| /* Round float to integer away from zero. |
| Copyright (C) 1997-2014 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 <math.h> |
| |
| #include <math_private.h> |
| |
| |
| static const float huge = 1.0e30; |
| |
| |
| float |
| __roundf (float x) |
| { |
| int32_t i0, j0; |
| |
| GET_FLOAT_WORD (i0, x); |
| j0 = ((i0 >> 23) & 0xff) - 0x7f; |
| if (j0 < 23) |
| { |
| if (j0 < 0) |
| { |
| math_force_eval (huge + x); |
| |
| i0 &= 0x80000000; |
| if (j0 == -1) |
| i0 |= 0x3f800000; |
| } |
| else |
| { |
| u_int32_t i = 0x007fffff >> j0; |
| if ((i0 & i) == 0) |
| /* X is integral. */ |
| return x; |
| math_force_eval (huge + x); |
| |
| /* Raise inexact if x != 0. */ |
| i0 += 0x00400000 >> j0; |
| i0 &= ~i; |
| } |
| } |
| else |
| { |
| if (j0 == 0x80) |
| /* Inf or NaN. */ |
| return x + x; |
| else |
| return x; |
| } |
| |
| SET_FLOAT_WORD (x, i0); |
| return x; |
| } |
| weak_alias (__roundf, roundf) |