/* Round argument to nearest integral value according to current rounding direction. Copyright (C) 1997, 2004, 2006 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <features.h> /* Prevent math.h from defining a colliding inline */ #undef __USE_EXTERN_INLINES #include <math.h> #include "math_private.h" static const double two52[2] = { 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ }; long long int llrint (double x) { int32_t _j0; u_int32_t i1, i0; long long int result; volatile double w; double t; int sx; EXTRACT_WORDS (i0, i1, x); _j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; sx = i0 >> 31; i0 &= 0xfffff; i0 |= 0x100000; if (_j0 < 20) { w = two52[sx] + x; t = w - two52[sx]; EXTRACT_WORDS (i0, i1, t); _j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; i0 &= 0xfffff; i0 |= 0x100000; result = (_j0 < 0 ? 0 : i0 >> (20 - _j0)); } else if (_j0 < (int32_t) (8 * sizeof (long long int)) - 1) { if (_j0 >= 52) result = (((long long int) i0 << 32) | i1) << (_j0 - 52); else { w = two52[sx] + x; t = w - two52[sx]; EXTRACT_WORDS (i0, i1, t); _j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; i0 &= 0xfffff; i0 |= 0x100000; if (_j0 == 20) result = (long long int) i0; else result = ((long long int) i0 << (_j0 - 20)) | (i1 >> (52 - _j0)); } } else { /* The number is too large. It is left implementation defined what happens. */ return (long long int) x; } return sx ? -result : result; } libm_hidden_def(llrint)