r242639 - in /trunk/gcc: ChangeLog testsuite/gc...

[aldyh@gcc.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