1 /* $OpenBSD: e_tgammal.c,v 1.1 2011/07/06 00:02:42 martynas Exp $ */ 2 3 /* 4 * Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <openlibm.h> 20 21 #include "math_private.h" 22 23 long double 24 tgammal(long double x) 25 { 26 int64_t i0,i1; 27 28 GET_LDOUBLE_WORDS64(i0,i1,x); 29 if (((i0&0x7fffffffffffffffLL)|i1) == 0) 30 return (1.0/x); 31 32 if (i0<0 && (u_int64_t)i0<0xffff000000000000ULL && rintl(x)==x) 33 return (x-x)/(x-x); 34 35 if (i0==0xffff000000000000ULL && i1==0) 36 return (x-x); 37 38 return expl(lgammal(x)); 39 } 40