[Tremor] LOW_ACCURACY mode and MDCT improvements

[Mike Giacomelli]

 > I have opened a trac ticket (#1690) with a patch attached.>
 > The patch detects ARM target using __arm__ define of gcc.
 >
 > If the compiler isn't gcc, it uses the more permissive mask: arm*
 > instead of arm-*



 Good idea.  Detection of an ARM CPU core seems to be a serious problem for various companies using Tremor.  I've seen some shipping battery powered ARM devices using plain c for everything (!)


 I've updated the patch to have proper SVN properties, and to not include one of the .lo files by mistake.

 

http://duke.edu/~mgg6/rockbox/tremor_ffmpeg_imdctv8.patch




 Dave and others have confirmed this is on the order of 10% faster on various arm9 and cortex family CPUs, and probably a lot faster on arm7 given our experience in rockbox.  Unless someone finds some other mistake, I'll open a ticket for it.


 Mike

 		 	   		  
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