rs6000.c (rs6000_option_override_internal): Change rs6000_sched_costly_dep default...

rs6000.c (rs6000_option_override_internal): Change rs6000_sched_costly_dep default to true_store_to_load_dep_costly.

	* config/rs6000/rs6000.c (rs6000_option_override_internal): Change
	rs6000_sched_costly_dep default to true_store_to_load_dep_costly.
	(adjacent_mem_locations): Move some code to and call...
	(get_memref_parts): ...new function.
	(mem_locations_overlap): New function.
	(rs6000_adjust_priority): Adjust calls to is_load_insn/is_store_insn.
	(is_mem_ref): Rename to...
	(find_mem_ref): ...this. Return MEM rtx.
	(get_store_dest): Remove function.
	(is_load_insn1, is_load_insn, is_store_insn1, is_store_insn): Add
	new parameter and adjust calls.
	(rs6000_is_costly_dependence): Update calls for extra arg. Make sure
	mem refs overlap for true_store_to_load_dep_costly.
	(rs6000_sched_reorder2): Update calls for extra arg. Adjust args
	passed to adjacent_mem_locations.
	(is_costly_group): Walk resolved dependency list.
	(force_new_group): Emit group ending nop for Power6/Power7.
	* config/rs6000/rs6000.md (UNSPEC_GRP_END_NOP): New enum value.
	(group_ending_nop): New define_insn.

	* gcc.target/powerpc/lhs-1.c: New.
	* gcc.target/powerpc/lhs-2.c: New.
	* gcc.target/powerpc/lhs-3.c: New.

From-SVN: r187847