| /* Round to int long double floating-point values. |
| IBM extended format long double version. |
| Copyright (C) 2006-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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/>. */ |
| |
| /* This has been coded in assembler because GCC makes such a mess of it |
| when it's coded in C. */ |
| |
| #include <math.h> |
| #include <math_ldbl_opt.h> |
| #include <float.h> |
| #include <ieee754.h> |
| |
| |
| long double |
| __roundl (long double x) |
| { |
| double xh, xl, hi, lo; |
| |
| ldbl_unpack (x, &xh, &xl); |
| |
| /* Return Inf, Nan, +/-0 unchanged. */ |
| if (__builtin_expect (xh != 0.0 |
| && __builtin_isless (__builtin_fabs (xh), |
| __builtin_inf ()), 1)) |
| { |
| hi = __round (xh); |
| if (hi != xh) |
| { |
| /* The high part is not an integer; the low part only |
| affects the result if the high part is exactly half way |
| between two integers and the low part is nonzero with the |
| opposite sign. */ |
| if (fabs (hi - xh) == 0.5) |
| { |
| if (xh > 0 && xl < 0) |
| xh = hi - 1; |
| else if (xh < 0 && xl > 0) |
| xh = hi + 1; |
| else |
| xh = hi; |
| } |
| else |
| xh = hi; |
| xl = 0; |
| } |
| else |
| { |
| /* The high part is a nonzero integer. */ |
| lo = __round (xl); |
| if (fabs (lo - xl) == 0.5) |
| { |
| if (xh > 0 && xl < 0) |
| xl = lo + 1; |
| else if (xh < 0 && lo > 0) |
| xl = lo - 1; |
| else |
| xl = lo; |
| } |
| else |
| xl = lo; |
| xh = hi; |
| ldbl_canonicalize_int (&xh, &xl); |
| } |
| } |
| else |
| /* Quiet signaling NaN arguments. */ |
| xh += xh; |
| |
| return ldbl_pack (xh, xl); |
| } |
| |
| long_double_symbol (libm, __roundl, roundl); |