X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/77ab69d7bb0902e6ebf0994159ed2205f8413e34..b057a5d6e6db6db06ae33703ca72cd235eec91d6:/core/insn_incdec_reg8.v

diff --git a/core/insn_incdec_reg8.v b/core/insn_incdec_reg8.v
new file mode 100644
index 0000000..58582b6
--- /dev/null
+++ b/core/insn_incdec_reg8.v
@@ -0,0 +1,34 @@
+`ifdef EXECUTE
+	`INSN_INCDEC_reg8: begin
+		`EXEC_INC_PC
+		`EXEC_NEWCYCLE
+		case (opcode[5:3])
+		`INSN_reg_A:	tmp <= `_A;
+		`INSN_reg_B:	tmp <= `_B;
+		`INSN_reg_C:	tmp <= `_C;
+		`INSN_reg_D:	tmp <= `_D;
+		`INSN_reg_E:	tmp <= `_E;
+		`INSN_reg_H:	tmp <= `_H;
+		`INSN_reg_L:	tmp <= `_L;
+		endcase
+	end
+`endif
+
+`ifdef WRITEBACK
+	`INSN_INCDEC_reg8: begin
+		case (opcode[5:3])
+		`INSN_reg_A:	`_A <= tmp + (opcode[0] ? 8'hFF : 8'h01);
+		`INSN_reg_B:	`_B <= tmp + (opcode[0] ? 8'hFF : 8'h01);
+		`INSN_reg_C:	`_C <= tmp + (opcode[0] ? 8'hFF : 8'h01);
+		`INSN_reg_D:	`_D <= tmp + (opcode[0] ? 8'hFF : 8'h01);
+		`INSN_reg_E:	`_E <= tmp + (opcode[0] ? 8'hFF : 8'h01);
+		`INSN_reg_H:	`_H <= tmp + (opcode[0] ? 8'hFF : 8'h01);
+		`INSN_reg_L:	`_L <= tmp + (opcode[0] ? 8'hFF : 8'h01);
+		endcase
+		`_F <= {
+				((tmp + (opcode[0] ? 8'hFF : 8'h01)) == 8'h00) ? 1'b1 : 1'b0,
+				1'b0,
+				(({1'b0,tmp[3:0]} + (opcode[0] ? 5'h1F : 5'h01)) >> 4) ? 1'b1 : 1'b0,
+				`_F[4:0]};
+	end
+`endif