Mercurial > hg > CbC > CbC_gcc

comparison libquadmath/math/lroundq.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents 561a7518be6b
children 1830386684a0
comparison
equal deleted inserted replaced
68:561a7518be6b 111:04ced10e8804
1 /* Round long double value to long int. 1 /* Round __float128 value to long int.
2 Copyright (C) 1997, 1999, 2004 Free Software Foundation, Inc. 2 Copyright (C) 1997-2017 Free Software Foundation, Inc.
3 This file is part of the GNU C Library. 3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and 4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
5 Jakub Jelinek <jj@ultra.linux.cz>, 1999. 5 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
6 6
7 The GNU C Library is free software; you can redistribute it and/or 7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public 8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either 9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version. 10 version 2.1 of the License, or (at your option) any later version.
34 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; 34 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
35 sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1; 35 sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1;
36 i0 &= 0x0000ffffffffffffLL; 36 i0 &= 0x0000ffffffffffffLL;
37 i0 |= 0x0001000000000000LL; 37 i0 |= 0x0001000000000000LL;
38 38
39 if (j0 < 48) 39 if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
40 { 40 {
41 if (j0 < 0) 41 if (j0 < 48)
42 return j0 < -1 ? 0 : sign;
43 else
44 { 42 {
45 i0 += 0x0000800000000000LL >> j0; 43 if (j0 < 0)
46 result = i0 >> (48 - j0); 44 return j0 < -1 ? 0 : sign;
45 else
46 {
47 i0 += 0x0000800000000000LL >> j0;
48 result = i0 >> (48 - j0);
49 #if defined FE_INVALID && defined USE_FENV_H
50 if (sizeof (long int) == 4
51 && sign == 1
52 && result == LONG_MIN)
53 /* Rounding brought the value out of range. */
54 feraiseexcept (FE_INVALID);
55 #endif
56 }
47 } 57 }
48 } 58 else if (j0 >= 112)
49 else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
50 {
51 if (j0 >= 112)
52 result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112)); 59 result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
53 else 60 else
54 { 61 {
55 uint64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48)); 62 uint64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48));
56 if (j < i1) 63 if (j < i1)
57 ++i0; 64 ++i0;
58 65
59 if (j0 == 48) 66 if (j0 == 48)
60 result = (long int) i0; 67 result = (long int) i0;
61 else 68 else
62 result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0)); 69 {
70 result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0));
71 #if defined FE_INVALID && defined USE_FENV_H
72 if (sizeof (long int) == 8
73 && sign == 1
74 && result == LONG_MIN)
75 /* Rounding brought the value out of range. */
76 feraiseexcept (FE_INVALID);
77 #endif
78 }
63 } 79 }
64 } 80 }
65 else 81 else
66 { 82 {
67 /* The number is too large. It is left implementation defined 83 /* The number is too large. Unless it rounds to LONG_MIN,
68 what happens. */ 84 FE_INVALID must be raised and the return value is
85 unspecified. */
86 #ifdef FE_INVALID
87 if (x <= (__float128) LONG_MIN - 0.5Q)
88 {
89 /* If truncation produces LONG_MIN, the cast will not raise
90 the exception, but may raise "inexact". */
91 #ifdef USE_FENV_H
92 feraiseexcept (FE_INVALID);
93 #endif
94 return LONG_MIN;
95 }
96 #endif
69 return (long int) x; 97 return (long int) x;
70 } 98 }
71 99
72 return sign * result; 100 return sign * result;
73 } 101 }