1 //=== MC/MCRegisterInfo.cpp - Target Register Description -------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements MCRegisterInfo functions. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/MC/MCRegisterInfo.h" 15 16 using namespace llvm; 17 18 unsigned MCRegisterInfo::getMatchingSuperReg(unsigned Reg, unsigned SubIdx, 19 const MCRegisterClass *RC) const { 20 for (MCSuperRegIterator Supers(Reg, this); Supers.isValid(); ++Supers) 21 if (RC->contains(*Supers) && Reg == getSubReg(*Supers, SubIdx)) 22 return *Supers; 23 return 0; 24 } 25 26 unsigned MCRegisterInfo::getSubReg(unsigned Reg, unsigned Idx) const { 27 // Get a pointer to the corresponding SubRegIndices list. This list has the 28 // name of each sub-register in the same order as MCSubRegIterator. 29 const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices; 30 for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI) 31 if (*SRI == Idx) 32 return *Subs; 33 return 0; 34 } 35 36 unsigned MCRegisterInfo::getSubRegIndex(unsigned Reg, unsigned SubReg) const { 37 // Get a pointer to the corresponding SubRegIndices list. This list has the 38 // name of each sub-register in the same order as MCSubRegIterator. 39 const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices; 40 for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI) 41 if (*Subs == SubReg) 42 return *SRI; 43 return 0; 44 } 45 46 int MCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const { 47 const DwarfLLVMRegPair *M = isEH ? EHL2DwarfRegs : L2DwarfRegs; 48 unsigned Size = isEH ? EHL2DwarfRegsSize : L2DwarfRegsSize; 49 50 DwarfLLVMRegPair Key = { RegNum, 0 }; 51 const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key); 52 if (I == M+Size || I->FromReg != RegNum) 53 return -1; 54 return I->ToReg; 55 } 56 57 int MCRegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const { 58 const DwarfLLVMRegPair *M = isEH ? EHDwarf2LRegs : Dwarf2LRegs; 59 unsigned Size = isEH ? EHDwarf2LRegsSize : Dwarf2LRegsSize; 60 61 DwarfLLVMRegPair Key = { RegNum, 0 }; 62 const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key); 63 assert(I != M+Size && I->FromReg == RegNum && "Invalid RegNum"); 64 return I->ToReg; 65 } 66 67 int MCRegisterInfo::getSEHRegNum(unsigned RegNum) const { 68 const DenseMap<unsigned, int>::const_iterator I = L2SEHRegs.find(RegNum); 69 if (I == L2SEHRegs.end()) return (int)RegNum; 70 return I->second; 71 } 72
