[Committed] Merge IA-64 specific changes of selective scheduler

[Andrey Belevantsev <abel at ispras dot ru>]

Hello,

As Steve Ellcey has approved the remaining IA-64 specific changes of the 
selective scheduler patch, I have now committed them to trunk.  There is 
also a small change of the interface of two scheduler hooks used only on 
IA-64; this was approved by Vlad in the generic part, but not committed 
previously because IA-64 changes were not committed.

I would like to thank Vlad, Steve, and Ian one more time for their 
efforts in reviewing the code.

Andrey

2008-10-14  Andrey Belevantsev  <abel@ispras.ru>
	    Dmitry Melnik  <dm@ispras.ru>
	    Dmitry Zhurikhin  <zhur@ispras.ru>
	    Alexander Monakov  <amonakov@ispras.ru>
	    Maxim Kuvyrkov  <maxim@codesourcery.com>

	* target.h (struct gcc_target): Update prototypes of needs_block_p
	and gen_spec_check.
	* haifa-sched.c (create_check_block_twin): Update calls to the above.
	* sel-sched.c (create_speculation_check): Likewise.
	* doc/tm.texi: Provide documentation for new target hooks.
		
	* config/ia64/ia64.c: Include sel-sched.h.  Rewrite speculation hooks.
	(ia64_gen_spec_insn): Removed.
	(get_spec_check_gen_function, insn_can_be_in_speculative_p,
	ia64_gen_spec_check): New static functions.
	(ia64_alloc_sched_context, ia64_init_sched_context,
	ia64_set_sched_context, ia64_clear_sched_context,
	ia64_free_sched_context, ia64_get_insn_spec_ds,
	ia64_get_insn_checked_ds, ia64_skip_rtx_p): Declare functions.
	(ia64_needs_block_p): Change prototype.
	(ia64_gen_check): Rename to ia64_gen_spec_check.
	(ia64_adjust_cost): Rename to ia64_adjust_cost_2.  Add new parameter
	into declaration, add special memory dependencies handling.
	(TARGET_SCHED_ALLOC_SCHED_CONTEXT, TARGET_SCHED_INIT_SCHED_CONTEXT,
	TARGET_SCHED_SET_SCHED_CONTEXT, TARGET_SCHED_CLEAR_SCHED_CONTEXT,
	TARGET_SCHED_FREE_SCHED_CONTEXT, TARGET_SCHED_GET_INSN_SPEC_DS,
	TARGET_SCHED_GET_INSN_CHECKED_DS, TARGET_SCHED_SKIP_RTX_P):
	Define new target hooks.
	(TARGET_SCHED_GEN_CHECK): Rename to TARGET_SCHED_GEN_SPEC_CHECK.
	(ia64_optimization_options): Turn on selective scheduling with -O3,
	disable -fauto-inc-dec. Set mflag_sched_control_spec to true by default
	with selective scheduling.
	(ia64_override_options): Initialize align_loops and align_functions
	to 32 and 64, respectively.  Set global selective scheduling flags
	according to target-dependent flags.
	(rtx_needs_barrier): Support UNSPEC_LDS_A.
	(group_barrier_needed): Use new mstop-bit-before-check flag.
	Add heuristic.
	(dfa_state_size): Make global.
	(spec_check_no, max_uid): Remove.
        (mem_ops_in_group, current_cycle): New variables.
	(ia64_sched_init): Disable checks for !SCHED_GROUP_P after reload.
        Initialize new variables.
        (is_load_p, record_memory_reference): New functions.
        (ia64_dfa_sched_reorder): Lower priority of loads when limit is
        reached.
	(ia64_variable_issue): Change use of current_sched_info to
	sched_deps_info.  Update comment.  Note if a load or a store is issued.
        (ia64_first_cycle_multipass_dfa_lookahead_guard_spec): Require 
a cycle
        advance if maximal number of loads or stores was issued on current
        cycle.
	(scheduled_good_insn): New static helper function.
        (ia64_dfa_new_cycle): Assert that last_scheduled_insn is set when
        a group barrier is needed.  Fix vertical spacing.  Guard the code
        doing state transition with last_scheduled_insn check. 

        Mark that a stop bit should be before current insn if there was a
        cycle advance.  Update current_cycle and mem_ops_in_group.
	(ia64_h_i_d_extended): Change use of current_sched_info to
        sched_deps_info. Reallocate stops_p by larger chunks.
	(struct _ia64_sched_context): New structure.
	(ia64_sched_context_t): New typedef.
	(ia64_alloc_sched_context, ia64_init_sched_context,
	ia64_set_sched_context, ia64_clear_sched_context,
	ia64_free_sched_context): New static functions.
	(gen_func_t): New typedef.
	(get_spec_load_gen_function): New function.
	(SPEC_GEN_EXTEND_OFFSET): Declare.	
	(ia64_set_sched_flags): Check common_sched_info instead of *flags.
	(get_mode_no_for_insn): Change the condition that prevents use of
	special hardware registers so it can now handle pseudos.
	(get_spec_unspec_code): New function.
	(ia64_skip_rtx_p, get_insn_spec_code, ia64_get_insn_spec_ds,
	ia64_get_insn_checked_ds, ia64_gen_spec_load): New static functions.
	(ia64_speculate_insn, ia64_needs_block_p): Support branchy checks
	during selective scheduling.
	(ia64_speculate_insn): Use ds_get_speculation_types when
	determining whether we need to change the pattern.
	(SPEC_GEN_LD_MAP, SPEC_GEN_CHECK_OFFSET): Declare.
	(ia64_spec_check_src_p): Support new speculation/check codes.
	(struct bundle_state): New field.
	(issue_nops_and_insn): Initialize it.
	(insert_bundle_state): Minimize mid-bundle stop bits.
	(important_for_bundling_p): New function.
	(get_next_important_insn): Use important_for_bundling_p.
	(bundling): When shifting TImode from unimportant insns, ignore
	also group barriers.  Assert that best state is found before
	the backward bundling pass.  Print number of mid-bundle stop bits.
	Minimize mid-bundle stop bits.  Check correct calculation of
	mid-bundle stop bits.
	(ia64_sched_finish, final_emit_insn_group_barriers): Fix formatting.
	(final_emit_insn_group_barriers): Emit stop bits before insns starting
	a new cycle.
	(sel2_run): New variable.
	(ia64_reorg): When flag_selective_scheduling2 is set, run the selective
	scheduling pass instead of schedule_ebbs.
	
	* config/ia64/ia64.md (speculable1, speculable2): New attributes.
	(UNSPEC_LDS_A): New UNSPEC.
	(movqi_internal, movhi_internal, movsi_internal, movdi_internal,
	movti_internal, movsf_internal, movdf_internal,
	movxf_internal): Make visible.  Add speculable* attributes.
	(output_c_nc): New mode attribute.
	(mov<mode>_speculative_a, zero_extend<mode>di2_speculative_a,
	mov<mode>_nc, zero_extend<mode>di2_nc,
	advanced_load_check_nc_<mode>): New insns.
	(zero_extend*): Add speculable* attributes.

	* config/ia64/ia64.opt (msched_fp_mem_deps_zero_cost): New option.
	(msched-stop-bits-after-every-cycle): Likewise.
	(msched-max-memory-insns,
        msched-max-memory-insns-hard-limit): Likewise.
	(msched-spec-verbose): Remove.
	(msched-prefer-non-data-spec-insns,
        msched-prefer-non-control-spec-insns, 
msched-count-spec-in-critical-path,
	msel-sched-dont-check-control-spec): Use Target
        Report Var instead of Common Report Var.

	* config/ia64/itanium2.md: Remove incorrect bypass.
	
	* config/ia64/t-ia64 (ia64.o): Add dependency on sel-sched.h.

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