[PATCH, ARM] Don't use NEON for autovectorization in big-endian mode

[Julian Brown]

On Mon, 16 Jun 2014 12:42:36 +0100
Julian Brown <julian@codesourcery.com> wrote:

> Hi,
> 
> As discussed several times previously, support for NEON in ARM
> big-endian mode is quite broken because of differing assumptions about
> lane ordering made by the ARM EABI and the set of NEON intrinsics on
> the one hand, and the vectorizer on the other.
> 
> Fixing this "properly" would involve quite a large overhaul of the
> NEON backend implementation, and such an overhaul does not appear to
> be forthcoming. Unfortunately this leaves big-endian mode with a
> problem: even if the user is not explicitly using NEON intrinsics,
> compiling with NEON and the vectorizer enabled (i.e. -O3) can quite
> easily lead to incorrect code being generated.
> 
> This is the patch we've been using internally for a while to work
> around the problem. When applied:

Ping?

Julian