR_ELT %opaque, $one |
| 127 | + |
| 128 | + const GUnmerge *Unmerge = cast<GUnmerge>(&MI); |
| 129 | + |
| 130 | + if (Unmerge->getNumDefs() > MAX_NUM_DEFS_LIMIT) |
| 131 | + return false; |
| 132 | + |
| 133 | + LLT DstTy = MRI.getType(Unmerge->getReg(0)); |
| 134 | + LLT SrcTy = MRI.getType(Unmerge->getSourceReg()); |
| 135 | + |
| 136 | + // We want to unmerge a vector into scalars. |
| 137 | + if (!DstTy.isScalar() || !SrcTy.isFixedVector() || DstTy.getSizeInBits() > 64) |
| 138 | + return false; |
| 139 | + |
| 140 | + if (DstTy != SrcTy.getElementType()) |
| 141 | + return false; |
| 142 | + |
| 143 | + // We want to unmerge from an opaque vector. |
| 144 | + const MachineInstr *Source = MRI.getVRegDef(Unmerge->getSourceReg()); |
| 145 | + if (isa<GBuildVector>(Source)) |
| 146 | + return false; |
| 147 | + |
| 148 | + unsigned PreferredVecIdxWidth = |
| 149 | + getTargetLowering().getVectorIdxTy(getDataLayout()).getSizeInBits(); |
| 150 | + |
| 151 | + LLT IdxTy = LLT::scalar(PreferredVecIdxWidth); |
| 152 | + |
| 153 | + if (!isLegalOrBeforeLegalizer( |
| 154 | + {TargetOpcode::G_EXTRACT_VECTOR_ELT, {DstTy, SrcTy, IdxTy}})) |
| 155 | + return false; |
| 156 | + |
| 157 | + if (!isConstantLegalOrBeforeLegalizer(IdxTy)) |
| 158 | + return false; |
| 159 | + |
| 160 | + MatchInfo = [=](MachineIRBuilder &B) { |
| 161 | + for (unsigned I = 0; I < Unmerge->getNumDefs(); ++I) { |
| 162 | + auto Index = B.buildConstant(IdxTy, I); |
| 163 | + B.buildExtractVectorElement(Unmerge->getOperand(I).getReg(), |
| 164 | + Unmerge->getSourceReg(), Index); |
| 165 | + } |
| 166 | + }; |
| 167 | + |
| 168 | + return true; |
| 169 | +} |
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