module test(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 <= +u1; 61: y <= -u1; 62: y <= ~u1; 63: y <= !u1; 64: y <= +s1; 65: y <= -s1; 66: y <= ~s1; 67: y <= !s1; 68: y <= { &u1, ~&u1, |u1, ~|u1, ^u1, ~^u1, ^~u1 }; 69: y <= { &s1, ~&s1, |s1, ~|s1, ^s1, ~^s1, ^~s1 }; 70: y <= { &u1[1:0], ~&u1[1:0], |u1[1:0], ~|u1[1:0], ^u1[1:0], ~^u1[1:0], ^~u1[1:0] }; 71: y <= { &s1[1:0], ~&s1[1:0], |s1[1:0], ~|s1[1:0], ^s1[1:0], ~^s1[1:0], ^~s1[1:0] }; 72: y <= { u1[1:0] && u2[1:0], u1[1:0] && u2[1:0], !u1[1:0] }; 73: y <= {4{u1[1:0]}}; 74: y <= {u1, u2} ^ {s1, s2}; 75: y <= {u1, u2} & {s1, s2}; 76: y <= u1[0] ? u1 : u2; 77: y <= u1[0] ? u1 : s2; 78: y <= u1[0] ? s1 : u2; 79: y <= u1[0] ? s1 : s2; endcase end endmodule