/* Round argument to nearest integral value according to current rounding direction. Copyright (C) 1997 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. 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" static const long double two63[2] = { 9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */ -9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */ }; long int __lrintl (long double x) { int32_t se,j0; u_int32_t i0, i1; long int result; volatile long double w; long double t; int sx; GET_LDOUBLE_WORDS (se, i0, i1, x); sx = (se >> 15) & 1; j0 = (se & 0x7fff) - 0x3fff; if (j0 < 31) { if (j0 < -1) return 0; else { w = two63[sx] + x; t = w - two63[sx]; GET_LDOUBLE_WORDS (se, i0, i1, t); j0 = (se & 0x7fff) - 0x3fff; result = i0 >> (31 - j0); } } else if (j0 < (int32_t) (8 * sizeof (long int)) - 1) { if (j0 >= 63) result = ((long int) i0 << (j0 - 31)) | (i1 << (j0 - 63)); else { w = two63[sx] + x; t = w - two63[sx]; GET_LDOUBLE_WORDS (se, i0, i1, t); j0 = (se & 0x7fff) - 0x3fff; result = ((long int) i0 << (j0 - 31)) | (i1 >> (63 - j0)); } } else { /* The number is too large. It is left implementation defined what happens. */ return (long int) x; } return sx ? -result : result; } weak_alias (__lrintl, lrintl)