[PATCH 1/2][ARM] PR/65956 AAPCS update for alignment attribute

Eric Botcazou ebotcazou@adacore.com
Fri Nov 27 18:17:00 GMT 2015

> So, I'm not familiar with Ada 'fat pointers' but if that is one -
> well, it's a record, with an alignment that the 'new' AAPCS now
> ignores, so yes the ABI has changed between gcc 5.1 and 5.2, rather
> more significantly for Ada than for C.

Yes, XUP suffixed types are fat pointers and they are maximally aligned so 
that they can be given non-BLK mode and, consequently, live in registers.

> Thoughts?

There is no official ABI for Ada so I guess that's not really a problem as 
long as it's documented on https://gcc.gnu.org/gcc-5/changes.html.

Eric Botcazou

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