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N
ffmpeg-0.6.3
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${ noResults }
4 Commits (8bd6f88266740068415f7da0628117f1b802efb9)
| Author | SHA1 | Message | Date |
|---|---|---|---|
Christophe Gisquet
|
4cb6964244 |
dcadec: simplify decoding of VQ high frequencies
The vector dequantization has a test in a loop preventing effective SIMD
implementation. By moving it out of the loop, this loop can be DSPized.
Therefore, modify the current DSP implementation. In particular, the
DSP implementation no longer has to handle null loop sizes.
The decode_hf implementations have following timings:
For x86 Arrandale:
C SSE SSE2 SSE4
win32: 260 162 119 104
win64: 242 N/A 89 72
The arm NEON optimizations follow in a later patch as external asm. The
now unused check for the y modifier in arm inline asm is removed from
configure.
|
11 years ago |
|
Christophe Gisquet
|
08e3ea60ff |
x86: synth filter float: implement SSE2 version
Timings for Arrandale:
C SSE
win32: 2108 334
win64: 1152 322
Factorizing the inner loop with a call/jmp is a >15 cycles cost, even with
the jmp destination being aligned.
Unrolling for ARCH_X86_64 is a 20 cycles gain.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>
|
11 years ago |
|
Christophe Gisquet
|
ad507d7907 |
x86: dcadsp: implement SSE lfe_dir
Results for Arrandale/Windows: 32: 1670 -> 316 64: 728 -> 298 Signed-off-by: Janne Grunau <janne-libav@jannau.net> |
11 years ago |
|
Christophe Gisquet
|
5b59a9fc61 |
x86: dcadsp: implement int8x8_fmul_int32
For the callable function (as opposed to the inline one):
C SSE SSE2 SSE4
Win32: 47 42 29 26
Win64: 30 33 25 23
The SSE version is neither compiled nor set for ARCH_X86_64, as the
inlinable function takes over.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>
|
11 years ago |