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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [lroundq.c] - Rev 776
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/* Round long double value to long int. Copyright (C) 1997, 1999, 2004 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and Jakub Jelinek <jj@ultra.linux.cz>, 1999. 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 "quadmath-imp.h" long int lroundq (__float128 x) { int64_t j0; uint64_t i1, i0; long int result; int sign; GET_FLT128_WORDS64 (i0, i1, x); j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1; i0 &= 0x0000ffffffffffffLL; i0 |= 0x0001000000000000LL; if (j0 < 48) { if (j0 < 0) return j0 < -1 ? 0 : sign; else { i0 += 0x0000800000000000LL >> j0; result = i0 >> (48 - j0); } } else if (j0 < (int32_t) (8 * sizeof (long int)) - 1) { if (j0 >= 112) result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112)); else { uint64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48)); if (j < i1) ++i0; if (j0 == 48) result = (long int) i0; else result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0)); } } else { /* The number is too large. It is left implementation defined what happens. */ return (long int) x; } return sign * result; }
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