[Bug target/56564] movdqa on possibly-8-byte-aligned struct with -O3

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56564

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-03-08 11:35:36 UTC ---
Guess we'd need to split DATA_ALIGNMENT into two different macros (or one with
an extra argument), so that align_variable would know what alignment is part of
ABI and what is just an optimization above that, then align_variable could call
targetm.binds_local_p to see if DECL_ALIGN can be increased to the optimization
level or needs to stay at the ABI guaranteed level.  And then when assembling
vars, we'd increase the emitted alignment to the optimization level.