]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c
1 /* Return classification value corresponding to argument.
2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
5 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
23 #include <math_private.h>
24 #include <math_ldbl_opt.h>
28 * +NaN 7ffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
29 * -NaN fffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
30 * +Inf 7ff0 0000 0000 0000 xxxx xxxx xxxx xxxx
31 * -Inf fff0 0000 0000 0000 xxxx xxxx xxxx xxxx
32 * +0 0000 0000 0000 0000 xxxx xxxx xxxx xxxx
33 * -0 8000 0000 0000 0000 xxxx xxxx xxxx xxxx
34 * +normal 0360 0000 0000 0000 0000 0000 0000 0000 (smallest)
35 * -normal 8360 0000 0000 0000 0000 0000 0000 0000 (smallest)
36 * +normal 7fef ffff ffff ffff 7c8f ffff ffff fffe (largest)
37 * +normal ffef ffff ffff ffff fc8f ffff ffff fffe (largest)
38 * +denorm 0360 0000 0000 0000 8000 0000 0000 0001 (largest)
39 * -denorm 8360 0000 0000 0000 0000 0000 0000 0001 (largest)
40 * +denorm 000n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
41 * -denorm 800n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
45 ___fpclassifyl (long double x
)
48 int retval
= FP_NORMAL
;
51 ldbl_unpack (x
, &xhi
, &xlo
);
52 EXTRACT_WORDS64 (hx
, xhi
);
53 if ((hx
& 0x7ff0000000000000ULL
) == 0x7ff0000000000000ULL
) {
54 /* +/-NaN or +/-Inf */
55 if (hx
& 0x000fffffffffffffULL
) {
62 /* +/-zero or +/- normal or +/- denormal */
63 if (hx
& 0x7fffffffffffffffULL
) {
64 /* +/- normal or +/- denormal */
65 if ((hx
& 0x7ff0000000000000ULL
) > 0x0360000000000000ULL
) {
69 if ((hx
& 0x7ff0000000000000ULL
) == 0x0360000000000000ULL
) {
70 EXTRACT_WORDS64 (lx
, xlo
);
71 if ((lx
& 0x7fffffffffffffff) /* lower is non-zero */
72 && ((lx
^hx
) & 0x8000000000000000ULL
)) { /* and sign differs */
74 retval
= FP_SUBNORMAL
;
81 retval
= FP_SUBNORMAL
;
92 long_double_symbol (libm
, ___fpclassifyl
, __fpclassifyl
);
93 #ifdef __LONG_DOUBLE_MATH_OPTIONAL
94 libm_hidden_ver (___fpclassifyl
, __fpclassifyl
)
96 libm_hidden_def (__fpclassifyl
)