[vorbis-dev] alloca() problem with CodeWarrior

[Segher Boessenkool]

> This sounds amazingly fast .. you are actually cycle counting this and
> not using 3rd party cpu usage meters?

Yes of course.  Wall clock time / file length  works as well, btw.

> Just looking at something like
> mdct.c it seems the sheer number of multiplies makes it impossible to
> execute in 19 cycles without vectorizing it massively and doing the
> decode in a different way (im not sure how wide the powerpc is but I
> assume it is 128bit max).. this is your own private source branch right?

Yes.
For the standard 1024 samples block size, the mdct takes about 3.8 cycles
per output sample, on average.

<p>Segher

<p>--- >8 ----
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