src/llvm/lib/MC/MCRegisterInfo.cpp

   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 unsigned MCRegisterInfo::getSubRegIdxSize(unsigned Idx) const {
  50   assert(Idx && Idx < getNumSubRegIndices() &&
  51          "This is not a subregister index");
  52   return SubRegIdxRanges[Idx].Size;
  53 }
  54
  55 unsigned MCRegisterInfo::getSubRegIdxOffset(unsigned Idx) const {
  56   assert(Idx && Idx < getNumSubRegIndices() &&
  57          "This is not a subregister index");
  58   return SubRegIdxRanges[Idx].Offset;
  59 }
  60
  61 int MCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
  62   const DwarfLLVMRegPair *M = isEH ? EHL2DwarfRegs : L2DwarfRegs;
  63   unsigned Size = isEH ? EHL2DwarfRegsSize : L2DwarfRegsSize;
  64
  65   DwarfLLVMRegPair Key = { RegNum, 0 };
  66   const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
  67   if (I == M+Size || I->FromReg != RegNum)
  68     return -1;
  69   return I->ToReg;
  70 }
  71
  72 int MCRegisterInfo::getLLVMRegNum(unsigned RegNum, bool isEH) const {
  73   const DwarfLLVMRegPair *M = isEH ? EHDwarf2LRegs : Dwarf2LRegs;
  74   unsigned Size = isEH ? EHDwarf2LRegsSize : Dwarf2LRegsSize;
  75
  76   DwarfLLVMRegPair Key = { RegNum, 0 };
  77   const DwarfLLVMRegPair *I = std::lower_bound(M, M+Size, Key);
  78   assert(I != M+Size && I->FromReg == RegNum && "Invalid RegNum");
  79   return I->ToReg;
  80 }
  81
  82 int MCRegisterInfo::getSEHRegNum(unsigned RegNum) const {
  83   const DenseMap<unsigned, int>::const_iterator I = L2SEHRegs.find(RegNum);
  84   if (I == L2SEHRegs.end()) return (int)RegNum;
  85   return I->second;
  86 }