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cfglayout.c (cfg_layout_duplicate_bb): Do not update frequencies at all if edge is not specified.

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* cfglayout.c (cfg_layout_duplicate_bb): Do not update frequencies
	at all if edge is not specified.
	(can_copy_bbs_p, copy_bbs): New.
	* cfglayout.h (can_copy_bbs_p, copy_bbs): Declare.
	* cfgloop.c (get_loop_body): Comment more precisely.
	* cfgloopmanip.c (copy_bbs, record_exit_edges): Removed.
	(scale_bbs_frequencies): Fix comment typo.
	(can_duplicate_loop_p): Use can_copy_bbs_p.
	(duplicate_loop_to_header_edge): Simplify by using copy_bbs.

From-SVN: r68906
This commit is contained in:
Zdenek Dvorak 2003-07-04 01:50:05 +02:00 committed by Zdenek Dvorak
parent 694abeb6a7
commit 8d28e87da7
5 changed files with 248 additions and 292 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
gcc/ChangeLog
View File

@ -1,3 +1,15 @@
2003-07-03 Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>
* cfglayout.c (cfg_layout_duplicate_bb): Do not update frequencies
at all if edge is not specified.
(can_copy_bbs_p, copy_bbs): New.
* cfglayout.h (can_copy_bbs_p, copy_bbs): Declare.
* cfgloop.c (get_loop_body): Comment more precisely.
* cfgloopmanip.c (copy_bbs, record_exit_edges): Removed.
(scale_bbs_frequencies): Fix comment typo.
(can_duplicate_loop_p): Use can_copy_bbs_p.
(duplicate_loop_to_header_edge): Simplify by using copy_bbs.
2003-07-03 Devang Patel <dpatel@apple.com>
* c-opts.c (c_common_parse_file): Remove extra

156
gcc/cfglayout.c
View File

@ -985,7 +985,9 @@ duplicate_insn_chain (rtx from, rtx to)
delete_insn (last);
return insn;
}
/* Create a duplicate of the basic block BB and redirect edge E into it. */
/* Create a duplicate of the basic block BB and redirect edge E into it.
If E is not specified, BB is just copied, but updating the frequencies
etc. is left to the caller. */
basic_block
cfg_layout_duplicate_bb (basic_block bb, edge e)
@ -1046,32 +1048,41 @@ cfg_layout_duplicate_bb (basic_block bb, edge e)
is no need to actually check for duplicated edges. */
n = unchecked_make_edge (new_bb, s->dest, s->flags);
n->probability = s->probability;
if (new_count)
/* Take care for overflows! */
n->count = s->count * (new_count * 10000 / bb->count) / 10000;
if (e && bb->count)
{
/* Take care for overflows! */
n->count = s->count * (new_count * 10000 / bb->count) / 10000;
s->count -= n->count;
}
else
n->count = 0;
s->count -= n->count;
n->count = s->count;
n->aux = s->aux;
}
new_bb->count = new_count;
bb->count -= new_count;
if (e)
{
new_bb->count = new_count;
bb->count -= new_count;
new_bb->frequency = EDGE_FREQUENCY (e);
bb->frequency -= EDGE_FREQUENCY (e);
redirect_edge_and_branch_force (e, new_bb);
}
if (bb->count < 0)
bb->count = 0;
if (bb->frequency < 0)
bb->frequency = 0;
if (bb->count < 0)
bb->count = 0;
if (bb->frequency < 0)
bb->frequency = 0;
}
else
{
new_bb->count = bb->count;
new_bb->frequency = bb->frequency;
}
new_bb->rbi->original = bb;
bb->rbi->copy = new_bb;
return new_bb;
}
@ -1167,4 +1178,121 @@ cfg_layout_finalize (void)
#endif
}
/* Checks whether all N blocks in BBS array can be copied. */
bool
can_copy_bbs_p (basic_block *bbs, unsigned n)
{
unsigned i;
edge e;
int ret = true;
for (i = 0; i < n; i++)
bbs[i]->rbi->duplicated = 1;
for (i = 0; i < n; i++)
{
/* In case we should redirect abnormal edge during duplication, fail. */
for (e = bbs[i]->succ; e; e = e->succ_next)
if ((e->flags & EDGE_ABNORMAL)
&& e->dest->rbi->duplicated)
{
ret = false;
goto end;
}
if (!cfg_layout_can_duplicate_bb_p (bbs[i]))
{
ret = false;
break;
}
}
end:
for (i = 0; i < n; i++)
bbs[i]->rbi->duplicated = 0;
return ret;
}
/* Duplicates N basic blocks stored in array BBS. Newly created basic blocks
are placed into array NEW_BBS in the same order. Edges from basic blocks
in BBS are also duplicated and copies of those of them
that lead into BBS are redirected to appropriate newly created block. The
function assigns bbs into loops (copy of basic block bb is assigned to
bb->loop_father->copy loop, so this must be set up correctly in advance)
and updates dominators locally (LOOPS structure that contains the information
about dominators is passed to enable this).
BASE is the superloop to that basic block belongs; if its header or latch
is copied, we do not set the new blocks as header or latch.
Created copies of N_EDGES edges in array EDGES are stored in array NEW_EDGES,
also in the same order. */
void
copy_bbs (basic_block *bbs, unsigned n, basic_block *new_bbs,
edge *edges, unsigned n_edges, edge *new_edges,
struct loop *base, struct loops *loops)
{
unsigned i, j;
basic_block bb, new_bb, dom_bb;
edge e;
/* Duplicate bbs, update dominators, assign bbs to loops. */
for (i = 0; i < n; i++)
{
/* Duplicate. */
bb = bbs[i];
new_bb = new_bbs[i] = cfg_layout_duplicate_bb (bb, NULL);
bb->rbi->duplicated = 1;
/* Add to loop. */
add_bb_to_loop (new_bb, bb->loop_father->copy);
add_to_dominance_info (loops->cfg.dom, new_bb);
/* Possibly set header. */
if (bb->loop_father->header == bb && bb->loop_father != base)
new_bb->loop_father->header = new_bb;
/* Or latch. */
if (bb->loop_father->latch == bb && bb->loop_father != base)
new_bb->loop_father->latch = new_bb;
}
/* Set dominators. */
for (i = 0; i < n; i++)
{
bb = bbs[i];
new_bb = new_bbs[i];
dom_bb = get_immediate_dominator (loops->cfg.dom, bb);
if (dom_bb->rbi->duplicated)
{
dom_bb = dom_bb->rbi->copy;
set_immediate_dominator (loops->cfg.dom, new_bb, dom_bb);
}
}
/* Redirect edges. */
for (j = 0; j < n_edges; j++)
new_edges[j] = NULL;
for (i = 0; i < n; i++)
{
new_bb = new_bbs[i];
bb = bbs[i];
for (e = new_bb->succ; e; e = e->succ_next)
{
for (j = 0; j < n_edges; j++)
if (edges[j] && edges[j]->src == bb && edges[j]->dest == e->dest)
new_edges[j] = e;
if (!e->dest->rbi->duplicated)
continue;
redirect_edge_and_branch_force (e, e->dest->rbi->copy);
}
}
/* Clear information about duplicates. */
for (i = 0; i < n; i++)
bbs[i]->rbi->duplicated = 0;
}
#include "gt-cfglayout.h"

3
gcc/cfglayout.h
View File

@ -41,4 +41,7 @@ extern bool cfg_layout_can_duplicate_bb_p (basic_block);
extern basic_block cfg_layout_duplicate_bb (basic_block, edge);
extern void insn_locators_initialize (void);
extern void reemit_insn_block_notes (void);
extern bool can_copy_bbs_p (basic_block *, unsigned);
extern void copy_bbs (basic_block *, unsigned, basic_block *,
edge *, unsigned, edge *, struct loop *, struct loops *);
extern void cfg_layout_initialize_rbi (basic_block);

4
gcc/cfgloop.c
View File

@ -960,7 +960,9 @@ glb_enum_p (basic_block bb, void *glb_header)
return bb != (basic_block) glb_header;
}
/* Gets basic blocks of a loop. */
/* Gets basic blocks of a LOOP. Header is the 0-th block, rest is in dfs
order against direction of edges from latch. Specially, if
header != latch, latch is the 1-st block. */
basic_block *
get_loop_body (const struct loop *loop)
{

365
gcc/cfgloopmanip.c
View File

@ -36,8 +36,6 @@ static void copy_loops_to (struct loops *, struct loop **, int,
struct loop *);
static void loop_redirect_edge (edge, basic_block);
static bool loop_delete_branch_edge (edge, int);
static void copy_bbs (basic_block *, int, edge, edge, basic_block **,
struct loops *, edge *, edge *, int);
static void remove_bbs (dominance_info, basic_block *, int);
static bool rpe_enum_p (basic_block, void *);
static int find_path (edge, dominance_info, basic_block **);
@ -49,8 +47,6 @@ static void fix_bb_placements (struct loops *, basic_block);
static void place_new_loop (struct loops *, struct loop *);
static void scale_loop_frequencies (struct loop *, int, int);
static void scale_bbs_frequencies (basic_block *, int, int, int);
static void record_exit_edges (edge, basic_block *, int, edge *, unsigned *,
int);
static basic_block create_preheader (struct loop *, dominance_info, int);
static void fix_irreducible_loops (basic_block);
@ -820,219 +816,31 @@ loop_delete_branch_edge (edge e, int really_delete)
return false; /* To avoid warning, cannot get here. */
}
/* Duplicates N basic blocks stored in array BBS (they form a body of
duplicated loop). Newly created basic blocks are placed into array NEW_BBS
that we allocate. Edges from basic blocks in BBS are also duplicated and
copies of those of them that lead into BBS are redirected to appropriate
newly created block. The function also assigns bbs into loops and updates
dominators. If ADD_IRREDUCIBLE_FLAG is set, newly created basic blocks that
are not members of any inner loop are marked irreducible.
Additionally, we perform following manipulation with edges:
We have two special edges given. LATCH_EDGE is the latch edge of the
duplicated loop and leads into its header (one of blocks in BBS);
it does not have necessarily lead from one of the blocks, because
we may be copying the loop body several times in unrolling.
Edge ENTRY leads also leads to header, and it is either latch or entry
edge. Copy of LATCH_EDGE is redirected to header and is stored in
HEADER_EDGE, the ENTRY edge is redirected into copy of header and
returned as COPY_HEADER_EDGE. The effect is following:
if LATCH_EDGE == ENTRY, then the loop is unrolled by one copy,
HEADER_EDGE is latch of a new loop, COPY_HEADER_EDGE leads from original
latch source to first block in copy.
if LATCH_EDGE != ENTRY, then the loop is peeled by one copy,
HEADER_EDGE is entry edge of the loop, COPY_HEADER_EDGE leads from
original entry block to first block in peeled copy.
*/
static void
copy_bbs (basic_block *bbs, int n, edge entry, edge latch_edge,
basic_block **new_bbs, struct loops *loops, edge *header_edge,
edge *copy_header_edge, int add_irreducible_flag)
{
int i;
basic_block bb, new_bb, header = entry->dest, dom_bb;
edge e;
/* Duplicate bbs, update dominators, assign bbs to loops. */
(*new_bbs) = xcalloc (n, sizeof (basic_block));
for (i = 0; i < n; i++)
{
/* Duplicate. */
bb = bbs[i];
new_bb = (*new_bbs)[i] = cfg_layout_duplicate_bb (bb, NULL);
new_bb->rbi->duplicated = 1;
/* Add to loop. */
add_bb_to_loop (new_bb, bb->loop_father->copy);
add_to_dominance_info (loops->cfg.dom, new_bb);
/* Possibly set header. */
if (bb->loop_father->header == bb && bb != header)
new_bb->loop_father->header = new_bb;
/* Or latch. */
if (bb->loop_father->latch == bb &&
bb->loop_father != header->loop_father)
new_bb->loop_father->latch = new_bb;
/* Take care of irreducible loops. */
if (add_irreducible_flag
&& bb->loop_father == header->loop_father)
new_bb->flags |= BB_IRREDUCIBLE_LOOP;
}
/* Set dominators. */
for (i = 0; i < n; i++)
{
bb = bbs[i];
new_bb = (*new_bbs)[i];
if (bb != header)
{
/* For anything else than loop header, just copy it. */
dom_bb = get_immediate_dominator (loops->cfg.dom, bb);
dom_bb = dom_bb->rbi->copy;
}
else
{
/* Copy of header is dominated by entry source. */
dom_bb = entry->src;
}
if (!dom_bb)
abort ();
set_immediate_dominator (loops->cfg.dom, new_bb, dom_bb);
}
/* Redirect edges. */
for (i = 0; i < n; i++)
{
edge e_pred;
new_bb = (*new_bbs)[i];
bb = bbs[i];
for (e = bb->pred; e; e = e_pred)
{
basic_block src = e->src;
e_pred = e->pred_next;
if (!src->rbi->duplicated)
continue;
/* Leads to copied loop and it is not latch edge, redirect it. */
if (bb != header)
loop_redirect_edge (e, new_bb);
if (add_irreducible_flag
&& (bb->loop_father == header->loop_father
|| src->rbi->original->loop_father == header->loop_father))
e->flags |= EDGE_IRREDUCIBLE_LOOP;
}
}
/* Redirect header edge. */
bb = latch_edge->src->rbi->copy;
for (e = bb->succ; e->dest != latch_edge->dest; e = e->succ_next);
*header_edge = e;
loop_redirect_edge (*header_edge, header);
/* Redirect entry to copy of header. */
loop_redirect_edge (entry, header->rbi->copy);
*copy_header_edge = entry;
/* Clear information about duplicates. */
for (i = 0; i < n; i++)
(*new_bbs)[i]->rbi->duplicated = 0;
}
/* Check whether LOOP's body can be duplicated. */
bool
can_duplicate_loop_p (struct loop *loop)
{
basic_block *bbs;
unsigned i;
int ret;
basic_block *bbs = get_loop_body (loop);
bbs = get_loop_body (loop);
for (i = 0; i < loop->num_nodes; i++)
{
edge e;
/* In case loop contains abnormal edge we can not redirect,
we can't perform duplication. */
for (e = bbs[i]->succ; e; e = e->succ_next)
if ((e->flags & EDGE_ABNORMAL)
&& flow_bb_inside_loop_p (loop, e->dest))
{
free (bbs);
return false;
}
if (!cfg_layout_can_duplicate_bb_p (bbs[i]))
{
free (bbs);
return false;
}
}
ret = can_copy_bbs_p (bbs, loop->num_nodes);
free (bbs);
return true;
return ret;
}
/* Record edges, leading from NBBS basic blocks stored in BBS, that were created
by copying ORIG edge (or just ORIG edge if IS_ORIG is set).
If ORIG is NULL, then record all edges coming outside of BBS. Store them
into TO_REMOVE array that must be large enough to hold them all; their
number is returned in N_TO_REMOVE. */
static void
record_exit_edges (edge orig, basic_block *bbs, int nbbs, edge *to_remove,
unsigned int *n_to_remove, int is_orig)
{
sbitmap my_blocks;
int i;
edge e;
if (orig)
{
if (is_orig)
{
to_remove[(*n_to_remove)++] = orig;
return;
}
for (e = orig->src->rbi->copy->succ; e; e = e->succ_next)
if (e->dest == orig->dest)
break;
if (!e)
abort ();
to_remove[(*n_to_remove)++] = e;
}
else
{
my_blocks = sbitmap_alloc (last_basic_block);
sbitmap_zero (my_blocks);
for (i = 0; i < nbbs; i++)
SET_BIT (my_blocks, bbs[i]->index);
for (i = 0; i < nbbs; i++)
for (e = bbs[i]->succ; e; e = e->succ_next)
if (e->dest == EXIT_BLOCK_PTR ||
!TEST_BIT (my_blocks, e->dest->index))
to_remove[(*n_to_remove)++] = e;
free (my_blocks);
}
}
#define RDIV(X,Y) (((X) + (Y) / 2) / (Y))
/* Duplicates body of LOOP to given edge E NDUPL times. Takes care of
updating LOOPS structure and dominators. E's destination must be LOOP
header for this to work, i.e. it must be entry or latch edge of this loop;
these are unique, as the loops must have preheaders for this function to
work correctly (in case E is latch, the function unrolls the loop, if E is
entry edge, it peels the loop). Store edges created by copying ORIG edge
(if NULL, then all edges leaving loop) from copies corresponding to set
bits in WONT_EXIT bitmap (bit 0 corresponds to original LOOP body, the
other copies are numbered in order given by control flow through them)
into TO_REMOVE array. Returns false if duplication is impossible. */
/* Duplicates body of LOOP to given edge E NDUPL times. Takes care of updating
LOOPS structure and dominators. E's destination must be LOOP header for
this to work, i.e. it must be entry or latch edge of this loop; these are
unique, as the loops must have preheaders for this function to work
correctly (in case E is latch, the function unrolls the loop, if E is entry
edge, it peels the loop). Store edges created by copying ORIG edge from
copies corresponding to set bits in WONT_EXIT bitmap (bit 0 corresponds to
original LOOP body, the other copies are numbered in order given by control
flow through them) into TO_REMOVE array. Returns false if duplication is
impossible. */
int
duplicate_loop_to_header_edge (struct loop *loop, edge e, struct loops *loops,
unsigned int ndupl, sbitmap wont_exit,
@ -1045,7 +853,10 @@ duplicate_loop_to_header_edge (struct loop *loop, edge e, struct loops *loops,
basic_block header = loop->header, latch = loop->latch;
basic_block *new_bbs, *bbs, *first_active;
basic_block new_bb, bb, first_active_latch = NULL;
edge ae, latch_edge, he;
edge ae, latch_edge;
edge spec_edges[2], new_spec_edges[2];
#define SE_LATCH 0
#define SE_ORIG 1
unsigned i, j, n;
int is_latch = (latch == e->src);
int scale_act = 0, *scale_step = NULL, scale_main = 0;
@ -1070,17 +881,18 @@ duplicate_loop_to_header_edge (struct loop *loop, edge e, struct loops *loops,
bbs = get_loop_body (loop);
/* Check whether duplication is possible. */
for (i = 0; i < loop->num_nodes; i++)
if (!can_copy_bbs_p (bbs, loop->num_nodes))
{
if (!cfg_layout_can_duplicate_bb_p (bbs[i]))
{
free (bbs);
return false;
}
free (bbs);
return false;
}
new_bbs = xmalloc (sizeof (basic_block) * loop->num_nodes);
add_irreducible_flag = !is_latch && (e->flags & EDGE_IRREDUCIBLE_LOOP);
/* In case we are doing loop peeling and the loop is in the middle of
irreducible region, the peeled copies will be inside it too. */
add_irreducible_flag = e->flags & EDGE_IRREDUCIBLE_LOOP;
if (is_latch && add_irreducible_flag)
abort ();
/* Find edge from latch. */
latch_edge = loop_latch_edge (loop);
@ -1140,7 +952,7 @@ duplicate_loop_to_header_edge (struct loop *loop, edge e, struct loops *loops,
}
/* Loop the new bbs will belong to. */
target = find_common_loop (e->src->loop_father, e->dest->loop_father);
target = e->src->loop_father;
/* Original loops. */
n_orig_loops = 0;
@ -1152,19 +964,21 @@ duplicate_loop_to_header_edge (struct loop *loop, edge e, struct loops *loops,
loop->copy = target;
/* Original basic blocks. */
n = loop->num_nodes;
first_active = xcalloc(n, sizeof (basic_block));
first_active = xmalloc (n * sizeof (basic_block));
if (is_latch)
{
memcpy (first_active, bbs, n * sizeof (basic_block));
first_active_latch = latch;
}
/* Record exit edges in original loop body. */
if (TEST_BIT (wont_exit, 0))
record_exit_edges (orig, bbs, n, to_remove, n_to_remove, true);
/* Record exit edge in original loop body. */
if (orig && TEST_BIT (wont_exit, 0))
to_remove[(*n_to_remove)++] = orig;
spec_edges[SE_ORIG] = orig;
spec_edges[SE_LATCH] = latch_edge;
for (j = 0; j < ndupl; j++)
{
@ -1172,78 +986,75 @@ duplicate_loop_to_header_edge (struct loop *loop, edge e, struct loops *loops,
copy_loops_to (loops, orig_loops, n_orig_loops, target);
/* Copy bbs. */
copy_bbs (bbs, n, e, latch_edge, &new_bbs, loops,
&e, &he, add_irreducible_flag);
copy_bbs (bbs, n, new_bbs, spec_edges, 2, new_spec_edges, loop, loops);
/* Redirect the special edges. */
if (is_latch)
loop->latch = latch->rbi->copy;
/* Record exit edges in this copy. */
if (TEST_BIT (wont_exit, j + 1))
record_exit_edges (orig, new_bbs, n, to_remove, n_to_remove, false);
/* Set counts and frequencies. */
for (i = 0; i < n; i++)
{
new_bb = new_bbs[i];
bb = bbs[i];
if (flags & DLTHE_FLAG_UPDATE_FREQ)
{
new_bb->count = RDIV (scale_act * bb->count, REG_BR_PROB_BASE);
new_bb->frequency = RDIV (scale_act * bb->frequency,
REG_BR_PROB_BASE);
}
else
{
new_bb->count = bb->count;
new_bb->frequency = bb->frequency;
}
for (ae = new_bb->succ; ae; ae = ae->succ_next)
ae->count = RDIV (new_bb->count * ae->probability,
REG_BR_PROB_BASE);
redirect_edge_and_branch_force (latch_edge, new_bbs[0]);
redirect_edge_and_branch_force (new_spec_edges[SE_LATCH],
loop->header);
set_immediate_dominator (loops->cfg.dom, new_bbs[0], latch);
latch = loop->latch = new_bbs[1];
e = latch_edge = new_spec_edges[SE_LATCH];
}
else
{
redirect_edge_and_branch_force (new_spec_edges[SE_LATCH],
loop->header);
redirect_edge_and_branch_force (e, new_bbs[0]);
set_immediate_dominator (loops->cfg.dom, new_bbs[0], e->src);
e = new_spec_edges[SE_LATCH];
}
if (flags & DLTHE_FLAG_UPDATE_FREQ)
scale_act = RDIV (scale_act * scale_step[j], REG_BR_PROB_BASE);
/* Record exit edge in this copy. */
if (orig && TEST_BIT (wont_exit, j + 1))
to_remove[(*n_to_remove)++] = new_spec_edges[SE_ORIG];
/* Note whether the blocks and edges belong to an irreducible loop. */
if (add_irreducible_flag)
{
for (i = 0; i < n; i++)
{
new_bb = new_bbs[i];
if (new_bb->loop_father == target)
new_bb->flags |= BB_IRREDUCIBLE_LOOP;
for (ae = new_bb->succ; ae; ae = ae->succ_next)
if (ae->src->loop_father == target
|| ae->dest->loop_father == target)
ae->flags |= EDGE_IRREDUCIBLE_LOOP;
}
}
/* Record the first copy in the control flow order if it is not
the original loop (i.e. in case of peeling). */
if (!first_active_latch)
{
memcpy (first_active, new_bbs, n * sizeof (basic_block));
first_active_latch = latch->rbi->copy;
first_active_latch = new_bbs[1];
}
free (new_bbs);
/* Original loop header is dominated by latch copy
if we duplicated on its only entry edge. */
if (!is_latch && !header->pred->pred_next->pred_next)
set_immediate_dominator (loops->cfg.dom, header, latch->rbi->copy);
if (is_latch && j == 0)
/* Set counts and frequencies. */
if (flags & DLTHE_FLAG_UPDATE_FREQ)
{
/* Update edge from latch. */
for (latch_edge = header->rbi->copy->pred;
latch_edge->src != latch;
latch_edge = latch_edge->pred_next);
scale_bbs_frequencies (new_bbs, n, scale_act, REG_BR_PROB_BASE);
scale_act = RDIV (scale_act * scale_step[j], REG_BR_PROB_BASE);
}
}
/* Now handle original loop. */
/* Update edge counts. */
free (new_bbs);
free (orig_loops);
/* Update the original loop. */
if (!is_latch)
set_immediate_dominator (loops->cfg.dom, e->dest, e->src);
if (flags & DLTHE_FLAG_UPDATE_FREQ)
{
for (i = 0; i < n; i++)
{
bb = bbs[i];
bb->count = RDIV (scale_main * bb->count, REG_BR_PROB_BASE);
bb->frequency = RDIV (scale_main * bb->frequency, REG_BR_PROB_BASE);
for (ae = bb->succ; ae; ae = ae->succ_next)
ae->count = RDIV (bb->count * ae->probability, REG_BR_PROB_BASE);
}
scale_bbs_frequencies (bbs, n, scale_main, REG_BR_PROB_BASE);
free (scale_step);
}
free (orig_loops);
/* Update dominators of other blocks if affected. */
/* Update dominators of outer blocks if affected. */
for (i = 0; i < n; i++)
{
basic_block dominated, dom_bb, *dom_bbs;