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* dbgcnt.def (sched_breakdep): New counter. * haifa-sched.c (update_insn_after_change): New static function, broken out of haifa_change_pattern. (haifa_change_pattern): Call it. (dep_t heap vecs): Declare. (INSN_COST): Define earlier. (next_cycle_replace_deps, next_cycle_apply): New static variables. (apply_replacement): New static function. (recompute_todo_spec): New argument FOR_BACKTRACK. All callers changed. Handle DEP_REPLACE deps. (contributes_to_priority_p): False for replaceable deps. (must_restore_pattern_p, restore_pattern): New static functions. (schedule_insn): Use them. Apply replacements for broken deps. (struct haifa_saved_data): Add new fields to keep track of replacements. (save_backtrack_point): Initialize them. (undo_replacements_for_backtrack): New static function. (restore_last_backtrack_point, free_topmost_backtrack_point): Use it and keep track of replacements. (perform_replacements_new_cycle, undo_all_replacements): New static functions. (schedule_block): Call these two as necessary. Call find_modifiable_mems. (try_ready): Tweak the assert. Check for DEP_POSTPONED. * sched-deps.c: Include "emit-rtl.h". (init_dep_1): Initialize DEP_NONREG, DEP_MULTIPLE and DEP_REPLACE. (dep_spec_p): True for DEP_REPLACE deps. (mark_as_hard): New static variable. (update_dep): Update DEP_NONREG and DEP_MULTIPLE. (add_dependence_list): New argument hard. All callers changed. Set and clear mark_as_hard around function body. (add_dependence_list_and_free): Likewise. (haifa_note_mem_dep): Set DEP_NONREG. (haifa_note_dep): Likewise if mark_as_hard is true. (sched_analyze_insn): Switch loop with if statement testing for sel_sched_p. (struct mem_inc_info): New. (attempt_change, parse_add_or_inc, find_inc, find_mem): New static functions. (find_modifiable_mems): New function. * sched-int.h (struct dep_replacement): New. (struct _dep): Add replace, nonreg and multiple fields. Make type and cost bitfields. (UNKNOWN_DEP_COST): Change to match the bitfield. (DEP_NONREG, DEP_MULTIPLE, DEP_REPLACE): New macros. (DEP_POSTPONED): New macro. (DEP_CANCELLED): Renumber. (find_modifiable_mems): Declare. (enum SCHED_FLAGS): Add DONT_BREAK_DEPENDENCIES. * sched-rgn.c (init_ready_list): Set TODO_SPEC here. (new_ready): Don't set HARD_DEP, use DEP_POSTPONED. (debug_dependencies): Dump DEP_NONREG and DEP_MULTIPLE. * Makefile.in (sched-deps.o): Update dependencies. * config/c6x/c6x.c (in_hwloop): New static variable. (c6x_set_sched_flags): If it is true, add DONT_BREAK_DEPENDENCIES. (hwloop_optimize): Set and clear it around preliminary scheduling pass. From-SVN: r191493
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