[Buildroot] [PATCH 3/7 v6] package/fftw: add ARM optimisations

Thomas Petazzoni thomas.petazzoni at free-electrons.com
Mon Mar 16 14:51:27 UTC 2015

Dear Yann E. MORIN,

On Mon, 16 Mar 2015 15:32:04 +0100, Yann E. MORIN wrote:

> That's what I initially tried, but it did not work, as fftw compiles
> parts of its code without specifying -mfpu=neon, and thus it falls to
> the value specified by Buildroot, and the compilation breaks.

In this case, pass -mfpu=neon explicitly, like we do in mplayer and
vo-aacenc. Using NEON as the general purpose FPU is quite unlikely,
since using NEON for FPU is not IEEE 754. So most likely people will
use VFPv3/4 as the FPU, but may be interested in using NEON for
specific things.

Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering

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