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module constmuldivmod(input [7:0] A, input [5:0] mode, output reg [7:0] Y);
always @* begin
case (mode)
0: Y = A / 8'd0;
1: Y = A % 8'd0;
2: Y = A * 8'd0;
3: Y = A / 8'd1;
4: Y = A % 8'd1;
5: Y = A * 8'd1;
6: Y = A / 8'd2;
7: Y = A % 8'd2;
8: Y = A * 8'd2;
9: Y = A / 8'd4;
10: Y = A % 8'd4;
11: Y = A * 8'd4;
12: Y = A / 8'd8;
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
endmodule
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