45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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/*
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* wrapper atan2(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-double.h>
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#if LIBM_SVID_COMPAT
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double
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__atan2 (double y, double x)
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{
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double z;
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if (__builtin_expect (x == 0.0 && y == 0.0, 0) && _LIB_VERSION == _SVID_)
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return __kernel_standard (y, x, 3); /* atan2(+-0,+-0) */
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z = __ieee754_atan2 (y, x);
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if (__glibc_unlikely (z == 0.0 && y != 0.0 && 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_double (__atan2, atan2)
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#endif
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