Libav
Main Page
Related Pages
Modules
Data Structures
Files
Examples
File List
Globals
libavcodec
x86
mathops.h
Go to the documentation of this file.
1
/*
2
* simple math operations
3
* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
4
*
5
* This file is part of Libav.
6
*
7
* Libav 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.
11
*
12
* Libav 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.
16
*
17
* You should have received a copy of the GNU Lesser General Public
18
* License along with Libav; if not, write to the Free Software
19
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
*/
21
22
#ifndef AVCODEC_X86_MATHOPS_H
23
#define AVCODEC_X86_MATHOPS_H
24
25
#include "config.h"
26
#include "
libavutil/common.h
"
27
28
#if HAVE_INLINE_ASM
29
30
#if ARCH_X86_32
31
32
#define MULL MULL
33
static
av_always_inline
av_const
int
MULL
(
int
a
,
int
b
,
unsigned
shift)
34
{
35
int
rt, dummy;
36
__asm__ (
37
"imull %3 \n\t"
38
"shrdl %4, %%edx, %%eax \n\t"
39
:
"=a"
(rt),
"=d"
(dummy)
40
:
"a"
(a),
"rm"
(b),
"ci"
((
uint8_t
)shift)
41
);
42
return
rt;
43
}
44
45
#define MULH MULH
46
static
av_always_inline
av_const
int
MULH
(
int
a,
int
b)
47
{
48
int
rt, dummy;
49
__asm__ (
50
"imull %3"
51
:
"=d"
(rt),
"=a"
(dummy)
52
:
"a"
(a),
"rm"
(b)
53
);
54
return
rt;
55
}
56
57
#define MUL64 MUL64
58
static
av_always_inline
av_const
int64_t
MUL64
(
int
a,
int
b)
59
{
60
int64_t rt;
61
__asm__ (
62
"imull %2"
63
:
"=A"
(rt)
64
:
"a"
(a),
"rm"
(b)
65
);
66
return
rt;
67
}
68
69
#endif
/* ARCH_X86_32 */
70
71
#if HAVE_I686
72
/* median of 3 */
73
#define mid_pred mid_pred
74
static
inline
av_const
int
mid_pred
(
int
a,
int
b,
int
c)
75
{
76
int
i=
b
;
77
__asm__ (
78
"cmp %2, %1 \n\t"
79
"cmovg %1, %0 \n\t"
80
"cmovg %2, %1 \n\t"
81
"cmp %3, %1 \n\t"
82
"cmovl %3, %1 \n\t"
83
"cmp %1, %0 \n\t"
84
"cmovg %1, %0 \n\t"
85
:
"+&r"
(i),
"+&r"
(a)
86
:
"r"
(b),
"r"
(c)
87
);
88
return
i;
89
}
90
91
#define COPY3_IF_LT(x, y, a, b, c, d)\
92
__asm__ volatile(\
93
"cmpl %0, %3 \n\t"\
94
"cmovl %3, %0 \n\t"\
95
"cmovl %4, %1 \n\t"\
96
"cmovl %5, %2 \n\t"\
97
: "+&r" (x), "+&r" (a), "+r" (c)\
98
: "r" (y), "r" (b), "r" (d)\
99
);
100
#endif
/* HAVE_I686 */
101
102
#define MASK_ABS(mask, level) \
103
__asm__ ("cltd \n\t" \
104
"xorl %1, %0 \n\t" \
105
"subl %1, %0 \n\t" \
106
: "+a"(level), "=&d"(mask))
107
108
// avoid +32 for shift optimization (gcc should do that ...)
109
#define NEG_SSR32 NEG_SSR32
110
static
inline
int32_t
NEG_SSR32
(
int32_t
a, int8_t s){
111
__asm__ (
"sarl %1, %0\n\t"
112
:
"+r"
(a)
113
:
"ic"
((
uint8_t
)(-s))
114
);
115
return
a
;
116
}
117
118
#define NEG_USR32 NEG_USR32
119
static
inline
uint32_t
NEG_USR32
(uint32_t a, int8_t s){
120
__asm__ (
"shrl %1, %0\n\t"
121
:
"+r"
(a)
122
:
"ic"
((
uint8_t
)(-s))
123
);
124
return
a
;
125
}
126
127
#endif
/* HAVE_INLINE_ASM */
128
#endif
/* AVCODEC_X86_MATHOPS_H */
MUL64
#define MUL64(a, b)
Definition:
mathops.h:51
av_const
#define av_const
Definition:
attributes.h:60
uint8_t
uint8_t
Definition:
audio_convert.c:194
b
#define b
Definition:
input.c:52
NEG_SSR32
#define NEG_SSR32(a, s)
Definition:
mathops.h:155
NEG_USR32
#define NEG_USR32(a, s)
Definition:
mathops.h:159
int32_t
int32_t
Definition:
audio_convert.c:194
mid_pred
#define mid_pred
Definition:
mathops.h:94
common.h
common internal and external API header
MULL
#define MULL(a, b, s)
Definition:
mathops.h:55
av_always_inline
#define av_always_inline
Definition:
attributes.h:40
MULH
#define MULH(X, Y)
Definition:
mathops.h:27
a
a
Definition:
h264pred_template.c:466
Generated on Mon Aug 4 2014 17:22:59 for Libav by
1.8.7