https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108697
--- Comment #4 from Aldy Hernandez <aldyh at gcc dot gnu.org> --- Created attachment 54420 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54420&action=edit reuse path_range_query SSA cache for all of back_threader class Off of the top of my head (i.e. probably very broken ;-)), this is what I had in mind... Share a cache between subsequent instantiations of path_range_query. Note the change to the set_cache: path_range_query::set_cache (const vrange &r, tree name) { unsigned v = SSA_NAME_VERSION (name); - bitmap_set_bit (m_has_cache_entry, v); + if (bitmap_set_bit (m_has_cache_entry, v)) + m_cache->clear_global_range (name); m_cache->set_global_range (name, r); } Since we're sharing the cache, make sure we nuke whatever it had there before, otherwise set_global_range will try to reuse the slot if it thinks it fits. Although...maybe that's not even necessary. I'm not sure...you'd have to play around with it, but I think the general idea would work.
