]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/sparc/sparc64/soft-fp/e_ilogbl.c
1 /* Software floating-point emulation.
3 Copyright (C) 1999, 2012 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Jakub Jelinek (jj@ultra.linux.cz).
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/>. */
21 /* ilogbl(long double x)
22 * return the binary exponent of non-zero x
23 * ilogbl(0) = 0x80000001
24 * ilogbl(inf/NaN) = 0x7fffffff (no signal is raised)
31 int __ieee754_ilogbl (long double x
)
49 FP_UNPACK_RAW_Q(X
, x
);
53 return X_e
- _FP_EXPBIAS_Q
;
55 #if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
56 if (_FP_FRAC_ZEROP_4(X
))
61 _FP_FRAC_CLZ_4(shift
, X
);
62 shift
-= _FP_FRACXBITS_Q
;
63 return X_e
- _FP_EXPBIAS_Q
- 1 + shift
;
66 if (_FP_FRAC_ZEROP_2(X
))
71 _FP_FRAC_CLZ_2(shift
, X
);
72 shift
-= _FP_FRACXBITS_Q
;
73 return X_e
- _FP_EXPBIAS_Q
- 1 + shift
;