blob: 039f78db985faf0dd99a4e0011e0345f269a47f3 [file] [log] [blame]
//===-- RegisterAliasingTracker.cpp -----------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "RegisterAliasing.h"
namespace exegesis {
llvm::BitVector getAliasedBits(const llvm::MCRegisterInfo &RegInfo,
const llvm::BitVector &SourceBits) {
llvm::BitVector AliasedBits(RegInfo.getNumRegs());
for (const size_t PhysReg : SourceBits.set_bits()) {
using RegAliasItr = llvm::MCRegAliasIterator;
for (auto Itr = RegAliasItr(PhysReg, &RegInfo, true); Itr.isValid();
++Itr) {
AliasedBits.set(*Itr);
}
}
return AliasedBits;
}
RegisterAliasingTracker::RegisterAliasingTracker(
const llvm::MCRegisterInfo &RegInfo)
: SourceBits(RegInfo.getNumRegs()), AliasedBits(RegInfo.getNumRegs()),
Origins(RegInfo.getNumRegs()) {}
RegisterAliasingTracker::RegisterAliasingTracker(
const llvm::MCRegisterInfo &RegInfo, const llvm::BitVector &ReservedReg,
const llvm::MCRegisterClass &RegClass)
: RegisterAliasingTracker(RegInfo) {
for (llvm::MCPhysReg PhysReg : RegClass)
if (!ReservedReg[PhysReg]) // Removing reserved registers.
SourceBits.set(PhysReg);
FillOriginAndAliasedBits(RegInfo, SourceBits);
}
RegisterAliasingTracker::RegisterAliasingTracker(
const llvm::MCRegisterInfo &RegInfo, const llvm::MCPhysReg PhysReg)
: RegisterAliasingTracker(RegInfo) {
SourceBits.set(PhysReg);
FillOriginAndAliasedBits(RegInfo, SourceBits);
}
void RegisterAliasingTracker::FillOriginAndAliasedBits(
const llvm::MCRegisterInfo &RegInfo, const llvm::BitVector &SourceBits) {
using RegAliasItr = llvm::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 llvm::MCRegisterInfo &RegInfo, const llvm::BitVector &ReservedReg)
: RegInfo(RegInfo), ReservedReg(ReservedReg),
EmptyRegisters(RegInfo.getNumRegs()) {}
const RegisterAliasingTracker &
RegisterAliasingTrackerCache::getRegister(llvm::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