long_from_binary_base(): Sped this a little by computing the # of bits

needed outside the first loop.

Objects/longobject.c

@@ -1126,15 +1126,15 @@ long_from_binary_base(char **str, int base)
 			k = ch - 'A' + 10;
 		if (k < 0 || k >= base)
 			break;
-		n += bits_per_char;
-		if (n < 0) {
+		++p;
+	}
+	*str = p;
+	n = (p - start) * bits_per_char;
+	if (n / bits_per_char != p - start) {
 		PyErr_SetString(PyExc_ValueError,
 				"long string too large to convert");
 		return NULL;
 	}
-		++p;
-	}
-	*str = p;
 	/* n <- # of Python digits needed, = ceiling(n/SHIFT). */
 	n = (n + SHIFT - 1) / SHIFT;
 	z = _PyLong_New(n);