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29cb9293 | 1 | /* Test whether long double value is canonical. ldbl-96 version. |
6d7e8eda | 2 | Copyright (C) 2016-2023 Free Software Foundation, Inc. |
29cb9293 JM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
29cb9293 JM |
18 | |
19 | #include <float.h> | |
20 | #include <math.h> | |
21 | #include <math_private.h> | |
22 | #include <stdbool.h> | |
23 | #include <stdint.h> | |
24 | ||
25 | int | |
26 | __iscanonicall (long double x) | |
27 | { | |
28 | uint32_t se, i0, i1 __attribute__ ((unused)); | |
29 | ||
30 | GET_LDOUBLE_WORDS (se, i0, i1, x); | |
31 | int32_t ix = se & 0x7fff; | |
32 | bool mant_high = (i0 & 0x80000000) != 0; | |
33 | ||
34 | if (LDBL_MIN_EXP == -16381) | |
35 | /* Intel variant: the high mantissa bit should have a value | |
36 | determined by the exponent. */ | |
37 | return ix > 0 ? mant_high : !mant_high; | |
38 | else | |
39 | /* M68K variant: both values of the high bit are valid for the | |
40 | greatest and smallest exponents, while other exponents require | |
41 | the high bit to be set. */ | |
42 | return ix == 0 || ix == 0x7fff || mant_high; | |
43 | } | |
eaf5ad0b | 44 | libm_hidden_def (__iscanonicall) |