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path: root/libm/s_llround.c
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 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 ``` ``````/* Round double value to long long int. Copyright (C) 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 1997. 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 #include "math_private.h" long long int llround (double x) { int32_t j0; u_int32_t i1, i0; long long int result; int sign; EXTRACT_WORDS (i0, i1, x); j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; sign = (i0 & 0x80000000) != 0 ? -1 : 1; i0 &= 0xfffff; i0 |= 0x100000; if (j0 < 20) { if (j0 < 0) return j0 < -1 ? 0 : sign; else { i0 += 0x80000 >> j0; result = i0 >> (20 - j0); } } else if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) { if (j0 >= 52) result = (((long long int) i0 << 32) | i1) << (j0 - 52); else { u_int32_t j = i1 + (0x80000000 >> (j0 - 20)); if (j < i1) ++i0; if (j0 == 20) result = (long long int) i0; else result = ((long long int) i0 << (j0 - 20)) | (j >> (52 - j0)); } } else { /* The number is too large. It is left implementation defined what happens. */ return (long long int) x; } return sign * result; } libm_hidden_def(llround) ``````