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Improve the accuracy of tgamma (BZ #26983)
[thirdparty/glibc.git] / math / w_lgamma_r_compat.c
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1/* @(#)wr_lgamma.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
cccda09f 8 * software is freely granted, provided that this notice
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9 * is preserved.
10 * ====================================================
11 */
12
cccda09f 13/*
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14 * wrapper double lgamma_r(double x, int *signgamp)
15 */
16
9d13fb24 17#include <math.h>
9277c064 18#include <math_private.h>
813378e9 19#include <math-svid-compat.h>
a8dce619 20#include <libm-alias-double.h>
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21
22
4f3647e4 23#if LIBM_SVID_COMPAT
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24double
25__lgamma_r(double x, int *signgamp)
f7eac6eb 26{
0ac5ae23 27 double y = __ieee754_lgamma_r(x,signgamp);
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28 if(__builtin_expect(!isfinite(y), 0)
29 && isfinite(x) && _LIB_VERSION != _IEEE_)
0ac5ae23 30 return __kernel_standard(x, x,
e44acb20 31 floor(x)==x&&x<=0.0
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32 ? 15 /* lgamma pole */
33 : 14); /* lgamma overflow */
34
35 return y;
cccda09f 36}
a8dce619 37libm_alias_double_r (__lgamma, lgamma, _r)
cccda09f 38#endif