[vlc-devel] [vlc-commits] Avcodec: set the dsp_mask for NEON too

Jean-Baptiste Kempf jb at videolan.org
Tue Oct 2 00:57:33 CEST 2012

On Mon, Oct 01, 2012 at 11:45:40PM +0100, Måns Rullgård wrote :
> Because runtime CPU detection on ARM is not generally possible (some
> systems expose a subset of the information we need), we rely on probing
> the compiler settings to determine which code to build and use.

The information of having NEON or not is not enough?

> Furthermore, even if runtime detection is possible, you still want to
> build with the compiler flags best matching the target device.  Compared
> to x86, much greater gains are made in plain C code when building for
> the actual target hardware rather than something less capable.

Sure, but can't one do a "average" binary (not best match) to work on
all cortex-a8 and a9 and just activate NEON code when a NEON fpu is present?
Or am I too naive?

Thanks a lot.

Best regards,

Jean-Baptiste Kempf
http://www.jbkempf.com/ - +33 672 704 734
Sent from my Electronic Device

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