core/insn_push_reg.v

   1 `ifdef EXECUTE
   2         `INSN_PUSH_reg: begin   /* PUSH is 16 cycles! */
   3                 case (cycle)
   4                 0:      case (opcode[5:4])
   5                         `INSN_stack_AF: `EXEC_WRITE(`_SP - 1, `_A)
   6                         `INSN_stack_BC: `EXEC_WRITE(`_SP - 1, `_B)
   7                         `INSN_stack_DE: `EXEC_WRITE(`_SP - 1, `_D)
   8                         `INSN_stack_HL: `EXEC_WRITE(`_SP - 1, `_H)
   9                         endcase
  10                 1:      case (opcode[5:4])
  11                         `INSN_stack_AF: `EXEC_WRITE(`_SP - 2, `_F)
  12                         `INSN_stack_BC: `EXEC_WRITE(`_SP - 2, `_C)
  13                         `INSN_stack_DE: `EXEC_WRITE(`_SP - 2, `_E)
  14                         `INSN_stack_HL: `EXEC_WRITE(`_SP - 2, `_L)
  15                         endcase
  16                 2:      begin /* Twiddle thumbs. */ end
  17                 3:      begin
  18                                 `EXEC_NEWCYCLE
  19                                 `EXEC_INC_PC
  20                         end
  21                 endcase
  22         end
  23 `endif
  24
  25 `ifdef WRITEBACK
  26         `INSN_PUSH_reg: begin   /* PUSH is 16 cycles! */
  27                 case (cycle)
  28                 0:      begin /* type F */ end
  29                 1:      begin /* type F */ end
  30                 2:      begin /* type F */ end
  31                 3:      `_SP <= `_SP - 2;
  32                 endcase
  33         end
  34 `endif