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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) 1997-2018 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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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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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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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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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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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16 Lesser General Public License for more details.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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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, see
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20 <http://www.gnu.org/licenses/>. */
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21
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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22 #include "quadmath-imp.h"
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23
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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24 static const __float128 two112[2] =
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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25 {
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26 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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27 -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */
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28 };
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29
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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30 long long int
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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31 llrintq (__float128 x)
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32 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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33 int32_t j0;
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34 uint64_t i0,i1;
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35 __float128 w;
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36 __float128 t;
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37 long long int result;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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38 int sx;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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39
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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40 GET_FLT128_WORDS64 (i0, i1, x);
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41 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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42 sx = i0 >> 63;
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43 i0 &= 0x0000ffffffffffffLL;
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44 i0 |= 0x0001000000000000LL;
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45
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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46 if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
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47 {
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111
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48 #if defined FE_INVALID || defined FE_INEXACT
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49 /* X < LLONG_MAX + 1 implied by J0 < 63. */
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50 if (x > (__float128) LLONG_MAX)
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51 {
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52 /* In the event of overflow we must raise the "invalid"
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53 exception, but not "inexact". */
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54 t = nearbyintq (x);
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55 feraiseexcept (t == LLONG_MAX ? FE_INEXACT : FE_INVALID);
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56 }
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57 else
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58 #endif
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59 {
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60 w = two112[sx] + x;
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61 t = w - two112[sx];
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62 }
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63 GET_FLT128_WORDS64 (i0, i1, t);
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64 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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65 i0 &= 0x0000ffffffffffffLL;
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66 i0 |= 0x0001000000000000LL;
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67
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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68 if (j0 < 0)
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69 result = 0;
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70 else if (j0 <= 48)
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71 result = i0 >> (48 - j0);
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72 else
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73 result = ((long long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
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74 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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75 else
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parents:
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76 {
|
111
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77 /* The number is too large. Unless it rounds to LLONG_MIN,
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78 FE_INVALID must be raised and the return value is
|
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79 unspecified. */
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80 #if defined FE_INVALID || defined FE_INEXACT
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81 if (x < (__float128) LLONG_MIN
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145
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82 && x > (__float128) LLONG_MIN - 1)
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111
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83 {
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84 /* If truncation produces LLONG_MIN, the cast will not raise
|
|
85 the exception, but may raise "inexact". */
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86 t = nearbyintq (x);
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87 feraiseexcept (t == LLONG_MIN ? FE_INEXACT : FE_INVALID);
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88 return LLONG_MIN;
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89 }
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90 else if (FIX_FLT128_LLONG_CONVERT_OVERFLOW && x != (__float128) LLONG_MIN)
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|
91 {
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92 feraiseexcept (FE_INVALID);
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93 return sx == 0 ? LLONG_MAX : LLONG_MIN;
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|
94 }
|
111
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95
|
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96 #endif
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97 return (long long int) x;
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parents:
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98 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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99
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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100 return sx ? -result : result;
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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101 }
|