blob: e1cb2938bfaa663dd123215edde041157087d423 (
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
|
/* Copyright (C) 1996-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<http://www.gnu.org/licenses/>. */
#include <math.h>
#include "mathimpl.h"
#ifndef SUFF
#define SUFF
#endif
#ifndef float_type
#define float_type double
#endif
#define CONCATX(a,b) __CONCAT(a,b)
#define s(name) CONCATX(name,SUFF)
#define m81(func) __m81_u(s(func))
int
s(__ieee754_ilogb) (float_type x)
{
float_type result;
unsigned long x_cond;
x_cond = __m81_test (x);
/* We must return consistent values for zero and NaN. */
if (x_cond & __M81_COND_ZERO)
return FP_ILOGB0;
if (x_cond & (__M81_COND_NAN | __M81_COND_INF))
return FP_ILOGBNAN;
__asm ("fgetexp%.x %1, %0" : "=f" (result) : "f" (x));
return (int) result;
}
|
