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
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/* Inline math functions for s390.
Copyright (C) 2004, 2007 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _MATH_H
# error "Never use <bits/mathinline.h> directly; include <math.h> instead."
#endif
#ifndef __extern_inline
# define __MATH_INLINE __inline
#else
# define __MATH_INLINE __extern_inline
#endif
#if (!defined __NO_MATH_INLINES || defined __LIBC_INTERNAL_MATH_INLINES) \
&& defined __OPTIMIZE__
#ifdef __USE_ISOC99
/* Test for negative number. Used in the signbit() macro. */
__MATH_INLINE int
__NTH (__signbitf (float __x))
{
__extension__ union { float __f; int __i; } __u = { __f: __x };
return __u.__i < 0;
}
__MATH_INLINE int
__NTH (__signbit (double __x))
{
__extension__ union { double __d; long __i; } __u = { __d: __x };
return __u.__i < 0;
}
# ifndef __NO_LONG_DOUBLE_MATH
__MATH_INLINE int
__NTH (__signbitl (long double __x))
{
__extension__ union { long double __l; int __i[4]; } __u = { __l: __x };
return __u.__i[0] < 0;
}
# else
__MATH_INLINE int
__NTH (__signbitl (long double __x))
{
return __signbit ((double) __x);
}
# endif
#endif /* C99 */
/* This code is used internally in the GNU libc. */
#ifdef __LIBC_INTERNAL_MATH_INLINES
__MATH_INLINE double
__NTH (__ieee754_sqrt (double x))
{
double res;
asm ( "sqdbr %0,%1" : "=f" (res) : "f" (x) );
return res;
}
__MATH_INLINE float
__NTH (__ieee754_sqrtf (float x))
{
float res;
asm ( "sqebr %0,%1" : "=f" (res) : "f" (x) );
return res;
}
# if !defined __NO_LONG_DOUBLE_MATH
__MATH_INLINE long double
__NTH (sqrtl (long double __x))
{
long double res;
asm ( "sqxbr %0,%1" : "=f" (res) : "f" (__x) );
return res;
}
# endif /* !__NO_LONG_DOUBLE_MATH */
#endif /* __LIBC_INTERNAL_MATH_INLINES */
#endif /* __NO_MATH_INLINES */
|
