http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54779
--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> --- Created attachment 31402 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31402&action=edit Patch detaching arrays away from aggregates Eric, to what extent would this patch suffice? It detects situations when an array is the only thing preventing a local scalar from being totally replaced disappearing and if it also complies with a number of conditions (most importantly, it must not be accessed as whole, only its elements), it creates a separate array and changes all array references to use that. While it most certainly isn't as powerful as your specialized patch, it also works on non-FRAMEs and is good enough to break them up in your testcase (and its slightly more complex variant included as the second testcase in the patch). The patch is fairly simple because it only deals with so called non-scalarizable regions which other parts of SRA stay away from. In theory we could detach each independently accessed part of an aggregate but that would require rewriting the ugliest parts of the pass (and not really making them any clearer), hence the question at the top of my post.
