Hi! The new DCE code inside of tree DSE removes in -fnon-call-exceptions go code a load from NULL pointer the testcase relies on throwing an exception and so the test hangs.
The following patch just repeats a check that e.g. tree-ssa-dce.c uses to prevent this. Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? 2021-05-03 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/100382 * tree-ssa-dse.c: Include tree-eh.h. (dse_dom_walker::before_dom_children): Don't remove stmts if stmt_unremovable_because_of_non_call_eh_p is true. --- gcc/tree-ssa-dse.c.jj 2021-05-02 16:25:43.636266833 +0200 +++ gcc/tree-ssa-dse.c 2021-05-02 19:42:53.451320031 +0200 @@ -39,6 +39,7 @@ along with GCC; see the file COPYING3. #include "builtins.h" #include "gimple-fold.h" #include "gimplify.h" +#include "tree-eh.h" /* This file implements dead store elimination. @@ -1193,7 +1194,8 @@ dse_dom_walker::before_dom_children (bas /* When we remove dead stores make sure to also delete trivially dead SSA defs. */ if (has_zero_uses (DEF_FROM_PTR (def_p)) - && !gimple_has_side_effects (stmt)) + && !gimple_has_side_effects (stmt) + && !stmt_unremovable_because_of_non_call_eh_p (cfun, stmt)) { if (dump_file && (dump_flags & TDF_DETAILS)) { Jakub