7feb816ed0
This enables NewPM ports since it removes multiple pass dependencies on `TargetPassConfig` which we don't want to port to the NewPM. It looks like no derived classes of Combiner actually use this pointer, and it is also unused in the Combiner class.
140 lines
4.8 KiB
C++
140 lines
4.8 KiB
C++
//=== lib/CodeGen/GlobalISel/MipsPreLegalizerCombiner.cpp --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass does combining of machine instructions at the generic MI level,
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// before the legalizer.
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//
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//===----------------------------------------------------------------------===//
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#include "MipsLegalizerInfo.h"
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#include "MipsTargetMachine.h"
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#include "llvm/CodeGen/GlobalISel/Combiner.h"
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#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
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#include "llvm/CodeGen/GlobalISel/CombinerInfo.h"
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#include "llvm/CodeGen/GlobalISel/GISelValueTracking.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/TargetPassConfig.h"
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#define DEBUG_TYPE "mips-prelegalizer-combiner"
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using namespace llvm;
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namespace {
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struct MipsPreLegalizerCombinerInfo : public CombinerInfo {
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public:
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MipsPreLegalizerCombinerInfo()
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: CombinerInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false,
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/*LegalizerInfo*/ nullptr, /*EnableOpt*/ false,
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/*EnableOptSize*/ false, /*EnableMinSize*/ false) {}
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};
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class MipsPreLegalizerCombinerImpl : public Combiner {
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protected:
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const MipsSubtarget &STI;
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const CombinerHelper Helper;
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public:
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MipsPreLegalizerCombinerImpl(MachineFunction &MF, CombinerInfo &CInfo,
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GISelValueTracking &VT, GISelCSEInfo *CSEInfo,
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const MipsSubtarget &STI,
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MachineDominatorTree *MDT,
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const LegalizerInfo *LI)
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: Combiner(MF, CInfo, &VT, CSEInfo), STI(STI),
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Helper(Observer, B, /*IsPreLegalize*/ true, &VT, MDT, LI) {}
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static const char *getName() { return "MipsPreLegalizerCombiner"; }
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void setupGeneratedPerFunctionState(MachineFunction &MF) override {
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// TODO: TableGen-erate this class' impl.
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}
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bool tryCombineAll(MachineInstr &MI) const override {
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switch (MI.getOpcode()) {
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default:
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return false;
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case TargetOpcode::G_MEMCPY_INLINE:
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return Helper.tryEmitMemcpyInline(MI);
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case TargetOpcode::G_LOAD:
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case TargetOpcode::G_SEXTLOAD:
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case TargetOpcode::G_ZEXTLOAD: {
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// Don't attempt to combine non power of 2 loads or unaligned loads when
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// subtarget doesn't support them.
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auto MMO = *MI.memoperands_begin();
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const MipsSubtarget &STI = MI.getMF()->getSubtarget<MipsSubtarget>();
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if (!MMO->getSize().hasValue() ||
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!isPowerOf2_64(MMO->getSize().getValue()))
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return false;
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bool isUnaligned = MMO->getAlign() < MMO->getSize().getValue();
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if (!STI.systemSupportsUnalignedAccess() && isUnaligned)
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return false;
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return Helper.tryCombineExtendingLoads(MI);
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}
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}
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return false;
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}
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};
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// Pass boilerplate
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// ================
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class MipsPreLegalizerCombiner : public MachineFunctionPass {
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public:
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static char ID;
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MipsPreLegalizerCombiner();
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StringRef getPassName() const override { return "MipsPreLegalizerCombiner"; }
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bool runOnMachineFunction(MachineFunction &MF) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override;
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};
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} // end anonymous namespace
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void MipsPreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<GISelValueTrackingAnalysisLegacy>();
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AU.addPreserved<GISelValueTrackingAnalysisLegacy>();
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AU.setPreservesCFG();
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getSelectionDAGFallbackAnalysisUsage(AU);
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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MipsPreLegalizerCombiner::MipsPreLegalizerCombiner()
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: MachineFunctionPass(ID) {}
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bool MipsPreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) {
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if (MF.getProperties().hasFailedISel())
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return false;
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const MipsSubtarget &ST = MF.getSubtarget<MipsSubtarget>();
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const MipsLegalizerInfo *LI =
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static_cast<const MipsLegalizerInfo *>(ST.getLegalizerInfo());
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GISelValueTracking *VT =
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&getAnalysis<GISelValueTrackingAnalysisLegacy>().get(MF);
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MipsPreLegalizerCombinerInfo PCInfo;
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MipsPreLegalizerCombinerImpl Impl(MF, PCInfo, *VT, /*CSEInfo*/ nullptr, ST,
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/*MDT*/ nullptr, LI);
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return Impl.combineMachineInstrs();
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}
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char MipsPreLegalizerCombiner::ID = 0;
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INITIALIZE_PASS_BEGIN(MipsPreLegalizerCombiner, DEBUG_TYPE,
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"Combine Mips machine instrs before legalization", false,
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false)
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INITIALIZE_PASS_DEPENDENCY(GISelValueTrackingAnalysisLegacy)
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INITIALIZE_PASS_END(MipsPreLegalizerCombiner, DEBUG_TYPE,
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"Combine Mips machine instrs before legalization", false,
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false)
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FunctionPass *llvm::createMipsPreLegalizeCombiner() {
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return new MipsPreLegalizerCombiner();
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}
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