lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* w_gammaf.c -- float version of w_gamma.c. |
| 2 | * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. |
| 3 | */ |
| 4 | |
| 5 | /* |
| 6 | * ==================================================== |
| 7 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 8 | * |
| 9 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
| 10 | * Permission to use, copy, modify, and distribute this |
| 11 | * software is freely granted, provided that this notice |
| 12 | * is preserved. |
| 13 | * ==================================================== |
| 14 | */ |
| 15 | |
| 16 | #include <errno.h> |
| 17 | #include <math.h> |
| 18 | #include <math_private.h> |
| 19 | |
| 20 | float |
| 21 | __tgammaf(float x) |
| 22 | { |
| 23 | int local_signgam; |
| 24 | float y = __ieee754_gammaf_r(x,&local_signgam); |
| 25 | |
| 26 | if(__glibc_unlikely (!isfinite (y) || y == 0) |
| 27 | && (isfinite (x) || isinf (x) < 0) |
| 28 | && _LIB_VERSION != _IEEE_) { |
| 29 | if (x == (float)0.0) |
| 30 | /* tgammaf pole */ |
| 31 | return __kernel_standard_f(x, x, 150); |
| 32 | else if(__floorf(x)==x&&x<0.0f) |
| 33 | /* tgammaf domain */ |
| 34 | return __kernel_standard_f(x, x, 141); |
| 35 | else if (y == 0) |
| 36 | /* tgammaf underflow */ |
| 37 | __set_errno (ERANGE); |
| 38 | else |
| 39 | /* tgammaf overflow */ |
| 40 | return __kernel_standard_f(x, x, 140); |
| 41 | } |
| 42 | return local_signgam < 0 ? - y : y; |
| 43 | } |
| 44 | weak_alias (__tgammaf, tgammaf) |