http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48377
--- Comment #33 from rguenther at suse dot de <rguenther at suse dot de> 2011-04-07 13:57:09 UTC --- On Thu, 7 Apr 2011, jakub at gcc dot gnu.org wrote: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48377 > > --- Comment #32 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-04-07 > 13:43:47 UTC --- > Given that without vectorization that code surely works well on all the weird > ABIs, such ADJUST_FIELD_ALIGN is used only on targets that either aren't > strict > alignment targets, or aren't strict alignment targets for the particular > types. > You know, for most CPUs strict alignment isn't a binary thing, many targets > including i?86/x86_64 are only partially strict alignment targets. > Even for targets where say int needs to be accessed aligned often e.g. double > can be just 4 byte aligned and insns that read/write doubles handle it. > > We really shouldn't change __alignof__ of types/INDIRECT_REFs/etc., those are > all ABI changes. The problem with vectorization is that often the vectors > have > strict alignment, while non-vector ops are not. Sure, I agree with all of the above. Still, if we need target hooks for this kind of stuff then something is really rotten in the middle-end. Richard.
