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annotate libquadmath/math/truncq.c @ 138:fc828634a951

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Thu, 08 Nov 2018 14:17:14 +0900
parents 04ced10e8804
children 1830386684a0
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* Truncate argument to nearest integral value not larger than the argument.
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2 Copyright (C) 1997-2017 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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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 truncq (__float128 x)
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27 {
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28 int32_t j0;
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29 uint64_t i0, i1, sx;
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30
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31 GET_FLT128_WORDS64 (i0, i1, x);
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32 sx = i0 & 0x8000000000000000ULL;
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33 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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34 if (j0 < 48)
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35 {
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36 if (j0 < 0)
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37 /* The magnitude of the number is < 1 so the result is +-0. */
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38 SET_FLT128_WORDS64 (x, sx, 0);
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39 else
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40 SET_FLT128_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0);
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41 }
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42 else if (j0 > 111)
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43 {
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44 if (j0 == 0x4000)
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45 /* x is inf or NaN. */
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46 return x + x;
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47 }
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48 else
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49 {
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50 SET_FLT128_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48)));
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51 }
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52
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53 return x;
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54 }