gcc/

gcc/

	* tree-if-conv.c: Include hash-map.h.
	(aggressive_if_conv): New variable.
	(fold_build_cond_expr): Add simplification of non-zero condition.
	(add_to_dst_predicate_list): Invoke add_to_predicate_list if edge
	destination block is not always executed.
	(if_convertible_phi_p): Fix commentary, allow phi nodes have more
	than two predecessors if AGGRESSIVE_IF_CONV is true.
	(if_convertible_stmt_p): Fix commentary.
	(all_preds_critical_p): New function.
	(has_pred_critical_p): New function.
	(if_convertible_bb_p): Fix commentary, if AGGRESSIVE_IF_CONV is true
	BB can have more than two predecessors and all incoming edges can be
	critical.
	(predicate_bbs): Skip predication for loop exit block, use build2_loc
	to compute predicate for true edge.
	(find_phi_replacement_condition): Delete this function.
	(is_cond_scalar_reduction): Add arguments ARG_0, ARG_1 and EXTENDED.
	Allow interchange PHI arguments if EXTENDED is false.
	Change check that block containing reduction statement candidate
	is predecessor of phi-block since phi may have more than two arguments.
	(phi_args_hash_traits): New helper structure.
	(struct phi_args_hash_traits): New type.
	(phi_args_hash_traits::hash): New function.
	(phi_args_hash_traits::equal_keys): New function.
	(gen_phi_arg_condition): New function.
	(predicate_scalar_phi): Add handling of phi nodes with more than two
	arguments, delete COND and TRUE_BB arguments, insert body of
	find_phi_replacement_condition to predicate ordinary phi nodes.
	(predicate_all_scalar_phis): Skip blocks with the only predecessor,
	delete call of find_phi_replacement_condition and invoke
	predicate_scalar_phi with two arguments.
	(insert_gimplified_predicates): Add assert that non-predicated block
	don't have statements to insert.
	(ifcvt_split_critical_edges): New function.
	(ifcvt_split_def_stmt): Likewise.
	(ifcvt_walk_pattern_tree): Likewise.
	(stmt_is_root_of_bool_pattern): Likewise.
	(ifcvt_repair_bool_pattern): Likewise.
	(ifcvt_local_dce): Likewise.
	(tree_if_conversion): Add initialization of AGGRESSIVE_IF_CONV which
	is copy of inner or outer loop force_vectorize field, invoke
	ifcvt_split_critical_edges, ifcvt_local_dce and
	ifcvt_repair_bool_pattern for aggressive if-conversion.

gcc/testsuite/

	* gcc.dg/vect/vect-aggressive-1.c: New.
	* gcc.target/i386/avx2-vect-aggressive.c: New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@219658 138bc75d-0d04-0410-961f-82ee72b054a4