core/insn_incdec16.v

   1 `ifdef EXECUTE
   2         `INSN_INCDEC16: begin
   3                 case (cycle)
   4                 0:      case (opcode[5:4])
   5                         `INSN_reg16_BC: {tmp,tmp2} <= `_BC;
   6                         `INSN_reg16_DE: {tmp,tmp2} <= `_DE;
   7                         `INSN_reg16_HL: {tmp,tmp2} <= `_HL;
   8                         `INSN_reg16_SP: {tmp,tmp2} <= `_SP;
   9                         endcase
  10                 1:      begin
  11                                 `EXEC_INC_PC
  12                                 `EXEC_NEWCYCLE
  13                         end
  14                 endcase
  15         end
  16 `endif
  17
  18 `ifdef WRITEBACK
  19         `INSN_INCDEC16: begin
  20                 case (cycle)
  21                 0:      {tmp,tmp2} <= {tmp,tmp2} +
  22                                 (opcode[3] ? 16'hFFFF : 16'h0001);
  23                 1:      case (opcode[5:4])
  24                         `INSN_reg16_BC: `_BC <= {tmp,tmp2};
  25                         `INSN_reg16_DE: `_DE <= {tmp,tmp2};
  26                         `INSN_reg16_HL: `_HL <= {tmp,tmp2};
  27                         `INSN_reg16_SP: `_SP <= {tmp,tmp2};
  28                         endcase
  29                 endcase
  30         end
  31 `endif