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module optest(clk, mode, u1, s1, u2, s2, y);
input clk;
input [6:0] mode;
input [3:0] u1, u2;
input signed [3:0] s1, s2;
output reg [7:0] y;
always @(posedge clk) begin
y <= 8'h42;
case (mode)
0: y <= u1 << u2;
1: y <= u1 << s2;
2: y <= s1 << u2;
3: y <= s1 << s2;
4: y <= u1 >> u2;
5: y <= u1 >> s2;
6: y <= s1 >> u2;
7: y <= s1 >> s2;
8: y <= u1 <<< u2;
9: y <= u1 <<< s2;
10: y <= s1 <<< u2;
11: y <= s1 <<< s2;
12: y <= u1 >>> u2;
13: y <= u1 >>> s2;
14: y <= s1 >>> u2;
15: y <= s1 >>> s2;
16: y <= u1 < u2;
17: y <= u1 < s2;
18: y <= s1 < u2;
19: y <= s1 < s2;
20: y <= u1 <= u2;
21: y <= u1 <= s2;
22: y <= s1 <= u2;
23: y <= s1 <= s2;
24: y <= u1 == u2;
25: y <= u1 == s2;
26: y <= s1 == u2;
27: y <= s1 == s2;
28: y <= u1 != u2;
29: y <= u1 != s2;
30: y <= s1 != u2;
31: y <= s1 != s2;
32: y <= u1 >= u2;
33: y <= u1 >= s2;
34: y <= s1 >= u2;
35: y <= s1 >= s2;
36: y <= u1 > u2;
37: y <= u1 > s2;
38: y <= s1 > u2;
39: y <= s1 > s2;
40: y <= u1 + u2;
41: y <= u1 + s2;
42: y <= s1 + u2;
43: y <= s1 + s2;
44: y <= u1 - u2;
45: y <= u1 - s2;
46: y <= s1 - u2;
47: y <= s1 - s2;
48: y <= u1 * u2;
49: y <= u1 * s2;
50: y <= s1 * u2;
51: y <= s1 * s2;
52: y <= u1 / u2;
53: y <= u1 / s2;
54: y <= s1 / u2;
55: y <= s1 / s2;
56: y <= u1 % u2;
57: y <= u1 % s2;
58: y <= s1 % u2;
59: y <= s1 % s2;
60: y <= 4'd2 ** u1;
61: y <= 4'd2 ** s1;
62: y <= 4'sd2 ** u1;
63: y <= 4'sd2 ** s1;
64: y <= +u1;
65: y <= -u1;
66: y <= ~u1;
67: y <= !u1;
68: y <= +s1;
69: y <= -s1;
70: y <= ~s1;
71: y <= !s1;
72: y <= { &u1, ~&u1, |u1, ~|u1, ^u1, ~^u1, ^~u1 };
73: y <= { &s1, ~&s1, |s1, ~|s1, ^s1, ~^s1, ^~s1 };
74: y <= { &u1[1:0], ~&u1[1:0], |u1[1:0], ~|u1[1:0], ^u1[1:0], ~^u1[1:0], ^~u1[1:0] };
75: y <= { &s1[1:0], ~&s1[1:0], |s1[1:0], ~|s1[1:0], ^s1[1:0], ~^s1[1:0], ^~s1[1:0] };
76: y <= { u1[1:0] && u2[1:0], u1[1:0] && u2[1:0], !u1[1:0] };
77: y <= {4{u1[1:0]}};
78: y <= {u1, u2} ^ {s1, s2};
79: y <= {u1, u2} & {s1, s2};
80: y <= u1[0] ? u1 : u2;
81: y <= u1[0] ? u1 : s2;
82: y <= u1[0] ? s1 : u2;
83: y <= u1[0] ? s1 : s2;
endcase
end
endmodule
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