/* Natural loop discovery code for GNU compiler.
- Copyright (C) 2000, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008
+ Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
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, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "tree-flow.h"
#include "pointer-set.h"
#include "output.h"
+#include "ggc.h"
static void flow_loops_cfg_dump (FILE *);
-static void establish_preds (struct loop *);
\f
/* Dump loop related CFG information. */
bool
flow_loop_nested_p (const struct loop *outer, const struct loop *loop)
{
- return (loop->depth > outer->depth
- && loop->pred[outer->depth] == outer);
+ unsigned odepth = loop_depth (outer);
+
+ return (loop_depth (loop) > odepth
+ && VEC_index (loop_p, loop->superloops, odepth) == outer);
}
/* Returns the loop such that LOOP is nested DEPTH (indexed from zero)
struct loop *
superloop_at_depth (struct loop *loop, unsigned depth)
{
- gcc_assert (depth <= (unsigned) loop->depth);
+ unsigned ldepth = loop_depth (loop);
+
+ gcc_assert (depth <= ldepth);
- if (depth == (unsigned) loop->depth)
+ if (depth == ldepth)
return loop;
- return loop->pred[depth];
+ return VEC_index (loop_p, loop->superloops, depth);
}
/* Returns the list of the latch edges of LOOP. */
}
fprintf (file, ";; depth %d, outer %ld\n",
- loop->depth, (long) (loop->outer ? loop->outer->num : -1));
+ loop_depth (loop), (long) (loop_outer (loop)
+ ? loop_outer (loop)->num : -1));
fprintf (file, ";; nodes:");
bbs = get_loop_body (loop);
}
/* Free data allocated for LOOP. */
+
void
flow_loop_free (struct loop *loop)
{
struct loop_exit *exit, *next;
- if (loop->pred)
- free (loop->pred);
+ VEC_free (loop_p, gc, loop->superloops);
/* Break the list of the loop exit records. They will be freed when the
corresponding edge is rescanned or removed, and this avoids
accessing the (already released) head of the list stored in the
loop structure. */
- for (exit = loop->exits.next; exit != &loop->exits; exit = next)
+ for (exit = loop->exits->next; exit != loop->exits; exit = next)
{
next = exit->next;
exit->next = exit;
exit->prev = exit;
}
-
- free (loop);
+
+ ggc_free (loop->exits);
+ ggc_free (loop);
}
/* Free all the memory allocated for LOOPS. */
flow_loop_free (loop);
}
- VEC_free (loop_p, heap, loops->larray);
- loops->larray = NULL;
+ VEC_free (loop_p, gc, loops->larray);
}
}
int num_nodes = 1;
edge latch;
edge_iterator latch_ei;
+ unsigned depth = loop_depth (loop);
header->loop_father = loop;
- header->loop_depth = loop->depth;
+ header->loop_depth = depth;
FOR_EACH_EDGE (latch, latch_ei, loop->header->preds)
{
num_nodes++;
VEC_safe_push (basic_block, heap, stack, latch->src);
latch->src->loop_father = loop;
- latch->src->loop_depth = loop->depth;
+ latch->src->loop_depth = depth;
while (!VEC_empty (basic_block, stack))
{
if (ancestor->loop_father != loop)
{
ancestor->loop_father = loop;
- ancestor->loop_depth = loop->depth;
+ ancestor->loop_depth = depth;
num_nodes++;
VEC_safe_push (basic_block, heap, stack, ancestor);
}
return num_nodes;
}
+/* Records the vector of superloops of the loop LOOP, whose immediate
+ superloop is FATHER. */
+
static void
-establish_preds (struct loop *loop)
+establish_preds (struct loop *loop, struct loop *father)
{
- struct loop *ploop, *father = loop->outer;
-
- loop->depth = father->depth + 1;
-
- /* Remember the current loop depth if it is the largest seen so far. */
- cfun->max_loop_depth = MAX (cfun->max_loop_depth, loop->depth);
+ loop_p ploop;
+ unsigned depth = loop_depth (father) + 1;
+ unsigned i;
- if (loop->pred)
- free (loop->pred);
- loop->pred = XNEWVEC (struct loop *, loop->depth);
- memcpy (loop->pred, father->pred, sizeof (struct loop *) * father->depth);
- loop->pred[father->depth] = father;
+ VEC_truncate (loop_p, loop->superloops, 0);
+ VEC_reserve (loop_p, gc, loop->superloops, depth);
+ for (i = 0; VEC_iterate (loop_p, father->superloops, i, ploop); i++)
+ VEC_quick_push (loop_p, loop->superloops, ploop);
+ VEC_quick_push (loop_p, loop->superloops, father);
for (ploop = loop->inner; ploop; ploop = ploop->next)
- establish_preds (ploop);
+ establish_preds (ploop, loop);
}
/* Add LOOP to the loop hierarchy tree where FATHER is father of the
{
loop->next = father->inner;
father->inner = loop;
- loop->outer = father;
- establish_preds (loop);
+ establish_preds (loop, father);
}
/* Remove LOOP from the loop hierarchy tree. */
{
struct loop *prev, *father;
- father = loop->outer;
- loop->outer = NULL;
+ father = loop_outer (loop);
/* Remove loop from the list of sons. */
if (father->inner == loop)
father->inner = loop->next;
else
{
- for (prev = father->inner; prev->next != loop; prev = prev->next);
+ for (prev = father->inner; prev->next != loop; prev = prev->next)
+ continue;
prev->next = loop->next;
}
- loop->depth = -1;
- free (loop->pred);
- loop->pred = NULL;
+ VEC_truncate (loop_p, loop->superloops, 0);
}
/* Allocates and returns new loop structure. */
struct loop *
alloc_loop (void)
{
- struct loop *loop = XCNEW (struct loop);
+ struct loop *loop = GGC_CNEW (struct loop);
+
+ loop->exits = GGC_CNEW (struct loop_exit);
+ loop->exits->next = loop->exits->prev = loop->exits;
+ loop->can_be_parallel = false;
+ loop->single_iv = NULL_TREE;
- loop->exits.next = loop->exits.prev = &loop->exits;
return loop;
}
+/* Initializes loops structure LOOPS, reserving place for NUM_LOOPS loops
+ (including the root of the loop tree). */
+
+static void
+init_loops_structure (struct loops *loops, unsigned num_loops)
+{
+ struct loop *root;
+
+ memset (loops, 0, sizeof *loops);
+ loops->larray = VEC_alloc (loop_p, gc, num_loops);
+
+ /* Dummy loop containing whole function. */
+ root = alloc_loop ();
+ root->num_nodes = n_basic_blocks;
+ root->latch = EXIT_BLOCK_PTR;
+ root->header = ENTRY_BLOCK_PTR;
+ ENTRY_BLOCK_PTR->loop_father = root;
+ EXIT_BLOCK_PTR->loop_father = root;
+
+ VEC_quick_push (loop_p, loops->larray, root);
+ loops->tree_root = root;
+}
+
/* Find all the natural loops in the function and save in LOOPS structure and
recalculate loop_depth information in basic block structures.
Return the number of natural loops found. */
int *rc_order;
basic_block header;
basic_block bb;
- struct loop *root;
- memset (loops, 0, sizeof *loops);
-
- /* We are going to recount the maximum loop depth,
- so throw away the last count. */
- cfun->max_loop_depth = 0;
+ /* Ensure that the dominators are computed. */
+ calculate_dominance_info (CDI_DOMINATORS);
/* Taking care of this degenerate case makes the rest of
this code simpler. */
if (n_basic_blocks == NUM_FIXED_BLOCKS)
- return 0;
+ {
+ init_loops_structure (loops, 1);
+ return 1;
+ }
dfs_order = NULL;
rc_order = NULL;
- /* Ensure that the dominators are computed. */
- calculate_dominance_info (CDI_DOMINATORS);
-
/* Count the number of loop headers. This should be the
same as the number of natural loops. */
headers = sbitmap_alloc (last_basic_block);
}
/* Allocate loop structures. */
- loops->larray = VEC_alloc (loop_p, heap, num_loops + 1);
-
- /* Dummy loop containing whole function. */
- root = alloc_loop ();
- root->num_nodes = n_basic_blocks;
- root->latch = EXIT_BLOCK_PTR;
- root->header = ENTRY_BLOCK_PTR;
- ENTRY_BLOCK_PTR->loop_father = root;
- EXIT_BLOCK_PTR->loop_father = root;
-
- VEC_quick_push (loop_p, loops->larray, root);
- loops->tree_root = root;
+ init_loops_structure (loops, num_loops + 1);
/* Find and record information about all the natural loops
in the CFG. */
sbitmap_free (headers);
loops->exits = NULL;
- loops->state = 0;
return VEC_length (loop_p, loops->larray);
}
profile is usually too flat and unreliable for this (and it is mostly based
on the loop structure of the program, so it does not make much sense to
derive the loop structure from it). */
-
+
static edge
find_subloop_latch_edge_by_profile (VEC (edge, heap) *latches)
{
another edge. */
static edge
-find_subloop_latch_edge_by_ivs (struct loop *loop, VEC (edge, heap) *latches)
+find_subloop_latch_edge_by_ivs (struct loop *loop ATTRIBUTE_UNUSED, VEC (edge, heap) *latches)
{
edge e, latch = VEC_index (edge, latches, 0);
unsigned i;
- tree phi, lop;
+ gimple phi;
+ gimple_stmt_iterator psi;
+ tree lop;
basic_block bb;
/* Find the candidate for the latch edge. */
/* Check for a phi node that would deny that this is a latch edge of
a subloop. */
- for (phi = phi_nodes (loop->header); phi; phi = PHI_CHAIN (phi))
+ for (psi = gsi_start_phis (loop->header); !gsi_end_p (psi); gsi_next (&psi))
{
+ phi = gsi_stmt (psi);
lop = PHI_ARG_DEF_FROM_EDGE (phi, latch);
/* Ignore the values that are not changed inside the subloop. */
if (TREE_CODE (lop) != SSA_NAME
|| SSA_NAME_DEF_STMT (lop) == phi)
continue;
- bb = bb_for_stmt (SSA_NAME_DEF_STMT (lop));
+ bb = gimple_bb (SSA_NAME_DEF_STMT (lop));
if (!bb || !flow_bb_inside_loop_p (loop, bb))
continue;
edge_iterator ei;
edge e, new_entry;
struct loop *new_loop;
-
+
mfb_reis_set = pointer_set_create ();
FOR_EACH_EDGE (e, ei, loop->header->preds)
{
{
edge e;
- /* We eliminate the mutiple latches by splitting the header to the forwarder
+ /* We eliminate the multiple latches by splitting the header to the forwarder
block F and the rest R, and redirecting the edges. There are two cases:
1) If there is a latch edge E that corresponds to a subloop (we guess
/* Return nonzero if basic block BB belongs to LOOP. */
bool
-flow_bb_inside_loop_p (const struct loop *loop, const basic_block bb)
+flow_bb_inside_loop_p (const struct loop *loop, const_basic_block bb)
{
struct loop *source_loop;
/* Enumeration predicate for get_loop_body_with_size. */
static bool
-glb_enum_p (basic_block bb, void *glb_loop)
+glb_enum_p (const_basic_block bb, const void *glb_loop)
{
- struct loop *loop = glb_loop;
+ const struct loop *const loop = (const struct loop *) glb_loop;
return (bb != loop->header
&& dominated_by_p (CDI_DOMINATORS, bb, loop->header));
}
unsigned max_size)
{
return dfs_enumerate_from (loop->header, 1, glb_enum_p,
- body, max_size, (void *) loop);
+ body, max_size, loop);
}
/* Gets basic blocks of a LOOP. Header is the 0-th block, rest is in dfs
return tovisit;
}
+/* Gets body of a LOOP sorted via provided BB_COMPARATOR. */
+
+basic_block *
+get_loop_body_in_custom_order (const struct loop *loop,
+ int (*bb_comparator) (const void *, const void *))
+{
+ basic_block *bbs = get_loop_body (loop);
+
+ qsort (bbs, loop->num_nodes, sizeof (basic_block), bb_comparator);
+
+ return bbs;
+}
+
/* Get body of a LOOP in breadth first sort order. */
basic_block *
static hashval_t
loop_exit_hash (const void *ex)
{
- struct loop_exit *exit = (struct loop_exit *) ex;
+ const struct loop_exit *const exit = (const struct loop_exit *) ex;
return htab_hash_pointer (exit->e);
}
static int
loop_exit_eq (const void *ex, const void *e)
{
- struct loop_exit *exit = (struct loop_exit *) ex;
+ const struct loop_exit *const exit = (const struct loop_exit *) ex;
return exit->e == e;
}
for (; exit; exit = next)
{
next = exit->next_e;
-
+
exit->next->prev = exit->prev;
exit->prev->next = exit->next;
- free (exit);
+ ggc_free (exit);
}
}
static struct loop_exit *
get_exit_descriptions (edge e)
{
- return htab_find_with_hash (current_loops->exits, e,
- htab_hash_pointer (e));
+ return (struct loop_exit *) htab_find_with_hash (current_loops->exits, e,
+ htab_hash_pointer (e));
}
/* Updates the lists of loop exits in that E appears.
struct loop_exit *exits = NULL, *exit;
struct loop *aloop, *cloop;
- if ((current_loops->state & LOOPS_HAVE_RECORDED_EXITS) == 0)
+ if (!loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))
return;
if (!removed
cloop = find_common_loop (e->src->loop_father, e->dest->loop_father);
for (aloop = e->src->loop_father;
aloop != cloop;
- aloop = aloop->outer)
+ aloop = loop_outer (aloop))
{
- exit = XNEW (struct loop_exit);
+ exit = GGC_NEW (struct loop_exit);
exit->e = e;
- exit->next = aloop->exits.next;
- exit->prev = &aloop->exits;
+ exit->next = aloop->exits->next;
+ exit->prev = aloop->exits;
exit->next->prev = exit;
exit->prev->next = exit;
exit->next_e = exits;
exits = exit;
}
- }
+ }
if (!exits && new_edge)
return;
edge_iterator ei;
edge e;
- if (current_loops->state & LOOPS_HAVE_RECORDED_EXITS)
+ if (!current_loops)
return;
- current_loops->state |= LOOPS_HAVE_RECORDED_EXITS;
+
+ if (loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))
+ return;
+ loops_state_set (LOOPS_HAVE_RECORDED_EXITS);
gcc_assert (current_loops->exits == NULL);
- current_loops->exits = htab_create (2 * number_of_loops (),
- loop_exit_hash,
- loop_exit_eq,
- loop_exit_free);
+ current_loops->exits = htab_create_alloc (2 * number_of_loops (),
+ loop_exit_hash,
+ loop_exit_eq,
+ loop_exit_free,
+ ggc_calloc, ggc_free);
FOR_EACH_BB (bb)
{
static int
dump_recorded_exit (void **slot, void *file)
{
- struct loop_exit *exit = *slot;
+ struct loop_exit *exit = (struct loop_exit *) *slot;
unsigned n = 0;
edge e = exit->e;
for (; exit != NULL; exit = exit->next_e)
n++;
- fprintf (file, "Edge %d->%d exits %u loops\n",
+ fprintf ((FILE*) file, "Edge %d->%d exits %u loops\n",
e->src->index, e->dest->index, n);
return 1;
void
release_recorded_exits (void)
{
- gcc_assert (current_loops->state & LOOPS_HAVE_RECORDED_EXITS);
+ gcc_assert (loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS));
htab_delete (current_loops->exits);
current_loops->exits = NULL;
- current_loops->state &= ~LOOPS_HAVE_RECORDED_EXITS;
+ loops_state_clear (LOOPS_HAVE_RECORDED_EXITS);
}
/* Returns the list of the exit edges of a LOOP. */
/* If we maintain the lists of exits, use them. Otherwise we must
scan the body of the loop. */
- if (current_loops->state & LOOPS_HAVE_RECORDED_EXITS)
+ if (loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))
{
- for (exit = loop->exits.next; exit->e; exit = exit->next)
+ for (exit = loop->exits->next; exit->e; exit = exit->next)
VEC_safe_push (edge, heap, edges, exit->e);
}
else
void
add_bb_to_loop (basic_block bb, struct loop *loop)
{
- int i;
+ unsigned i;
+ loop_p ploop;
edge_iterator ei;
edge e;
gcc_assert (bb->loop_father == NULL);
bb->loop_father = loop;
- bb->loop_depth = loop->depth;
+ bb->loop_depth = loop_depth (loop);
loop->num_nodes++;
- for (i = 0; i < loop->depth; i++)
- loop->pred[i]->num_nodes++;
+ for (i = 0; VEC_iterate (loop_p, loop->superloops, i, ploop); i++)
+ ploop->num_nodes++;
FOR_EACH_EDGE (e, ei, bb->succs)
{
{
int i;
struct loop *loop = bb->loop_father;
+ loop_p ploop;
edge_iterator ei;
edge e;
gcc_assert (loop != NULL);
loop->num_nodes--;
- for (i = 0; i < loop->depth; i++)
- loop->pred[i]->num_nodes--;
+ for (i = 0; VEC_iterate (loop_p, loop->superloops, i, ploop); i++)
+ ploop->num_nodes--;
bb->loop_father = NULL;
bb->loop_depth = 0;
struct loop *
find_common_loop (struct loop *loop_s, struct loop *loop_d)
{
+ unsigned sdepth, ddepth;
+
if (!loop_s) return loop_d;
if (!loop_d) return loop_s;
- if (loop_s->depth < loop_d->depth)
- loop_d = loop_d->pred[loop_s->depth];
- else if (loop_s->depth > loop_d->depth)
- loop_s = loop_s->pred[loop_d->depth];
+ sdepth = loop_depth (loop_s);
+ ddepth = loop_depth (loop_d);
+
+ if (sdepth < ddepth)
+ loop_d = VEC_index (loop_p, loop_d->superloops, sdepth);
+ else if (sdepth > ddepth)
+ loop_s = VEC_index (loop_p, loop_s->superloops, ddepth);
while (loop_s != loop_d)
{
- loop_s = loop_s->outer;
- loop_d = loop_d->outer;
+ loop_s = loop_outer (loop_s);
+ loop_d = loop_outer (loop_d);
}
return loop_s;
}
{
basic_block *bbs;
unsigned i;
+ struct loop *outer = loop_outer (loop);
gcc_assert (!loop->inner);
/* Move blocks up one level (they should be removed as soon as possible). */
bbs = get_loop_body (loop);
for (i = 0; i < loop->num_nodes; i++)
- bbs[i]->loop_father = loop->outer;
+ bbs[i]->loop_father = outer;
delete_loop (loop);
}
sizes[0] = 2;
FOR_EACH_BB (bb)
- for (loop = bb->loop_father; loop; loop = loop->outer)
+ for (loop = bb->loop_father; loop; loop = loop_outer (loop))
sizes[loop->num]++;
FOR_EACH_LOOP (li, loop, LI_INCLUDE_ROOT)
{
i = loop->num;
- if ((current_loops->state & LOOPS_HAVE_PREHEADERS)
+ if (loops_state_satisfies_p (LOOPS_HAVE_PREHEADERS)
&& EDGE_COUNT (loop->header->preds) != 2)
{
error ("loop %d's header does not have exactly 2 entries", i);
err = 1;
}
- if (current_loops->state & LOOPS_HAVE_SIMPLE_LATCHES)
+ if (loops_state_satisfies_p (LOOPS_HAVE_SIMPLE_LATCHES))
{
if (!single_succ_p (loop->latch))
{
error ("loop %d's header does not belong directly to it", i);
err = 1;
}
- if ((current_loops->state & LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
+ if (loops_state_satisfies_p (LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
&& (loop_latch_edge (loop)->flags & EDGE_IRREDUCIBLE_LOOP))
{
error ("loop %d's latch is marked as part of irreducible region", i);
}
/* Check irreducible loops. */
- if (current_loops->state & LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS)
+ if (loops_state_satisfies_p (LOOPS_HAVE_MARKED_IRREDUCIBLE_REGIONS))
{
/* Record old info. */
irreds = sbitmap_alloc (last_basic_block);
/* Check the recorded loop exits. */
FOR_EACH_LOOP (li, loop, 0)
{
- if (loop->exits.e != NULL)
+ if (!loop->exits || loop->exits->e != NULL)
{
error ("corrupted head of the exits list of loop %d",
loop->num);
{
/* Check that the list forms a cycle, and all elements except
for the head are nonnull. */
- for (mexit = &loop->exits, exit = mexit->next, i = 0;
+ for (mexit = loop->exits, exit = mexit->next, i = 0;
exit->e && exit != mexit;
exit = exit->next)
{
mexit = mexit->next;
}
- if (exit != &loop->exits)
+ if (exit != loop->exits)
{
error ("corrupted exits list of loop %d", loop->num);
err = 1;
}
}
- if ((current_loops->state & LOOPS_HAVE_RECORDED_EXITS) == 0)
+ if (!loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))
{
- if (loop->exits.next != &loop->exits)
+ if (loop->exits->next != loop->exits)
{
error ("nonempty exits list of loop %d, but exits are not recorded",
loop->num);
}
}
- if (current_loops->state & LOOPS_HAVE_RECORDED_EXITS)
+ if (loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))
{
unsigned n_exits = 0, eloops;
exit = get_exit_descriptions (e);
if (!exit)
{
- error ("Exit %d->%d not recorded",
+ error ("Exit %d->%d not recorded",
e->src->index, e->dest->index);
err = 1;
}
for (loop = bb->loop_father;
loop != e->dest->loop_father;
- loop = loop->outer)
+ loop = loop_outer (loop))
{
eloops--;
sizes[loop->num]++;
if (eloops != 0)
{
- error ("Wrong list of exited loops for edge %d->%d",
+ error ("Wrong list of exited loops for edge %d->%d",
e->src->index, e->dest->index);
err = 1;
}
FOR_EACH_LOOP (li, loop, 0)
{
eloops = 0;
- for (exit = loop->exits.next; exit->e; exit = exit->next)
+ for (exit = loop->exits->next; exit->e; exit = exit->next)
eloops++;
if (eloops != sizes[loop->num])
{
edge e;
edge_iterator ei;
+ gcc_assert (loops_state_satisfies_p (LOOPS_HAVE_PREHEADERS));
+
FOR_EACH_EDGE (e, ei, loop->header->preds)
if (e->src != loop->latch)
break;
/* Returns true if E is an exit of LOOP. */
bool
-loop_exit_edge_p (const struct loop *loop, edge e)
+loop_exit_edge_p (const struct loop *loop, const_edge e)
{
return (flow_bb_inside_loop_p (loop, e->src)
&& !flow_bb_inside_loop_p (loop, e->dest));
edge
single_exit (const struct loop *loop)
{
- struct loop_exit *exit = loop->exits.next;
+ struct loop_exit *exit = loop->exits->next;
- if ((current_loops->state & LOOPS_HAVE_RECORDED_EXITS) == 0)
+ if (!loops_state_satisfies_p (LOOPS_HAVE_RECORDED_EXITS))
return NULL;
- if (exit->e && exit->next == &loop->exits)
+ if (exit->e && exit->next == loop->exits)
return exit->e;
else
return NULL;
}
+
+/* Returns true when BB has an edge exiting LOOP. */
+
+bool
+is_loop_exit (struct loop *loop, basic_block bb)
+{
+ edge e;
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ if (loop_exit_edge_p (loop, e))
+ return true;
+
+ return false;
+}
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