https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106558
--- Comment #10 from Yury Gribov <ygribov at gcc dot gnu.org> --- Created attachment 53458 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53458&action=edit Very draft patch (In reply to Jakub Jelinek from comment #7) > Perhaps either a quick check that for base ptrs that live in memory > gimple_vuse is the same for both statements or if not, do walk_aliased_vdefs > with low constant limit? > We'd want to stop if we reach the vdef of the stmt in base_checks vector > (then we didn't find anything that could clobber it and can therefore use > the cached check) or when we see a stmt that may clobber it (then we can't > use the cached check). Something like this? It does not help with b.1_2 in attached reprocase though, because alias oracle considers *b.0_1 = 2; to clobber it. I'm trying to collect statistics how many checks this optimization removes during bootstrap-asan but I'm getting crashes when asan-bootstrapping on unchanged trunk. Is this possible?
