[FFmpeg-devel] FFMpeg on SH4 (STi7109)

Måns Rullgård mans
Wed Nov 19 10:36:16 CET 2008

Reimar D?ffinger <Reimar.Doeffinger at stud.uni-karlsruhe.de> writes:

> On Wed, Nov 19, 2008 at 12:54:55AM +0000, M?ns Rullg?rd wrote:
>> Could I ask you to run some simple benchmarks with and without the
>> functions from qpel.c and dsputil_align.c?  I have the feeling those
>> optimisations are not all that optimal when all comes around.  A
>> comment in qpel.c talks about *p++ vs. p[n] to access arrays, and most
>> functions in this file seem to be the plain C functions rewritten to
>> use *p++ access.  There is, however, very little difference in the
>> generated code.
> I have the feeling that might be because some (probably all) sh4
> compilers really suck(ed) very much.
> IIRC the last time SH4 came up here was because some compiler
> miscompiled half of FFmpeg...

The SH4 build has been broken since 2003...

M?ns Rullg?rd
mans at mansr.com

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