1/* Round argument to nearest integral value according to current rounding 2 direction. 3 Copyright (C) 1997, 1999, 2004, 2006 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and 6 Jakub Jelinek <jj@ultra.linux.cz>, 1999. 7 8 The GNU C Library is free software; you can redistribute it and/or 9 modify it under the terms of the GNU Lesser General Public 10 License as published by the Free Software Foundation; either 11 version 2.1 of the License, or (at your option) any later version. 12 13 The GNU C Library is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 Lesser General Public License for more details. 17 18 You should have received a copy of the GNU Lesser General Public 19 License along with the GNU C Library; if not, write to the Free 20 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 21 02111-1307 USA. */ 22 23#include "quadmath-imp.h" 24 25static const __float128 two112[2] = 26{ 27 5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */ 28 -5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */ 29}; 30 31long int 32lrintq (__float128 x) 33{ 34 int32_t j0; 35 uint64_t i0,i1; 36 volatile __float128 w; 37 __float128 t; 38 long int result; 39 int sx; 40 41 GET_FLT128_WORDS64 (i0, i1, x); 42 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; 43 sx = i0 >> 63; 44 i0 &= 0x0000ffffffffffffLL; 45 i0 |= 0x0001000000000000LL; 46 47 if (j0 < 48) 48 { 49 w = two112[sx] + x; 50 t = w - two112[sx]; 51 GET_FLT128_WORDS64 (i0, i1, t); 52 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; 53 i0 &= 0x0000ffffffffffffLL; 54 i0 |= 0x0001000000000000LL; 55 56 result = (j0 < 0 ? 0 : i0 >> (48 - j0)); 57 } 58 else if (j0 < (int32_t) (8 * sizeof (long int)) - 1) 59 { 60 if (j0 >= 112) 61 result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112)); 62 else 63 { 64 w = two112[sx] + x; 65 t = w - two112[sx]; 66 GET_FLT128_WORDS64 (i0, i1, t); 67 j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; 68 i0 &= 0x0000ffffffffffffLL; 69 i0 |= 0x0001000000000000LL; 70 71 if (j0 == 48) 72 result = (long int) i0; 73 else 74 result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0)); 75 } 76 } 77 else 78 { 79 /* The number is too large. It is left implementation defined 80 what happens. */ 81 return (long int) x; 82 } 83 84 return sx ? -result : result; 85} 86