]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/ldbl-128ibm/s_setpayloadl_main.c
1 /* Set NaN payload. ldbl-128ibm version.
2 Copyright (C) 2016-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
20 #include <math_private.h>
21 #include <nan-high-order-bit.h>
24 #define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG)
26 #define PAYLOAD_DIG 51
27 #define EXPLICIT_MANT_DIG 52
30 FUNC (long double *x
, long double payload
)
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)
52 hx
&= (1ULL << EXPLICIT_MANT_DIG
) - 1;
53 hx
|= 1ULL << EXPLICIT_MANT_DIG
;
54 hx
>>= BIAS
+ EXPLICIT_MANT_DIG
- exponent
;
56 hx
|= 0x7ff0000000000000ULL
| (SET_HIGH_BIT
? 0x8000000000000ULL
: 0);
57 INSERT_WORDS64 (hi
, hx
);
58 *x
= ldbl_pack (hi
, 0.0);