proc_mux: add src test

tests/proc/proc_mux_src.v

@@ -0,0 +1,92 @@
+module nested(
+	input clk,
+	input [7:0] A,
+	input [7:0] B,
+	input [3:0] mode1,
+	input [3:0] mode2,
+	output reg [7:0] result1,
+	output reg [7:0] result2,
+	output reg [1:0] arith
+);
+
+	localparam OP_A = 4'b0000;
+	localparam OP_BA = 4'b0001;
+	localparam OP_BB = 4'b0010;
+	localparam OP_C = 4'b0011;
+
+	always @(posedge clk)
+	begin
+		case (mode1)
+			OP_A: begin
+				result1 = A + B;
+				result2 = A - B;
+				arith = 2'b01;
+			end
+			OP_BA , OP_BB : begin
+				result1 = A * B;
+				result2 = A / B;
+				arith = 2'b00;
+			end
+			OP_C : begin
+				arith = 2'b10;
+				case (mode2)
+					OP_A: begin
+						result1 = ~B;
+						result2 = B;
+					end
+					OP_C: begin
+						result1 = A ^ B;
+						result2 = A == B;
+					end
+					default: begin
+						result1 = 1'b0;
+						// result2 omitted
+					end
+				endcase
+			end
+			default: begin
+				result1 = 8'b0;
+				result2 = 8'b0;
+				arith = 2'b11;
+			end
+		endcase
+	end
+endmodule
+
+module tiny(
+	input clk,
+	input ya,
+	input [7:0] in,
+	output reg [7:0] out,
+);
+	always @(posedge clk)
+	begin
+		case (ya)
+			1'b1: begin
+				out = in;
+			end
+		endcase
+	end
+endmodule
+
+module tiny2(
+	input clk,
+	input [1:0] ya,
+	input [7:0] in,
+	output reg [7:0] out,
+);
+	always @(posedge clk)
+	begin
+		case (ya)
+			2'b01: begin
+				out = in;
+			end
+			2'b10: begin
+				out = 1'b1;
+			end
+			default begin
+				out = 1'b0;
+			end
+		endcase
+	end
+endmodule