Model decoder of Core 2/i7 for multipass scheduling.

	Model decoder of Core 2/i7 for multipass scheduling.

	* config/i386/i386-protos.h (struct ix86_first_cycle_multipass_data_):
	New type to hold target-specific data for multipass scheduling.
	(TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DATA_T): Define.
	* config/i386/i386.c (ia32_multipass_dfa_lookahead): Update for
	Core 2/i7.
	(core2i7_secondary_decoder_max_insn_size,)
	(core2i7_secondary_ifetch_block_size, core2i7_ifetch_block_max_insns):
	New static variables.
	([const_]ix86_first_cycle_multipass_data_t): New typedefs.
	([_]ix86_first_cycle_multipass_data): New static variable.
	(core2i7_first_cycle_multipass_init, core2i7_dfa_poast_advance_cycle):
	Implement targetm.sched hooks.
	(core2i7_first_cycle_multipass_filter_ready_try): New static subroutine
	of ...
	(core2i7_first_cycle_multipass_{begin, issue, backtrack, end, fini}):
	Implement new targetm.sched hooks.
	(ix86_sched_init_global, TARGET_SCHED_INIT_GLOBAL): Define
	targetm.sched hook to install multipass scheduling hooks on demand.

	* doc/tm.texi.in: Document new targetm.sched hooks.
	* doc/tm.texi: Regenerate.

	* haifa-sched.c (TARGET_SCHED_FIRST_CYCLE_MULTIPASS_DATA_T): Define.
	(first_cycle_multipass_data_t): New typedef.
	(struct choice_entry: target_data): New field.
	(max_issue): Add first_cycle_insn_p parameter.  Call new target hooks
	to allow target model restrictions not represented in DFA.
	(choose_ready, schedule_block): Update.
	(sched_extend_ready_list, sched_finish_ready_list): Call new target
	hooks to initialize target-specific data for multipass scheduling.
	* sched-int.h (max_issue): Update declaration.
	* sel-sched.c (choose_best_insn): Update.
	* target.def (first_cycle_multipass_{begin, issue, backtrack},)
	(first_cycle_multipass_{init, fini}): Define and document new
	targetm.sched hooks.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@166196 138bc75d-0d04-0410-961f-82ee72b054a4