]>
Commit | Line | Data |
---|---|---|
04277e02 | 1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. |
28c50ce9 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
3214b89b AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28c50ce9 UD |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3214b89b | 12 | Lesser General Public License for more details. |
28c50ce9 | 13 | |
3214b89b | 14 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
15 | License along with the GNU C Library. If not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28c50ce9 | 17 | |
501ee116 | 18 | #include <math.h> |
5da9d124 | 19 | #include "mathimpl.h" |
501ee116 | 20 | |
3fe40928 UD |
21 | #ifndef SUFF |
22 | #define SUFF | |
863a5d82 RM |
23 | #endif |
24 | #ifndef float_type | |
25 | #define float_type double | |
26 | #endif | |
27 | ||
3fe40928 UD |
28 | #define CONCATX(a,b) __CONCAT(a,b) |
29 | #define s(name) CONCATX(name,SUFF) | |
30 | #define m81(func) __m81_u(s(func)) | |
863a5d82 | 31 | |
501ee116 | 32 | int |
860d60c1 | 33 | s(__ieee754_ilogb) (float_type x) |
501ee116 | 34 | { |
3fe40928 UD |
35 | float_type result; |
36 | unsigned long x_cond; | |
37 | ||
38 | x_cond = __m81_test (x); | |
39 | /* We must return consistent values for zero and NaN. */ | |
40 | if (x_cond & __M81_COND_ZERO) | |
41 | return FP_ILOGB0; | |
42 | if (x_cond & (__M81_COND_NAN | __M81_COND_INF)) | |
43 | return FP_ILOGBNAN; | |
44 | ||
45 | __asm ("fgetexp%.x %1, %0" : "=f" (result) : "f" (x)); | |
46 | return (int) result; | |
501ee116 | 47 | } |