https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92264
--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I guess we can consider lowering the default value of the param and/or having separate param for var-tracking vs. for normal RTL optimizations. But before doing that I think we want to gather some statistics to help us decide on which value we want, like: --- gcc/alias.c 2020-03-09 13:38:04.534284063 +0100 +++ gcc/alias.c 2020-03-18 14:20:03.669278109 +0100 @@ -2116,6 +2116,14 @@ find_base_term (rtx x) rtx res = find_base_term (x, visited_vals); for (unsigned i = 0; i < visited_vals.length (); ++i) visited_vals[i].first->locs = visited_vals[i].second; + if (visited_vals.length () > 100) + { + FILE *f = fopen ("/tmp/fbt", "a"); + fprintf (f, "%d %s %s %d %d\n", (int) BITS_PER_WORD, + main_input_filename ? main_input_filename : "-", + current_function_name (), visited_vals.length (), res != NULL_RTX); + fclose (f); + } return res; } and use it on both x86_64-linux and i686-linux bootstrap/regtest (perhaps other targets too) and perhaps on some other packages too (firefox, libreoffice, ...).