/* Control flow optimization code for GNU compiler.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* This file contains optimizer of the control flow. The main entry point is
cleanup_cfg. Following optimizations are performed:
#include "target.h"
#include "cfglayout.h"
#include "emit-rtl.h"
+#include "tree-pass.h"
+#include "cfgloop.h"
+#include "expr.h"
-/* cleanup_cfg maintains following flags for each basic block. */
-
-enum bb_flags
-{
- /* Set if BB is the forwarder block to avoid too many
- forwarder_block_p calls. */
- BB_FORWARDER_BLOCK = 1,
- BB_NONTHREADABLE_BLOCK = 2
-};
-
-#define BB_FLAGS(BB) (enum bb_flags) (BB)->aux
-#define BB_SET_FLAG(BB, FLAG) \
- (BB)->aux = (void *) (long) ((enum bb_flags) (BB)->aux | (FLAG))
-#define BB_CLEAR_FLAG(BB, FLAG) \
- (BB)->aux = (void *) (long) ((enum bb_flags) (BB)->aux & ~(FLAG))
-
-#define FORWARDER_BLOCK_P(BB) (BB_FLAGS (BB) & BB_FORWARDER_BLOCK)
-
+#define FORWARDER_BLOCK_P(BB) ((BB)->flags & BB_FORWARDER_BLOCK)
+
/* Set to true when we are running first pass of try_optimize_cfg loop. */
static bool first_pass;
static bool try_crossjump_to_edge (int, edge, edge);
return;
if (forwarder_block_p (bb))
- BB_SET_FLAG (bb, BB_FORWARDER_BLOCK);
+ bb->flags |= BB_FORWARDER_BLOCK;
}
/* Recompute forwarder flag after block has been modified. */
update_forwarder_flag (basic_block bb)
{
if (forwarder_block_p (bb))
- BB_SET_FLAG (bb, BB_FORWARDER_BLOCK);
+ bb->flags |= BB_FORWARDER_BLOCK;
else
- BB_CLEAR_FLAG (bb, BB_FORWARDER_BLOCK);
+ bb->flags &= ~BB_FORWARDER_BLOCK;
}
\f
/* Simplify a conditional jump around an unconditional jump.
be the last block in the function, and must contain just the
unconditional jump. */
jump_block = cbranch_fallthru_edge->dest;
- if (EDGE_COUNT (jump_block->preds) >= 2
+ if (!single_pred_p (jump_block)
|| jump_block->next_bb == EXIT_BLOCK_PTR
|| !FORWARDER_BLOCK_P (jump_block))
return false;
- jump_dest_block = EDGE_SUCC (jump_block, 0)->dest;
+ jump_dest_block = single_succ (jump_block);
/* If we are partitioning hot/cold basic blocks, we don't want to
mess up unconditional or indirect jumps that cross between hot
partition boundaries). See the comments at the top of
bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */
- if (flag_reorder_blocks_and_partition
- && (BB_PARTITION (jump_block) != BB_PARTITION (jump_dest_block)
- || (cbranch_jump_edge->flags & EDGE_CROSSING)))
+ if (BB_PARTITION (jump_block) != BB_PARTITION (jump_dest_block)
+ || (cbranch_jump_edge->flags & EDGE_CROSSING))
return false;
/* The conditional branch must target the block after the
bool failed = false;
reg_set_iterator rsi;
- if (BB_FLAGS (b) & BB_NONTHREADABLE_BLOCK)
+ if (b->flags & BB_NONTHREADABLE_BLOCK)
return NULL;
/* At the moment, we do handle only conditional jumps, but later we may
return NULL;
if (EDGE_COUNT (b->succs) != 2)
{
- BB_SET_FLAG (b, BB_NONTHREADABLE_BLOCK);
+ b->flags |= BB_NONTHREADABLE_BLOCK;
return NULL;
}
if (!any_condjump_p (BB_END (b)) || !onlyjump_p (BB_END (b)))
{
- BB_SET_FLAG (b, BB_NONTHREADABLE_BLOCK);
+ b->flags |= BB_NONTHREADABLE_BLOCK;
return NULL;
}
insn = NEXT_INSN (insn))
if (INSN_P (insn) && side_effects_p (PATTERN (insn)))
{
- BB_SET_FLAG (b, BB_NONTHREADABLE_BLOCK);
+ b->flags |= BB_NONTHREADABLE_BLOCK;
return NULL;
}
if (INSN_P (insn))
cselib_process_insn (insn);
- nonequal = BITMAP_XMALLOC();
+ nonequal = BITMAP_ALLOC (NULL);
CLEAR_REG_SET (nonequal);
/* Now assume that we've continued by the edge E to B and continue
have life information in cfg_cleanup. */
if (failed)
{
- BB_SET_FLAG (b, BB_NONTHREADABLE_BLOCK);
+ b->flags |= BB_NONTHREADABLE_BLOCK;
goto failed_exit;
}
/* In case liveness information is available, we need to prove equivalence
only of the live values. */
if (mode & CLEANUP_UPDATE_LIFE)
- AND_REG_SET (nonequal, b->global_live_at_end);
+ AND_REG_SET (nonequal, b->il.rtl->global_live_at_end);
EXECUTE_IF_SET_IN_REG_SET (nonequal, 0, i, rsi)
goto failed_exit;
- BITMAP_XFREE (nonequal);
+ BITMAP_FREE (nonequal);
cselib_finish ();
if ((comparison_dominates_p (code1, code2) != 0)
!= (XEXP (SET_SRC (set2), 1) == pc_rtx))
return FALLTHRU_EDGE (b);
failed_exit:
- BITMAP_XFREE (nonequal);
+ BITMAP_FREE (nonequal);
cselib_finish ();
return NULL;
}
partition boundaries). See the comments at the top of
bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */
- if (flag_reorder_blocks_and_partition
- && find_reg_note (BB_END (b), REG_CROSSING_JUMP, NULL_RTX))
+ if (find_reg_note (BB_END (b), REG_CROSSING_JUMP, NULL_RTX))
return false;
for (ei = ei_start (b->succs); (e = ei_safe_edge (ei)); )
bb-reorder.c:partition_hot_cold_basic_blocks for complete
details. */
- if (flag_reorder_blocks_and_partition
- && first != EXIT_BLOCK_PTR
+ if (first != EXIT_BLOCK_PTR
&& find_reg_note (BB_END (first), REG_CROSSING_JUMP, NULL_RTX))
return false;
may_thread |= target->flags & BB_DIRTY;
if (FORWARDER_BLOCK_P (target)
- && !(EDGE_SUCC (target, 0)->flags & EDGE_CROSSING)
- && EDGE_SUCC (target, 0)->dest != EXIT_BLOCK_PTR)
+ && !(single_succ_edge (target)->flags & EDGE_CROSSING)
+ && single_succ (target) != EXIT_BLOCK_PTR)
{
/* Bypass trivial infinite loops. */
- if (target == EDGE_SUCC (target, 0)->dest)
+ new_target = single_succ (target);
+ if (target == new_target)
counter = n_basic_blocks;
- new_target = EDGE_SUCC (target, 0)->dest;
}
/* Allow to thread only over one edge at time to simplify updating
For fallthru forwarders, the LOOP_BEG note must appear between
the header of block and CODE_LABEL of the loop, for non forwarders
it must appear before the JUMP_INSN. */
- if ((mode & CLEANUP_PRE_LOOP) && optimize)
+ if ((mode & CLEANUP_PRE_LOOP) && optimize && flag_loop_optimize)
{
rtx insn = (EDGE_SUCC (target, 0)->flags & EDGE_FALLTHRU
? BB_HEAD (target) : prev_nonnote_insn (BB_END (target)));
&& NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_BEG)
break;
- if (NOTE_P (insn))
+ if (insn && NOTE_P (insn))
break;
/* Do not clean up branches to just past the end of a loop
/ REG_BR_PROB_BASE);
if (!FORWARDER_BLOCK_P (b) && forwarder_block_p (b))
- BB_SET_FLAG (b, BB_FORWARDER_BLOCK);
+ b->flags |= BB_FORWARDER_BLOCK;
do
{
edge t;
- if (EDGE_COUNT (first->succs) > 1)
+ if (!single_succ_p (first))
{
gcc_assert (n < nthreaded_edges);
t = threaded_edges [n++];
if (n < nthreaded_edges
&& first == threaded_edges [n]->src)
n++;
- t = EDGE_SUCC (first, 0);
+ t = single_succ_edge (first);
}
t->count -= edge_count;
partition boundaries). See the comments at the top of
bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */
- if (flag_reorder_blocks_and_partition
- && (BB_PARTITION (a) != BB_PARTITION (b)
- || find_reg_note (BB_END (a), REG_CROSSING_JUMP, NULL_RTX)))
+ if (BB_PARTITION (a) != BB_PARTITION (b))
return;
barrier = next_nonnote_insn (BB_END (a));
partition boundaries). See the comments at the top of
bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */
- if (flag_reorder_blocks_and_partition
- && (find_reg_note (BB_END (a), REG_CROSSING_JUMP, NULL_RTX)
- || BB_PARTITION (a) != BB_PARTITION (b)))
+ if (BB_PARTITION (a) != BB_PARTITION (b))
return;
real_b_end = BB_END (b);
partition boundaries). See the comments at the top of
bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */
- if (flag_reorder_blocks_and_partition
- && (find_reg_note (BB_END (b), REG_CROSSING_JUMP, NULL_RTX)
- || find_reg_note (BB_END (c), REG_CROSSING_JUMP, NULL_RTX)
- || BB_PARTITION (b) != BB_PARTITION (c)))
+ if (BB_PARTITION (b) != BB_PARTITION (c))
return NULL;
/* If BB1 has only one successor, we may be looking at either an
unconditional jump, or a fake edge to exit. */
- if (EDGE_COUNT (bb1->succs) == 1
- && (EDGE_SUCC (bb1, 0)->flags & (EDGE_COMPLEX | EDGE_FAKE)) == 0
+ if (single_succ_p (bb1)
+ && (single_succ_edge (bb1)->flags & (EDGE_COMPLEX | EDGE_FAKE)) == 0
&& (!JUMP_P (BB_END (bb1)) || simplejump_p (BB_END (bb1))))
- return (EDGE_COUNT (bb2->succs) == 1
- && (EDGE_SUCC (bb2, 0)->flags & (EDGE_COMPLEX | EDGE_FAKE)) == 0
+ return (single_succ_p (bb2)
+ && (single_succ_edge (bb2)->flags
+ & (EDGE_COMPLEX | EDGE_FAKE)) == 0
&& (!JUMP_P (BB_END (bb2)) || simplejump_p (BB_END (bb2))));
/* Match conditional jumps - this may get tricky when fallthru and branch
/* Get around possible forwarders on fallthru edges. Other cases
should be optimized out already. */
if (FORWARDER_BLOCK_P (f1->dest))
- f1 = EDGE_SUCC (f1->dest, 0);
+ f1 = single_succ_edge (f1->dest);
if (FORWARDER_BLOCK_P (f2->dest))
- f2 = EDGE_SUCC (f2->dest, 0);
+ f2 = single_succ_edge (f2->dest);
/* To simplify use of this function, return false if there are
unneeded forwarder blocks. These will get eliminated later
if (fallthru1)
{
basic_block d1 = (forwarder_block_p (fallthru1->dest)
- ? EDGE_SUCC (fallthru1->dest, 0)->dest: fallthru1->dest);
+ ? single_succ (fallthru1->dest): fallthru1->dest);
basic_block d2 = (forwarder_block_p (fallthru2->dest)
- ? EDGE_SUCC (fallthru2->dest, 0)->dest: fallthru2->dest);
+ ? single_succ (fallthru2->dest): fallthru2->dest);
if (d1 != d2)
return false;
about multiple entry or chained forwarders, as they will be optimized
away. We do this to look past the unconditional jump following a
conditional jump that is required due to the current CFG shape. */
- if (EDGE_COUNT (src1->preds) == 1
+ if (single_pred_p (src1)
&& FORWARDER_BLOCK_P (src1))
- e1 = EDGE_PRED (src1, 0), src1 = e1->src;
+ e1 = single_pred_edge (src1), src1 = e1->src;
- if (EDGE_COUNT (src2->preds) == 1
+ if (single_pred_p (src2)
&& FORWARDER_BLOCK_P (src2))
- e2 = EDGE_PRED (src2, 0), src2 = e2->src;
+ e2 = single_pred_edge (src2), src2 = e2->src;
/* Nothing to do if we reach ENTRY, or a common source block. */
if (src1 == ENTRY_BLOCK_PTR || src2 == ENTRY_BLOCK_PTR)
/* Seeing more than 1 forwarder blocks would confuse us later... */
if (FORWARDER_BLOCK_P (e1->dest)
- && FORWARDER_BLOCK_P (EDGE_SUCC (e1->dest, 0)->dest))
+ && FORWARDER_BLOCK_P (single_succ (e1->dest)))
return false;
if (FORWARDER_BLOCK_P (e2->dest)
- && FORWARDER_BLOCK_P (EDGE_SUCC (e2->dest, 0)->dest))
+ && FORWARDER_BLOCK_P (single_succ (e2->dest)))
return false;
/* Likewise with dead code (possibly newly created by the other optimizations
basic_block d = s->dest;
if (FORWARDER_BLOCK_P (d))
- d = EDGE_SUCC (d, 0)->dest;
+ d = single_succ (d);
FOR_EACH_EDGE (s2, ei, src1->succs)
{
basic_block d2 = s2->dest;
if (FORWARDER_BLOCK_P (d2))
- d2 = EDGE_SUCC (d2, 0)->dest;
+ d2 = single_succ (d2);
if (d == d2)
break;
}
into infinite loop. */
if (FORWARDER_BLOCK_P (s->dest))
{
- EDGE_SUCC (s->dest, 0)->count += s2->count;
+ single_succ_edge (s->dest)->count += s2->count;
s->dest->count += s2->count;
s->dest->frequency += EDGE_FREQUENCY (s);
}
if (FORWARDER_BLOCK_P (s2->dest))
{
- EDGE_SUCC (s2->dest, 0)->count -= s2->count;
- if (EDGE_SUCC (s2->dest, 0)->count < 0)
- EDGE_SUCC (s2->dest, 0)->count = 0;
+ single_succ_edge (s2->dest)->count -= s2->count;
+ if (single_succ_edge (s2->dest)->count < 0)
+ single_succ_edge (s2->dest)->count = 0;
s2->dest->count -= s2->count;
s2->dest->frequency -= EDGE_FREQUENCY (s);
if (s2->dest->frequency < 0)
newpos1 = NEXT_INSN (newpos1);
redirect_from = split_block (src1, PREV_INSN (newpos1))->src;
- to_remove = EDGE_SUCC (redirect_from, 0)->dest;
+ to_remove = single_succ (redirect_from);
- redirect_edge_and_branch_force (EDGE_SUCC (redirect_from, 0), redirect_to);
+ redirect_edge_and_branch_force (single_succ_edge (redirect_from), redirect_to);
delete_basic_block (to_remove);
update_forwarder_flag (redirect_from);
+ if (redirect_to != src2)
+ update_forwarder_flag (src2);
return true;
}
if (EDGE_COUNT (bb->preds) < 2)
return false;
+ /* Don't crossjump if this block ends in a computed jump,
+ unless we are optimizing for size. */
+ if (!optimize_size
+ && bb != EXIT_BLOCK_PTR
+ && computed_jump_p (BB_END (bb)))
+ return false;
+
/* If we are partitioning hot/cold basic blocks, we don't want to
mess up unconditional or indirect jumps that cross between hot
and cold sections.
partition boundaries). See the comments at the top of
bb-reorder.c:partition_hot_cold_basic_blocks for complete details. */
- if (flag_reorder_blocks_and_partition
- && (BB_PARTITION (EDGE_PRED (bb, 0)->src) != BB_PARTITION (EDGE_PRED (bb, 1)->src)
- || (EDGE_PRED (bb, 0)->flags & EDGE_CROSSING)))
+ if (BB_PARTITION (EDGE_PRED (bb, 0)->src) !=
+ BB_PARTITION (EDGE_PRED (bb, 1)->src)
+ || (EDGE_PRED (bb, 0)->flags & EDGE_CROSSING))
return false;
/* It is always cheapest to redirect a block that ends in a branch to
if (mode & CLEANUP_CROSSJUMP)
add_noreturn_fake_exit_edges ();
- FOR_EACH_BB (bb)
- update_forwarder_flag (bb);
-
if (mode & (CLEANUP_UPDATE_LIFE | CLEANUP_CROSSJUMP | CLEANUP_THREADING))
clear_bb_flags ();
+ FOR_EACH_BB (bb)
+ update_forwarder_flag (bb);
+
if (! targetm.cannot_modify_jumps_p ())
{
first_pass = true;
}
/* Remove code labels no longer used. */
- if (EDGE_COUNT (b->preds) == 1
- && (EDGE_PRED (b, 0)->flags & EDGE_FALLTHRU)
- && !(EDGE_PRED (b, 0)->flags & EDGE_COMPLEX)
+ if (single_pred_p (b)
+ && (single_pred_edge (b)->flags & EDGE_FALLTHRU)
+ && !(single_pred_edge (b)->flags & EDGE_COMPLEX)
&& LABEL_P (BB_HEAD (b))
/* If the previous block ends with a branch to this
block, we can't delete the label. Normally this
if CASE_DROPS_THRU, this can be a tablejump with
some element going to the same place as the
default (fallthru). */
- && (EDGE_PRED (b, 0)->src == ENTRY_BLOCK_PTR
- || !JUMP_P (BB_END (EDGE_PRED (b, 0)->src))
+ && (single_pred (b) == ENTRY_BLOCK_PTR
+ || !JUMP_P (BB_END (single_pred (b)))
|| ! label_is_jump_target_p (BB_HEAD (b),
- BB_END (EDGE_PRED (b, 0)->src))))
+ BB_END (single_pred (b)))))
{
rtx label = BB_HEAD (b);
/* If we fall through an empty block, we can remove it. */
if (!(mode & CLEANUP_CFGLAYOUT)
- && EDGE_COUNT (b->preds) == 1
- && (EDGE_PRED (b, 0)->flags & EDGE_FALLTHRU)
+ && single_pred_p (b)
+ && (single_pred_edge (b)->flags & EDGE_FALLTHRU)
&& !LABEL_P (BB_HEAD (b))
&& FORWARDER_BLOCK_P (b)
/* Note that forwarder_block_p true ensures that
there is a successor for this block. */
- && (EDGE_SUCC (b, 0)->flags & EDGE_FALLTHRU)
+ && (single_succ_edge (b)->flags & EDGE_FALLTHRU)
&& n_basic_blocks > 1)
{
if (dump_file)
b->index);
c = b->prev_bb == ENTRY_BLOCK_PTR ? b->next_bb : b->prev_bb;
- redirect_edge_succ_nodup (EDGE_PRED (b, 0), EDGE_SUCC (b, 0)->dest);
+ redirect_edge_succ_nodup (single_pred_edge (b),
+ single_succ (b));
delete_basic_block (b);
changed = true;
b = c;
}
- if (EDGE_COUNT (b->succs) == 1
- && (s = EDGE_SUCC (b, 0))
+ if (single_succ_p (b)
+ && (s = single_succ_edge (b))
&& !(s->flags & EDGE_COMPLEX)
&& (c = s->dest) != EXIT_BLOCK_PTR
- && EDGE_COUNT (c->preds) == 1
+ && single_pred_p (c)
&& b != c)
{
/* When not in cfg_layout mode use code aware of reordering
non-trivial jump instruction without side-effects, we
can either delete the jump entirely, or replace it
with a simple unconditional jump. */
- if (EDGE_COUNT (b->succs) == 1
- && EDGE_SUCC (b, 0)->dest != EXIT_BLOCK_PTR
+ if (single_succ_p (b)
+ && single_succ (b) != EXIT_BLOCK_PTR
&& onlyjump_p (BB_END (b))
&& !find_reg_note (BB_END (b), REG_CROSSING_JUMP, NULL_RTX)
- && try_redirect_by_replacing_jump (EDGE_SUCC (b, 0), EDGE_SUCC (b, 0)->dest,
+ && try_redirect_by_replacing_jump (single_succ_edge (b),
+ single_succ (b),
(mode & CLEANUP_CFGLAYOUT) != 0))
{
update_forwarder_flag (b);
if (mode & CLEANUP_CROSSJUMP)
remove_fake_exit_edges ();
- clear_aux_for_blocks ();
+ FOR_ALL_BB (b)
+ b->flags &= ~(BB_FORWARDER_BLOCK | BB_NONTHREADABLE_BLOCK);
return changed_overall;
}
for (bb = ENTRY_BLOCK_PTR->next_bb; bb != EXIT_BLOCK_PTR; )
{
- if (EDGE_COUNT (bb->succs) == 1
- && can_merge_blocks_p (bb, EDGE_SUCC (bb, 0)->dest))
+ if (single_succ_p (bb)
+ && can_merge_blocks_p (bb, single_succ (bb)))
{
/* Merge the blocks and retry. */
- merge_blocks (bb, EDGE_SUCC (bb, 0)->dest);
+ merge_blocks (bb, single_succ (bb));
changed = true;
continue;
}
delete_dead_jumptables ();
}
- /* Kill the data we won't maintain. */
- free_EXPR_LIST_list (&label_value_list);
timevar_pop (TV_CLEANUP_CFG);
return changed;
}
+\f
+static void
+rest_of_handle_jump (void)
+{
+ delete_unreachable_blocks ();
+
+ if (cfun->tail_call_emit)
+ fixup_tail_calls ();
+}
+
+struct tree_opt_pass pass_jump =
+{
+ "sibling", /* name */
+ NULL, /* gate */
+ rest_of_handle_jump, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_JUMP, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ TODO_ggc_collect, /* todo_flags_start */
+ TODO_dump_func |
+ TODO_verify_flow, /* todo_flags_finish */
+ 'i' /* letter */
+};
+
+
+static void
+rest_of_handle_jump2 (void)
+{
+ /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
+ before jump optimization switches branch directions. */
+ if (flag_guess_branch_prob)
+ expected_value_to_br_prob ();
+
+ delete_trivially_dead_insns (get_insns (), max_reg_num ());
+ reg_scan (get_insns (), max_reg_num ());
+ if (dump_file)
+ dump_flow_info (dump_file);
+ cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
+ | (flag_thread_jumps ? CLEANUP_THREADING : 0));
+
+ create_loop_notes ();
+
+ purge_line_number_notes ();
+
+ if (optimize)
+ cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
+
+ /* Jump optimization, and the removal of NULL pointer checks, may
+ have reduced the number of instructions substantially. CSE, and
+ future passes, allocate arrays whose dimensions involve the
+ maximum instruction UID, so if we can reduce the maximum UID
+ we'll save big on memory. */
+ renumber_insns (dump_file);
+}
+
+
+struct tree_opt_pass pass_jump2 =
+{
+ "jump", /* name */
+ NULL, /* gate */
+ rest_of_handle_jump2, /* execute */
+ NULL, /* sub */
+ NULL, /* next */
+ 0, /* static_pass_number */
+ TV_JUMP, /* tv_id */
+ 0, /* properties_required */
+ 0, /* properties_provided */
+ 0, /* properties_destroyed */
+ TODO_ggc_collect, /* todo_flags_start */
+ TODO_dump_func, /* todo_flags_finish */
+ 'j' /* letter */
+};
+
+
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