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[Bug middle-end/61409] [5/6/7 regression] -Wmaybe-uninitialized false-positive with -O2
- From: "aldyh at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sun, 20 Nov 2016 18:34:38 +0000
- Subject: [Bug middle-end/61409] [5/6/7 regression] -Wmaybe-uninitialized false-positive with -O2
- Auto-submitted: auto-generated
- References: <bug-61409-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61409
--- Comment #25 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Sun Nov 20 18:34:06 2016
New Revision: 242639
URL: https://gcc.gnu.org/viewcvs?rev=242639&root=gcc&view=rev
Log:
PR middle-end/61409
* tree-ssa-uninit.c: Define new global max_phi_args.
(compute_uninit_opnds_pos): Use max_phi_args.
(prune_uninit_phi_opnds): Same.
(use_pred_not_overlap_with_undef_path_pred): Remove reference to
missing NUM_PREDS in function comment.
(can_one_predicate_be_invalidated_p): New.
(can_chain_union_be_invalidated_p): New.
(flatten_out_predicate_chains): New.
(uninit_ops_invalidate_phi_use): New.
(is_use_properly_guarded): Call uninit_ops_invalidate_phi_use.
Added:
trunk/gcc/testsuite/gcc.dg/uninit-pr61409.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-ssa-uninit.c