PowerPC malloc alignment

[Wolfram Gloger]

Hi,

> The introduction of 128-bit long double is a relatively recent ABI
> change (within the past two years, and not entirely universal yet).

Ok.  Changing the ABI should really entail a new libc, or at least
people shouldn't be surprised when they face problems when mixing old
and new binaries.

> 16-byte vectors are also relatively new, though I suspect people
> writing vector code have been trained to use posix_memalign to avoid
> trouble.

Those aren't standard C types, so IMHO using posix_memalign is the way
to go.  But long double is different of course.

Regards,
Wolfram.