[tremor] [PATCH] 12% global performance gain on a StrongARM

[dilb]

> The attached patch provides a 12% performance gain on a StrongARM SA1110
> over current code in the CVS.  This is mostly C code shuffling so to help
> GCC produce nearly perfect assembly on ARM.  Probably a hand optimized
> assembly version of mdct.c could do even better, but I'll leave this task
> to others (Dilb?).  At least this will produce the best compiler generated
> reference to start with as well as improving performance for all
> architectures in general.

This is a nice improvement, "félicitation" :).
Currently, I'm working on ffmpeg's iDCT for ARM (the old one seems wrong), 
but, as I said, as soon as the mdct.c function will stabilize, I will update 
my assembly code.

Did you compare results between your favorite CFLAGS, and mine ?

> Nicolas
Dilb.
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