X86/MCTargetDesc/X86MCCodeEmitter.cpp

70   /// REX prefix.
750   // VEX_R: opcode externsion equivalent to REX.R in
759   // VEX_X: equivalent to REX.X, only used when a
762   //  1: Same as REX.X=0 (must be 1 in 32-bit mode)
763   //  0: Same as REX.X=1 (64-bit mode only)
773   // VEX_W: opcode specific (use like REX.W, or used for
1166 /// Determine if the MCInst has to be encoded with a X86-64 REX prefix which
1172   uint8_t REX = 0;
1176     REX |= 1 << 3; // set REX.W
1179     return REX;
1184   // If it accesses SPL, BPL, SIL, or DIL, then it requires a 0x40 REX prefix.
1195       REX |= 0x40; // REX fixed encoding prefix
1200     REX |= isREXExtendedReg(MI, CurOp++) << 0; // REX.B
1204     REX |= isREXExtendedReg(MI, CurOp++) << 2; // REX.R
1205     REX |= isREXExtendedReg(MI, CurOp++) << 0; // REX.B
1209     REX |= isREXExtendedReg(MI, CurOp++) << 2;                        // REX.R
1210     REX |= isREXExtendedReg(MI, MemOperand + X86::AddrBaseReg) << 0;  // REX.B
1211     REX |= isREXExtendedReg(MI, MemOperand + X86::AddrIndexReg) << 1; // REX.X
1215     REX |= isREXExtendedReg(MI, CurOp++) << 0; // REX.B
1216     REX |= isREXExtendedReg(MI, CurOp++) << 2; // REX.R
1219     REX |= isREXExtendedReg(MI, MemOperand + X86::AddrBaseReg) << 0;  // REX.B
1220     REX |= isREXExtendedReg(MI, MemOperand + X86::AddrIndexReg) << 1; // REX.X
1222     REX |= isREXExtendedReg(MI, CurOp++) << 2; // REX.R
1234     REX |= isREXExtendedReg(MI, MemOperand + X86::AddrBaseReg) << 0;  // REX.B
1235     REX |= isREXExtendedReg(MI, MemOperand + X86::AddrIndexReg) << 1; // REX.X
1247     REX |= isREXExtendedReg(MI, CurOp++) << 0; // REX.B
1250   if (REX && UsesHighByteReg)
1252         "Cannot encode high byte register in REX-prefixed instruction");
1254   return REX;
1294 /// \returns true if a REX prefix was used.
1326   // Handle REX prefix.
1329     if (uint8_t REX = determineREXPrefix(MI, TSFlags, MemOperand, Desc)) {
1330       emitByte(0x40 | REX, CurByte, OS);
1334     assert(!(TSFlags & X86II::REX_W) && "REX.W requires 64bit mode.");