[fpgaboy.git] / core / insn_push_reg.v

`define INSN_PUSH_reg		9'b011xx0101

`ifdef EXECUTE
	`INSN_PUSH_reg: begin	/* PUSH is 16 cycles! */
		case (cycle)
		0:	case (opcode[5:4])
			`INSN_stack_AF:	`EXEC_WRITE(`_SP - 1, `_A)
			`INSN_stack_BC:	`EXEC_WRITE(`_SP - 1, `_B)
			`INSN_stack_DE:	`EXEC_WRITE(`_SP - 1, `_D)
			`INSN_stack_HL:	`EXEC_WRITE(`_SP - 1, `_H)
			endcase
		1:	case (opcode[5:4])
			`INSN_stack_AF:	`EXEC_WRITE(`_SP - 2, `_F)
			`INSN_stack_BC:	`EXEC_WRITE(`_SP - 2, `_C)
			`INSN_stack_DE:	`EXEC_WRITE(`_SP - 2, `_E)
			`INSN_stack_HL:	`EXEC_WRITE(`_SP - 2, `_L)
			endcase
		2:	begin /* Twiddle thumbs. */ end
		3:	begin
				`EXEC_NEWCYCLE
				`EXEC_INC_PC
			end
		endcase
	end
`endif

`ifdef WRITEBACK
	`INSN_PUSH_reg: begin	/* PUSH is 16 cycles! */
		case (cycle)
		0:	begin /* type F */ end
		1:	begin /* type F */ end
		2:	begin /* type F */ end
		3:	`_SP <= `_SP - 2;
		endcase
	end
`endif
Commit	Line	Data
e7fe9dc2 JW	1	`define INSN_PUSH_reg 9'b011xx0101
e7fe9dc2 JW	2
81358c71 JW	3	`ifdef EXECUTE
	4	`INSN_PUSH_reg: begin /* PUSH is 16 cycles! */
	5	case (cycle)
5c33c5c0 JW	6	0: case (opcode[5:4])
	7	`INSN_stack_AF: `EXEC_WRITE(`_SP - 1, `_A)
	8	`INSN_stack_BC: `EXEC_WRITE(`_SP - 1, `_B)
	9	`INSN_stack_DE: `EXEC_WRITE(`_SP - 1, `_D)
	10	`INSN_stack_HL: `EXEC_WRITE(`_SP - 1, `_H)
	11	endcase
	12	1: case (opcode[5:4])
6c46357c JW	13	`INSN_stack_AF: `EXEC_WRITE(`_SP - 2, `_F)
	14	`INSN_stack_BC: `EXEC_WRITE(`_SP - 2, `_C)
	15	`INSN_stack_DE: `EXEC_WRITE(`_SP - 2, `_E)
	16	`INSN_stack_HL: `EXEC_WRITE(`_SP - 2, `_L)
5c33c5c0	17	endcase
81358c71 JW	18	2: begin /* Twiddle thumbs. */ end
81358c71 JW	19	3: begin
5c33c5c0 JW	20	`EXEC_NEWCYCLE
5c33c5c0 JW	21	`EXEC_INC_PC
81358c71 JW	22	end
	23	endcase
	24	end
	25	`endif
	26
	27	`ifdef WRITEBACK
	28	`INSN_PUSH_reg: begin /* PUSH is 16 cycles! */
	29	case (cycle)
	30	0: begin /* type F */ end
	31	1: begin /* type F */ end
	32	2: begin /* type F */ end
5c33c5c0	33	3: `_SP <= `_SP - 2;
81358c71 JW	34	endcase
	35	end
	36	`endif