/* Split a double into fraction and mantissa.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007-2008 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Paolo Bonzini <bonzini@gnu.org>, 2003, and
Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
-#if !(defined USE_LONG_DOUBLE && !HAVE_LONG_DOUBLE)
-
/* Specification. */
-# include <math.h>
+#include <math.h>
-# include <float.h>
-# ifdef USE_LONG_DOUBLE
-# include "isnanl-nolibm.h"
-# else
-# include "isnan.h"
-# endif
+#include <float.h>
+#ifdef USE_LONG_DOUBLE
+# include "isnanl-nolibm.h"
+# include "fpucw.h"
+#else
+# include "isnand-nolibm.h"
+#endif
/* This file assumes FLT_RADIX = 2. If FLT_RADIX is a power of 2 greater
than 2, or not even a power of 2, some rounding errors can occur, so that
then the returned mantissa is only guaranteed to be <= 1.0, not < 1.0. */
-# ifdef USE_LONG_DOUBLE
-# define FUNC frexpl
-# define DOUBLE long double
-# define ISNAN isnanl
-# define L_(literal) literal##L
-# else
-# define FUNC frexp
-# define DOUBLE double
-# define ISNAN isnan
-# define L_(literal) literal
-# endif
+#ifdef USE_LONG_DOUBLE
+# define FUNC frexpl
+# define DOUBLE long double
+# define ISNAN isnanl
+# define DECL_ROUNDING DECL_LONG_DOUBLE_ROUNDING
+# define BEGIN_ROUNDING() BEGIN_LONG_DOUBLE_ROUNDING ()
+# define END_ROUNDING() END_LONG_DOUBLE_ROUNDING ()
+# define L_(literal) literal##L
+#else
+# define FUNC frexp
+# define DOUBLE double
+# define ISNAN isnand
+# define DECL_ROUNDING
+# define BEGIN_ROUNDING()
+# define END_ROUNDING()
+# define L_(literal) literal
+#endif
DOUBLE
-FUNC (DOUBLE x, int *exp)
+FUNC (DOUBLE x, int *expptr)
{
int sign;
int exponent;
+ DECL_ROUNDING
/* Test for NaN, infinity, and zero. */
if (ISNAN (x) || x + x == x)
{
- *exp = 0;
+ *expptr = 0;
return x;
}
sign = -1;
}
+ BEGIN_ROUNDING ();
+
{
/* Since the exponent is an 'int', it fits in 64 bits. Therefore the
loops are executed no more than 64 times. */
/* Here 0.5 <= x < 1.0. */
}
- *exp = exponent;
- return (sign < 0 ? - x : x);
-}
-
-#else
+ if (sign < 0)
+ x = - x;
-/* This declaration is solely to ensure that after preprocessing
- this file is never empty. */
-typedef int dummy;
+ END_ROUNDING ();
-#endif
+ *expptr = exponent;
+ return x;
+}