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//=== lib/CodeGen/GlobalISel/MipsPostLegalizerCombiner.cpp ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This pass does combining of machine instructions at the generic MI level,
// after the legalizer.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/MipsMCTargetDesc.h"
#include "Mips.h"
#include "MipsLegalizerInfo.h"
#include "MipsSubtarget.h"
#include "llvm/CodeGen/GlobalISel/Combiner.h"
#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
#include "llvm/CodeGen/GlobalISel/CombinerInfo.h"
#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutor.h"
#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h"
#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h"
#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/Target/TargetMachine.h"
#define GET_GICOMBINER_DEPS
#include "MipsGenPostLegalizeGICombiner.inc"
#undef GET_GICOMBINER_DEPS
#define DEBUG_TYPE "mips-postlegalizer-combiner"
using namespace llvm;
using namespace MIPatternMatch;
namespace {
#define GET_GICOMBINER_TYPES
#include "MipsGenPostLegalizeGICombiner.inc"
#undef GET_GICOMBINER_TYPES
class MipsPostLegalizerCombinerImpl : public GIMatchTableExecutor {
protected:
CombinerHelper &Helper;
const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig;
const MipsSubtarget &STI;
GISelChangeObserver &Observer;
MachineIRBuilder &B;
MachineFunction &MF;
MachineRegisterInfo &MRI;
public:
MipsPostLegalizerCombinerImpl(
const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig,
const MipsSubtarget &STI, GISelChangeObserver &Observer,
MachineIRBuilder &B, CombinerHelper &Helper);
static const char *getName() { return "MipsPostLegalizerCombiner"; }
bool tryCombineAll(MachineInstr &I) const;
private:
#define GET_GICOMBINER_CLASS_MEMBERS
#include "MipsGenPostLegalizeGICombiner.inc"
#undef GET_GICOMBINER_CLASS_MEMBERS
};
#define GET_GICOMBINER_IMPL
#include "MipsGenPostLegalizeGICombiner.inc"
#undef GET_GICOMBINER_IMPL
MipsPostLegalizerCombinerImpl::MipsPostLegalizerCombinerImpl(
const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig,
const MipsSubtarget &STI, GISelChangeObserver &Observer,
MachineIRBuilder &B, CombinerHelper &Helper)
: Helper(Helper), RuleConfig(RuleConfig), STI(STI), Observer(Observer),
B(B), MF(B.getMF()), MRI(*B.getMRI()),
#define GET_GICOMBINER_CONSTRUCTOR_INITS
#include "MipsGenPostLegalizeGICombiner.inc"
#undef GET_GICOMBINER_CONSTRUCTOR_INITS
{
}
class MipsPostLegalizerCombinerInfo final : public CombinerInfo {
GISelKnownBits *KB;
public:
MipsPostLegalizerCombinerImplRuleConfig RuleConfig;
MipsPostLegalizerCombinerInfo(bool EnableOpt, bool OptSize, bool MinSize,
GISelKnownBits *KB, const MipsLegalizerInfo *LI)
: CombinerInfo(/*AllowIllegalOps*/ false, /*ShouldLegalizeIllegal*/ true,
/*LegalizerInfo*/ LI, EnableOpt, OptSize, MinSize),
KB(KB) {
if (!RuleConfig.parseCommandLineOption())
report_fatal_error("Invalid rule identifier");
}
bool combine(GISelChangeObserver &Observer, MachineInstr &MI,
MachineIRBuilder &B) const override;
};
bool MipsPostLegalizerCombinerInfo::combine(GISelChangeObserver &Observer,
MachineInstr &MI,
MachineIRBuilder &B) const {
const auto &STI = MI.getMF()->getSubtarget<MipsSubtarget>();
CombinerHelper Helper(Observer, B, /* IsPreLegalize*/ false, KB,
/*DominatorTree*/ nullptr, LInfo);
MipsPostLegalizerCombinerImpl Impl(RuleConfig, STI, Observer, B, Helper);
Impl.setupMF(*MI.getMF(), KB);
return Impl.tryCombineAll(MI);
}
// Pass boilerplate
// ================
class MipsPostLegalizerCombiner : public MachineFunctionPass {
public:
static char ID;
MipsPostLegalizerCombiner(bool IsOptNone = false);
StringRef getPassName() const override {
return "MipsPostLegalizerCombiner";
}
bool runOnMachineFunction(MachineFunction &MF) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
private:
bool IsOptNone;
};
} // end anonymous namespace
void MipsPostLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<TargetPassConfig>();
AU.setPreservesCFG();
getSelectionDAGFallbackAnalysisUsage(AU);
AU.addRequired<GISelKnownBitsAnalysis>();
AU.addPreserved<GISelKnownBitsAnalysis>();
if (!IsOptNone) {
AU.addRequired<MachineDominatorTree>();
AU.addPreserved<MachineDominatorTree>();
}
MachineFunctionPass::getAnalysisUsage(AU);
}
MipsPostLegalizerCombiner::MipsPostLegalizerCombiner(bool IsOptNone)
: MachineFunctionPass(ID), IsOptNone(IsOptNone) {
initializeMipsPostLegalizerCombinerPass(*PassRegistry::getPassRegistry());
}
bool MipsPostLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) {
if (MF.getProperties().hasProperty(
MachineFunctionProperties::Property::FailedISel))
return false;
auto *TPC = &getAnalysis<TargetPassConfig>();
const Function &F = MF.getFunction();
bool EnableOpt =
MF.getTarget().getOptLevel() != CodeGenOpt::None && !skipFunction(F);
const MipsSubtarget &ST = MF.getSubtarget<MipsSubtarget>();
const MipsLegalizerInfo *LI =
static_cast<const MipsLegalizerInfo *>(ST.getLegalizerInfo());
GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF);
MipsPostLegalizerCombinerInfo PCInfo(EnableOpt, F.hasOptSize(),
F.hasMinSize(), KB, LI);
Combiner C(PCInfo, TPC);
return C.combineMachineInstrs(MF, /*CSEInfo*/ nullptr);
}
char MipsPostLegalizerCombiner::ID = 0;
INITIALIZE_PASS_BEGIN(MipsPostLegalizerCombiner, DEBUG_TYPE,
"Combine Mips machine instrs after legalization", false,
false)
INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_DEPENDENCY(GISelKnownBitsAnalysis)
INITIALIZE_PASS_END(MipsPostLegalizerCombiner, DEBUG_TYPE,
"Combine Mips machine instrs after legalization", false,
false)
namespace llvm {
FunctionPass *createMipsPostLegalizeCombiner(bool IsOptNone) {
return new MipsPostLegalizerCombiner(IsOptNone);
}
} // end namespace llvm
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