[fpgaboy.git] / core / insn_jr-jrcc.v

`define INSN_JR_imm		9'b000011000
`define INSN_JRCC_imm		9'b0001xx000

`ifdef EXECUTE
	`INSN_JR_imm,`INSN_JRCC_imm: begin
		case (cycle)
		0:	begin
				`EXEC_INC_PC
				`EXEC_READ(`_PC + 1)
			end
		1: 	begin
				`EXEC_INC_PC
				if (opcode[5]) begin	// i.e., JP cc,nn
					/* We need to check the condition code to bail out. */
					case (opcode[4:3])
					`INSN_cc_NZ:	if (`_F[7]) `EXEC_NEWCYCLE
					`INSN_cc_Z:	if (~`_F[7]) `EXEC_NEWCYCLE
					`INSN_cc_NC:	if (`_F[4]) `EXEC_NEWCYCLE
					`INSN_cc_C:	if (~`_F[4]) `EXEC_NEWCYCLE
					endcase
				end
			end
		2:	`EXEC_NEWCYCLE
		endcase
	end
`endif

`ifdef WRITEBACK
	`INSN_JR_imm,`INSN_JRCC_imm: begin
		case (cycle)
		0:	begin /* type F */ end
		1:	tmp <= rdata;
		2:	`_PC <= `_PC + {tmp[7]?8'hFF:8'h00,tmp};
		endcase
	end
`endif
Commit	Line	Data
e7fe9dc2 JW	1	`define INSN_JR_imm 9'b000011000
	2	`define INSN_JRCC_imm 9'b0001xx000
	3
df770340 JW	4	`ifdef EXECUTE
	5	`INSN_JR_imm,`INSN_JRCC_imm: begin
	6	case (cycle)
	7	0: begin
5c33c5c0 JW	8	`EXEC_INC_PC
5c33c5c0 JW	9	`EXEC_READ(`_PC + 1)
df770340	10	end
5c33c5c0 JW	11	1: begin
5c33c5c0 JW	12	`EXEC_INC_PC
df770340 JW	13	if (opcode[5]) begin // i.e., JP cc,nn
	14	/* We need to check the condition code to bail out. */
	15	case (opcode[4:3])
5c33c5c0 JW	16	`INSN_cc_NZ: if (`_F[7]) `EXEC_NEWCYCLE
	17	`INSN_cc_Z: if (~`_F[7]) `EXEC_NEWCYCLE
	18	`INSN_cc_NC: if (`_F[4]) `EXEC_NEWCYCLE
	19	`INSN_cc_C: if (~`_F[4]) `EXEC_NEWCYCLE
df770340 JW	20	endcase
	21	end
	22	end
5c33c5c0	23	2: `EXEC_NEWCYCLE
df770340 JW	24	endcase
	25	end
	26	`endif
	27
	28	`ifdef WRITEBACK
	29	`INSN_JR_imm,`INSN_JRCC_imm: begin
	30	case (cycle)
	31	0: begin /* type F */ end
	32	1: tmp <= rdata;
5c33c5c0	33	2: `_PC <= `_PC + {tmp[7]?8'hFF:8'h00,tmp};
df770340 JW	34	endcase
	35	end
	36	`endif