From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Sun, 6 Apr 2008 07:03:30 +0000 (-0400)
Subject: Split out more insns
X-Git-Url: http://git.joshuawise.com/fpgaboy.git/commitdiff_plain/3ad960bdb71efcbb1dfd436163085da0d70eb699

Split out more insns
---

diff --git a/GBZ80Core.v b/GBZ80Core.v
index d556cd5..f41805a 100644
--- a/GBZ80Core.v
+++ b/GBZ80Core.v
@@ -194,68 +194,6 @@ module GBZ80Core(
 			`define EXECUTE
 			`include "allinsns.v"
 			`undef EXECUTE
-			`INSN_LDH_AC: begin
-				case (cycle)
-				0:	begin
-						address <= {8'hFF,registers[`REG_C]};
-						if (opcode[4]) begin	// LD A,(C)
-							rd <= 1;
-						end else begin
-							wr <= 1;
-							wdata <= registers[`REG_A];
-						end
-					end
-				1:	begin
-						`EXEC_NEWCYCLE;
-						`EXEC_INC_PC;
-					end
-				endcase
-			end
-			`INSN_LDx_AHL: begin
-				case (cycle)
-				0:	begin
-						address <= {registers[`REG_H],registers[`REG_L]};
-						if (opcode[3]) begin	// LDx A, (HL)
-							rd <= 1;
-						end else begin
-							wr <= 1;
-							wdata <= registers[`REG_A];
-						end
-					end
-				1:	begin
-						`EXEC_NEWCYCLE;
-						`EXEC_INC_PC;
-					end
-				endcase
-			end
-			`INSN_ALU8: begin
-				if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 0)) begin
-					// fffffffff fuck your shit, read from (HL) :(
-					rd <= 1;
-					address <= {registers[`REG_H], registers[`REG_L]};
-				end else begin
-					`EXEC_NEWCYCLE;
-					`EXEC_INC_PC;
-					case (opcode[2:0])
-					`INSN_reg_A:	tmp <= registers[`REG_A];
-					`INSN_reg_B:	tmp <= registers[`REG_B];
-					`INSN_reg_C:	tmp <= registers[`REG_C];
-					`INSN_reg_D:	tmp <= registers[`REG_D];
-					`INSN_reg_E:	tmp <= registers[`REG_E];
-					`INSN_reg_H:	tmp <= registers[`REG_H];
-					`INSN_reg_L:	tmp <= registers[`REG_L];
-					`INSN_reg_dHL:	tmp <= rdata;
-					endcase
-				end
-			end
-			`INSN_ALU_A: begin
-				`EXEC_NEWCYCLE;
-				`EXEC_INC_PC;
-			end
-			`INSN_NOP: begin
-				`EXEC_NEWCYCLE;
-				`EXEC_INC_PC;
-			end
 			`INSN_RST: begin
 				case (cycle)
 				0:	begin
@@ -463,147 +401,6 @@ module GBZ80Core(
 			`define WRITEBACK
 			`include "allinsns.v"
 			`undef WRITEBACK
-			`INSN_LDH_AC: begin
-				case (cycle)
-				0:	begin /* Type F */ end
-				1:	if (opcode[4])
-						registers[`REG_A] <= rdata;
-				endcase
-			end
-			`INSN_LDx_AHL: begin
-				case (cycle)
-				0:	begin /* Type F */ end
-				1:	begin
-						if (opcode[3])
-							registers[`REG_A] <= rdata;
-						{registers[`REG_H],registers[`REG_L]} <=
-							opcode[4] ? // if set, LDD, else LDI
-							({registers[`REG_H],registers[`REG_L]} - 1) :
-							({registers[`REG_H],registers[`REG_L]} + 1);
-					end
-				endcase
-			end
-			`INSN_ALU8: begin
-				if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 0)) begin
-					/* Sit on our asses. */
-				end else begin		/* Actually do the computation! */
-					case (opcode[5:3])
-					`INSN_alu_ADD: begin
-						registers[`REG_A] <=
-							registers[`REG_A] + tmp;
-						registers[`REG_F] <=
-							{ /* Z */ ((registers[`REG_A] + tmp) == 0) ? 1'b1 : 1'b0,
-							  /* N */ 1'b0,
-							  /* H */ (({1'b0,registers[`REG_A][3:0]} + {1'b0,tmp[3:0]}) >> 4 == 1) ? 1'b1 : 1'b0,
-							  /* C */ (({1'b0,registers[`REG_A]} + {1'b0,tmp}) >> 8 == 1) ? 1'b1 : 1'b0,
-							  registers[`REG_F][3:0]
-							};
-					end
-					`INSN_alu_ADC: begin
-						registers[`REG_A] <=
-							registers[`REG_A] + tmp + {7'b0,registers[`REG_F][4]};
-						registers[`REG_F] <=
-							{ /* Z */ ((registers[`REG_A] + tmp + {7'b0,registers[`REG_F][4]}) == 0) ? 1'b1 : 1'b0,
-							  /* N */ 1'b0,
-							  /* H */ (({1'b0,registers[`REG_A][3:0]} + {1'b0,tmp[3:0]} + {4'b0,registers[`REG_F][4]}) >> 4 == 1) ? 1'b1 : 1'b0,
-							  /* C */ (({1'b0,registers[`REG_A]} + {1'b0,tmp} + {8'b0,registers[`REG_F][4]}) >> 8 == 1) ? 1'b1 : 1'b0,
-							  registers[`REG_F][3:0]
-							};
-					end
-					`INSN_alu_SUB: begin
-						registers[`REG_A] <=
-							registers[`REG_A] - tmp;
-						registers[`REG_F] <=
-							{ /* Z */ ((registers[`REG_A] - tmp) == 0) ? 1'b1 : 1'b0,
-							  /* N */ 1'b1,
-							  /* H */ (({1'b0,registers[`REG_A][3:0]} - {1'b0,tmp[3:0]}) >> 4 == 1) ? 1'b1 : 1'b0,
-							  /* C */ (({1'b0,registers[`REG_A]} - {1'b0,tmp}) >> 8 == 1) ? 1'b1 : 1'b0,
-							  registers[`REG_F][3:0]
-							};
-					end
-					`INSN_alu_SBC: begin
-						registers[`REG_A] <=
-							registers[`REG_A] - (tmp + {7'b0,registers[`REG_F][4]});
-						registers[`REG_F] <=
-							{ /* Z */ ((registers[`REG_A] - (tmp + {7'b0,registers[`REG_F][4]})) == 0) ? 1'b1 : 1'b0,
-							  /* N */ 1'b1,
-							  /* H */ (({1'b0,registers[`REG_A][3:0]} - ({1'b0,tmp[3:0]} + {4'b0,registers[`REG_F][4]})) >> 4 == 1) ? 1'b1 : 1'b0,
-							  /* C */ (({1'b0,registers[`REG_A]} - ({1'b0,tmp} + {8'b0,registers[`REG_F][4]})) >> 8 == 1) ? 1'b1 : 1'b0,
-							  registers[`REG_F][3:0]
-							};
-					end
-					`INSN_alu_AND: begin
-						registers[`REG_A] <=
-							registers[`REG_A] & tmp;
-						registers[`REG_F] <=
-							{ /* Z */ ((registers[`REG_A] & tmp) == 0) ? 1'b1 : 1'b0,
-							  3'b010,
-							  registers[`REG_F][3:0]
-							};
-					end
-					`INSN_alu_OR: begin
-						registers[`REG_A] <=
-							registers[`REG_A] | tmp;
-						registers[`REG_F] <=
-							{ /* Z */ ((registers[`REG_A] | tmp) == 0) ? 1'b1 : 1'b0,
-							  3'b000,
-							  registers[`REG_F][3:0]
-							};
-					end
-					`INSN_alu_XOR: begin
-						registers[`REG_A] <=
-							registers[`REG_A] ^ tmp;
-						registers[`REG_F] <=
-							{ /* Z */ ((registers[`REG_A] ^ tmp) == 0) ? 1'b1 : 1'b0,
-							  3'b000,
-							  registers[`REG_F][3:0]
-							};
-					end
-					`INSN_alu_CP: begin
-						registers[`REG_F] <=
-							{ /* Z */ ((registers[`REG_A] - tmp) == 0) ? 1'b1 : 1'b0,
-							  /* N */ 1'b1,
-							  /* H */ (({1'b0,registers[`REG_A][3:0]} - {1'b0,tmp[3:0]}) >> 4 == 1) ? 1'b1 : 1'b0,
-							  /* C */ (({1'b0,registers[`REG_A]} - {1'b0,tmp}) >> 8 == 1) ? 1'b1 : 1'b0,
-							  registers[`REG_F][3:0]
-							};
-					end
-					default:
-						$stop;
-					endcase
-				end
-			end
-			`INSN_ALU_A: begin
-				case(opcode[5:3])
-				`INSN_alu_RLCA: begin
-					registers[`REG_A] <= {registers[`REG_A][6:0],registers[`REG_A][7]};
-					registers[`REG_F] <= {registers[`REG_F][7:5],registers[`REG_A][7],registers[`REG_F][3:0]};
-				end
-				`INSN_alu_RRCA: begin
-					registers[`REG_A] <= {registers[`REG_A][0],registers[`REG_A][7:1]};
-					registers[`REG_F] <= {registers[`REG_F][7:5],registers[`REG_A][0],registers[`REG_F][3:0]};
-				end
-				`INSN_alu_RLA: begin
-					registers[`REG_A] <= {registers[`REG_A][6:0],registers[`REG_F][4]};
-					registers[`REG_F] <= {registers[`REG_F][7:5],registers[`REG_A][7],registers[`REG_F][3:0]};
-				end
-				`INSN_alu_RRA: begin
-					registers[`REG_A] <= {registers[`REG_A][4],registers[`REG_A][7:1]};
-					registers[`REG_F] <= {registers[`REG_F][7:5],registers[`REG_A][0],registers[`REG_F][3:0]};
-				end
-				`INSN_alu_CPL: begin
-					registers[`REG_A] <= ~registers[`REG_A];
-					registers[`REG_F] <= {registers[`REG_F][7],1'b1,1'b1,registers[`REG_F][4:0]};
-				end
-				`INSN_alu_SCF: begin
-					registers[`REG_F] <= {registers[`REG_F][7:5],1'b1,registers[`REG_F][3:0]};
-				end
-				`INSN_alu_CCF: begin
-					registers[`REG_F] <= {registers[`REG_F][7:5],~registers[`REG_F][4],registers[`REG_F][3:0]};
-				end
-				endcase
-			end
-			`INSN_NOP: begin /* NOP! */ end
 			`INSN_RST: begin
 				case (cycle)
 				0:	begin /* type F */ end
diff --git a/allinsns.v b/allinsns.v
index 7e92cd3..79d88aa 100644
--- a/allinsns.v
+++ b/allinsns.v
@@ -7,3 +7,8 @@
 `include "insn_ld_sp_hl.v"
 `include "insn_push_reg.v"
 `include "insn_pop_reg.v"
+`include "insn_ldh_ac.v"
+`include "insn_ldx_ahl.v"
+`include "insn_alu8.v"
+`include "insn_alu_a.v"
+`include "insn_nop.v"
diff --git a/insn_alu8.v b/insn_alu8.v
new file mode 100644
index 0000000..8470e27
--- /dev/null
+++ b/insn_alu8.v
@@ -0,0 +1,115 @@
+`ifdef EXECUTE
+	`INSN_ALU8: begin
+		if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 0)) begin
+			// fffffffff fuck your shit, read from (HL) :(
+			rd <= 1;
+			address <= {registers[`REG_H], registers[`REG_L]};
+		end else begin
+			`EXEC_NEWCYCLE;
+			`EXEC_INC_PC;
+			case (opcode[2:0])
+			`INSN_reg_A:	tmp <= registers[`REG_A];
+			`INSN_reg_B:	tmp <= registers[`REG_B];
+			`INSN_reg_C:	tmp <= registers[`REG_C];
+			`INSN_reg_D:	tmp <= registers[`REG_D];
+			`INSN_reg_E:	tmp <= registers[`REG_E];
+			`INSN_reg_H:	tmp <= registers[`REG_H];
+			`INSN_reg_L:	tmp <= registers[`REG_L];
+			`INSN_reg_dHL:	tmp <= rdata;
+			endcase
+		end
+	end
+`endif
+
+`ifdef WRITEBACK
+	`INSN_ALU8: begin
+		if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 0)) begin
+			/* Sit on our asses. */
+		end else begin		/* Actually do the computation! */
+			case (opcode[5:3])
+			`INSN_alu_ADD: begin
+				registers[`REG_A] <=
+					registers[`REG_A] + tmp;
+				registers[`REG_F] <=
+					{ /* Z */ ((registers[`REG_A] + tmp) == 0) ? 1'b1 : 1'b0,
+					  /* N */ 1'b0,
+					  /* H */ (({1'b0,registers[`REG_A][3:0]} + {1'b0,tmp[3:0]}) >> 4 == 1) ? 1'b1 : 1'b0,
+					  /* C */ (({1'b0,registers[`REG_A]} + {1'b0,tmp}) >> 8 == 1) ? 1'b1 : 1'b0,
+					  registers[`REG_F][3:0]
+					};
+			end
+			`INSN_alu_ADC: begin
+				registers[`REG_A] <=
+					registers[`REG_A] + tmp + {7'b0,registers[`REG_F][4]};
+				registers[`REG_F] <=
+					{ /* Z */ ((registers[`REG_A] + tmp + {7'b0,registers[`REG_F][4]}) == 0) ? 1'b1 : 1'b0,
+					  /* N */ 1'b0,
+					  /* H */ (({1'b0,registers[`REG_A][3:0]} + {1'b0,tmp[3:0]} + {4'b0,registers[`REG_F][4]}) >> 4 == 1) ? 1'b1 : 1'b0,
+					  /* C */ (({1'b0,registers[`REG_A]} + {1'b0,tmp} + {8'b0,registers[`REG_F][4]}) >> 8 == 1) ? 1'b1 : 1'b0,
+					  registers[`REG_F][3:0]
+					};
+			end
+			`INSN_alu_SUB: begin
+				registers[`REG_A] <=
+					registers[`REG_A] - tmp;
+				registers[`REG_F] <=
+					{ /* Z */ ((registers[`REG_A] - tmp) == 0) ? 1'b1 : 1'b0,
+					  /* N */ 1'b1,
+					  /* H */ (({1'b0,registers[`REG_A][3:0]} - {1'b0,tmp[3:0]}) >> 4 == 1) ? 1'b1 : 1'b0,
+					  /* C */ (({1'b0,registers[`REG_A]} - {1'b0,tmp}) >> 8 == 1) ? 1'b1 : 1'b0,
+					  registers[`REG_F][3:0]
+					};
+			end
+			`INSN_alu_SBC: begin
+				registers[`REG_A] <=
+					registers[`REG_A] - (tmp + {7'b0,registers[`REG_F][4]});
+				registers[`REG_F] <=
+					{ /* Z */ ((registers[`REG_A] - (tmp + {7'b0,registers[`REG_F][4]})) == 0) ? 1'b1 : 1'b0,
+					  /* N */ 1'b1,
+					  /* H */ (({1'b0,registers[`REG_A][3:0]} - ({1'b0,tmp[3:0]} + {4'b0,registers[`REG_F][4]})) >> 4 == 1) ? 1'b1 : 1'b0,
+					  /* C */ (({1'b0,registers[`REG_A]} - ({1'b0,tmp} + {8'b0,registers[`REG_F][4]})) >> 8 == 1) ? 1'b1 : 1'b0,
+					  registers[`REG_F][3:0]
+					};
+			end
+			`INSN_alu_AND: begin
+				registers[`REG_A] <=
+					registers[`REG_A] & tmp;
+				registers[`REG_F] <=
+					{ /* Z */ ((registers[`REG_A] & tmp) == 0) ? 1'b1 : 1'b0,
+					  3'b010,
+					  registers[`REG_F][3:0]
+					};
+			end
+			`INSN_alu_OR: begin
+				registers[`REG_A] <=
+					registers[`REG_A] | tmp;
+				registers[`REG_F] <=
+					{ /* Z */ ((registers[`REG_A] | tmp) == 0) ? 1'b1 : 1'b0,
+					  3'b000,
+					  registers[`REG_F][3:0]
+					};
+			end
+			`INSN_alu_XOR: begin
+				registers[`REG_A] <=
+					registers[`REG_A] ^ tmp;
+				registers[`REG_F] <=
+					{ /* Z */ ((registers[`REG_A] ^ tmp) == 0) ? 1'b1 : 1'b0,
+					  3'b000,
+					  registers[`REG_F][3:0]
+					};
+			end
+			`INSN_alu_CP: begin
+				registers[`REG_F] <=
+					{ /* Z */ ((registers[`REG_A] - tmp) == 0) ? 1'b1 : 1'b0,
+					  /* N */ 1'b1,
+					  /* H */ (({1'b0,registers[`REG_A][3:0]} - {1'b0,tmp[3:0]}) >> 4 == 1) ? 1'b1 : 1'b0,
+					  /* C */ (({1'b0,registers[`REG_A]} - {1'b0,tmp}) >> 8 == 1) ? 1'b1 : 1'b0,
+					  registers[`REG_F][3:0]
+					};
+			end
+			default:
+				$stop;
+			endcase
+		end
+	end
+`endif
diff --git a/insn_alu_a.v b/insn_alu_a.v
new file mode 100644
index 0000000..fe3315a
--- /dev/null
+++ b/insn_alu_a.v
@@ -0,0 +1,39 @@
+`ifdef EXECUTE
+	`INSN_ALU_A: begin
+		`EXEC_NEWCYCLE;
+		`EXEC_INC_PC;
+	end
+`endif
+
+`ifdef WRITEBACK
+	`INSN_ALU_A: begin
+		case(opcode[5:3])
+		`INSN_alu_RLCA: begin
+			registers[`REG_A] <= {registers[`REG_A][6:0],registers[`REG_A][7]};
+			registers[`REG_F] <= {registers[`REG_F][7:5],registers[`REG_A][7],registers[`REG_F][3:0]};
+		end
+		`INSN_alu_RRCA: begin
+			registers[`REG_A] <= {registers[`REG_A][0],registers[`REG_A][7:1]};
+			registers[`REG_F] <= {registers[`REG_F][7:5],registers[`REG_A][0],registers[`REG_F][3:0]};
+		end
+		`INSN_alu_RLA: begin
+			registers[`REG_A] <= {registers[`REG_A][6:0],registers[`REG_F][4]};
+			registers[`REG_F] <= {registers[`REG_F][7:5],registers[`REG_A][7],registers[`REG_F][3:0]};
+		end
+		`INSN_alu_RRA: begin
+			registers[`REG_A] <= {registers[`REG_A][4],registers[`REG_A][7:1]};
+			registers[`REG_F] <= {registers[`REG_F][7:5],registers[`REG_A][0],registers[`REG_F][3:0]};
+		end
+		`INSN_alu_CPL: begin
+			registers[`REG_A] <= ~registers[`REG_A];
+			registers[`REG_F] <= {registers[`REG_F][7],1'b1,1'b1,registers[`REG_F][4:0]};
+		end
+		`INSN_alu_SCF: begin
+			registers[`REG_F] <= {registers[`REG_F][7:5],1'b1,registers[`REG_F][3:0]};
+		end
+		`INSN_alu_CCF: begin
+			registers[`REG_F] <= {registers[`REG_F][7:5],~registers[`REG_F][4],registers[`REG_F][3:0]};
+		end
+		endcase
+	end
+`endif
diff --git a/insn_ldh_ac.v b/insn_ldh_ac.v
new file mode 100644
index 0000000..146f10b
--- /dev/null
+++ b/insn_ldh_ac.v
@@ -0,0 +1,30 @@
+`ifdef EXECUTE
+	`INSN_LDH_AC: begin
+		case (cycle)
+		0:	begin
+				address <= {8'hFF,registers[`REG_C]};
+				if (opcode[4]) begin	// LD A,(C)
+					rd <= 1;
+				end else begin
+					wr <= 1;
+					wdata <= registers[`REG_A];
+				end
+			end
+		1:	begin
+				`EXEC_NEWCYCLE;
+				`EXEC_INC_PC;
+			end
+		endcase
+	end
+`endif
+
+`ifdef WRITEBACK
+	`INSN_LDH_AC: begin
+		case (cycle)
+		0:	begin /* Type F */ end
+		1:	if (opcode[4])
+				registers[`REG_A] <= rdata;
+		endcase
+	end
+`endif
+
diff --git a/insn_ldx_ahl.v b/insn_ldx_ahl.v
new file mode 100644
index 0000000..a16d6ba
--- /dev/null
+++ b/insn_ldx_ahl.v
@@ -0,0 +1,35 @@
+`ifdef EXECUTE
+	`INSN_LDx_AHL: begin
+		case (cycle)
+		0:	begin
+				address <= {registers[`REG_H],registers[`REG_L]};
+				if (opcode[3]) begin	// LDx A, (HL)
+					rd <= 1;
+				end else begin
+					wr <= 1;
+					wdata <= registers[`REG_A];
+				end
+			end
+		1:	begin
+				`EXEC_NEWCYCLE;
+				`EXEC_INC_PC;
+			end
+		endcase
+	end
+`endif
+
+`ifdef WRITEBACK
+	`INSN_LDx_AHL: begin
+		case (cycle)
+		0:	begin /* Type F */ end
+		1:	begin
+				if (opcode[3])
+					registers[`REG_A] <= rdata;
+				{registers[`REG_H],registers[`REG_L]} <=
+					opcode[4] ? // if set, LDD, else LDI
+					({registers[`REG_H],registers[`REG_L]} - 1) :
+					({registers[`REG_H],registers[`REG_L]} + 1);
+			end
+		endcase
+	end
+`endif
diff --git a/insn_nop.v b/insn_nop.v
new file mode 100644
index 0000000..2772a11
--- /dev/null
+++ b/insn_nop.v
@@ -0,0 +1,10 @@
+`ifdef EXECUTE
+	`INSN_NOP: begin
+		`EXEC_NEWCYCLE;
+		`EXEC_INC_PC;
+	end
+`endif
+
+`ifdef WRITEBACK
+	`INSN_NOP: begin end
+`endif