w_gammaf.c (1241B)
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 #ifndef lint 17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_gammaf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 extern int signgam; 24 25 float 26 gammaf(float x) 27 { 28 #ifdef _IEEE_LIBM 29 return __ieee754_gammaf_r(x,&signgam); 30 #else 31 float y; 32 y = __ieee754_gammaf_r(x,&signgam); 33 if(_LIB_VERSION == _IEEE_) return y; 34 if(!finitef(y)&&finitef(x)) { 35 if(floorf(x)==x&&x<=(float)0.0) 36 /* gammaf pole */ 37 return (float)__kernel_standard((double)x,(double)x,141); 38 else 39 /* gammaf overflow */ 40 return (float)__kernel_standard((double)x,(double)x,140); 41 } else 42 return y; 43 #endif 44 }