static void
compute_nearerout (struct edge_list *edge_list, sbitmap *farthest,
sbitmap *st_avloc, sbitmap *nearer, sbitmap *nearerout)
{
int num_edges, i;
edge e;
basic_block *worklist, *tos, bb;
edge_iterator ei;
num_edges = NUM_EDGES (edge_list);
/* Allocate a worklist array/queue. Entries are only added to the
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
tos = worklist = XNEWVEC (basic_block, n_basic_blocks_for_fn (cfun) + 1);
/* Initialize NEARER for each edge and build a mapping from an edge to
its index. */
for (i = 0; i < num_edges; i++)
INDEX_EDGE (edge_list, i)->aux = (void *) (size_t) i;
/* We want a maximal solution. */
bitmap_vector_ones (nearer, num_edges);
/* Note that even though we want an optimistic setting of NEARER, we
do not want to be overly optimistic. Consider an incoming edge to
the exit block. That edge should always have a NEARER value the
same as FARTHEST for that edge. */
FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR_FOR_FN (cfun)->preds)
bitmap_copy (nearer[(size_t)e->aux], farthest[(size_t)e->aux]);
/* Add all the blocks to the worklist. This prevents an early exit
from the loop given our optimistic initialization of NEARER. */
FOR_EACH_BB_FN (bb, cfun)
{
*tos++ = bb;
bb->aux = bb;
}
static int
optimize_mode_switching (void)
{
int e;
basic_block bb;
bool need_commit = false;
static const int num_modes[] = NUM_MODES_FOR_MODE_SWITCHING;
#define N_ENTITIES ARRAY_SIZE (num_modes)
int entity_map[N_ENTITIES];
struct bb_info *bb_info[N_ENTITIES];
int i, j;
int n_entities = 0;
int max_num_modes = 0;
bool emitted ATTRIBUTE_UNUSED = false;
basic_block post_entry = 0;
basic_block pre_exit = 0;
struct edge_list *edge_list = 0;
/* These bitmaps are used for the LCM algorithm. */
sbitmap *kill, *del, *insert, *antic, *transp, *comp;
sbitmap *avin, *avout;
for (e = N_ENTITIES - 1; e >= 0; e--)
if (OPTIMIZE_MODE_SWITCHING (e))
{
int entry_exit_extra = 0;
/* Create the list of segments within each basic block.
If NORMAL_MODE is defined, allow for two extra
blocks split from the entry and exit block. */
if (targetm.mode_switching.entry && targetm.mode_switching.exit)
entry_exit_extra = 3;
bb_info[n_entities]
= XCNEWVEC (struct bb_info,
last_basic_block_for_fn (cfun) + entry_exit_extra);
entity_map[n_entities++] = e;
if (num_modes[e] > max_num_modes)
max_num_modes = num_modes[e];
}
if (! n_entities)
return 0;
/* Make sure if MODE_ENTRY is defined MODE_EXIT is defined. */
gcc_assert ((targetm.mode_switching.entry && targetm.mode_switching.exit)
|| (!targetm.mode_switching.entry
&& !targetm.mode_switching.exit));
if (targetm.mode_switching.entry && targetm.mode_switching.exit)
{
/* Split the edge from the entry block, so that we can note that
there NORMAL_MODE is supplied. */
post_entry = split_edge (single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun)));
pre_exit = create_pre_exit (n_entities, entity_map, num_modes);
}
df_analyze ();
/* Create the bitmap vectors. */
antic = sbitmap_vector_alloc (last_basic_block_for_fn (cfun),
n_entities * max_num_modes);
transp = sbitmap_vector_alloc (last_basic_block_for_fn (cfun),
n_entities * max_num_modes);
comp = sbitmap_vector_alloc (last_basic_block_for_fn (cfun),
n_entities * max_num_modes);
avin = sbitmap_vector_alloc (last_basic_block_for_fn (cfun),
n_entities * max_num_modes);
avout = sbitmap_vector_alloc (last_basic_block_for_fn (cfun),
n_entities * max_num_modes);
kill = sbitmap_vector_alloc (last_basic_block_for_fn (cfun),
n_entities * max_num_modes);
bitmap_vector_ones (transp, last_basic_block_for_fn (cfun));
bitmap_vector_clear (antic, last_basic_block_for_fn (cfun));
bitmap_vector_clear (comp, last_basic_block_for_fn (cfun));
for (j = n_entities - 1; j >= 0; j--)
{
int e = entity_map[j];
int no_mode = num_modes[e];
struct bb_info *info = bb_info[j];
rtx_insn *insn;
/* Determine what the first use (if any) need for a mode of entity E is.
This will be the mode that is anticipatable for this block.
Also compute the initial transparency settings. */
FOR_EACH_BB_FN (bb, cfun)
{
struct seginfo *ptr;
int last_mode = no_mode;
bool any_set_required = false;
HARD_REG_SET live_now;
info[bb->index].mode_out = info[bb->index].mode_in = no_mode;
REG_SET_TO_HARD_REG_SET (live_now, df_get_live_in (bb));
/* Pretend the mode is clobbered across abnormal edges. */
{
edge_iterator ei;
edge eg;
FOR_EACH_EDGE (eg, ei, bb->preds)
if (eg->flags & EDGE_COMPLEX)
break;
if (eg)
{
rtx_insn *ins_pos = BB_HEAD (bb);
if (LABEL_P (ins_pos))
ins_pos = NEXT_INSN (ins_pos);
gcc_assert (NOTE_INSN_BASIC_BLOCK_P (ins_pos));
if (ins_pos != BB_END (bb))
ins_pos = NEXT_INSN (ins_pos);
ptr = new_seginfo (no_mode, ins_pos, bb->index, live_now);
add_seginfo (info + bb->index, ptr);
for (i = 0; i < no_mode; i++)
clear_mode_bit (transp[bb->index], j, i);
}
}
FOR_BB_INSNS (bb, insn)
{
if (INSN_P (insn))
{
int mode = targetm.mode_switching.needed (e, insn);
rtx link;
if (mode != no_mode && mode != last_mode)
{
any_set_required = true;
last_mode = mode;
ptr = new_seginfo (mode, insn, bb->index, live_now);
add_seginfo (info + bb->index, ptr);
for (i = 0; i < no_mode; i++)
clear_mode_bit (transp[bb->index], j, i);
}
if (targetm.mode_switching.after)
last_mode = targetm.mode_switching.after (e, last_mode,
insn);
/* Update LIVE_NOW. */
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
if (REG_NOTE_KIND (link) == REG_DEAD)
reg_dies (XEXP (link, 0), &live_now);
note_stores (PATTERN (insn), reg_becomes_live, &live_now);
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
if (REG_NOTE_KIND (link) == REG_UNUSED)
reg_dies (XEXP (link, 0), &live_now);
}
}
info[bb->index].computing = last_mode;
/* Check for blocks without ANY mode requirements.
N.B. because of MODE_AFTER, last_mode might still
be different from no_mode, in which case we need to
mark the block as nontransparent. */
if (!any_set_required)
{
ptr = new_seginfo (no_mode, BB_END (bb), bb->index, live_now);
add_seginfo (info + bb->index, ptr);
if (last_mode != no_mode)
for (i = 0; i < no_mode; i++)
clear_mode_bit (transp[bb->index], j, i);
}
}
if (targetm.mode_switching.entry && targetm.mode_switching.exit)
{
int mode = targetm.mode_switching.entry (e);
info[post_entry->index].mode_out =
info[post_entry->index].mode_in = no_mode;
if (pre_exit)
{
info[pre_exit->index].mode_out =
info[pre_exit->index].mode_in = no_mode;
}
if (mode != no_mode)
{
bb = post_entry;
/* By always making this nontransparent, we save
an extra check in make_preds_opaque. We also
need this to avoid confusing pre_edge_lcm when
antic is cleared but transp and comp are set. */
for (i = 0; i < no_mode; i++)
clear_mode_bit (transp[bb->index], j, i);
/* Insert a fake computing definition of MODE into entry
blocks which compute no mode. This represents the mode on
entry. */
info[bb->index].computing = mode;
if (pre_exit)
info[pre_exit->index].seginfo->mode =
targetm.mode_switching.exit (e);
}
}
/* Set the anticipatable and computing arrays. */
for (i = 0; i < no_mode; i++)
{
int m = targetm.mode_switching.priority (entity_map[j], i);
FOR_EACH_BB_FN (bb, cfun)
{
if (info[bb->index].seginfo->mode == m)
set_mode_bit (antic[bb->index], j, m);
if (info[bb->index].computing == m)
set_mode_bit (comp[bb->index], j, m);
}
}
}
/* Calculate the optimal locations for the
placement mode switches to modes with priority I. */
FOR_EACH_BB_FN (bb, cfun)
bitmap_not (kill[bb->index], transp[bb->index]);
edge_list = pre_edge_lcm_avs (n_entities * max_num_modes, transp, comp, antic,
kill, avin, avout, &insert, &del);
for (j = n_entities - 1; j >= 0; j--)
{
int no_mode = num_modes[entity_map[j]];
/* Insert all mode sets that have been inserted by lcm. */
for (int ed = NUM_EDGES (edge_list) - 1; ed >= 0; ed--)
{
edge eg = INDEX_EDGE (edge_list, ed);
eg->aux = (void *)(intptr_t)-1;
for (i = 0; i < no_mode; i++)
{
int m = targetm.mode_switching.priority (entity_map[j], i);
if (mode_bit_p (insert[ed], j, m))
{
eg->aux = (void *)(intptr_t)m;
break;
}
}
}
FOR_EACH_BB_FN (bb, cfun)
{
struct bb_info *info = bb_info[j];
int last_mode = no_mode;
/* intialize mode in availability for bb. */
for (i = 0; i < no_mode; i++)
if (mode_bit_p (avout[bb->index], j, i))
{
if (last_mode == no_mode)
last_mode = i;
if (last_mode != i)
{
last_mode = no_mode;
break;
}
}
info[bb->index].mode_out = last_mode;
/* intialize mode out availability for bb. */
last_mode = no_mode;
for (i = 0; i < no_mode; i++)
if (mode_bit_p (avin[bb->index], j, i))
{
if (last_mode == no_mode)
last_mode = i;
if (last_mode != i)
{
last_mode = no_mode;
break;
}
}
info[bb->index].mode_in = last_mode;
for (i = 0; i < no_mode; i++)
if (mode_bit_p (del[bb->index], j, i))
info[bb->index].seginfo->mode = no_mode;
}
/* Now output the remaining mode sets in all the segments. */
/* In case there was no mode inserted. the mode information on the edge
might not be complete.
Update mode info on edges and commit pending mode sets. */
need_commit |= commit_mode_sets (edge_list, entity_map[j], bb_info[j]);
/* Reset modes for next entity. */
clear_aux_for_edges ();
FOR_EACH_BB_FN (bb, cfun)
{
struct seginfo *ptr, *next;
int cur_mode = bb_info[j][bb->index].mode_in;
for (ptr = bb_info[j][bb->index].seginfo; ptr; ptr = next)
{
next = ptr->next;
if (ptr->mode != no_mode)
{
rtx_insn *mode_set;
rtl_profile_for_bb (bb);
start_sequence ();
targetm.mode_switching.emit (entity_map[j], ptr->mode,
cur_mode, ptr->regs_live);
mode_set = get_insns ();
end_sequence ();
/* modes kill each other inside a basic block. */
cur_mode = ptr->mode;
/* Insert MODE_SET only if it is nonempty. */
if (mode_set != NULL_RTX)
{
emitted = true;
if (NOTE_INSN_BASIC_BLOCK_P (ptr->insn_ptr))
/* We need to emit the insns in a FIFO-like manner,
i.e. the first to be emitted at our insertion
point ends up first in the instruction steam.
Because we made sure that NOTE_INSN_BASIC_BLOCK is
only used for initially empty basic blocks, we
can achieve this by appending at the end of
the block. */
emit_insn_after
(mode_set, BB_END (NOTE_BASIC_BLOCK (ptr->insn_ptr)));
else
emit_insn_before (mode_set, ptr->insn_ptr);
}
default_rtl_profile ();
}
free (ptr);
}
}
free (bb_info[j]);
}
free_edge_list (edge_list);
/* Finished. Free up all the things we've allocated. */
sbitmap_vector_free (del);
sbitmap_vector_free (insert);
sbitmap_vector_free (kill);
sbitmap_vector_free (antic);
sbitmap_vector_free (transp);
sbitmap_vector_free (comp);
sbitmap_vector_free (avin);
sbitmap_vector_free (avout);
if (need_commit)
commit_edge_insertions ();
if (targetm.mode_switching.entry && targetm.mode_switching.exit)
cleanup_cfg (CLEANUP_NO_INSN_DEL);
else if (!need_commit && !emitted)
return 0;
return 1;
}
static void
compute_antinout_edge (sbitmap *antloc, sbitmap *transp, sbitmap *antin,
sbitmap *antout)
{
basic_block bb;
edge e;
basic_block *worklist, *qin, *qout, *qend;
unsigned int qlen;
edge_iterator ei;
/* Allocate a worklist array/queue. Entries are only added to the
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
qin = qout = worklist = XNEWVEC (basic_block, n_basic_blocks_for_fn (cfun));
/* We want a maximal solution, so make an optimistic initialization of
ANTIN. */
bitmap_vector_ones (antin, last_basic_block_for_fn (cfun));
/* Put every block on the worklist; this is necessary because of the
optimistic initialization of ANTIN above. */
int *postorder = XNEWVEC (int, n_basic_blocks_for_fn (cfun));
int postorder_num = post_order_compute (postorder, false, false);
for (int i = 0; i < postorder_num; ++i)
{
bb = BASIC_BLOCK_FOR_FN (cfun, postorder[i]);
*qin++ = bb;
bb->aux = bb;
}
free (postorder);
qin = worklist;
qend = &worklist[n_basic_blocks_for_fn (cfun) - NUM_FIXED_BLOCKS];
qlen = n_basic_blocks_for_fn (cfun) - NUM_FIXED_BLOCKS;
/* Mark blocks which are predecessors of the exit block so that we
can easily identify them below. */
FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR_FOR_FN (cfun)->preds)
e->src->aux = EXIT_BLOCK_PTR_FOR_FN (cfun);
/* Iterate until the worklist is empty. */
while (qlen)
{
/* Take the first entry off the worklist. */
bb = *qout++;
qlen--;
if (qout >= qend)
qout = worklist;
if (bb->aux == EXIT_BLOCK_PTR_FOR_FN (cfun))
/* Do not clear the aux field for blocks which are predecessors of
the EXIT block. That way we never add then to the worklist
again. */
bitmap_clear (antout[bb->index]);
else
{
/* Clear the aux field of this block so that it can be added to
the worklist again if necessary. */
bb->aux = NULL;
bitmap_intersection_of_succs (antout[bb->index], antin, bb);
}
if (bitmap_or_and (antin[bb->index], antloc[bb->index],
transp[bb->index], antout[bb->index]))
/* If the in state of this block changed, then we need
to add the predecessors of this block to the worklist
if they are not already on the worklist. */
FOR_EACH_EDGE (e, ei, bb->preds)
if (!e->src->aux && e->src != ENTRY_BLOCK_PTR_FOR_FN (cfun))
{
*qin++ = e->src;
e->src->aux = e;
qlen++;
if (qin >= qend)
qin = worklist;
}
}
clear_aux_for_edges ();
clear_aux_for_blocks ();
free (worklist);
}
void
compute_available (sbitmap *avloc, sbitmap *kill, sbitmap *avout,
sbitmap *avin)
{
edge e;
basic_block *worklist, *qin, *qout, *qend, bb;
unsigned int qlen;
edge_iterator ei;
/* Allocate a worklist array/queue. Entries are only added to the
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
qin = qout = worklist =
XNEWVEC (basic_block, n_basic_blocks_for_fn (cfun) - NUM_FIXED_BLOCKS);
/* We want a maximal solution. */
bitmap_vector_ones (avout, last_basic_block_for_fn (cfun));
/* Put every block on the worklist; this is necessary because of the
optimistic initialization of AVOUT above. Use inverted postorder
to make the dataflow problem require less iterations. */
int *postorder = XNEWVEC (int, n_basic_blocks_for_fn (cfun));
int postorder_num = inverted_post_order_compute (postorder);
for (int i = 0; i < postorder_num; ++i)
{
bb = BASIC_BLOCK_FOR_FN (cfun, postorder[i]);
if (bb == EXIT_BLOCK_PTR_FOR_FN (cfun)
|| bb == ENTRY_BLOCK_PTR_FOR_FN (cfun))
continue;
*qin++ = bb;
bb->aux = bb;
}
free (postorder);
qin = worklist;
qend = &worklist[n_basic_blocks_for_fn (cfun) - NUM_FIXED_BLOCKS];
qlen = n_basic_blocks_for_fn (cfun) - NUM_FIXED_BLOCKS;
/* Mark blocks which are successors of the entry block so that we
can easily identify them below. */
FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR_FOR_FN (cfun)->succs)
e->dest->aux = ENTRY_BLOCK_PTR_FOR_FN (cfun);
/* Iterate until the worklist is empty. */
while (qlen)
{
/* Take the first entry off the worklist. */
bb = *qout++;
qlen--;
if (qout >= qend)
qout = worklist;
/* If one of the predecessor blocks is the ENTRY block, then the
intersection of avouts is the null set. We can identify such blocks
by the special value in the AUX field in the block structure. */
if (bb->aux == ENTRY_BLOCK_PTR_FOR_FN (cfun))
/* Do not clear the aux field for blocks which are successors of the
ENTRY block. That way we never add then to the worklist again. */
bitmap_clear (avin[bb->index]);
else
{
/* Clear the aux field of this block so that it can be added to
the worklist again if necessary. */
bb->aux = NULL;
bitmap_intersection_of_preds (avin[bb->index], avout, bb);
}
if (bitmap_ior_and_compl (avout[bb->index], avloc[bb->index],
avin[bb->index], kill[bb->index]))
/* If the out state of this block changed, then we need
to add the successors of this block to the worklist
if they are not already on the worklist. */
FOR_EACH_EDGE (e, ei, bb->succs)
if (!e->dest->aux && e->dest != EXIT_BLOCK_PTR_FOR_FN (cfun))
{
*qin++ = e->dest;
e->dest->aux = e;
qlen++;
if (qin >= qend)
qin = worklist;
}
}
clear_aux_for_edges ();
clear_aux_for_blocks ();
free (worklist);
}
static void
compute_laterin (struct edge_list *edge_list, sbitmap *earliest,
sbitmap *antloc, sbitmap *later, sbitmap *laterin)
{
int num_edges, i;
edge e;
basic_block *worklist, *qin, *qout, *qend, bb;
unsigned int qlen;
edge_iterator ei;
num_edges = NUM_EDGES (edge_list);
/* Allocate a worklist array/queue. Entries are only added to the
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
qin = qout = worklist
= XNEWVEC (basic_block, n_basic_blocks_for_fn (cfun));
/* Initialize a mapping from each edge to its index. */
for (i = 0; i < num_edges; i++)
INDEX_EDGE (edge_list, i)->aux = (void *) (size_t) i;
/* We want a maximal solution, so initially consider LATER true for
all edges. This allows propagation through a loop since the incoming
loop edge will have LATER set, so if all the other incoming edges
to the loop are set, then LATERIN will be set for the head of the
loop.
If the optimistic setting of LATER on that edge was incorrect (for
example the expression is ANTLOC in a block within the loop) then
this algorithm will detect it when we process the block at the head
of the optimistic edge. That will requeue the affected blocks. */
bitmap_vector_ones (later, num_edges);
/* Note that even though we want an optimistic setting of LATER, we
do not want to be overly optimistic. Consider an outgoing edge from
the entry block. That edge should always have a LATER value the
same as EARLIEST for that edge. */
FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR_FOR_FN (cfun)->succs)
bitmap_copy (later[(size_t) e->aux], earliest[(size_t) e->aux]);
/* Add all the blocks to the worklist. This prevents an early exit from
the loop given our optimistic initialization of LATER above. */
int *postorder = XNEWVEC (int, n_basic_blocks_for_fn (cfun));
int postorder_num = inverted_post_order_compute (postorder);
for (int i = 0; i < postorder_num; ++i)
{
bb = BASIC_BLOCK_FOR_FN (cfun, postorder[i]);
if (bb == EXIT_BLOCK_PTR_FOR_FN (cfun)
|| bb == ENTRY_BLOCK_PTR_FOR_FN (cfun))
continue;
*qin++ = bb;
bb->aux = bb;
}
free (postorder);
/* Note that we do not use the last allocated element for our queue,
as EXIT_BLOCK is never inserted into it. */
qin = worklist;
qend = &worklist[n_basic_blocks_for_fn (cfun) - NUM_FIXED_BLOCKS];
qlen = n_basic_blocks_for_fn (cfun) - NUM_FIXED_BLOCKS;
/* Iterate until the worklist is empty. */
while (qlen)
{
/* Take the first entry off the worklist. */
bb = *qout++;
bb->aux = NULL;
qlen--;
if (qout >= qend)
qout = worklist;
/* Compute the intersection of LATERIN for each incoming edge to B. */
bitmap_ones (laterin[bb->index]);
FOR_EACH_EDGE (e, ei, bb->preds)
bitmap_and (laterin[bb->index], laterin[bb->index],
later[(size_t)e->aux]);
/* Calculate LATER for all outgoing edges. */
FOR_EACH_EDGE (e, ei, bb->succs)
if (bitmap_ior_and_compl (later[(size_t) e->aux],
earliest[(size_t) e->aux],
laterin[bb->index],
antloc[bb->index])
/* If LATER for an outgoing edge was changed, then we need
to add the target of the outgoing edge to the worklist. */
&& e->dest != EXIT_BLOCK_PTR_FOR_FN (cfun) && e->dest->aux == 0)
{
*qin++ = e->dest;
e->dest->aux = e;
qlen++;
if (qin >= qend)
qin = worklist;
}
}
/* Computation of insertion and deletion points requires computing LATERIN
for the EXIT block. We allocated an extra entry in the LATERIN array
for just this purpose. */
bitmap_ones (laterin[last_basic_block_for_fn (cfun)]);
FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR_FOR_FN (cfun)->preds)
bitmap_and (laterin[last_basic_block_for_fn (cfun)],
laterin[last_basic_block_for_fn (cfun)],
later[(size_t) e->aux]);
clear_aux_for_edges ();
free (worklist);
}
static void
compute_nearerout (struct edge_list *edge_list, sbitmap *farthest,
sbitmap *st_avloc, sbitmap *nearer, sbitmap *nearerout)
{
int num_edges, i;
edge e;
basic_block *worklist, *tos, bb;
edge_iterator ei;
num_edges = NUM_EDGES (edge_list);
/* Allocate a worklist array/queue. Entries are only added to the
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
tos = worklist = XNEWVEC (basic_block, n_basic_blocks + 1);
/* Initialize NEARER for each edge and build a mapping from an edge to
its index. */
for (i = 0; i < num_edges; i++)
INDEX_EDGE (edge_list, i)->aux = (void *) (size_t) i;
/* We want a maximal solution. */
bitmap_vector_ones (nearer, num_edges);
/* Note that even though we want an optimistic setting of NEARER, we
do not want to be overly optimistic. Consider an incoming edge to
the exit block. That edge should always have a NEARER value the
same as FARTHEST for that edge. */
FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
bitmap_copy (nearer[(size_t)e->aux], farthest[(size_t)e->aux]);
/* Add all the blocks to the worklist. This prevents an early exit
from the loop given our optimistic initialization of NEARER. */
FOR_EACH_BB (bb)
{
*tos++ = bb;
bb->aux = bb;
}
/* Iterate until the worklist is empty. */
while (tos != worklist)
{
/* Take the first entry off the worklist. */
bb = *--tos;
bb->aux = NULL;
/* Compute the intersection of NEARER for each outgoing edge from B. */
bitmap_ones (nearerout[bb->index]);
FOR_EACH_EDGE (e, ei, bb->succs)
bitmap_and (nearerout[bb->index], nearerout[bb->index],
nearer[(size_t) e->aux]);
/* Calculate NEARER for all incoming edges. */
FOR_EACH_EDGE (e, ei, bb->preds)
if (bitmap_ior_and_compl (nearer[(size_t) e->aux],
farthest[(size_t) e->aux],
nearerout[e->dest->index],
st_avloc[e->dest->index])
/* If NEARER for an incoming edge was changed, then we need
to add the source of the incoming edge to the worklist. */
&& e->src != ENTRY_BLOCK_PTR && e->src->aux == 0)
{
*tos++ = e->src;
e->src->aux = e;
}
}
/* Computation of insertion and deletion points requires computing NEAREROUT
for the ENTRY block. We allocated an extra entry in the NEAREROUT array
for just this purpose. */
bitmap_ones (nearerout[last_basic_block]);
FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
bitmap_and (nearerout[last_basic_block],
nearerout[last_basic_block],
nearer[(size_t) e->aux]);
clear_aux_for_edges ();
free (tos);
}
