[Tremor] LOW_ACCURACY mode and MDCT improvements

[Daniel Kahn Gillmor]

[back on-list, i hope that's OK]

On 03/23/2010 01:00 PM, Mike Giacomelli wrote:
> Is _ARM_ASM defined?  Which -O2 right?

i'm using -O2.

i don't see any mention of _ARM_ASM in either the source or the build
logs.  Where should i be looking for it?  Where should i be setting it?

> FWIW I saw a speed up on x86-64, ARM922 and Cortex A8.  It was smaller then in rockbox
> but still several MHz in all cases.  I'm not sure why Rockbox seemed to benefit more, its
> possible we programmed towards our specific gcc version (4.0.3) a little too much and that
> tweaking the code could further improve things. 
> 
> Perhaps I should also port our ASM version of the current MDCT and see if that works better.

I'm up for trying other changes to see if i can coax a speedup out of
it, if you can point me in the right direction.

	--dkg

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