-module constmuldivmod(input [7:0] A, input [2:0] mode, output reg [7:0] Y);
+module constmuldivmod(input [7:0] A, input [5:0] mode, output reg [7:0] Y);
always @* begin
case (mode)
0: Y = A / 8'd0;
13: Y = A % 8'd8;
14: Y = A * 8'd8;
+ 15: Y = $signed(A) / $signed(8'd0);
+ 16: Y = $signed(A) % $signed(8'd0);
+ 17: Y = $signed(A) * $signed(8'd0);
+
+ 18: Y = $signed(A) / $signed(8'd1);
+ 19: Y = $signed(A) % $signed(8'd1);
+ 20: Y = $signed(A) * $signed(8'd1);
+
+ 21: Y = $signed(A) / $signed(8'd2);
+ 22: Y = $signed(A) % $signed(8'd2);
+ 23: Y = $signed(A) * $signed(8'd2);
+
+ 24: Y = $signed(A) / $signed(8'd4);
+ 25: Y = $signed(A) % $signed(8'd4);
+ 26: Y = $signed(A) * $signed(8'd4);
+
+ 27: Y = $signed(A) / $signed(8'd8);
+ 28: Y = $signed(A) % $signed(8'd8);
+ 29: Y = $signed(A) * $signed(8'd8);
+
+ 30: Y = $signed(A) / $signed(-8'd0);
+ 31: Y = $signed(A) % $signed(-8'd0);
+ 32: Y = $signed(A) * $signed(-8'd0);
+
+ 33: Y = $signed(A) / $signed(-8'd1);
+ 34: Y = $signed(A) % $signed(-8'd1);
+ 35: Y = $signed(A) * $signed(-8'd1);
+
+ 36: Y = $signed(A) / $signed(-8'd2);
+ 37: Y = $signed(A) % $signed(-8'd2);
+ 38: Y = $signed(A) * $signed(-8'd2);
+
+ 39: Y = $signed(A) / $signed(-8'd4);
+ 40: Y = $signed(A) % $signed(-8'd4);
+ 41: Y = $signed(A) * $signed(-8'd4);
+
+ 42: Y = $signed(A) / $signed(-8'd8);
+ 43: Y = $signed(A) % $signed(-8'd8);
+ 44: Y = $signed(A) * $signed(-8'd8);
+
default: Y = 8'd16 * A;
endcase
end