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annotate libquadmath/math/tgammaq.c @ 118:fd00160c1b76

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ifdef TARGET_64BIT
author mir3636
date Tue, 27 Feb 2018 15:01:35 +0900
parents 04ced10e8804
children 1830386684a0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* Implementation of gamma function according to ISO C.
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2 Copyright (C) 1997, 1999, 2002, 2004 Free Software Foundation, Inc.
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3 This file is part of the GNU C Library.
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4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
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5 Jakub Jelinek <jj@ultra.linux.cz, 1999.
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6
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7 The GNU C Library is free software; you can redistribute it and/or
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 modify it under the terms of the GNU Lesser General Public
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9 License as published by the Free Software Foundation; either
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10 version 2.1 of the License, or (at your option) any later version.
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11
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12 The GNU C Library is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 Lesser General Public License for more details.
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16
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17 You should have received a copy of the GNU Lesser General Public
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18 License along with the GNU C Library; if not, write to the Free
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19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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20 02111-1307 USA. */
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21
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22 #include "quadmath-imp.h"
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23
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24
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25 __float128
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26 tgammaq (__float128 x)
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27 {
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28 /* We don't have a real gamma implementation now. We'll use lgamma
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29 and the exp function. But due to the required boundary
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30 conditions we must check some values separately. */
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31 int64_t hx;
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32 uint64_t lx;
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33 __float128 res;
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34 int sign;
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35
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36 GET_FLT128_WORDS64 (hx, lx, x);
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37
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38 if (((hx & 0x7fffffffffffffffLL) | lx) == 0)
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39 /* Return value for x == 0 is Inf with divide by zero exception. */
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40 return 1.0 / x;
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41
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42 if (hx < 0 && (uint64_t) hx < 0xffff000000000000ULL && rintq (x) == x)
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43 /* Return value for integer x < 0 is NaN with invalid exception. */
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44 return (x - x) / (x - x);
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45
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46 if (hx == 0xffff000000000000ULL && lx == 0)
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47 /* x == -Inf. According to ISO this is NaN. */
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48 return x - x;
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49
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50 /* XXX FIXME. */
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51 res = expq (lgammaq (x));
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52 return signbitq (x) ? -res : res;
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53 }