c6x-common.c (c6x_option_optimization_table): Enable -fmodulo-sched at -O2 and above.

c6x-common.c (c6x_option_optimization_table): Enable -fmodulo-sched at -O2 and above.

	* common/config/c6x/c6x-common.c (c6x_option_optimization_table):
	Enable -fmodulo-sched at -O2 and above.
	* config/c6x/c6x.md (doloop_end): New expander.
	(mvilc, sploop, spkernel, loop_end): New patterns.
	(loop_end with memory destination splitter): New.
	* config/c6x/c6x.c: Include "hw-doloop.h".
	(enum unitreqs): New.
	(unit_req_table): New typedef.
	(unit_reqs): New static variable.
	(unit_req_factor, get_unit_reqs, count_unit_reqs, merge_unit_reqs,
	res_mii, split_delayed_nonbranch, undo_split_delayed_nonbranch,
	hwloop_pattern_reg, bb_earliest_end_cycle, filter_insns_above,
	hwloop_optimize, hwloop_fail, c6x_hwloops): New static functions.
	(struct c6x_sched_context): New member last_scheduled_iter0.
	(init_sched_state): Initialize it.
	(c6x_variable_issue): Update it.
	(sploop_max_uid_iter0): New static variable.
	(c6x_sched_reorder_1): Be careful about issuing sploop.
	(c6x_reorg): Call c6x_hwlooops before the final schedule.

From-SVN: r179393