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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [lrintq.c] - Rev 774
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/* Round argument to nearest integral value according to current rounding direction. Copyright (C) 1997, 1999, 2004, 2006 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 two112[2] = { 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */ -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */ }; long int lrintq (__float128 x) { int32_t j0; uint64_t i0,i1; volatile __float128 w; __float128 t; long int result; int sx; GET_FLT128_WORDS64 (i0, i1, x); j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; sx = i0 >> 63; i0 &= 0x0000ffffffffffffLL; i0 |= 0x0001000000000000LL; if (j0 < 48) { w = two112[sx] + x; t = w - two112[sx]; GET_FLT128_WORDS64 (i0, i1, t); j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; i0 &= 0x0000ffffffffffffLL; i0 |= 0x0001000000000000LL; result = (j0 < 0 ? 0 : 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 { w = two112[sx] + x; t = w - two112[sx]; GET_FLT128_WORDS64 (i0, i1, t); j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; i0 &= 0x0000ffffffffffffLL; i0 |= 0x0001000000000000LL; if (j0 == 48) result = (long int) i0; else result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0)); } } else { /* The number is too large. It is left implementation defined what happens. */ return (long int) x; } return sx ? -result : result; }
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