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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/* Copyright (C) 1997 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#define __LIBC_M81_MATH_INLINES
#include <math.h>
#include "math_private.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))
float_type
s(__ieee754_pow) (float_type x, float_type y)
{
float_type z;
float_type ax;
if (y == 0.0)
return 1.0;
if (x != x || y != y)
return x + y;
if (m81(__isinf) (y))
{
ax = s(fabs) (x);
if (ax == 1)
return 0.0/0.0;
if (ax > 1)
return y > 0 ? y : 0;
else
return y < 0 ? -y : 0;
}
if (s(fabs) (y) == 1)
return y > 0 ? x : 1 / x;
if (y == 2)
return x * x;
if (y == 0.5 && x >= 0)
return m81(__ieee754_sqrt) (x);
if (x == 10.0)
{
__asm ("ftentox%.x %1, %0" : "=f" (z) : "f" (y));
return z;
}
if (x == 2.0)
{
__asm ("ftwotox%.x %1, %0" : "=f" (z) : "f" (y));
return z;
}
ax = s(fabs) (x);
if (m81(__isinf) (x) || x == 0 || ax == 1)
{
z = ax;
if (y < 0)
z = 1 / z;
if (m81(__signbit) (x))
{
float_type temp = m81(__rint) (y);
if (y != temp)
{
if (x == -1)
z = 0.0/0.0;
}
else
{
if (sizeof (float_type) == sizeof (float))
{
long i = (long) y;
if (i & 1)
z = -z;
}
else
{
long long i = (long long) y;
if ((float_type) i == y && i & 1)
z = -z;
}
}
}
return z;
}
if (x < 0.0)
{
float_type temp = m81(__rint) (y);
if (y == temp)
{
long long i = (long long) y;
z = m81(__ieee754_exp) (y * m81(__ieee754_log) (-x));
if (sizeof (float_type) == sizeof (float))
{
long i = (long) y;
if (i & 1)
z = -z;
}
else
{
/* If the conversion to long long was inexact assume that y
is an even integer. */
if ((float_type) i == y && i & 1)
z = -z;
}
}
else
z = 0.0/0.0;
}
else
z = m81(__ieee754_exp) (y * m81(__ieee754_log) (x));
return z;
}
|
