1 /* Round argument to nearest integral value according to current rounding
3 Copyright (C) 1997, 2004, 2006 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 /* Prevent math.h from defining a colliding inline */
24 #undef __USE_EXTERN_INLINES
26 #include "math_private.h"
28 static const double two52[2] =
30 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
31 -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
44 EXTRACT_WORDS (i0, i1, x);
45 j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
54 EXTRACT_WORDS (i0, i1, t);
55 j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
59 result = (j0 < 0 ? 0 : i0 >> (20 - j0));
61 else if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
64 result = (((long long int) i0 << 32) | i1) << (j0 - 52);
69 EXTRACT_WORDS (i0, i1, t);
70 j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
75 result = (long long int) i0;
77 result = ((long long int) i0 << (j0 - 20)) | (i1 >> (52 - j0));
82 /* The number is too large. It is left implementation defined
84 return (long long int) x;
87 return sx ? -result : result;
90 libm_hidden_def(llrint)