https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78812
--- Comment #6 from rguenther at suse dot de <rguenther at suse dot de> --- On Fri, 16 Dec 2016, jakub at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78812 > > --- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- > (In reply to Richard Biener from comment #4) > > Can't we insert on the edge and commit edge insertions late? Or simply > > split the block for this case? > > Well, for the case of calls there typically are 2 edges, not just one (the > abnormal one and normal fallthru), except for noreturn throwing calls. > So inserting on the edges would usually mean undoing the hoisting. > Note if the expression doesn't contain MEM (and isn't clobbered by the call, > but that should just affect hard registers), hoisting it before the call is > just fine. But then sth is wrong with the dataflow problem ... maybe it somehow assumes that a signle outgoing edge is always fallthru (and not EH)? That is, inserting on EH edges is "tricky" at best...
