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Linshizhi
ffmpeg.wasm-core
Commits
1db8c21c
Commit
1db8c21c
authored
Jan 31, 2007
by
Reimar Döffinger
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Optimize LZO copy operations
Originally committed as revision 7784 to
svn://svn.ffmpeg.org/ffmpeg/trunk
parent
ff3dac65
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1 changed file
with
20 additions
and
16 deletions
+20
-16
lzo.c
libavcodec/lzo.c
+20
-16
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libavcodec/lzo.c
View file @
1db8c21c
...
...
@@ -66,6 +66,19 @@ static inline int get_len(LZOContext *c, int x, int mask) {
return
cnt
;
}
//#define UNALIGNED_LOADSTORE
#define BUILTIN_MEMCPY
#ifdef UNALIGNED_LOADSTORE
#define COPY2(d, s) *(uint16_t *)(d) = *(uint16_t *)(s);
#define COPY4(d, s) *(uint32_t *)(d) = *(uint32_t *)(s);
#elif defined(BUILTIN_MEMCPY)
#define COPY2(d, s) memcpy(d, s, 2);
#define COPY4(d, s) memcpy(d, s, 4);
#else
#define COPY2(d, s) (d)[0] = (s)[0]; (d)[1] = (s)[1];
#define COPY4(d, s) (d)[0] = (s)[0]; (d)[1] = (s)[1]; (d)[2] = (s)[2]; (d)[3] = (s)[3];
#endif
/**
* \brief copy bytes from input to output buffer with checking
* \param cnt number of bytes to copy, must be > 0
...
...
@@ -82,10 +95,7 @@ static inline void copy(LZOContext *c, int cnt) {
c
->
error
|=
LZO_OUTPUT_FULL
;
}
#if defined(INBUF_PADDED) && defined(OUTBUF_PADDED)
dst
[
0
]
=
src
[
0
];
dst
[
1
]
=
src
[
1
];
dst
[
2
]
=
src
[
2
];
dst
[
3
]
=
src
[
3
];
COPY4
(
dst
,
src
);
src
+=
4
;
dst
+=
4
;
cnt
-=
4
;
...
...
@@ -120,22 +130,16 @@ static inline void copy_backptr(LZOContext *c, int back, int cnt) {
dst
+=
cnt
;
}
else
{
#ifdef OUTBUF_PADDED
dst
[
0
]
=
src
[
0
];
dst
[
1
]
=
src
[
1
];
dst
[
2
]
=
src
[
2
];
dst
[
3
]
=
src
[
3
];
COPY2
(
dst
,
src
);
COPY2
(
dst
+
2
,
src
+
2
);
src
+=
4
;
dst
+=
4
;
cnt
-=
4
;
if
(
cnt
>
0
)
{
dst
[
0
]
=
src
[
0
];
dst
[
1
]
=
src
[
1
];
dst
[
2
]
=
src
[
2
];
dst
[
3
]
=
src
[
3
];
dst
[
4
]
=
src
[
4
];
dst
[
5
]
=
src
[
5
];
dst
[
6
]
=
src
[
6
];
dst
[
7
]
=
src
[
7
];
COPY2
(
dst
,
src
);
COPY2
(
dst
+
2
,
src
+
2
);
COPY2
(
dst
+
4
,
src
+
4
);
COPY2
(
dst
+
6
,
src
+
6
);
src
+=
8
;
dst
+=
8
;
cnt
-=
8
;
...
...
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