Hi, while looking into the PR I also improved debug output in ipa-modref and fixed ignore_nondeterminism predicate: looping pures and cont are still deterministic.
Bootstrapped/regtested x86_64-linux, comitted. gcc/ChangeLog: 2021-11-21 Jan Hubicka <hubi...@ucw.cz> PR ipa/103052 * ipa-modref.c (ignore_nondeterminism_p): Allow looping pure/cont. (merge_call_side_effects): Improve debug output. diff --git a/gcc/ipa-modref.c b/gcc/ipa-modref.c index 57e2aa5d868..20810c74da5 100644 --- a/gcc/ipa-modref.c +++ b/gcc/ipa-modref.c @@ -923,8 +923,7 @@ record_access_p (tree expr) static bool ignore_nondeterminism_p (tree caller, int flags) { - if ((flags & (ECF_CONST | ECF_PURE)) - && !(flags & ECF_LOOPING_CONST_OR_PURE)) + if (flags & (ECF_CONST | ECF_PURE)) return true; if ((flags & (ECF_NORETURN | ECF_NOTHROW)) == (ECF_NORETURN | ECF_NOTHROW) || (!opt_for_fn (caller, flag_exceptions) && (flags & ECF_NORETURN))) @@ -1016,6 +1015,10 @@ merge_call_side_effects (modref_summary *cur_summary, && !(flags & ECF_LOOPING_CONST_OR_PURE)) return changed; + if (dump_file) + fprintf (dump_file, " - Merging side effects of %s\n", + callee_node->dump_name ()); + if (!(flags & (ECF_CONST | ECF_NOVOPS | ECF_PURE)) || (flags & ECF_LOOPING_CONST_OR_PURE)) { @@ -1061,8 +1064,7 @@ merge_call_side_effects (modref_summary *cur_summary, } if (dump_file) - fprintf (dump_file, " - Merging side effects of %s with parm map:", - callee_node->dump_name ()); + fprintf (dump_file, " Parm map:"); parm_map.safe_grow_cleared (gimple_call_num_args (stmt), true); for (unsigned i = 0; i < gimple_call_num_args (stmt); i++)