[Bug rtl-optimization/94045] [i686] Compiler hang with -O2 -g -m32 -march=i686 -mtune=generic

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94045

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/alias.c.jj      2020-03-03 19:39:53.228598307 +0100
+++ gcc/alias.c 2020-03-05 13:32:10.115235397 +0100
@@ -2005,6 +2005,10 @@ find_base_term (rtx x, vec<std::pair<cse
       if (cselib_sp_based_value_p (val))
        return static_reg_base_value[STACK_POINTER_REGNUM];

+      if (visited_vals.length () > 2048
+         && cselib_preserved_value_p (val))
+       return ret;
+
       f = val->locs;
       /* Reset val->locs to avoid infinite recursion.  */
       if (f)
works the same on the testcase, and doesn't affect non-var-tracking.