re PR tree-optimization/64746 (Loop with nested load/stores is not vectorized using...

re PR tree-optimization/64746 (Loop with nested load/stores is not vectorized using aggressive if-conversion.)

gcc/

	PR tree-optimization/64746
	* tree-if-conv.c (mask_exists): New function.
	(predicate_mem_writes): Save created mask with given size for further
	use.
	(stmt_is_root_of_bool_pattern): Remove argument VAR and store to it.
	(ifcvt_repair_bool_pattern): Collect all statements that are root
	of bool pattern and use iterative algorithm to remove multiple uses
	of predicates, display number of required iterations.

gcc/testsuite/

	PR tree-optimization/64746
	* gcc.target/i386/avx2-vect-aggressive-1.c: New test.

From-SVN: r220248