port revision 219584 from linaro/gcc-4_9-branch

gcc/
2015-01-14  Yvan Roux  <yvan.roux@linaro.org>

	Backport from trunk r218451.
	2014-12-06  James Greenhalgh  <james.greenhalgh@arm.com>
                    Sebastian Pop  <s.pop@samsung.com>
                    Brian Rzycki  <b.rzycki@samsung.com>

	PR tree-optimization/54742
	* params.def (max-fsm-thread-path-insns, max-fsm-thread-length,
	max-fsm-thread-paths): New.

	* doc/invoke.texi (max-fsm-thread-path-insns, max-fsm-thread-length,
	max-fsm-thread-paths): Documented.

	* tree-cfg.c (split_edge_bb_loc): Export.
	* tree-cfg.h (split_edge_bb_loc): Declared extern.

	* tree-ssa-threadedge.c (simplify_control_stmt_condition): Restore the
	original value of cond when simplification fails.
	(fsm_find_thread_path): New.
	(fsm_find_control_statement_thread_paths): New.
	(thread_through_normal_block): Call find_control_statement_thread_paths.

	* tree-ssa-threadupdate.c (dump_jump_thread_path): Pretty print
	EDGE_FSM_THREAD.
	(verify_seme): New.
	(duplicate_seme_region): New.
	(thread_through_all_blocks): Generate code for EDGE_FSM_THREAD edges
	calling duplicate_seme_region.

	* tree-ssa-threadupdate.h (jump_thread_edge_type): Add EDGE_FSM_THREAD.

gcc/testsuite/
2015-01-14  Yvan Roux  <yvan.roux@linaro.org>

	Backport from trunk r218451.
            2014-12-06  James Greenhalgh  <james.greenhalgh@arm.com>
                        Sebastian Pop  <s.pop@samsung.com>
                        Brian Rzycki  <b.rzycki@samsung.com>

	PR tree-optimization/54742
	* gcc.dg/tree-ssa/ssa-dom-thread-6.c: New test.
	* gcc.dg/tree-ssa/ssa-dom-thread-7.c: New test.

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