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//=== RISCVPreLegalizerCombiner.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/CSEInfo.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 "RISCVGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_DEPS
#define DEBUG_TYPE "riscv-prelegalizer-combiner"
using namespace llvm;
namespace {
#define GET_GICOMBINER_TYPES
#include "RISCVGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_TYPES
class RISCVPreLegalizerCombinerImpl : public Combiner {
protected:
// TODO: Make CombinerHelper methods const.
mutable CombinerHelper Helper;
const RISCVPreLegalizerCombinerImplRuleConfig &RuleConfig;
const RISCVSubtarget &STI;
public:
RISCVPreLegalizerCombinerImpl(
MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC,
GISelKnownBits &KB, GISelCSEInfo *CSEInfo,
const RISCVPreLegalizerCombinerImplRuleConfig &RuleConfig,
const RISCVSubtarget &STI, MachineDominatorTree *MDT,
const LegalizerInfo *LI);
static const char *getName() { return "RISCV00PreLegalizerCombiner"; }
bool tryCombineAll(MachineInstr &I) const override;
private:
#define GET_GICOMBINER_CLASS_MEMBERS
#include "RISCVGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_CLASS_MEMBERS
};
#define GET_GICOMBINER_IMPL
#include "RISCVGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_IMPL
RISCVPreLegalizerCombinerImpl::RISCVPreLegalizerCombinerImpl(
MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC,
GISelKnownBits &KB, GISelCSEInfo *CSEInfo,
const RISCVPreLegalizerCombinerImplRuleConfig &RuleConfig,
const RISCVSubtarget &STI, MachineDominatorTree *MDT,
const LegalizerInfo *LI)
: Combiner(MF, CInfo, TPC, &KB, CSEInfo),
Helper(Observer, B, /*IsPreLegalize*/ true, &KB, MDT, LI),
RuleConfig(RuleConfig), STI(STI),
#define GET_GICOMBINER_CONSTRUCTOR_INITS
#include "RISCVGenPreLegalizeGICombiner.inc"
#undef GET_GICOMBINER_CONSTRUCTOR_INITS
{
}
// Pass boilerplate
// ================
class RISCVPreLegalizerCombiner : public MachineFunctionPass {
public:
static char ID;
RISCVPreLegalizerCombiner();
StringRef getPassName() const override { return "RISCVPreLegalizerCombiner"; }
bool runOnMachineFunction(MachineFunction &MF) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
private:
RISCVPreLegalizerCombinerImplRuleConfig RuleConfig;
};
} // end anonymous namespace
void RISCVPreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<TargetPassConfig>();
AU.setPreservesCFG();
getSelectionDAGFallbackAnalysisUsage(AU);
AU.addRequired<GISelKnownBitsAnalysis>();
AU.addPreserved<GISelKnownBitsAnalysis>();
AU.addRequired<MachineDominatorTree>();
AU.addPreserved<MachineDominatorTree>();
AU.addRequired<GISelCSEAnalysisWrapperPass>();
AU.addPreserved<GISelCSEAnalysisWrapperPass>();
MachineFunctionPass::getAnalysisUsage(AU);
}
RISCVPreLegalizerCombiner::RISCVPreLegalizerCombiner()
: MachineFunctionPass(ID) {
initializeRISCVPreLegalizerCombinerPass(*PassRegistry::getPassRegistry());
if (!RuleConfig.parseCommandLineOption())
report_fatal_error("Invalid rule identifier");
}
bool RISCVPreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) {
if (MF.getProperties().hasProperty(
MachineFunctionProperties::Property::FailedISel))
return false;
auto &TPC = getAnalysis<TargetPassConfig>();
// Enable CSE.
GISelCSEAnalysisWrapper &Wrapper =
getAnalysis<GISelCSEAnalysisWrapperPass>().getCSEWrapper();
auto *CSEInfo = &Wrapper.get(TPC.getCSEConfig());
const RISCVSubtarget &ST = MF.getSubtarget<RISCVSubtarget>();
const auto *LI = ST.getLegalizerInfo();
const Function &F = MF.getFunction();
bool EnableOpt =
MF.getTarget().getOptLevel() != CodeGenOptLevel::None && !skipFunction(F);
GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF);
MachineDominatorTree *MDT = &getAnalysis<MachineDominatorTree>();
CombinerInfo CInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false,
/*LegalizerInfo*/ nullptr, EnableOpt, F.hasOptSize(),
F.hasMinSize());
RISCVPreLegalizerCombinerImpl Impl(MF, CInfo, &TPC, *KB, CSEInfo, RuleConfig,
ST, MDT, LI);
return Impl.combineMachineInstrs();
}
char RISCVPreLegalizerCombiner::ID = 0;
INITIALIZE_PASS_BEGIN(RISCVPreLegalizerCombiner, 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(RISCVPreLegalizerCombiner, DEBUG_TYPE,
"Combine RISC-V machine instrs before legalization", false,
false)
namespace llvm {
FunctionPass *createRISCVPreLegalizerCombiner() {
return new RISCVPreLegalizerCombiner();
}
} // end namespace llvm
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