| Rev | Line | |
|---|
| [1] | 1 | |
|---|
| 2 | /* @(#)w_lgamma.c 5.1 93/09/24 */ |
|---|
| 3 | /* |
|---|
| 4 | * ==================================================== |
|---|
| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
|---|
| 6 | * |
|---|
| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
|---|
| 8 | * Permission to use, copy, modify, and distribute this |
|---|
| 9 | * software is freely granted, provided that this notice |
|---|
| 10 | * is preserved. |
|---|
| 11 | * ==================================================== |
|---|
| 12 | * |
|---|
| 13 | */ |
|---|
| 14 | |
|---|
| 15 | /* double lgamma(double x) |
|---|
| 16 | * Return the logarithm of the Gamma function of x. |
|---|
| 17 | * |
|---|
| 18 | * Method: call __ieee754_lgamma_r |
|---|
| 19 | */ |
|---|
| 20 | |
|---|
| 21 | #include <libm/fdlibm.h> |
|---|
| 22 | |
|---|
| 23 | //extern int signgam; |
|---|
| 24 | |
|---|
| 25 | #ifdef __STDC__ |
|---|
| 26 | double lgamma(double x) |
|---|
| 27 | #else |
|---|
| 28 | double lgamma(x) |
|---|
| 29 | double x; |
|---|
| 30 | #endif |
|---|
| 31 | { |
|---|
| 32 | #ifdef _IEEE_LIBM |
|---|
| 33 | return __ieee754_lgamma_r(x,&signgam); |
|---|
| 34 | #else |
|---|
| 35 | double y; |
|---|
| 36 | y = __ieee754_lgamma_r(x,&signgam); |
|---|
| 37 | if(_LIB_VERSION == _IEEE_) return y; |
|---|
| 38 | if(!finite(y)&&finite(x)) { |
|---|
| 39 | if(floor(x)==x&&x<=0.0) |
|---|
| 40 | return __kernel_standard(x,x,15); /* lgamma pole */ |
|---|
| 41 | else |
|---|
| 42 | return __kernel_standard(x,x,14); /* lgamma overflow */ |
|---|
| 43 | } else |
|---|
| 44 | return y; |
|---|
| 45 | #endif |
|---|
| 46 | } |
|---|
Note: See
TracBrowser
for help on using the repository browser.
