1/* Round long double value to long long int. 2 Copyright (C) 1997, 2001 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, write to the Free 18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 USA. */ 20 21#include <math.h> 22 23#include "math_private.h" 24 25 26long long int 27__llroundl (long double x) 28{ 29 int32_t j0; 30 u_int32_t se, i1, i0; 31 long long int result; 32 int sign; 33 34 GET_LDOUBLE_WORDS (se, i0, i1, x); 35 j0 = (se & 0x7fff) - 0x3fff; 36 sign = (se & 0x8000) != 0 ? -1 : 1; 37 38 if (j0 < 31) 39 { 40 if (j0 < 0) 41 return j0 < -1 ? 0 : sign; 42 else 43 { 44 u_int32_t j = i0 + (0x40000000 >> j0); 45 if (j < i0) 46 { 47 j >>= 1; 48 j |= 0x80000000; 49 ++j0; 50 } 51 52 result = j >> (31 - j0); 53 } 54 } 55 else if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) 56 { 57 if (j0 >= 63) 58 result = (((long long int) i0 << 32) | i1) << (j0 - 63); 59 else 60 { 61 u_int32_t j = i1 + (0x80000000 >> (j0 - 31)); 62 63 result = (long long int) i0; 64 if (j < i1) 65 ++result; 66 67 if (j0 > 31) 68 result = (result << (j0 - 31)) | (j >> (63 - j0)); 69 } 70 } 71 else 72 { 73 /* The number is too large. It is left implementation defined 74 what happens. */ 75 return (long long int) x; 76 } 77 78 return sign * result; 79} 80 81weak_alias (__llroundl, llroundl) 82