[Mplayer-dev-eng] [PATCH] libac3 SSE support

[Felix Bьnemann]

Hello Nick,

Wednesday, July 11, 2001, 2:35:11 AM, you wrote:

NK> Hi, Felix Bьnemann!

NK> On 2001-07-10 10:29:35 you wrote:

>>NK> In attach SSE support for libac3.
>>NK> Please test it and apply if it works, otherwise - simply forget about.
>>
>>Great, it works (I've tested with 2.0 and 5.1 48kHz AC3) and it gives
>>speedup of approx 10-15% on PIII coppermine.
>>
>>Btw. grabbed pcm dump of output and it differs, but think it's due to
>>different srfft algorithm I think, I think it's no prob cause it
>>sounds ok (did diff of audiodump.wav of mplayer with --disable-sse and
>>--enable-sse).
>>
NK> The same problem was with old mp3 stuff, IMHO. It's normal since P3 has
NK> minor different precision for FPU and SSE units (I still don't study this question
NK> in detail). But problem is not in algorithms since there is used same algorithm
NK> for all types of decoders (SSE, 3DNOW).

NK> Maybe you'll want port dct64_3dnow.s (dct64_k7.s even better) to SSE as
NK> dct64_sse.s? At least phases 1-5? They can be simply converted from
NK> 3dnow to sse, but phases 6-10 could be interleaved with 1-5 to get better
NK> performance. (I think that per 1 SSE opcodes need 2 FPU opcodes to load
NK> cpu optimally).
of course I'd like to, question is if I manage, think I'll get the
basic stuff, but some of the complex instructions sometimes confuse
me.
But I'll take a look at it.

Btw. how are instructions with 3 parameters converted from intel to
at&t syntax?

NK> Best regards! Nick (2001-07-11 00:27:43)

-- 
Best regards,
 Felix                            mailto:atmosfear at users.sourceforge.net



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