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//=== RISCVO0PreLegalizerCombiner.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,
// before the legalizer.
//
//===----------------------------------------------------------------------===//
#include "RISCVSubtarget.h"
#include "llvm/CodeGen/GlobalISel/Combiner.h"
#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
#include "llvm/CodeGen/GlobalISel/CombinerInfo.h"
#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h"
#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h"
#include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#define GET_GICOMBINER_DEPS
#include "RISCVGenO0PreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_DEPS
#define DEBUG_TYPE "riscv-O0-prelegalizer-combiner"
using namespace llvm;
namespace {
#define GET_GICOMBINER_TYPES
#include "RISCVGenO0PreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_TYPES
class RISCVO0PreLegalizerCombinerImpl : public Combiner {
protected:
// TODO: Make CombinerHelper methods const.
mutable CombinerHelper Helper;
const RISCVO0PreLegalizerCombinerImplRuleConfig &RuleConfig;
const RISCVSubtarget &STI;
public:
RISCVO0PreLegalizerCombinerImpl(
MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC,
GISelKnownBits &KB, GISelCSEInfo *CSEInfo,
const RISCVO0PreLegalizerCombinerImplRuleConfig &RuleConfig,
const RISCVSubtarget &STI);
static const char *getName() { return "RISCVO0PreLegalizerCombiner"; }
bool tryCombineAll(MachineInstr &I) const override;
private:
#define GET_GICOMBINER_CLASS_MEMBERS
#include "RISCVGenO0PreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_CLASS_MEMBERS
};
#define GET_GICOMBINER_IMPL
#include "RISCVGenO0PreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_IMPL
RISCVO0PreLegalizerCombinerImpl::RISCVO0PreLegalizerCombinerImpl(
MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC,
GISelKnownBits &KB, GISelCSEInfo *CSEInfo,
const RISCVO0PreLegalizerCombinerImplRuleConfig &RuleConfig,
const RISCVSubtarget &STI)
: Combiner(MF, CInfo, TPC, &KB, CSEInfo),
Helper(Observer, B, /*IsPreLegalize*/ true, &KB), RuleConfig(RuleConfig),
STI(STI),
#define GET_GICOMBINER_CONSTRUCTOR_INITS
#include "RISCVGenO0PreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_CONSTRUCTOR_INITS
{
}
// Pass boilerplate
// ================
class RISCVO0PreLegalizerCombiner : public MachineFunctionPass {
public:
static char ID;
RISCVO0PreLegalizerCombiner();
StringRef getPassName() const override {
return "RISCVO0PreLegalizerCombiner";
}
bool runOnMachineFunction(MachineFunction &MF) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
private:
RISCVO0PreLegalizerCombinerImplRuleConfig RuleConfig;
};
} // end anonymous namespace
void RISCVO0PreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<TargetPassConfig>();
AU.setPreservesCFG();
getSelectionDAGFallbackAnalysisUsage(AU);
AU.addRequired<GISelKnownBitsAnalysis>();
AU.addPreserved<GISelKnownBitsAnalysis>();
MachineFunctionPass::getAnalysisUsage(AU);
}
RISCVO0PreLegalizerCombiner::RISCVO0PreLegalizerCombiner()
: MachineFunctionPass(ID) {
initializeRISCVO0PreLegalizerCombinerPass(*PassRegistry::getPassRegistry());
if (!RuleConfig.parseCommandLineOption())
report_fatal_error("Invalid rule identifier");
}
bool RISCVO0PreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) {
if (MF.getProperties().hasProperty(
MachineFunctionProperties::Property::FailedISel))
return false;
auto &TPC = getAnalysis<TargetPassConfig>();
const Function &F = MF.getFunction();
GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF);
const RISCVSubtarget &ST = MF.getSubtarget<RISCVSubtarget>();
CombinerInfo CInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false,
/*LegalizerInfo*/ nullptr, /*EnableOpt*/ false,
F.hasOptSize(), F.hasMinSize());
RISCVO0PreLegalizerCombinerImpl Impl(MF, CInfo, &TPC, *KB,
/*CSEInfo*/ nullptr, RuleConfig, ST);
return Impl.combineMachineInstrs();
}
char RISCVO0PreLegalizerCombiner::ID = 0;
INITIALIZE_PASS_BEGIN(RISCVO0PreLegalizerCombiner, DEBUG_TYPE,
"Combine RISC-V machine instrs before legalization", false,
false)
INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_DEPENDENCY(GISelKnownBitsAnalysis)
INITIALIZE_PASS_DEPENDENCY(GISelCSEAnalysisWrapperPass)
INITIALIZE_PASS_END(RISCVO0PreLegalizerCombiner, DEBUG_TYPE,
"Combine RISC-V machine instrs before legalization", false,
false)
namespace llvm {
FunctionPass *createRISCVO0PreLegalizerCombiner() {
return new RISCVO0PreLegalizerCombiner();
}
} // end namespace llvm
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