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37 lines
1.3 KiB
C
37 lines
1.3 KiB
C
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/* Return arc cosine of X, divided by pi.
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Copyright (C) 2024 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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#include <errno.h>
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#include <math.h>
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#include <math_private.h>
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FLOAT
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M_DECL_FUNC (__acospi) (FLOAT x)
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{
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if (__glibc_unlikely (isgreater (M_FABS (x), M_LIT (1.0))))
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{
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__set_errno (EDOM);
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return (x - x) / (x - x);
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}
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FLOAT ret = M_SUF (__ieee754_acos) (x) / M_MLIT (M_PI);
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/* Ensure that rounding upward for both acos and the division cannot
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yield a return value from acospi greater than 1. */
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return isgreater (ret, M_LIT (1.0)) ? M_LIT (1.0) : ret;
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}
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declare_mgen_alias (__acospi, acospi);
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