| /* Round argument to nearest integral value according to current rounding |
| direction. |
| Copyright (C) 1997-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <fenv.h> |
| #include <limits.h> |
| #include <math.h> |
| |
| #include <math_private.h> |
| #include <libm-alias-ldouble.h> |
| |
| static const long double two63[2] = |
| { |
| 9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */ |
| -9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */ |
| }; |
| |
| |
| long long int |
| __llrintl (long double x) |
| { |
| int32_t se,j0; |
| uint32_t i0, i1; |
| long long int result; |
| long double w; |
| long double t; |
| int sx; |
| |
| GET_LDOUBLE_WORDS (se, i0, i1, x); |
| |
| sx = (se >> 15) & 1; |
| j0 = (se & 0x7fff) - 0x3fff; |
| |
| if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) |
| { |
| if (j0 >= 63) |
| result = (((long long int) i0 << 32) | i1) << (j0 - 63); |
| else |
| { |
| #if defined FE_INVALID || defined FE_INEXACT |
| /* X < LLONG_MAX + 1 implied by J0 < 63. */ |
| if (x > (long double) LLONG_MAX) |
| { |
| /* In the event of overflow we must raise the "invalid" |
| exception, but not "inexact". */ |
| t = __nearbyintl (x); |
| feraiseexcept (t == LLONG_MAX ? FE_INEXACT : FE_INVALID); |
| } |
| else |
| #endif |
| { |
| w = two63[sx] + x; |
| t = w - two63[sx]; |
| } |
| GET_LDOUBLE_WORDS (se, i0, i1, t); |
| j0 = (se & 0x7fff) - 0x3fff; |
| |
| if (j0 < 0) |
| result = 0; |
| else if (j0 <= 31) |
| result = i0 >> (31 - j0); |
| else |
| result = ((long long int) i0 << (j0 - 31)) | (i1 >> (63 - j0)); |
| } |
| } |
| else |
| { |
| /* The number is too large. It is left implementation defined |
| what happens. */ |
| return (long long int) x; |
| } |
| |
| return sx ? -result : result; |
| } |
| |
| libm_alias_ldouble (__llrint, llrint) |
