[thirdparty/glibc.git] / math / w_pow_template.c

/* Wrapper to set errno for pow.
   Copyright (C) 2017-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

/* Only build wrappers from the templates for the types that define the macro
   below.  This macro is set in math-type-macros-<type>.h in sysdeps/generic
   for each floating-point type.  */
#if __USE_WRAPPER_TEMPLATE

# include <errno.h>
# include <fenv.h>
# include <math.h>
# include <math_private.h>

FLOAT
M_DECL_FUNC (__pow) (FLOAT x, FLOAT y)
{
  FLOAT z = M_SUF (__ieee754_pow) (x, y);
  if (__glibc_unlikely (!isfinite (z)))
    {
      if (isfinite (x) && isfinite (y))
	{
	  if (isnan (z))
	    /* Domain error: pow(x<0,y=non-integer).  */
	    __set_errno (EDOM);
	  else
	    /* Pole error: pow(x=0,y<0).  Or overflow.  */
	    __set_errno (ERANGE);
	}
    }
  else if (__glibc_unlikely (z == 0) && isfinite (x) && x != 0 && isfinite (y))
    /* Underflow.  */
    __set_errno (ERANGE);
  return z;
}
declare_mgen_alias (__pow, pow)

#endif /* __USE_WRAPPER_TEMPLATE.  */
Commit	Line	Data
aec0821c	1	/* Wrapper to set errno for pow.
2b778ceb	2	Copyright (C) 2017-2021 Free Software Foundation, Inc.
aec0821c GG	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with the GNU C Library; if not, see
5a82c748	17	<https://www.gnu.org/licenses/>. */
aec0821c GG	18
	19	/* Only build wrappers from the templates for the types that define the macro
	20	below. This macro is set in math-type-macros-<type>.h in sysdeps/generic
	21	for each floating-point type. */
	22	#if __USE_WRAPPER_TEMPLATE
	23
46d2e49c	24	# include <errno.h>
aec0821c GG	25	# include <fenv.h>
	26	# include <math.h>
	27	# include <math_private.h>
	28
	29	FLOAT
	30	M_DECL_FUNC (__pow) (FLOAT x, FLOAT y)
	31	{
	32	FLOAT z = M_SUF (__ieee754_pow) (x, y);
	33	if (__glibc_unlikely (!isfinite (z)))
	34	{
	35	if (isfinite (x) && isfinite (y))
	36	{
	37	if (isnan (z))
	38	/* Domain error: pow(x<0,y=non-integer). */
	39	__set_errno (EDOM);
	40	else
	41	/* Pole error: pow(x=0,y<0). Or overflow. */
	42	__set_errno (ERANGE);
	43	}
	44	}
	45	else if (__glibc_unlikely (z == 0) && isfinite (x) && x != 0 && isfinite (y))
	46	/* Underflow. */
	47	__set_errno (ERANGE);
	48	return z;
	49	}
	50	declare_mgen_alias (__pow, pow)
	51
	52	#endif /* __USE_WRAPPER_TEMPLATE. */