Use the new shnasto

[mandelfpga.git] / Main.v

diff --git a/Main.v b/Main.v
index a5dc200a4eb0c8bdee5d7020bfc5a2fa8f0b6f46..0eba7810d28e361596be07a9696df1384e455111 100644 (file)
--- a/Main.v
+++ b/Main.v
@@ -131,8 +131,36 @@ module MandelUnit(
        Multiplier i2m(clk, i[12:0], i[12:0], isign, isign, i2[12:0], i2sign, i2[13]);
        Multiplier rim(clk, r[12:0], i[12:0], rsign, isign, ri[13:1], risign, ri[14]);
 
-       assign bigsum = r2[12:0] + i2[12:0];
-       assign bigsum_ovf = bigsum[13] | r2[13] | i2[13];
+       //assign bigsum = r2[12:0] + i2[12:0];
+       //wire shnasto = bigsum[13];
+       wire shnasto =          // o shi
+               ((r[12] & i[12]) |
+               ((r[12] ^ i[12]) &
+               ((r[11] & i[11]) |
+               ((r[11] ^ i[11]) &
+               ((r[10] & i[10]) |
+               ((r[10] ^ i[10]) &
+               ((r[ 9] & i[ 9]) |
+               ((r[ 9] ^ i[ 9]) &
+               ((r[ 8] & i[ 8]) |
+               ((r[ 8] ^ i[ 8]) &
+               ((r[ 7] & i[ 7]) |
+               ((r[ 7] ^ i[ 7]) &
+               ((r[ 6] & i[ 6]) |
+               ((r[ 6] ^ i[ 6]) &
+               ((r[ 5] & i[ 5]) |
+               ((r[ 5] ^ i[ 5]) &
+               ((r[ 4] & i[ 4]) |
+               ((r[ 4] ^ i[ 4]) &
+               ((r[ 3] & i[ 3]) |
+               ((r[ 3] ^ i[ 3]) &
+               ((r[ 2] & i[ 2]) |
+               ((r[ 2] ^ i[ 2]) &
+               ((r[ 1] & i[ 1]) |
+               ((r[ 1] ^ i[ 1]) &
+                (r[ 0] & i[ 0])
+               ))))))))))))))))))))))));
+       assign bigsum_ovf = shnasto | r2[13] | i2[13];
        
        assign twocdiff = r2 - i2;
        assign diff = twocdiff[15] ? -twocdiff : twocdiff;