On Tue, 19 Jun 2012, Richard Sandiford wrote: > Richard Guenther <rguent...@suse.de> writes: > > We are too eager to bump alignment of some decls when vectorizing. > > The fix is to not bump alignment of decls the user explicitely > > aligned or that are used in an unknown way. > > I thought attribute((__aligned__)) only set a minimum alignment > for variables? Most usees I've seen have been trying to get > better performance from higher alignment, so it might not go > down well if the attribute stopped the vectoriser from increasing > the alignment still further.
That's what the documentation says indeed. I'm not sure which part of the patch fixes the ObjC failures where the alignment is part of the ABI (and I suppose ObjC then mis-uses the aligned attribute?). Richard.
