/* Primitive operations on floating point for GNU Emacs Lisp interpreter.
Copyright (C) 1988, 1993, 1994, 1999, 2002, 2003, 2004,
- 2005 Free Software Foundation, Inc.
+ 2005, 2006 Free Software Foundation, Inc.
This file is part of GNU Emacs.
CHECK_NUMBER_OR_FLOAT (arg1);
CHECK_NUMBER_OR_FLOAT (arg2);
if (INTEGERP (arg1) /* common lisp spec */
- && INTEGERP (arg2)) /* don't promote, if both are ints */
+ && INTEGERP (arg2) /* don't promote, if both are ints, and */
+ && 0 <= XINT (arg2)) /* we are sure the result is not fractional */
{ /* this can be improved by pre-calculating */
EMACS_INT acc, x, y; /* some binary powers of x then accumulating */
Lisp_Object val;
DEFUN ("log", Flog, Slog, 1, 2, 0,
doc: /* Return the natural logarithm of ARG.
-If second optional argument BASE is given, return log ARG using that base. */)
+If the optional argument BASE is given, return log ARG using that base. */)
(arg, base)
register Lisp_Object arg, base;
{