techmap: Fix using overwritten results in Kogge-Stone

techlibs/common/choices/kogge-stone.v

@@ -42,7 +42,7 @@ module _80_lcu_kogge_stone (P, G, CI, CO);
 		g[0] = g[0] | (p[0] & CI);
 
 		for (i = 0; i < $clog2(WIDTH); i = i + 1) begin
-			for (j = 2**i; j < WIDTH; j = j + 1) begin
+			for (j = WIDTH - 1; j >= 2**i; j = j - 1) begin
 				g[j] = g[j] | p[j] & g[j - 2**i];
 				p[j] = p[j] & p[j - 2**i];
 			end