https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114480
--- Comment #16 from Richard Biener <rguenth at gcc dot gnu.org> --- Created attachment 57849 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57849&action=edit patch for expand Interestingly this patch for RTL expansion, more specifically add_scope_conflicts, only slows down things even though it should improve cache locality. In particular doing the 2nd stage inbetween makes things worse. Maybe this is due to the high in-degree of some blocks in the CFG. I'll note there's no "change" in the 2nd iteration for SCCs, so optimizing to only IOR in from (changed) backedges might "work" to reduce work. Still it's odd the apparent locality improvement doesn't actually help (as said it might be skewed by a high indegree of an SCC).
