re PR middle-end/64614 (bogus used initialized warning (in gcc 4.9.2); switch stateme...

re PR middle-end/64614 (bogus used initialized warning (in gcc 4.9.2); switch statement versus &)

2015-01-16  Richard Biener  <rguenther@suse.de>

	PR middle-end/64614
	* tree-ssa-uninit.c: Include tree-cfg.h.
	(MAX_SWITCH_CASES): New define.
	(convert_control_dep_chain_into_preds): Handle switch statements.
	(is_pred_expr_subset_of): Handle x == CST vs. (x & CST) != 0.
	(normalize_one_pred_1): Do not split bit-manipulations.
	Record (x & CST).

	* gcc.dg/uninit-18.c: New testcase.

From-SVN: r219739