[Bug target/48781] gcc generate movdqa instructions on unaligned memory address when using -mtune=native -march=native

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48781

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-04-26 22:30:00 UTC ---
(In reply to comment #2)
> (In reply to comment #1)
> > The alignment of __uint128_t is 16byte.  I think you are invoking undefined
> > behavior by using a data type which increases the alignment.
> 
> _uint128_t does not assume a 16-byte alignment, right? Maybe using (unsigned
> int *) for pointer 'data' is not an good example.

__uint128_t is a type which has 16byte alignment so yes GCC assumes 16byte
alignment.