40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/* $OpenBSD: e_tgammal.c,v 1.1 2011/07/06 00:02:42 martynas Exp $ */
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/*
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* Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <openlibm_math.h>
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#include "math_private.h"
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long double
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tgammal(long double x)
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{
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int64_t i0,i1;
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GET_LDOUBLE_WORDS64(i0,i1,x);
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if (((i0&0x7fffffffffffffffLL)|i1) == 0)
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return (1.0/x);
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if (i0<0 && (u_int64_t)i0<0xffff000000000000ULL && rintl(x)==x)
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return (x-x)/(x-x);
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if (i0==0xffff000000000000ULL && i1==0)
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return (x-x);
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return expl(lgammal(x));
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}
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