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annotate libquadmath/math/roundq.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents 561a7518be6b
children 1830386684a0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* Round __float128 to integer away from zero.
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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 __float128
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25 roundq (__float128 x)
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26 {
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27 int32_t j0;
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28 uint64_t i1, i0;
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29
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30 GET_FLT128_WORDS64 (i0, i1, x);
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31 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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32 if (j0 < 48)
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33 {
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34 if (j0 < 0)
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35 {
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36 i0 &= 0x8000000000000000ULL;
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37 if (j0 == -1)
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38 i0 |= 0x3fff000000000000LL;
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39 i1 = 0;
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40 }
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41 else
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42 {
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43 uint64_t i = 0x0000ffffffffffffLL >> j0;
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44 if (((i0 & i) | i1) == 0)
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45 /* X is integral. */
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46 return x;
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47 i0 += 0x0000800000000000LL >> j0;
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48 i0 &= ~i;
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49 i1 = 0;
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50 }
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51 }
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52 else if (j0 > 111)
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53 {
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54 if (j0 == 0x4000)
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55 /* Inf or NaN. */
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56 return x + x;
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57 else
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58 return x;
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59 }
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60 else
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61 {
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62 uint64_t i = -1ULL >> (j0 - 48);
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63 if ((i1 & i) == 0)
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64 /* X is integral. */
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65 return x;
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66
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67 uint64_t j = i1 + (1LL << (111 - j0));
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68 if (j < i1)
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69 i0 += 1;
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70 i1 = j;
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71 i1 &= ~i;
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72 }
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73
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74 SET_FLT128_WORDS64 (x, i0, i1);
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75 return x;
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76 }