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annotate libquadmath/math/llrintq.c @ 125:2c7bdd5a49f6

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supress return with no value, in function returning non-void warning on goto code segment in normal function
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Sun, 01 Apr 2018 14:05:45 +0900
parents 04ced10e8804
children 1830386684a0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 /* Round argument to nearest integral value according to current rounding
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2 direction.
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3 Copyright (C) 1997-2017 Free Software Foundation, Inc.
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4 This file is part of the GNU C Library.
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5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
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6 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
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7
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8 The GNU C Library is free software; you can redistribute it and/or
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9 modify it under the terms of the GNU Lesser General Public
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10 License as published by the Free Software Foundation; either
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11 version 2.1 of the License, or (at your option) any later version.
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12
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13 The GNU C Library is distributed in the hope that it will be useful,
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 Lesser General Public License for more details.
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17
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18 You should have received a copy of the GNU Lesser General Public
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19 License along with the GNU C Library; if not, write to the Free
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20 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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21 02111-1307 USA. */
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22
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23 #include "quadmath-imp.h"
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24
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25 static const __float128 two112[2] =
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26 {
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27 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
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28 -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */
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29 };
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30
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31 long long int
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32 llrintq (__float128 x)
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33 {
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34 int32_t j0;
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35 uint64_t i0,i1;
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36 __float128 w;
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37 __float128 t;
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38 long long int result;
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39 int sx;
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40
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41 GET_FLT128_WORDS64 (i0, i1, x);
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42 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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43 sx = i0 >> 63;
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44 i0 &= 0x0000ffffffffffffLL;
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45 i0 |= 0x0001000000000000LL;
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46
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47 if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
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48 {
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49 #if defined FE_INVALID || defined FE_INEXACT
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50 /* X < LLONG_MAX + 1 implied by J0 < 63. */
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51 if (x > (__float128) LLONG_MAX)
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52 {
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53 /* In the event of overflow we must raise the "invalid"
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54 exception, but not "inexact". */
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55 t = nearbyintq (x);
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56 #ifdef USE_FENV_H
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57 feraiseexcept (t == LLONG_MAX ? FE_INEXACT : FE_INVALID);
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58 #endif
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59 }
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60 else
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61 #endif
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62 {
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63 w = two112[sx] + x;
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64 t = w - two112[sx];
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65 }
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66 GET_FLT128_WORDS64 (i0, i1, t);
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67 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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68 i0 &= 0x0000ffffffffffffLL;
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69 i0 |= 0x0001000000000000LL;
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70
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71 if (j0 < 0)
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72 result = 0;
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73 else if (j0 <= 48)
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74 result = i0 >> (48 - j0);
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75 else
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76 result = ((long long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
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77 }
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78 else
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79 {
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80 /* The number is too large. Unless it rounds to LLONG_MIN,
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81 FE_INVALID must be raised and the return value is
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82 unspecified. */
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83 #if defined FE_INVALID || defined FE_INEXACT
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84 if (x < (__float128) LLONG_MIN
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85 && x > (__float128) LLONG_MIN - 1.0Q)
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86 {
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87 /* If truncation produces LLONG_MIN, the cast will not raise
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88 the exception, but may raise "inexact". */
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89 t = nearbyintq (x);
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90 #ifdef USE_FENV_H
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91 feraiseexcept (t == LLONG_MIN ? FE_INEXACT : FE_INVALID);
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92 #endif
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93 return LLONG_MIN;
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94 }
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95
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96 #endif
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97
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98 /* The number is too large. It is left implementation defined
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99 what happens. */
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100 return (long long int) x;
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101 }
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102
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103 return sx ? -result : result;
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104 }