Blame math/w_atan2f_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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/*
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 * wrapper atan2f(y,x)
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 */
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#include <errno.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-float.h>
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#if LIBM_SVID_COMPAT
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float
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__atan2f (float y, float x)
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{
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  float z;
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  if (__builtin_expect (x == 0.0f && y == 0.0f, 0) && _LIB_VERSION == _SVID_)
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    return __kernel_standard_f (y, x, 103); /* atan2(+-0,+-0) */
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  z = __ieee754_atan2f (y, x);
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  if (__glibc_unlikely (z == 0.0f && y != 0.0f && isfinite (x)))
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    __set_errno (ERANGE);
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  return z;
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}
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libm_alias_float (__atan2, atan2)
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#endif