[mythtv] [mythtv-commits] Ticket #5890: libmythsoundtouch: SIMD optimisation patch

[John P Poet]

On Sat, Nov 8, 2008 at 8:17 AM, MythTV <mythtv at cvs.mythtv.org> wrote:
> #5890: libmythsoundtouch: SIMD optimisation patch
> ------------------------------+---------------------------------------------
>  Reporter:  foobum at gmail.com  |       Owner:  ijr
>     Type:  patch             |      Status:  new
>  Priority:  minor             |   Milestone:  unknown
> Component:  mythtv            |     Version:  head
>  Severity:  medium            |     Mlocked:  0
> ------------------------------+---------------------------------------------
>  The MMX optimised routines in libmythsoundtouch appear to be disabled
>  since ALLOW_MMX is never defined. Also, the MMX routines were explicitly
>  disabled for x86_64 since they give garbled output on that arch. This
>  patch:
>
>  * Defines ALLOW_MMX in soundtouch if (arch == x86 && defined(MMX))[[BR]]
>  * Adds integer SSE2 routines for x86_64
>
>  This results in a huge speed increase - enough to make 1.2x possible with
>  1080i mpeg2 and 6ch AC-3 audio on a 2.2Ghz amd64 with cycles to spare.
>
>  Tested on x86_64 only. Patch applies against fixes and trunk.
>
> --
> Ticket URL: <http://svn.mythtv.org/trac/ticket/5890>
> MythTV <http://www.mythtv.org/>
> MythTV

Truly serendipitous timing!  I had forgotten why I had stuck with a
32bit install, and just got through install the 64 bit version of F9.
Timestretch caused some stuttering, and I was having a hard time
figuring out why.  I had forgotten that timestretch was missing those
optimizations with 64bit.

This patches fixes the problem nicely.  Thank you.

John
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