improved the speed somewhat

fixed bug with negative chars in comparisons

lang/cem/libcc.ansi/string/memcmp.c

@@ -11,10 +11,12 @@ memcmp(const void *s1, const void *s2, size_t n)
 {
 	register const char *p1 = s1, *p2 = s2;
 
-	while (n > 0) {
-		n--;
-		if (*p1++ != *p2++)
+	if (n) {
+		n++;
+		while (--n > 0) {
+			if (*p1++ == *p2++) continue;
 			return *--p1 - *--p2;
+		}
 	}
 	return 0;
 }