[opus] [Opus] [Patch]01-Add ARM5E macros

[Timothy B. Terriberry]

Timothy B. Terriberry wrote:
> Aurélien Zanelli wrote:
>> Also, if you have any question or comment about it, feel free to contact
>> me.
>
> A lot of these macros consist of a single ARM instruction, yet specify
> an early clobber constraint for the output. Is that intentional?

Apparently it was Jean-Marc who added those constraints in the original 
file in libspeex (though he couldn't remember why). In any case, I 
committed a modified version of your patch:

https://git.xiph.org/?p=opus.git;a=commitdiff;h=972a34ec

Total speed up was 22.3% on test_opus_encoder on a 600 MHz Cortex A8 
using gcc 4.2.1 (there are probably more representative tests and 
certainly better compilers, but that should give an idea of the ballpark).