| /* Test whether long double value is canonical. ldbl-96 version. |
| Copyright (C) 2016-2018 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/>. */ |
| |
| #include <float.h> |
| #include <math.h> |
| #include <math_private.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| |
| int |
| __iscanonicall (long double x) |
| { |
| uint32_t se, i0, i1 __attribute__ ((unused)); |
| |
| GET_LDOUBLE_WORDS (se, i0, i1, x); |
| int32_t ix = se & 0x7fff; |
| bool mant_high = (i0 & 0x80000000) != 0; |
| |
| if (LDBL_MIN_EXP == -16381) |
| /* Intel variant: the high mantissa bit should have a value |
| determined by the exponent. */ |
| return ix > 0 ? mant_high : !mant_high; |
| else |
| /* M68K variant: both values of the high bit are valid for the |
| greatest and smallest exponents, while other exponents require |
| the high bit to be set. */ |
| return ix == 0 || ix == 0x7fff || mant_high; |
| } |
| libm_hidden_def (__iscanonicall) |
