From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Fri, 28 Mar 2008 06:13:07 +0000 (-0400)
Subject: Use the new shnasto
X-Git-Tag: PRE_ROLLBACK
X-Git-Url: http://git.joshuawise.com/mandelfpga.git/commitdiff_plain/7af9813c1d9279fad20ebad595348c8a665c4967?hp=ec33b70849f3da7dfbf2ccc0ef434ea1a63f9041

Use the new shnasto
---

diff --git a/Main.v b/Main.v
index a5dc200..0eba781 100644
--- 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;