http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55192
--- Comment #1 from Joel Sherrill <joel at gcc dot gnu.org> 2012-11-04 03:55:28 UTC --- Output of git bisect [joel@baltimore gcc]$ git bisect good Bisecting: 3 revisions left to test after this (roughly 2 steps) [5169661db3501031dfeb1971582809a702d6cebe] Integrate lexical block into source_location. [joel@baltimore gcc]$ git bisect bad Bisecting: 0 revisions left to test after this (roughly 1 step) [d452a16984ecc2f20644649f33c8ee38b246cbf0] * 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. [joel@baltimore gcc]$ ***** I think this might be too far since this appears to be powerpc specific. [joel@baltimore gcc]$ git bisect bad Bisecting: 0 revisions left to test after this (roughly 0 steps) [77ff7cbfe77156dc41943effa80948572fe383fa] 2012-09-19 Tulio Magno Quites Machado Filho <tul...@linux.vnet.ibm.com> [joel@baltimore gcc]$
