/* Round double value to long int. Copyright (C) 1997, 2004 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <math.h> #include "math_private.h" long int lround (double x) { int32_t _j0; u_int32_t i1, i0; long int result; int sign; EXTRACT_WORDS (i0, i1, x); _j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; sign = (i0 & 0x80000000) != 0 ? -1 : 1; i0 &= 0xfffff; i0 |= 0x100000; if (_j0 < 20) { if (_j0 < 0) return _j0 < -1 ? 0 : sign; else { i0 += 0x80000 >> _j0; result = i0 >> (20 - _j0); } } else if (_j0 < (int32_t) (8 * sizeof (long int)) - 1) { if (_j0 >= 52) result = ((long int) i0 << (_j0 - 20)) | (i1 << (_j0 - 52)); else { u_int32_t j = i1 + (0x80000000 >> (_j0 - 20)); if (j < i1) ++i0; if (_j0 == 20) result = (long int) i0; else result = ((long int) i0 << (_j0 - 20)) | (j >> (52 - _j0)); } } else { /* The number is too large. It is left implementation defined what happens. */ return (long int) x; } return sign * result; } libm_hidden_def(lround)