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/********************************************************************\
* pow.h -- pow wrapper for MinGW systems *
* Copyright (C) 2007 Andreas Koehler <andi5.py@gmx.net> *
* *
* 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 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, contact: *
* *
* Free Software Foundation Voice: +1-617-542-5942 *
* 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652 *
* Boston, MA 02110-1301, USA gnu@gnu.org *
\********************************************************************/
#ifndef __POW_H__
#define __POW_H__
#include <math.h>
/* From MinGW, math.h: */
/* Excess precision when using a 64-bit mantissa for FPU math ops can
* cause unexpected results with some of the MSVCRT math functions.
* For example, unless the function return value is stored (truncating
* to 53-bit mantissa), calls to pow with both x and y as integral
* values sometimes produce a non-integral result. */
#define __DEFINE_FLOAT_STORE_MATHFN_D1(fn1) \
static __inline__ double \
__float_store_ ## fn1 (double x) \
{ \
__volatile__ double res = (fn1) (x); \
return res; \
}
#define __DEFINE_FLOAT_STORE_MATHFN_D2(fn2) \
static __inline__ double \
__float_store_ ## fn2 (double x, double y) \
{ \
__volatile__ double res = (fn2) (x, y); \
return res; \
}
#undef pow
/* Define the ___float_store_pow function and use it instead of pow(). */
__DEFINE_FLOAT_STORE_MATHFN_D2 (pow)
#define pow __float_store_pow
#endif /* __POW_H__ */
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