2013-06-12  Marc Glisse  <marc.glisse@inria.fr>

	PR tree-optimization/57361
gcc/
	* tree-ssa-dse.c (dse_possible_dead_store_p): Handle self-assignment.

gcc/testsuite/
	* gcc.dg/tree-ssa/pr57361.c: New file.

From-SVN: r200034