compiler/utils/x86/assembler_x86.cc [1822:1838]:
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void X86Assembler::EmitOperand(int reg_or_opcode, const Operand& operand) {
  CHECK_GE(reg_or_opcode, 0);
  CHECK_LT(reg_or_opcode, 8);
  const int length = operand.length_;
  CHECK_GT(length, 0);
  // Emit the ModRM byte updated with the given reg value.
  CHECK_EQ(operand.encoding_[0] & 0x38, 0);
  EmitUint8(operand.encoding_[0] + (reg_or_opcode << 3));
  // Emit the rest of the encoded operand.
  for (int i = 1; i < length; i++) {
    EmitUint8(operand.encoding_[i]);
  }
  AssemblerFixup* fixup = operand.GetFixup();
  if (fixup != nullptr) {
    EmitFixup(fixup);
  }
}
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compiler/utils/x86_64/assembler_x86_64.cc [2377:2393]:
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void X86_64Assembler::EmitOperand(uint8_t reg_or_opcode, const Operand& operand) {
  CHECK_GE(reg_or_opcode, 0);
  CHECK_LT(reg_or_opcode, 8);
  const int length = operand.length_;
  CHECK_GT(length, 0);
  // Emit the ModRM byte updated with the given reg value.
  CHECK_EQ(operand.encoding_[0] & 0x38, 0);
  EmitUint8(operand.encoding_[0] + (reg_or_opcode << 3));
  // Emit the rest of the encoded operand.
  for (int i = 1; i < length; i++) {
    EmitUint8(operand.encoding_[i]);
  }
  AssemblerFixup* fixup = operand.GetFixup();
  if (fixup != nullptr) {
    EmitFixup(fixup);
  }
}
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