[Bug target/55192] bfin generates invalid assembly

["joel at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

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  <tuliom@linux.vnet.ibm.com>
[joel@baltimore gcc]$