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| //===-- RegisterAliasing.cpp ------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "RegisterAliasing.h"
namespace llvm {
namespace exegesis {
BitVector getAliasedBits(const MCRegisterInfo &RegInfo,
const BitVector &SourceBits) {
BitVector AliasedBits(RegInfo.getNumRegs());
for (const size_t PhysReg : SourceBits.set_bits()) {
using RegAliasItr = MCRegAliasIterator;
for (auto Itr = RegAliasItr(PhysReg, &RegInfo, true); Itr.isValid();
++Itr) {
AliasedBits.set(*Itr);
}
}
return AliasedBits;
}
RegisterAliasingTracker::RegisterAliasingTracker(const MCRegisterInfo &RegInfo)
: SourceBits(RegInfo.getNumRegs()), AliasedBits(RegInfo.getNumRegs()),
Origins(RegInfo.getNumRegs()) {}
RegisterAliasingTracker::RegisterAliasingTracker(
const MCRegisterInfo &RegInfo, const BitVector &ReservedReg,
const MCRegisterClass &RegClass)
: RegisterAliasingTracker(RegInfo) {
for (MCPhysReg PhysReg : RegClass)
if (!ReservedReg[PhysReg]) // Removing reserved registers.
SourceBits.set(PhysReg);
FillOriginAndAliasedBits(RegInfo, SourceBits);
}
RegisterAliasingTracker::RegisterAliasingTracker(const MCRegisterInfo &RegInfo,
const MCPhysReg PhysReg)
: RegisterAliasingTracker(RegInfo) {
SourceBits.set(PhysReg);
FillOriginAndAliasedBits(RegInfo, SourceBits);
}
void RegisterAliasingTracker::FillOriginAndAliasedBits(
const MCRegisterInfo &RegInfo, const BitVector &SourceBits) {
using RegAliasItr = MCRegAliasIterator;
for (const size_t PhysReg : SourceBits.set_bits()) {
for (auto Itr = RegAliasItr(PhysReg, &RegInfo, true); Itr.isValid();
++Itr) {
AliasedBits.set(*Itr);
Origins[*Itr] = PhysReg;
}
}
}
RegisterAliasingTrackerCache::RegisterAliasingTrackerCache(
const MCRegisterInfo &RegInfo, const BitVector &ReservedReg)
: RegInfo(RegInfo), ReservedReg(ReservedReg),
EmptyRegisters(RegInfo.getNumRegs()) {}
const RegisterAliasingTracker &
RegisterAliasingTrackerCache::getRegister(MCPhysReg PhysReg) const {
auto &Found = Registers[PhysReg];
if (!Found)
Found.reset(new RegisterAliasingTracker(RegInfo, PhysReg));
return *Found;
}
const RegisterAliasingTracker &
RegisterAliasingTrackerCache::getRegisterClass(unsigned RegClassIndex) const {
auto &Found = RegisterClasses[RegClassIndex];
const auto &RegClass = RegInfo.getRegClass(RegClassIndex);
if (!Found)
Found.reset(new RegisterAliasingTracker(RegInfo, ReservedReg, RegClass));
return *Found;
}
} // namespace exegesis
} // namespace llvm
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