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eb3c12c7 | 1 | /* Set NaN payload. ldbl-128ibm version. |
d614a753 | 2 | Copyright (C) 2016-2020 Free Software Foundation, Inc. |
eb3c12c7 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/>. */ |
eb3c12c7 JM |
18 | |
19 | #include <math.h> | |
20 | #include <math_private.h> | |
21 | #include <nan-high-order-bit.h> | |
22 | #include <stdint.h> | |
23 | ||
24 | #define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG) | |
25 | #define BIAS 0x3ff | |
26 | #define PAYLOAD_DIG 51 | |
27 | #define EXPLICIT_MANT_DIG 52 | |
28 | ||
29 | int | |
30 | FUNC (long double *x, long double payload) | |
31 | { | |
32 | double hi, lo; | |
33 | uint64_t hx, lx; | |
34 | ||
35 | ldbl_unpack (payload, &hi, &lo); | |
36 | EXTRACT_WORDS64 (hx, hi); | |
37 | EXTRACT_WORDS64 (lx, lo); | |
38 | int exponent = hx >> EXPLICIT_MANT_DIG; | |
39 | /* Test if argument is (a) negative or too large; (b) too small, | |
40 | except for 0 when allowed; (c) not an integer. All valid | |
41 | arguments have the low part zero. */ | |
42 | if ((lx & 0x7fffffffffffffffULL) != 0 | |
43 | || exponent >= BIAS + PAYLOAD_DIG | |
44 | || (exponent < BIAS && !(SET_HIGH_BIT && hx == 0)) | |
45 | || (hx & ((1ULL << (BIAS + EXPLICIT_MANT_DIG - exponent)) - 1)) != 0) | |
46 | { | |
47 | *x = 0.0L; | |
48 | return 1; | |
49 | } | |
50 | if (hx != 0) | |
51 | { | |
52 | hx &= (1ULL << EXPLICIT_MANT_DIG) - 1; | |
53 | hx |= 1ULL << EXPLICIT_MANT_DIG; | |
54 | hx >>= BIAS + EXPLICIT_MANT_DIG - exponent; | |
55 | } | |
56 | hx |= 0x7ff0000000000000ULL | (SET_HIGH_BIT ? 0x8000000000000ULL : 0); | |
57 | INSERT_WORDS64 (hi, hx); | |
58 | *x = ldbl_pack (hi, 0.0); | |
59 | return 0; | |
60 | } |