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 assert(Idx && Idx < getNumSubRegIndices() && 28 "This is not a subregister index"); 29 // Get a pointer to the corresponding SubRegIndices list. This list has the 30 // name of each sub-register in the same order as MCSubRegIterator. 31 const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices; 32 for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI) 33 if (*SRI == Idx) 34 return *Subs; 35 return 0; 36 } 37 38 unsigned MCRegisterInfo::getSubRegIndex(unsigned Reg, unsigned SubReg) const { 39 assert(SubReg && SubReg < getNumRegs() && "This is not a register"); 40 // Get a pointer to the corresponding SubRegIndices list. This list has the 41 // name of each sub-register in the same order as MCSubRegIterator. 42 const uint16_t *SRI = SubRegIndices + get(Reg).SubRegIndices; 43 for (MCSubRegIterator Subs(Reg, this); Subs.isValid(); ++Subs, ++SRI) 44 if (*Subs == SubReg) 45 return *SRI; 46 return 0; 47 } 48 49 int MCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const { 50 const DwarfLLVMRegPair *M = isEH ? EHL2DwarfRegs : L2DwarfRegs; 51 unsigned Size = isEH ? EHL2DwarfRegsSize : L2DwarfRegsSize; 52 53 DwarfLLVMRegPair Key = { RegNum, 0 }; 54 const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key); 55 if (I == M+Size || I->FromReg != RegNum) 56 return -1; 57 return I->ToReg; 58 } 59 60 int MCRegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const { 61 const DwarfLLVMRegPair *M = isEH ? EHDwarf2LRegs : Dwarf2LRegs; 62 unsigned Size = isEH ? EHDwarf2LRegsSize : Dwarf2LRegsSize; 63 64 DwarfLLVMRegPair Key = { RegNum, 0 }; 65 const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key); 66 assert(I != M+Size && I->FromReg == RegNum && "Invalid RegNum"); 67 return I->ToReg; 68 } 69 70 int MCRegisterInfo::getSEHRegNum(unsigned RegNum) const { 71 const DenseMap<unsigned, int>::const_iterator I = L2SEHRegs.find(RegNum); 72 if (I == L2SEHRegs.end()) return (int)RegNum; 73 return I->second; 74 } 75
