| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* w_lgammal.c -- long double version of w_lgamma.c. |
| 2 | * Conversion to long double by Ulrich Drepper, |
| 3 | * Cygnus Support, drepper@cygnus.com. |
| 4 | */ |
| 5 | |
| 6 | /* |
| 7 | * ==================================================== |
| 8 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 9 | * |
| 10 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
| 11 | * Permission to use, copy, modify, and distribute this |
| 12 | * software is freely granted, provided that this notice |
| 13 | * is preserved. |
| 14 | * ==================================================== |
| 15 | */ |
| 16 | |
| 17 | /* long double lgammal(long double x) |
| 18 | * Return the logarithm of the Gamma function of x. |
| 19 | * |
| 20 | * Method: call __ieee754_lgammal_r |
| 21 | */ |
| 22 | |
| 23 | #include <math.h> |
| 24 | #include <math_private.h> |
| 25 | |
| 26 | long double |
| 27 | __lgammal(long double x) |
| 28 | { |
| 29 | int local_signgam = 0; |
| 30 | long double y = __ieee754_lgammal_r(x, |
| 31 | _LIB_VERSION != _ISOC_ |
| 32 | /* ISO C99 does not define the |
| 33 | global variable. */ |
| 34 | ? &signgam |
| 35 | : &local_signgam); |
| 36 | if(__builtin_expect(!isfinite(y), 0) |
| 37 | && isfinite(x) && _LIB_VERSION != _IEEE_) |
| 38 | return __kernel_standard_l(x, x, |
| 39 | __floorl(x)==x&&x<=0.0L |
| 40 | ? 215 /* lgamma pole */ |
| 41 | : 214); /* lgamma overflow */ |
| 42 | |
| 43 | return y; |
| 44 | } |
| 45 | weak_alias (__lgammal, lgammal) |
| 46 | strong_alias (__lgammal, __gammal) |
| 47 | weak_alias (__gammal, gammal) |