On 5 May 2011 15:21, Christian Robottom Reis email@example.com wrote:
I was asked today in the board meeting about the use of NEON routines in the kernel; I said we had looked into this but hadn't done it because a) it wasn't conclusively better and b) if better, it would need to be done conditionally per-platform. But I wanted to double-check that's actually true (and I'm copying Vijay to keep me honest). I have some references:
Not quite: a) Neon memcpy/memset is worse on A9 than non-neon versions (better on A8 typically) b) In general I don't believe fpu or Neon code can be used internally to the kernel.
There may be the potential still for non-neon optimised memcpy/memset for Cortex a9; however the kernel routines are pretty good.
Incidentally, this ties into the question sent earlier this week which had to do with Nico's work item in:
Which IIRC Nico says probably isn't worth it, right?
I thought dmart had done a lot of that?