blob: e14be971e92313f1f7c4fd61e3ee770f5228a4b2 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/* Software floating-point emulation.
Return !a
Copyright (C) 1997-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson (rth@cygnus.com) and
Jakub Jelinek (jj@ultra.linux.cz).
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
<https://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "quad.h"
long double _Q_neg(const long double a)
{
union {
long double ldbl;
UWtype words[4];
} c;
c.ldbl = a;
#if (__BYTE_ORDER == __BIG_ENDIAN)
c.words[0] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
#elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 64)
c.words[1] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
#elif (__BYTE_ORDER == __LITTLE_ENDIAN) && (W_TYPE_SIZE == 32)
c.words[3] ^= (((UWtype)1) << (W_TYPE_SIZE - 1));
#else
FP_DECL_Q(A); FP_DECL_Q(C);
FP_UNPACK_RAW_Q(A, a);
FP_NEG_Q(C, A);
FP_PACK_RAW_Q(c.ldbl, C);
#endif
return c.ldbl;
}
|
