Blame math/w_jn_compat.c

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/* Copyright (C) 2011-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#include <fenv.h>
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#include <math.h>
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#include <math_private.h>
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#include <math-svid-compat.h>
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#include <libm-alias-double.h>
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#if LIBM_SVID_COMPAT
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/* wrapper jn */
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double
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__jn (int n, double x)
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{
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  if (__builtin_expect (isgreater (fabs (x), X_TLOSS), 0)
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      && _LIB_VERSION != _IEEE_ && _LIB_VERSION != _POSIX_)
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    /* jn(n,|x|>X_TLOSS) */
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    return __kernel_standard (n, x, 38);
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  return __ieee754_jn (n, x);
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}
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libm_alias_double (__jn, jn)
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/* wrapper yn */
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double
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__yn (int n, double x)
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{
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  if (__builtin_expect (islessequal (x, 0.0) || isgreater (x, X_TLOSS), 0)
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      && _LIB_VERSION != _IEEE_)
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    {
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      if (x < 0.0)
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	{
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	  /* d = zero/(x-x) */
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	  __feraiseexcept (FE_INVALID);
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	  return __kernel_standard (n, x, 13);
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	}
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      else if (x == 0.0)
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	{
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	  /* d = -one/(x-x) */
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	  __feraiseexcept (FE_DIVBYZERO);
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	  return __kernel_standard (n, x, 12);
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	}
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      else if (_LIB_VERSION != _POSIX_)
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	/* yn(n,x>X_TLOSS) */
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	return __kernel_standard (n, x, 39);
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    }
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  return __ieee754_yn (n, x);
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}
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libm_alias_double (__yn, yn)
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#endif