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Kernel with or without NEON / THUMBEE support

Arno Steffens
Intellectual 930 points

Other Parts Discussed in Thread: OMAP3503

I did compile my kernel with Thumbee and Neon Support as described in a message here before.

One thing: I don't get the features via "cat /proc/cpuinfo"

The question: is it just a missing in cpuinfo or isn't it build in?

To find out I tested a small NEON application:

(with commands like vdup_n_u32)

I could compile and it even runs on target (Omap3503). Is it proof that it is really working with NEON, not just emulating it?

I am not sure, because It also runs on a kernel with NEON option switched off ?!?

Now I am really confused. What's going on?

(Kernel is 2.6.28 with 2009q1 lite CS toolchain)

  • 0
    Intellectual 930 points

    Did have a look at this:

    http://wiki.davincidsp.com/index.php/Cortex_A8

    I do have same relations as described between vfp and neo, but it takes around 3 times as long (3/25s for 500.000 calls).

    What can be the reason for that? Did use the same compiler, options and clockrate.

    VFP 7.36 seconds
    Neon 0.94 seconds