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 #if defined(LIBM_SCCS) && !defined(lint) 17 static char rcsid[] = "$NetBSD: w_gammaf.c,v 1.4 1995/11/20 22:06:48 jtc Exp $"; 18 #endif 19 20 #include "math.h" 21 #include "math_private.h" 22 23 extern int signgam; 24 25 #ifdef __STDC__ 26 float gammaf(float x) 27 #else 28 float gammaf(x) 29 float x; 30 #endif 31 { 32 #ifdef _IEEE_LIBM 33 return __ieee754_lgammaf_r(x,&signgam); 34 #else 35 float y; 36 y = __ieee754_lgammaf_r(x,&signgam); 37 if(_LIB_VERSION == _IEEE_) return y; 38 if(!finitef(y)&&finitef(x)) { 39 if(floorf(x)==x&&x<=(float)0.0) 40 /* gammaf pole */ 41 return (float)__kernel_standard((double)x,(double)x,141); 42 else 43 /* gammaf overflow */ 44 return (float)__kernel_standard((double)x,(double)x,140); 45 } else 46 return y; 47 #endif 48 } 49