/* Round long double to integer away from zero. Copyright (C) 1997, 1999 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" static const __float128 huge = 1.0E4930Q; __float128 roundq (__float128 x) { int32_t j0; uint64_t i1, i0; GET_FLT128_WORDS64 (i0, i1, x); j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; if (j0 < 31) { if (j0 < 0) { if (huge + x > 0.0) { i0 &= 0x8000000000000000ULL; if (j0 == -1) i0 |= 0x3fff000000000000LL; i1 = 0; } } else { uint64_t i = 0x0000ffffffffffffLL >> j0; if (((i0 & i) | i1) == 0) /* X is integral. */ return x; if (huge + x > 0.0) { /* Raise inexact if x != 0. */ i0 += 0x0000800000000000LL >> j0; i0 &= ~i; i1 = 0; } } } else if (j0 > 111) { if (j0 == 0x4000) /* Inf or NaN. */ return x + x; else return x; } else { uint64_t i = -1ULL >> (j0 - 48); if ((i1 & i) == 0) /* X is integral. */ return x; if (huge + x > 0.0) { /* Raise inexact if x != 0. */ uint64_t j = i1 + (1LL << (111 - j0)); if (j < i1) i0 += 1; i1 = j; } i1 &= ~i; } SET_FLT128_WORDS64 (x, i0, i1); return x; }