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