Hello,

In this case, we get an inconsistency between the sched-deps interface, 
saying we can't move an insn writing the si register through a vector insn, 
and the liveness analysis, saying we can.  The latter doesn't take into 
account implicit_reg_pending_clobbers set calculated in sched-deps before 
register allocation.  The solution is to reflect this set in our insn data 
(sets/uses/clobbers).

Ok for trunk?

gcc/

2016-01-15  Andrey Belevantsev  <abel@ispras.ru>

	PR target/64411
	* sched-deps.c (get_implicit_reg_pending_clobbers): New function,
	factored out from ...
	(sched_analyze_insn): ... here.
	* sched-int.h (get_implicit_reg_pending_clobbers): Declare it.
	* sel-sched-ir.c (setup_id_implicit_regs): New function, use
	get_implicit_reg_pending_clobbers in it.
	(setup_id_reg_sets): Use setup_id_implicit_regs.
	(deps_init_id): Ditto.

testsuite/

2016-01-15  Andrey Belevantsev  <abel@ispras.ru>

	PR target/64411
	* gcc.target/i386/pr64411.C: New test.

Best,
Andrey