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//=== MC/MCRegisterInfo.cpp - Target Register Description -------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements MCRegisterInfo functions.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCRegisterInfo.h"
using namespace llvm;
unsigned MCRegisterInfo::getMatchingSuperReg(unsigned Reg, unsigned SubIdx,
const MCRegisterClass *RC) const {
for (MCSuperRegIterator Supers(Reg, this); Supers.isValid(); ++Supers)
if (RC->contains(*Supers) && Reg == getSubReg(*Supers, SubIdx))
return *Supers;
return 0;
}
unsigned MCRegisterInfo::getSubReg(unsigned Reg, unsigned Idx) const {
assert(Idx && Idx < getNumSubRegIndices() &&
"This is not a subregister index");
// Get a pointer to the corresponding SubRegIndices list. This list has the
// name of each sub-register in the same order as MCSubRegIterator.
const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
if (*SRI == Idx)
return *Subs;
return 0;
}
unsigned MCRegisterInfo::getSubRegIndex(unsigned Reg, unsigned SubReg) const {
assert(SubReg && SubReg < getNumRegs() && "This is not a register");
// Get a pointer to the corresponding SubRegIndices list. This list has the
// name of each sub-register in the same order as MCSubRegIterator.
const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices;
for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI)
if (*Subs == SubReg)
return *SRI;
return 0;
}
int MCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
const DwarfLLVMRegPair *M = isEH ? EHL2DwarfRegs : L2DwarfRegs;
unsigned Size = isEH ? EHL2DwarfRegsSize : L2DwarfRegsSize;
DwarfLLVMRegPair Key = { RegNum, 0 };
const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
if (I == M+Size || I->FromReg != RegNum)
return -1;
return I->ToReg;
}
int MCRegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const {
const DwarfLLVMRegPair *M = isEH ? EHDwarf2LRegs : Dwarf2LRegs;
unsigned Size = isEH ? EHDwarf2LRegsSize : Dwarf2LRegsSize;
DwarfLLVMRegPair Key = { RegNum, 0 };
const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
assert(I != M+Size && I->FromReg == RegNum && "Invalid RegNum");
return I->ToReg;
}
int MCRegisterInfo::getSEHRegNum(unsigned RegNum) const {
const DenseMap<unsigned, int>::const_iterator I = L2SEHRegs.find(RegNum);
if (I == L2SEHRegs.end()) return (int)RegNum;
return I->second;
}
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