| //=== 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; |
| } |