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parents:
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1 /* Round argument to nearest integral value according to current rounding
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2 direction.
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145
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3 Copyright (C) 1997-2018 Free Software Foundation, Inc.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4 This file is part of the GNU C Library.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
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111
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6 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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8 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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9 modify it under the terms of the GNU Lesser General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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10 License as published by the Free Software Foundation; either
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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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>
parents:
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12
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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13 The GNU C Library is distributed in the hope that it will be useful,
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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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>
parents:
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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>
parents:
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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>
parents:
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22 #include "quadmath-imp.h"
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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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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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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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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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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28 };
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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29
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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30 long int
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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31 lrintq (__float128 x)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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32 {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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33 int32_t j0;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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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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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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37 long int result;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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38 int sx;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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39
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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40 GET_FLT128_WORDS64 (i0, i1, x);
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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41 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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42 sx = i0 >> 63;
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parents:
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43 i0 &= 0x0000ffffffffffffLL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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44 i0 |= 0x0001000000000000LL;
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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45
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111
|
46 if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
|
68
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47 {
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111
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48 if (j0 < 48)
|
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49 {
|
|
50 #if defined FE_INVALID || defined FE_INEXACT
|
|
51 /* X < LONG_MAX + 1 implied by J0 < 31. */
|
|
52 if (sizeof (long int) == 4
|
|
53 && x > (__float128) LONG_MAX)
|
|
54 {
|
|
55 /* In the event of overflow we must raise the "invalid"
|
|
56 exception, but not "inexact". */
|
|
57 t = nearbyintq (x);
|
|
58 feraiseexcept (t == LONG_MAX ? FE_INEXACT : FE_INVALID);
|
|
59 }
|
|
60 else
|
|
61 #endif
|
|
62 {
|
|
63 w = two112[sx] + x;
|
|
64 t = w - two112[sx];
|
|
65 }
|
|
66 GET_FLT128_WORDS64 (i0, i1, t);
|
|
67 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
|
|
68 i0 &= 0x0000ffffffffffffLL;
|
|
69 i0 |= 0x0001000000000000LL;
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68
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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70
|
111
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71 result = (j0 < 0 ? 0 : i0 >> (48 - j0));
|
|
72 }
|
|
73 else if (j0 >= 112)
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parents:
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74 result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
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parents:
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75 else
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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76 {
|
111
|
77 #if defined FE_INVALID || defined FE_INEXACT
|
|
78 /* X < LONG_MAX + 1 implied by J0 < 63. */
|
|
79 if (sizeof (long int) == 8
|
|
80 && x > (__float128) LONG_MAX)
|
|
81 {
|
|
82 /* In the event of overflow we must raise the "invalid"
|
|
83 exception, but not "inexact". */
|
|
84 t = nearbyintq (x);
|
|
85 feraiseexcept (t == LONG_MAX ? FE_INEXACT : FE_INVALID);
|
|
86 }
|
|
87 else
|
|
88 #endif
|
|
89 {
|
|
90 w = two112[sx] + x;
|
|
91 t = w - two112[sx];
|
|
92 }
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68
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parents:
diff
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93 GET_FLT128_WORDS64 (i0, i1, t);
|
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parents:
diff
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94 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
|
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parents:
diff
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95 i0 &= 0x0000ffffffffffffLL;
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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96 i0 |= 0x0001000000000000LL;
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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|
97
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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|
98 if (j0 == 48)
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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|
99 result = (long int) i0;
|
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parents:
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100 else
|
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parents:
diff
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101 result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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102 }
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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|
103 }
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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|
104 else
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
105 {
|
111
|
106 /* The number is too large. Unless it rounds to LONG_MIN,
|
|
107 FE_INVALID must be raised and the return value is
|
|
108 unspecified. */
|
|
109 #if defined FE_INVALID || defined FE_INEXACT
|
|
110 if (x < (__float128) LONG_MIN
|
145
|
111 && x > (__float128) LONG_MIN - 1)
|
111
|
112 {
|
|
113 /* If truncation produces LONG_MIN, the cast will not raise
|
|
114 the exception, but may raise "inexact". */
|
|
115 t = nearbyintq (x);
|
|
116 feraiseexcept (t == LONG_MIN ? FE_INEXACT : FE_INVALID);
|
|
117 return LONG_MIN;
|
|
118 }
|
145
|
119 else if (FIX_FLT128_LONG_CONVERT_OVERFLOW && x != (__float128) LONG_MIN)
|
|
120 {
|
|
121 feraiseexcept (FE_INVALID);
|
|
122 return sx == 0 ? LONG_MAX : LONG_MIN;
|
|
123 }
|
|
124
|
111
|
125 #endif
|
68
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
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|
126 return (long int) x;
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
127 }
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
128
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
129 return sx ? -result : result;
|
Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
diff
changeset
|
130 }
|