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//=== lib/CodeGen/GlobalISel/AArch64PreLegalizerCombiner.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 "AArch64TargetMachine.h"
#include "llvm/CodeGen/GlobalISel/Combiner.h"
#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
#include "llvm/CodeGen/GlobalISel/CombinerInfo.h"
#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h"
#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "aarch64-prelegalizer-combiner"
using namespace llvm;
using namespace MIPatternMatch;
/// Return true if a G_FCONSTANT instruction is known to be better-represented
/// as a G_CONSTANT.
static bool matchFConstantToConstant(MachineInstr &MI,
MachineRegisterInfo &MRI) {
assert(MI.getOpcode() == TargetOpcode::G_FCONSTANT);
Register DstReg = MI.getOperand(0).getReg();
const unsigned DstSize = MRI.getType(DstReg).getSizeInBits();
if (DstSize != 32 && DstSize != 64)
return false;
// When we're storing a value, it doesn't matter what register bank it's on.
// Since not all floating point constants can be materialized using a fmov,
// it makes more sense to just use a GPR.
return all_of(MRI.use_nodbg_instructions(DstReg),
[](const MachineInstr &Use) { return Use.mayStore(); });
}
/// Change a G_FCONSTANT into a G_CONSTANT.
static void applyFConstantToConstant(MachineInstr &MI) {
assert(MI.getOpcode() == TargetOpcode::G_FCONSTANT);
MachineIRBuilder MIB(MI);
const APFloat &ImmValAPF = MI.getOperand(1).getFPImm()->getValueAPF();
MIB.buildConstant(MI.getOperand(0).getReg(), ImmValAPF.bitcastToAPInt());
MI.eraseFromParent();
}
class AArch64PreLegalizerCombinerHelperState {
protected:
CombinerHelper &Helper;
public:
AArch64PreLegalizerCombinerHelperState(CombinerHelper &Helper)
: Helper(Helper) {}
};
#define AARCH64PRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_DEPS
#include "AArch64GenPreLegalizeGICombiner.inc"
#undef AARCH64PRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_DEPS
namespace {
#define AARCH64PRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_H
#include "AArch64GenPreLegalizeGICombiner.inc"
#undef AARCH64PRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_H
class AArch64PreLegalizerCombinerInfo : public CombinerInfo {
GISelKnownBits *KB;
MachineDominatorTree *MDT;
AArch64GenPreLegalizerCombinerHelperRuleConfig GeneratedRuleCfg;
public:
AArch64PreLegalizerCombinerInfo(bool EnableOpt, bool OptSize, bool MinSize,
GISelKnownBits *KB, MachineDominatorTree *MDT)
: CombinerInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false,
/*LegalizerInfo*/ nullptr, EnableOpt, OptSize, MinSize),
KB(KB), MDT(MDT) {
if (!GeneratedRuleCfg.parseCommandLineOption())
report_fatal_error("Invalid rule identifier");
}
virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI,
MachineIRBuilder &B) const override;
};
bool AArch64PreLegalizerCombinerInfo::combine(GISelChangeObserver &Observer,
MachineInstr &MI,
MachineIRBuilder &B) const {
CombinerHelper Helper(Observer, B, KB, MDT);
AArch64GenPreLegalizerCombinerHelper Generated(GeneratedRuleCfg, Helper);
if (Generated.tryCombineAll(Observer, MI, B))
return true;
switch (MI.getOpcode()) {
case TargetOpcode::G_CONCAT_VECTORS:
return Helper.tryCombineConcatVectors(MI);
case TargetOpcode::G_SHUFFLE_VECTOR:
return Helper.tryCombineShuffleVector(MI);
case TargetOpcode::G_MEMCPY:
case TargetOpcode::G_MEMMOVE:
case TargetOpcode::G_MEMSET: {
// If we're at -O0 set a maxlen of 32 to inline, otherwise let the other
// heuristics decide.
unsigned MaxLen = EnableOpt ? 0 : 32;
// Try to inline memcpy type calls if optimizations are enabled.
return !EnableMinSize ? Helper.tryCombineMemCpyFamily(MI, MaxLen) : false;
}
}
return false;
}
#define AARCH64PRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_CPP
#include "AArch64GenPreLegalizeGICombiner.inc"
#undef AARCH64PRELEGALIZERCOMBINERHELPER_GENCOMBINERHELPER_CPP
// Pass boilerplate
// ================
class AArch64PreLegalizerCombiner : public MachineFunctionPass {
public:
static char ID;
AArch64PreLegalizerCombiner(bool IsOptNone = false);
StringRef getPassName() const override { return "AArch64PreLegalizerCombiner"; }
bool runOnMachineFunction(MachineFunction &MF) override;
void getAnalysisUsage(AnalysisUsage &AU) const override;
private:
bool IsOptNone;
};
} // end anonymous namespace
void AArch64PreLegalizerCombiner::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);
}
AArch64PreLegalizerCombiner::AArch64PreLegalizerCombiner(bool IsOptNone)
: MachineFunctionPass(ID), IsOptNone(IsOptNone) {
initializeAArch64PreLegalizerCombinerPass(*PassRegistry::getPassRegistry());
}
bool AArch64PreLegalizerCombiner::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);
GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF);
MachineDominatorTree *MDT =
IsOptNone ? nullptr : &getAnalysis<MachineDominatorTree>();
AArch64PreLegalizerCombinerInfo PCInfo(EnableOpt, F.hasOptSize(),
F.hasMinSize(), KB, MDT);
Combiner C(PCInfo, TPC);
return C.combineMachineInstrs(MF, /*CSEInfo*/ nullptr);
}
char AArch64PreLegalizerCombiner::ID = 0;
INITIALIZE_PASS_BEGIN(AArch64PreLegalizerCombiner, DEBUG_TYPE,
"Combine AArch64 machine instrs before legalization",
false, false)
INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_DEPENDENCY(GISelKnownBitsAnalysis)
INITIALIZE_PASS_END(AArch64PreLegalizerCombiner, DEBUG_TYPE,
"Combine AArch64 machine instrs before legalization", false,
false)
namespace llvm {
FunctionPass *createAArch64PreLegalizerCombiner(bool IsOptNone) {
return new AArch64PreLegalizerCombiner(IsOptNone);
}
} // end namespace llvm
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