Re: [PATCH 0/1] Change default for cortexa* to armv7at-neon.

[Martin Jansa <martin.jansa@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1132 bytes --]

On Fri, Aug 22, 2014 at 01:33:49PM -0500, Peter Seebach wrote:
> On Fri, 22 Aug 2014 10:44:32 -0600
> Philip Balister <philip@balister.org> wrote:
> 
> > Can we also move to hard float abi?
> 
> I'd rather not, just because the reason I care about this at all is that our
> prebuilt toolchain has a set of binaries for armv7at-neon, but not for hard
> float ABI.
> 
> I am reminded, though, of a question I had about all the cortex tunings:
> 
> Why do they set DEFAULTTUNE to a tuning that isn't one of the ones using the
> new features they define?

Because it's always compromise between optimizing for given device and
sharing the same DEFAULTTUNE (and its binary feed) for many MACHINEs supported
by DISTRO.

Even enabling thumb seems wrong, because ARM_INSTRUCTION_SET is arm by
default, so this change is only renaming the feed, but still building
the same binaries (unless distro sets ARM_INSTRUCTION_SET).

Please check this old RFC for more details:
https://www.mail-archive.com/openembedded-core@lists.openembedded.org/msg28907.html

-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa@gmail.com

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 188 bytes --]