-/* Generic partial redundancy elimination with lazy code motion
- support.
- Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
+/* Generic partial redundancy elimination with lazy code motion support.
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
+ Free Software Foundation, Inc.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC 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 version.
+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
+version.
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+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. */
/* These routines are meant to be used by various optimization
- passes which can be modeled as lazy code motion problems.
+ passes which can be modeled as lazy code motion problems.
Including, but not limited to:
* Traditional partial redundancy elimination.
#include "config.h"
#include "system.h"
-
+#include "coretypes.h"
+#include "tm.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "insn-config.h"
#include "recog.h"
#include "basic-block.h"
+#include "output.h"
#include "tm_p.h"
+#include "function.h"
+
/* We want target macros for the mode switching code to be able to refer
to instruction attribute values. */
#include "insn-attr.h"
/* Edge based LCM routines. */
-static void compute_antinout_edge PARAMS ((sbitmap *, sbitmap *,
- sbitmap *, sbitmap *));
-static void compute_earliest PARAMS ((struct edge_list *, int, sbitmap *,
- sbitmap *, sbitmap *, sbitmap *,
- sbitmap *));
-static void compute_laterin PARAMS ((struct edge_list *, sbitmap *,
- sbitmap *, sbitmap *, sbitmap *));
-static void compute_insert_delete PARAMS ((struct edge_list *edge_list,
- sbitmap *, sbitmap *, sbitmap *,
- sbitmap *, sbitmap *));
+static void compute_antinout_edge (sbitmap *, sbitmap *, sbitmap *, sbitmap *);
+static void compute_earliest (struct edge_list *, int, sbitmap *, sbitmap *,
+ sbitmap *, sbitmap *, sbitmap *);
+static void compute_laterin (struct edge_list *, sbitmap *, sbitmap *,
+ sbitmap *, sbitmap *);
+static void compute_insert_delete (struct edge_list *edge_list, sbitmap *,
+ sbitmap *, sbitmap *, sbitmap *, sbitmap *);
/* Edge based LCM routines on a reverse flowgraph. */
-static void compute_farthest PARAMS ((struct edge_list *, int, sbitmap *,
- sbitmap *, sbitmap*, sbitmap *,
- sbitmap *));
-static void compute_nearerout PARAMS ((struct edge_list *, sbitmap *,
- sbitmap *, sbitmap *, sbitmap *));
-static void compute_rev_insert_delete PARAMS ((struct edge_list *edge_list,
- sbitmap *, sbitmap *, sbitmap *,
- sbitmap *, sbitmap *));
-
+static void compute_farthest (struct edge_list *, int, sbitmap *, sbitmap *,
+ sbitmap*, sbitmap *, sbitmap *);
+static void compute_nearerout (struct edge_list *, sbitmap *, sbitmap *,
+ sbitmap *, sbitmap *);
+static void compute_rev_insert_delete (struct edge_list *edge_list, sbitmap *,
+ sbitmap *, sbitmap *, sbitmap *,
+ sbitmap *);
\f
/* Edge based lcm routines. */
-/* Compute expression anticipatability at entrance and exit of each block.
- This is done based on the flow graph, and not on the pred-succ lists.
+/* Compute expression anticipatability at entrance and exit of each block.
+ This is done based on the flow graph, and not on the pred-succ lists.
Other than that, its pretty much identical to compute_antinout. */
static void
-compute_antinout_edge (antloc, transp, antin, antout)
- sbitmap *antloc;
- sbitmap *transp;
- sbitmap *antin;
- sbitmap *antout;
+compute_antinout_edge (sbitmap *antloc, sbitmap *transp, sbitmap *antin,
+ sbitmap *antout)
{
- int bb;
+ basic_block bb;
edge e;
- basic_block *worklist, *tos;
+ 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. */
- tos = worklist = (basic_block *) xmalloc (sizeof (basic_block)
- * n_basic_blocks);
+ qin = qout = worklist = xmalloc (sizeof (basic_block) * n_basic_blocks);
/* We want a maximal solution, so make an optimistic initialization of
ANTIN. */
- sbitmap_vector_ones (antin, n_basic_blocks);
+ sbitmap_vector_ones (antin, last_basic_block);
/* Put every block on the worklist; this is necessary because of the
optimistic initialization of ANTIN above. */
- for (bb = 0; bb < n_basic_blocks; bb++)
+ FOR_EACH_BB_REVERSE (bb)
{
- *tos++ = BASIC_BLOCK (bb);
- BASIC_BLOCK (bb)->aux = BASIC_BLOCK (bb);
+ *qin++ = bb;
+ bb->aux = bb;
}
+ qin = worklist;
+ qend = &worklist[n_basic_blocks];
+ qlen = n_basic_blocks;
+
/* Mark blocks which are predecessors of the exit block so that we
can easily identify them below. */
- for (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
e->src->aux = EXIT_BLOCK_PTR;
/* Iterate until the worklist is empty. */
- while (tos != worklist)
+ while (qlen)
{
/* Take the first entry off the worklist. */
- basic_block b = *--tos;
- bb = b->index;
+ bb = *qout++;
+ qlen--;
- if (b->aux == EXIT_BLOCK_PTR)
- {
- /* 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. */
- sbitmap_zero (antout[bb]);
- }
+ if (qout >= qend)
+ qout = worklist;
+
+ if (bb->aux == EXIT_BLOCK_PTR)
+ /* 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. */
+ sbitmap_zero (antout[bb->index]);
else
{
/* Clear the aux field of this block so that it can be added to
the worklist again if necessary. */
- b->aux = NULL;
- sbitmap_intersection_of_succs (antout[bb], antin, bb);
+ bb->aux = NULL;
+ sbitmap_intersection_of_succs (antout[bb->index], antin, bb->index);
}
- if (sbitmap_a_or_b_and_c (antin[bb], antloc[bb], transp[bb], antout[bb]))
- {
- /* 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 (e = b->pred; e; e = e->pred_next)
+ if (sbitmap_a_or_b_and_c_cg (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)
{
- if (!e->src->aux && e->src != ENTRY_BLOCK_PTR)
- {
- *tos++ = e->src;
- e->src->aux = e;
- }
+ *qin++ = e->src;
+ e->src->aux = e;
+ qlen++;
+ if (qin >= qend)
+ qin = worklist;
}
- }
}
- free (tos);
+
+ clear_aux_for_edges ();
+ clear_aux_for_blocks ();
+ free (worklist);
}
/* Compute the earliest vector for edge based lcm. */
+
static void
-compute_earliest (edge_list, n_exprs, antin, antout, avout, kill, earliest)
- struct edge_list *edge_list;
- int n_exprs;
- sbitmap *antin, *antout, *avout, *kill, *earliest;
+compute_earliest (struct edge_list *edge_list, int n_exprs, sbitmap *antin,
+ sbitmap *antout, sbitmap *avout, sbitmap *kill,
+ sbitmap *earliest)
{
sbitmap difference, temp_bitmap;
- int x, num_edges;
+ int x, num_edges;
basic_block pred, succ;
num_edges = NUM_EDGES (edge_list);
if (pred == ENTRY_BLOCK_PTR)
sbitmap_copy (earliest[x], antin[succ->index]);
else
- {
+ {
if (succ == EXIT_BLOCK_PTR)
- {
- sbitmap_zero (earliest[x]);
- }
+ sbitmap_zero (earliest[x]);
else
{
- sbitmap_difference (difference, antin[succ->index],
- avout[pred->index]);
+ sbitmap_difference (difference, antin[succ->index],
+ avout[pred->index]);
sbitmap_not (temp_bitmap, antout[pred->index]);
- sbitmap_a_and_b_or_c (earliest[x], difference, kill[pred->index],
- temp_bitmap);
+ sbitmap_a_and_b_or_c (earliest[x], difference,
+ kill[pred->index], temp_bitmap);
}
}
}
- free (temp_bitmap);
- free (difference);
+
+ sbitmap_free (temp_bitmap);
+ sbitmap_free (difference);
}
/* later(p,s) is dependent on the calculation of laterin(p).
EXIT block are handled in the normal fashion inside the loop. However,
the insertion/deletion computation needs LATERIN(EXIT), so we have
to compute it. */
-
+
static void
-compute_laterin (edge_list, earliest, antloc, later, laterin)
- struct edge_list *edge_list;
- sbitmap *earliest, *antloc, *later, *laterin;
+compute_laterin (struct edge_list *edge_list, sbitmap *earliest,
+ sbitmap *antloc, sbitmap *later, sbitmap *laterin)
{
- int bb, num_edges, i;
+ int num_edges, i;
edge e;
- basic_block *worklist, *tos;
+ 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. */
- tos = worklist = (basic_block *) xmalloc (sizeof (basic_block)
- * (n_basic_blocks + 1));
+ qin = qout = worklist
+ = xmalloc (sizeof (basic_block) * (n_basic_blocks + 1));
/* Initialize a mapping from each edge to its index. */
for (i = 0; i < num_edges; i++)
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 (e = ENTRY_BLOCK_PTR->succ; e; e = e->succ_next)
- sbitmap_copy (later[(size_t)e->aux], earliest[(size_t)e->aux]);
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
+ sbitmap_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. */
- for (bb = n_basic_blocks - 1; bb >= 0; bb--)
+ FOR_EACH_BB (bb)
{
- basic_block b = BASIC_BLOCK (bb);
- *tos++ = b;
- b->aux = b;
+ *qin++ = bb;
+ bb->aux = bb;
}
+ /* Note that we do not use the last allocated element for our queue,
+ as EXIT_BLOCK is never inserted into it. In fact the above allocation
+ of n_basic_blocks + 1 elements is not necessary. */
+ qin = worklist;
+ qend = &worklist[n_basic_blocks];
+ qlen = n_basic_blocks;
+
/* Iterate until the worklist is empty. */
- while (tos != worklist)
+ while (qlen)
{
/* Take the first entry off the worklist. */
- basic_block b = *--tos;
- b->aux = NULL;
+ bb = *qout++;
+ bb->aux = NULL;
+ qlen--;
+ if (qout >= qend)
+ qout = worklist;
/* Compute the intersection of LATERIN for each incoming edge to B. */
- bb = b->index;
- sbitmap_ones (laterin[bb]);
- for (e = b->pred; e != NULL; e = e->pred_next)
- sbitmap_a_and_b (laterin[bb], laterin[bb], later[(size_t)e->aux]);
+ sbitmap_ones (laterin[bb->index]);
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ sbitmap_a_and_b (laterin[bb->index], laterin[bb->index],
+ later[(size_t)e->aux]);
/* Calculate LATER for all outgoing edges. */
- for (e = b->succ; e != NULL; e = e->succ_next)
- {
- if (sbitmap_union_of_diff (later[(size_t) e->aux],
- earliest[(size_t) e->aux],
- laterin[e->src->index],
- antloc[e->src->index]))
- {
- /* If LATER for an outgoing edge was changed, then we need
- to add the target of the outgoing edge to the worklist. */
- if (e->dest != EXIT_BLOCK_PTR && e->dest->aux == 0)
- {
- *tos++ = e->dest;
- e->dest->aux = e;
- }
- }
- }
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ if (sbitmap_union_of_diff_cg (later[(size_t) e->aux],
+ earliest[(size_t) e->aux],
+ laterin[e->src->index],
+ antloc[e->src->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 && 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. */
- sbitmap_ones (laterin[n_basic_blocks]);
- for (e = EXIT_BLOCK_PTR->pred; e != NULL; e = e->pred_next)
- sbitmap_a_and_b (laterin[n_basic_blocks],
- laterin[n_basic_blocks],
+ sbitmap_ones (laterin[last_basic_block]);
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
+ sbitmap_a_and_b (laterin[last_basic_block],
+ laterin[last_basic_block],
later[(size_t) e->aux]);
- free (tos);
+ clear_aux_for_edges ();
+ free (worklist);
}
/* Compute the insertion and deletion points for edge based LCM. */
+
static void
-compute_insert_delete (edge_list, antloc, later, laterin,
- insert, delete)
- struct edge_list *edge_list;
- sbitmap *antloc, *later, *laterin, *insert, *delete;
+compute_insert_delete (struct edge_list *edge_list, sbitmap *antloc,
+ sbitmap *later, sbitmap *laterin, sbitmap *insert,
+ sbitmap *delete)
{
int x;
+ basic_block bb;
+
+ FOR_EACH_BB (bb)
+ sbitmap_difference (delete[bb->index], antloc[bb->index],
+ laterin[bb->index]);
- for (x = 0; x < n_basic_blocks; x++)
- sbitmap_difference (delete[x], antloc[x], laterin[x]);
-
for (x = 0; x < NUM_EDGES (edge_list); x++)
{
basic_block b = INDEX_EDGE_SUCC_BB (edge_list, x);
+
if (b == EXIT_BLOCK_PTR)
- sbitmap_difference (insert[x], later[x], laterin[n_basic_blocks]);
+ sbitmap_difference (insert[x], later[x], laterin[last_basic_block]);
else
sbitmap_difference (insert[x], later[x], laterin[b->index]);
}
}
-/* Given local properties TRANSP, ANTLOC, AVOUT, KILL return the
- insert and delete vectors for edge based LCM. Returns an
- edgelist which is used to map the insert vector to what edge
- an expression should be inserted on. */
+/* Given local properties TRANSP, ANTLOC, AVOUT, KILL return the insert and
+ delete vectors for edge based LCM. Returns an edgelist which is used to
+ map the insert vector to what edge an expression should be inserted on. */
struct edge_list *
-pre_edge_lcm (file, n_exprs, transp, avloc, antloc, kill, insert, delete)
- FILE *file ATTRIBUTE_UNUSED;
- int n_exprs;
- sbitmap *transp;
- sbitmap *avloc;
- sbitmap *antloc;
- sbitmap *kill;
- sbitmap **insert;
- sbitmap **delete;
+pre_edge_lcm (FILE *file ATTRIBUTE_UNUSED, int n_exprs, sbitmap *transp,
+ sbitmap *avloc, sbitmap *antloc, sbitmap *kill,
+ sbitmap **insert, sbitmap **delete)
{
sbitmap *antin, *antout, *earliest;
sbitmap *avin, *avout;
fprintf (file, "Edge List:\n");
verify_edge_list (file, edge_list);
print_edge_list (file, edge_list);
- dump_sbitmap_vector (file, "transp", "", transp, n_basic_blocks);
- dump_sbitmap_vector (file, "antloc", "", antloc, n_basic_blocks);
- dump_sbitmap_vector (file, "avloc", "", avloc, n_basic_blocks);
- dump_sbitmap_vector (file, "kill", "", kill, n_basic_blocks);
+ dump_sbitmap_vector (file, "transp", "", transp, last_basic_block);
+ dump_sbitmap_vector (file, "antloc", "", antloc, last_basic_block);
+ dump_sbitmap_vector (file, "avloc", "", avloc, last_basic_block);
+ dump_sbitmap_vector (file, "kill", "", kill, last_basic_block);
}
#endif
/* Compute global availability. */
- avin = sbitmap_vector_alloc (n_basic_blocks, n_exprs);
- avout = sbitmap_vector_alloc (n_basic_blocks, n_exprs);
+ avin = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ avout = sbitmap_vector_alloc (last_basic_block, n_exprs);
compute_available (avloc, kill, avout, avin);
-
-
- free (avin);
+ sbitmap_vector_free (avin);
/* Compute global anticipatability. */
- antin = sbitmap_vector_alloc (n_basic_blocks, n_exprs);
- antout = sbitmap_vector_alloc (n_basic_blocks, n_exprs);
+ antin = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ antout = sbitmap_vector_alloc (last_basic_block, n_exprs);
compute_antinout_edge (antloc, transp, antin, antout);
#ifdef LCM_DEBUG_INFO
if (file)
{
- dump_sbitmap_vector (file, "antin", "", antin, n_basic_blocks);
- dump_sbitmap_vector (file, "antout", "", antout, n_basic_blocks);
+ dump_sbitmap_vector (file, "antin", "", antin, last_basic_block);
+ dump_sbitmap_vector (file, "antout", "", antout, last_basic_block);
}
#endif
dump_sbitmap_vector (file, "earliest", "", earliest, num_edges);
#endif
- free (antout);
- free (antin);
- free (avout);
+ sbitmap_vector_free (antout);
+ sbitmap_vector_free (antin);
+ sbitmap_vector_free (avout);
later = sbitmap_vector_alloc (num_edges, n_exprs);
+
/* Allocate an extra element for the exit block in the laterin vector. */
- laterin = sbitmap_vector_alloc (n_basic_blocks + 1, n_exprs);
+ laterin = sbitmap_vector_alloc (last_basic_block + 1, n_exprs);
compute_laterin (edge_list, earliest, antloc, later, laterin);
-
#ifdef LCM_DEBUG_INFO
if (file)
{
- dump_sbitmap_vector (file, "laterin", "", laterin, n_basic_blocks + 1);
+ dump_sbitmap_vector (file, "laterin", "", laterin, last_basic_block + 1);
dump_sbitmap_vector (file, "later", "", later, num_edges);
}
#endif
- free (earliest);
+ sbitmap_vector_free (earliest);
*insert = sbitmap_vector_alloc (num_edges, n_exprs);
- *delete = sbitmap_vector_alloc (n_basic_blocks, n_exprs);
+ *delete = sbitmap_vector_alloc (last_basic_block, n_exprs);
compute_insert_delete (edge_list, antloc, later, laterin, *insert, *delete);
- free (laterin);
- free (later);
+ sbitmap_vector_free (laterin);
+ sbitmap_vector_free (later);
#ifdef LCM_DEBUG_INFO
if (file)
{
dump_sbitmap_vector (file, "pre_insert_map", "", *insert, num_edges);
- dump_sbitmap_vector (file, "pre_delete_map", "", *delete, n_basic_blocks);
+ dump_sbitmap_vector (file, "pre_delete_map", "", *delete,
+ last_basic_block);
}
#endif
/* Compute the AVIN and AVOUT vectors from the AVLOC and KILL vectors.
Return the number of passes we performed to iterate to a solution. */
+
void
-compute_available (avloc, kill, avout, avin)
- sbitmap *avloc, *kill, *avout, *avin;
+compute_available (sbitmap *avloc, sbitmap *kill, sbitmap *avout,
+ sbitmap *avin)
{
- int bb;
edge e;
- basic_block *worklist, *tos;
+ 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. */
- tos = worklist = (basic_block *) xmalloc (sizeof (basic_block)
- * n_basic_blocks);
+ qin = qout = worklist = xmalloc (sizeof (basic_block) * n_basic_blocks);
/* We want a maximal solution. */
- sbitmap_vector_ones (avout, n_basic_blocks);
+ sbitmap_vector_ones (avout, last_basic_block);
/* Put every block on the worklist; this is necessary because of the
optimistic initialization of AVOUT above. */
- for (bb = n_basic_blocks - 1; bb >= 0; bb--)
+ FOR_EACH_BB (bb)
{
- *tos++ = BASIC_BLOCK (bb);
- BASIC_BLOCK (bb)->aux = BASIC_BLOCK (bb);
+ *qin++ = bb;
+ bb->aux = bb;
}
+ qin = worklist;
+ qend = &worklist[n_basic_blocks];
+ qlen = n_basic_blocks;
+
/* Mark blocks which are successors of the entry block so that we
can easily identify them below. */
- for (e = ENTRY_BLOCK_PTR->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
e->dest->aux = ENTRY_BLOCK_PTR;
/* Iterate until the worklist is empty. */
- while (tos != worklist)
+ while (qlen)
{
/* Take the first entry off the worklist. */
- basic_block b = *--tos;
- bb = b->index;
+ 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 (b->aux == ENTRY_BLOCK_PTR)
- {
- /* 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. */
- sbitmap_zero (avin[bb]);
- }
+ if (bb->aux == ENTRY_BLOCK_PTR)
+ /* 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. */
+ sbitmap_zero (avin[bb->index]);
else
{
/* Clear the aux field of this block so that it can be added to
the worklist again if necessary. */
- b->aux = NULL;
- sbitmap_intersection_of_preds (avin[bb], avout, bb);
+ bb->aux = NULL;
+ sbitmap_intersection_of_preds (avin[bb->index], avout, bb->index);
}
- if (sbitmap_union_of_diff (avout[bb], avloc[bb], avin[bb], kill[bb]))
- {
- /* 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 (e = b->succ; e; e = e->succ_next)
+ if (sbitmap_union_of_diff_cg (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)
{
- if (!e->dest->aux && e->dest != EXIT_BLOCK_PTR)
- {
- *tos++ = e->dest;
- e->dest->aux = e;
- }
+ *qin++ = e->dest;
+ e->dest->aux = e;
+ qlen++;
+
+ if (qin >= qend)
+ qin = worklist;
}
- }
}
- free (tos);
+
+ clear_aux_for_edges ();
+ clear_aux_for_blocks ();
+ free (worklist);
}
/* Compute the farthest vector for edge based lcm. */
+
static void
-compute_farthest (edge_list, n_exprs, st_avout, st_avin, st_antin,
- kill, farthest)
- struct edge_list *edge_list;
- int n_exprs;
- sbitmap *st_avout, *st_avin, *st_antin, *kill, *farthest;
+compute_farthest (struct edge_list *edge_list, int n_exprs,
+ sbitmap *st_avout, sbitmap *st_avin, sbitmap *st_antin,
+ sbitmap *kill, sbitmap *farthest)
{
sbitmap difference, temp_bitmap;
- int x, num_edges;
+ int x, num_edges;
basic_block pred, succ;
num_edges = NUM_EDGES (edge_list);
else
{
if (pred == ENTRY_BLOCK_PTR)
- {
- sbitmap_zero (farthest[x]);
- }
+ sbitmap_zero (farthest[x]);
else
{
- sbitmap_difference (difference, st_avout[pred->index],
+ sbitmap_difference (difference, st_avout[pred->index],
st_antin[succ->index]);
sbitmap_not (temp_bitmap, st_avin[succ->index]);
- sbitmap_a_and_b_or_c (farthest[x], difference,
+ sbitmap_a_and_b_or_c (farthest[x], difference,
kill[succ->index], temp_bitmap);
}
}
}
- free (temp_bitmap);
- free (difference);
+
+ sbitmap_free (temp_bitmap);
+ sbitmap_free (difference);
}
/* Compute nearer and nearerout vectors for edge based lcm.
implementation can be found before compute_laterin. */
static void
-compute_nearerout (edge_list, farthest, st_avloc, nearer, nearerout)
- struct edge_list *edge_list;
- sbitmap *farthest, *st_avloc, *nearer, *nearerout;
+compute_nearerout (struct edge_list *edge_list, sbitmap *farthest,
+ sbitmap *st_avloc, sbitmap *nearer, sbitmap *nearerout)
{
- int bb, num_edges, i;
+ int num_edges, i;
edge e;
- basic_block *worklist, *tos;
+ 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 = (basic_block *) xmalloc (sizeof (basic_block)
- * (n_basic_blocks + 1));
+ tos = worklist = xmalloc (sizeof (basic_block) * (n_basic_blocks + 1));
/* Initialize NEARER for each edge and build a mapping from an edge to
its index. */
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 (e = EXIT_BLOCK_PTR->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR->preds)
sbitmap_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 (bb = 0; bb < n_basic_blocks; bb++)
+ FOR_EACH_BB (bb)
{
- basic_block b = BASIC_BLOCK (bb);
- *tos++ = b;
- b->aux = b;
+ *tos++ = bb;
+ bb->aux = bb;
}
-
+
/* Iterate until the worklist is empty. */
while (tos != worklist)
{
/* Take the first entry off the worklist. */
- basic_block b = *--tos;
- b->aux = NULL;
+ bb = *--tos;
+ bb->aux = NULL;
/* Compute the intersection of NEARER for each outgoing edge from B. */
- bb = b->index;
- sbitmap_ones (nearerout[bb]);
- for (e = b->succ; e != NULL; e = e->succ_next)
- sbitmap_a_and_b (nearerout[bb], nearerout[bb],
+ sbitmap_ones (nearerout[bb->index]);
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ sbitmap_a_and_b (nearerout[bb->index], nearerout[bb->index],
nearer[(size_t) e->aux]);
/* Calculate NEARER for all incoming edges. */
- for (e = b->pred; e != NULL; e = e->pred_next)
- {
- if (sbitmap_union_of_diff (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. */
- if (e->src != ENTRY_BLOCK_PTR && e->src->aux == 0)
- {
- *tos++ = e->src;
- e->src->aux = e;
- }
- }
- }
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ if (sbitmap_union_of_diff_cg (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. */
- sbitmap_ones (nearerout[n_basic_blocks]);
- for (e = ENTRY_BLOCK_PTR->succ; e != NULL; e = e->succ_next)
- sbitmap_a_and_b (nearerout[n_basic_blocks],
- nearerout[n_basic_blocks],
+ sbitmap_ones (nearerout[last_basic_block]);
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
+ sbitmap_a_and_b (nearerout[last_basic_block],
+ nearerout[last_basic_block],
nearer[(size_t) e->aux]);
+ clear_aux_for_edges ();
free (tos);
}
/* Compute the insertion and deletion points for edge based LCM. */
+
static void
-compute_rev_insert_delete (edge_list, st_avloc, nearer, nearerout,
- insert, delete)
- struct edge_list *edge_list;
- sbitmap *st_avloc, *nearer, *nearerout, *insert, *delete;
+compute_rev_insert_delete (struct edge_list *edge_list, sbitmap *st_avloc,
+ sbitmap *nearer, sbitmap *nearerout,
+ sbitmap *insert, sbitmap *delete)
{
int x;
+ basic_block bb;
+
+ FOR_EACH_BB (bb)
+ sbitmap_difference (delete[bb->index], st_avloc[bb->index],
+ nearerout[bb->index]);
- for (x = 0; x < n_basic_blocks; x++)
- sbitmap_difference (delete[x], st_avloc[x], nearerout[x]);
-
for (x = 0; x < NUM_EDGES (edge_list); x++)
{
basic_block b = INDEX_EDGE_PRED_BB (edge_list, x);
if (b == ENTRY_BLOCK_PTR)
- sbitmap_difference (insert[x], nearer[x], nearerout[n_basic_blocks]);
+ sbitmap_difference (insert[x], nearer[x], nearerout[last_basic_block]);
else
sbitmap_difference (insert[x], nearer[x], nearerout[b->index]);
}
}
-/* Given local properties TRANSP, ST_AVLOC, ST_ANTLOC, KILL return the
+/* Given local properties TRANSP, ST_AVLOC, ST_ANTLOC, KILL return the
insert and delete vectors for edge based reverse LCM. Returns an
edgelist which is used to map the insert vector to what edge
an expression should be inserted on. */
struct edge_list *
-pre_edge_rev_lcm (file, n_exprs, transp, st_avloc, st_antloc, kill,
- insert, delete)
- FILE *file ATTRIBUTE_UNUSED;
- int n_exprs;
- sbitmap *transp;
- sbitmap *st_avloc;
- sbitmap *st_antloc;
- sbitmap *kill;
- sbitmap **insert;
- sbitmap **delete;
+pre_edge_rev_lcm (FILE *file ATTRIBUTE_UNUSED, int n_exprs, sbitmap *transp,
+ sbitmap *st_avloc, sbitmap *st_antloc, sbitmap *kill,
+ sbitmap **insert, sbitmap **delete)
{
sbitmap *st_antin, *st_antout;
sbitmap *st_avout, *st_avin, *farthest;
edge_list = create_edge_list ();
num_edges = NUM_EDGES (edge_list);
- st_antin = (sbitmap *) sbitmap_vector_alloc (n_basic_blocks, n_exprs);
- st_antout = (sbitmap *) sbitmap_vector_alloc (n_basic_blocks, n_exprs);
- sbitmap_vector_zero (st_antin, n_basic_blocks);
- sbitmap_vector_zero (st_antout, n_basic_blocks);
+ st_antin = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ st_antout = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ sbitmap_vector_zero (st_antin, last_basic_block);
+ sbitmap_vector_zero (st_antout, last_basic_block);
compute_antinout_edge (st_antloc, transp, st_antin, st_antout);
/* Compute global anticipatability. */
- st_avout = sbitmap_vector_alloc (n_basic_blocks, n_exprs);
- st_avin = sbitmap_vector_alloc (n_basic_blocks, n_exprs);
+ st_avout = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ st_avin = sbitmap_vector_alloc (last_basic_block, n_exprs);
compute_available (st_avloc, kill, st_avout, st_avin);
#ifdef LCM_DEBUG_INFO
fprintf (file, "Edge List:\n");
verify_edge_list (file, edge_list);
print_edge_list (file, edge_list);
- dump_sbitmap_vector (file, "transp", "", transp, n_basic_blocks);
- dump_sbitmap_vector (file, "st_avloc", "", st_avloc, n_basic_blocks);
- dump_sbitmap_vector (file, "st_antloc", "", st_antloc, n_basic_blocks);
- dump_sbitmap_vector (file, "st_antin", "", st_antin, n_basic_blocks);
- dump_sbitmap_vector (file, "st_antout", "", st_antout, n_basic_blocks);
- dump_sbitmap_vector (file, "st_kill", "", kill, n_basic_blocks);
+ dump_sbitmap_vector (file, "transp", "", transp, last_basic_block);
+ dump_sbitmap_vector (file, "st_avloc", "", st_avloc, last_basic_block);
+ dump_sbitmap_vector (file, "st_antloc", "", st_antloc, last_basic_block);
+ dump_sbitmap_vector (file, "st_antin", "", st_antin, last_basic_block);
+ dump_sbitmap_vector (file, "st_antout", "", st_antout, last_basic_block);
+ dump_sbitmap_vector (file, "st_kill", "", kill, last_basic_block);
}
#endif
#ifdef LCM_DEBUG_INFO
if (file)
{
- dump_sbitmap_vector (file, "st_avout", "", st_avout, n_basic_blocks);
- dump_sbitmap_vector (file, "st_avin", "", st_avin, n_basic_blocks);
+ dump_sbitmap_vector (file, "st_avout", "", st_avout, last_basic_block);
+ dump_sbitmap_vector (file, "st_avin", "", st_avin, last_basic_block);
}
#endif
/* Compute farthestness. */
farthest = sbitmap_vector_alloc (num_edges, n_exprs);
- compute_farthest (edge_list, n_exprs, st_avout, st_avin, st_antin,
+ compute_farthest (edge_list, n_exprs, st_avout, st_avin, st_antin,
kill, farthest);
#ifdef LCM_DEBUG_INFO
dump_sbitmap_vector (file, "farthest", "", farthest, num_edges);
#endif
- free (st_avin);
- free (st_avout);
+ sbitmap_vector_free (st_antin);
+ sbitmap_vector_free (st_antout);
+
+ sbitmap_vector_free (st_avin);
+ sbitmap_vector_free (st_avout);
nearer = sbitmap_vector_alloc (num_edges, n_exprs);
+
/* Allocate an extra element for the entry block. */
- nearerout = sbitmap_vector_alloc (n_basic_blocks + 1, n_exprs);
+ nearerout = sbitmap_vector_alloc (last_basic_block + 1, n_exprs);
compute_nearerout (edge_list, farthest, st_avloc, nearer, nearerout);
#ifdef LCM_DEBUG_INFO
if (file)
{
- dump_sbitmap_vector (file, "nearerout", "", nearerout,
- n_basic_blocks + 1);
+ dump_sbitmap_vector (file, "nearerout", "", nearerout,
+ last_basic_block + 1);
dump_sbitmap_vector (file, "nearer", "", nearer, num_edges);
}
#endif
- free (farthest);
+ sbitmap_vector_free (farthest);
*insert = sbitmap_vector_alloc (num_edges, n_exprs);
- *delete = sbitmap_vector_alloc (n_basic_blocks, n_exprs);
- compute_rev_insert_delete (edge_list, st_avloc, nearer, nearerout, *insert, *delete);
+ *delete = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ compute_rev_insert_delete (edge_list, st_avloc, nearer, nearerout,
+ *insert, *delete);
- free (nearerout);
- free (nearer);
+ sbitmap_vector_free (nearerout);
+ sbitmap_vector_free (nearer);
#ifdef LCM_DEBUG_INFO
if (file)
{
dump_sbitmap_vector (file, "pre_insert_map", "", *insert, num_edges);
- dump_sbitmap_vector (file, "pre_delete_map", "", *delete, n_basic_blocks);
+ dump_sbitmap_vector (file, "pre_delete_map", "", *delete,
+ last_basic_block);
}
#endif
-
return edge_list;
}
-/* MODE SWITCHING */
-/* The algorithm for setting the modes consists of scanning the insn list
+/* Mode switching:
+
+ The algorithm for setting the modes consists of scanning the insn list
and finding all the insns which require a specific mode. Each insn gets
a unique struct seginfo element. These structures are inserted into a list
for each basic block. For each entity, there is an array of bb_info over
The LCM algorithm is then run over the flow graph to determine where to
place the sets to the highest-priority value in respect of first the first
- insn in any one block. Any adjustments required to the transparancy
+ insn in any one block. Any adjustments required to the transparency
vectors are made, then the next iteration starts for the next-lower
- priority mode, till for each entity all modes are exhasted.
+ priority mode, till for each entity all modes are exhausted.
More details are located in the code for optimize_mode_switching(). */
/* This structure contains the information for each insn which requires
- either single or double mode to be set.
+ either single or double mode to be set.
MODE is the mode this insn must be executed in.
- INSN_PTR is the insn to be executed.
+ INSN_PTR is the insn to be executed (may be the note that marks the
+ beginning of a basic block).
BBNUM is the flow graph basic block this insn occurs in.
NEXT is the next insn in the same basic block. */
-struct seginfo
+struct seginfo
{
int mode;
rtx insn_ptr;
/* These bitmaps are used for the LCM algorithm. */
+#ifdef OPTIMIZE_MODE_SWITCHING
static sbitmap *antic;
static sbitmap *transp;
static sbitmap *comp;
static sbitmap *delete;
static sbitmap *insert;
-static struct seginfo * new_seginfo PARAMS ((int, rtx, int, HARD_REG_SET));;
-static void add_seginfo PARAMS ((struct bb_info *, struct seginfo *));
-static void make_preds_opaque PARAMS ((basic_block, int));
-static void reg_dies PARAMS ((rtx, HARD_REG_SET));
-static void reg_becomes_live PARAMS ((rtx, rtx, void *));
+static struct seginfo * new_seginfo (int, rtx, int, HARD_REG_SET);
+static void add_seginfo (struct bb_info *, struct seginfo *);
+static void reg_dies (rtx, HARD_REG_SET);
+static void reg_becomes_live (rtx, rtx, void *);
+static void make_preds_opaque (basic_block, int);
+#endif
+\f
+#ifdef OPTIMIZE_MODE_SWITCHING
/* This function will allocate a new BBINFO structure, initialized
- with the FP_MODE, INSN, and basic block BB parameters. */
+ with the MODE, INSN, and basic block BB parameters. */
+
static struct seginfo *
-new_seginfo (mode, insn, bb, regs_live)
- int mode;
- rtx insn;
- int bb;
- HARD_REG_SET regs_live;
+new_seginfo (int mode, rtx insn, int bb, HARD_REG_SET regs_live)
{
struct seginfo *ptr;
ptr = xmalloc (sizeof (struct seginfo));
return ptr;
}
-/* Add a seginfo element to the end of a list.
+/* Add a seginfo element to the end of a list.
HEAD is a pointer to the list beginning.
INFO is the structure to be linked in. */
+
static void
-add_seginfo (head, info)
- struct bb_info *head;
- struct seginfo *info;
+add_seginfo (struct bb_info *head, struct seginfo *info)
{
struct seginfo *ptr;
{
ptr = head->seginfo;
while (ptr->next != NULL)
- ptr = ptr->next;
+ ptr = ptr->next;
ptr->next = info;
}
}
denotes that a mode set is to be done on that edge.
J is the bit number in the bitmaps that corresponds to the entity that
we are currently handling mode-switching for. */
+
static void
-make_preds_opaque (b, j)
- basic_block b;
- int j;
+make_preds_opaque (basic_block b, int j)
{
edge e;
+ edge_iterator ei;
- for (e = b->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, b->preds)
{
basic_block pb = e->src;
+
if (e->aux || ! TEST_BIT (transp[pb->index], j))
continue;
+
RESET_BIT (transp[pb->index], j);
make_preds_opaque (pb, j);
}
}
/* Record in LIVE that register REG died. */
+
static void
-reg_dies (reg, live)
- rtx reg;
- HARD_REG_SET live;
+reg_dies (rtx reg, HARD_REG_SET live)
{
- int regno;
+ int regno, nregs;
- if (GET_CODE (reg) != REG)
+ if (!REG_P (reg))
return;
+
regno = REGNO (reg);
if (regno < FIRST_PSEUDO_REGISTER)
- {
- int nregs = HARD_REGNO_NREGS (regno, GET_MODE (reg));
-
- for (; --nregs >=0; nregs--, regno++)
- CLEAR_HARD_REG_BIT (live, regno);
- }
+ for (nregs = hard_regno_nregs[regno][GET_MODE (reg)] - 1; nregs >= 0;
+ nregs--)
+ CLEAR_HARD_REG_BIT (live, regno + nregs);
}
/* Record in LIVE that register REG became live.
This is called via note_stores. */
+
static void
-reg_becomes_live (reg, setter, live)
- rtx reg;
- rtx setter ATTRIBUTE_UNUSED;
- void *live;
+reg_becomes_live (rtx reg, rtx setter ATTRIBUTE_UNUSED, void *live)
{
- int regno;
+ int regno, nregs;
if (GET_CODE (reg) == SUBREG)
reg = SUBREG_REG (reg);
- if (GET_CODE (reg) != REG)
+ if (!REG_P (reg))
return;
regno = REGNO (reg);
if (regno < FIRST_PSEUDO_REGISTER)
- {
- int nregs = HARD_REGNO_NREGS (regno, GET_MODE (reg));
-
- for (; nregs-- > 0; regno++)
- SET_HARD_REG_BIT (* (HARD_REG_SET *) live, regno);
- }
+ for (nregs = hard_regno_nregs[regno][GET_MODE (reg)] - 1; nregs >= 0;
+ nregs--)
+ SET_HARD_REG_BIT (* (HARD_REG_SET *) live, regno + nregs);
}
-/* Find all insns that need a particular mode
- setting, and insert the necessary mode switches. */
-void
-optimize_mode_switching (file)
- FILE *file ATTRIBUTE_UNUSED;
+/* Make sure if MODE_ENTRY is defined the MODE_EXIT is defined
+ and vice versa. */
+#if defined (MODE_ENTRY) != defined (MODE_EXIT)
+ #error "Both MODE_ENTRY and MODE_EXIT must be defined"
+#endif
+
+/* Find all insns that need a particular mode setting, and insert the
+ necessary mode switches. Return true if we did work. */
+
+int
+optimize_mode_switching (FILE *file)
{
-#ifdef OPTIMIZE_MODE_SWITCHING
rtx insn;
- int bb, e;
- edge eg;
+ int e;
+ basic_block bb;
int need_commit = 0;
sbitmap *kill;
struct edge_list *edge_list;
- static int num_modes[] = NUM_MODES_FOR_MODE_SWITCHING;
-#define N_ENTITIES (sizeof num_modes / sizeof (int))
+ 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;
int max_num_modes = 0;
+ bool emited = false;
+ basic_block post_entry ATTRIBUTE_UNUSED, pre_exit ATTRIBUTE_UNUSED;
+
+ clear_bb_flags ();
for (e = N_ENTITIES - 1, n_entities = 0; e >= 0; e--)
- {
- if (OPTIMIZE_MODE_SWITCHING (e))
- {
- /* Create the list of segments within each basic block. */
- bb_info[n_entities]
- = (struct bb_info *) xcalloc (n_basic_blocks, sizeof **bb_info);
- entity_map[n_entities++] = e;
- if (num_modes[e] > max_num_modes)
- max_num_modes = num_modes[e];
- }
- }
- if (! n_entities)
- return;
+ if (OPTIMIZE_MODE_SWITCHING (e))
+ {
+ int entry_exit_extra = 0;
-#ifdef MODE_USES_IN_EXIT_BLOCK
- /* For some ABIs a particular mode setting is required at function exit. */
+ /* 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 defined (MODE_ENTRY) && defined (MODE_EXIT)
+ entry_exit_extra = 2;
+#endif
+ bb_info[n_entities]
+ = xcalloc (last_basic_block + entry_exit_extra, sizeof **bb_info);
+ entity_map[n_entities++] = e;
+ if (num_modes[e] > max_num_modes)
+ max_num_modes = num_modes[e];
+ }
- for (eg = EXIT_BLOCK_PTR->pred; eg; eg = eg->pred_next)
- {
- int bb = eg->src->index;
-
- rtx insn = BLOCK_END (bb);
- rtx use = MODE_USES_IN_EXIT_BLOCK;
-
- /* If the block ends with the use of the return value
- and / or a return, insert the new use(s) in front of them. */
- while ((GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == USE)
- || GET_CODE (insn) == JUMP_INSN)
- insn = PREV_INSN (insn);
- use = emit_insn_after (use, insn);
- if (insn == BLOCK_END (bb))
- BLOCK_END (bb) = use;
- else if (NEXT_INSN (use) == BLOCK_HEAD (bb))
- BLOCK_HEAD (bb) = NEXT_INSN (insn);
- }
+ if (! n_entities)
+ return 0;
+
+#if defined (MODE_ENTRY) && defined (MODE_EXIT)
+ {
+ /* Split the edge from the entry block and the fallthrough edge to the
+ exit block, so that we can note that there NORMAL_MODE is supplied /
+ required. */
+ edge eg;
+ edge_iterator ei;
+ post_entry = split_edge (EDGE_SUCC (ENTRY_BLOCK_PTR, 0));
+ /* The only non-call predecessor at this stage is a block with a
+ fallthrough edge; there can be at most one, but there could be
+ none at all, e.g. when exit is called. */
+ pre_exit = 0;
+ FOR_EACH_EDGE (eg, ei, EXIT_BLOCK_PTR->preds)
+ if (eg->flags & EDGE_FALLTHRU)
+ {
+ regset live_at_end = eg->src->global_live_at_end;
+
+ gcc_assert (!pre_exit);
+ pre_exit = split_edge (eg);
+ COPY_REG_SET (pre_exit->global_live_at_start, live_at_end);
+ COPY_REG_SET (pre_exit->global_live_at_end, live_at_end);
+ }
+ }
#endif
/* Create the bitmap vectors. */
- antic = sbitmap_vector_alloc (n_basic_blocks, n_entities);
- transp = sbitmap_vector_alloc (n_basic_blocks, n_entities);
- comp = sbitmap_vector_alloc (n_basic_blocks, n_entities);
+ antic = sbitmap_vector_alloc (last_basic_block, n_entities);
+ transp = sbitmap_vector_alloc (last_basic_block, n_entities);
+ comp = sbitmap_vector_alloc (last_basic_block, n_entities);
- sbitmap_vector_ones (transp, n_basic_blocks);
+ sbitmap_vector_ones (transp, last_basic_block);
for (j = n_entities - 1; j >= 0; j--)
{
struct bb_info *info = bb_info[j];
/* Determine what the first use (if any) need for a mode of entity E is.
- This will be th mode that is anticipatable for this block.
+ This will be the mode that is anticipatable for this block.
Also compute the initial transparency settings. */
- for (bb = 0 ; bb < n_basic_blocks; bb++)
+ FOR_EACH_BB (bb)
{
struct seginfo *ptr;
int last_mode = no_mode;
HARD_REG_SET live_now;
REG_SET_TO_HARD_REG_SET (live_now,
- BASIC_BLOCK (bb)->global_live_at_start);
- for (insn = BLOCK_HEAD (bb);
- insn != NULL && insn != NEXT_INSN (BLOCK_END (bb));
+ bb->global_live_at_start);
+ for (insn = BB_HEAD (bb);
+ insn != NULL && insn != NEXT_INSN (BB_END (bb));
insn = NEXT_INSN (insn))
{
- if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
+ if (INSN_P (insn))
{
int mode = MODE_NEEDED (e, insn);
rtx link;
if (mode != no_mode && mode != last_mode)
{
last_mode = mode;
- ptr = new_seginfo (mode, insn, bb, live_now);
- add_seginfo (info + bb, ptr);
- RESET_BIT (transp[bb], j);
+ ptr = new_seginfo (mode, insn, bb->index, live_now);
+ add_seginfo (info + bb->index, ptr);
+ RESET_BIT (transp[bb->index], j);
}
-
+#ifdef MODE_AFTER
+ last_mode = MODE_AFTER (last_mode, insn);
+#endif
/* 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].computing = last_mode;
+
+ info[bb->index].computing = last_mode;
/* Check for blocks without ANY mode requirements. */
if (last_mode == no_mode)
{
- ptr = new_seginfo (no_mode, insn, bb, live_now);
- add_seginfo (info + bb, ptr);
+ ptr = new_seginfo (no_mode, BB_END (bb), bb->index, live_now);
+ add_seginfo (info + bb->index, ptr);
}
}
-#ifdef MODE_AT_ENTRY
+#if defined (MODE_ENTRY) && defined (MODE_EXIT)
{
- int mode = MODE_AT_ENTRY (e);
+ int mode = MODE_ENTRY (e);
+
if (mode != no_mode)
{
- for (eg = ENTRY_BLOCK_PTR->succ; eg; eg = eg->succ_next)
- {
- bb = eg->dest->index;
-
- /* 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. */
- RESET_BIT (transp[bb], j);
-
- /* If the block already has MODE, pretend it
- has none (because we don't need to set it),
- but retain whatever mode it computes. */
- if (info[bb].seginfo->mode == mode)
- {
- info[bb].seginfo->mode = no_mode;
- }
- /* Insert a fake computing definition of MODE into entry blocks
- which compute no mode. This represents the mode on entry. */
- else if (info[bb].computing == no_mode)
- {
- info[bb].computing = mode;
- info[bb].seginfo->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. */
+ RESET_BIT (transp[bb->index], j);
+
+ /* 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 = MODE_EXIT (e);
}
}
-#endif /* MODE_AT_ENTRY */
+#endif /* NORMAL_MODE */
}
- kill = sbitmap_vector_alloc (n_basic_blocks, n_entities);
+ kill = sbitmap_vector_alloc (last_basic_block, n_entities);
for (i = 0; i < max_num_modes; i++)
{
int current_mode[N_ENTITIES];
/* Set the anticipatable and computing arrays. */
- sbitmap_vector_zero (antic, n_basic_blocks);
- sbitmap_vector_zero (comp, n_basic_blocks);
+ sbitmap_vector_zero (antic, last_basic_block);
+ sbitmap_vector_zero (comp, last_basic_block);
for (j = n_entities - 1; j >= 0; j--)
{
int m = current_mode[j] = MODE_PRIORITY_TO_MODE (entity_map[j], i);
struct bb_info *info = bb_info[j];
-
- for (bb = 0 ; bb < n_basic_blocks; bb++)
- {
- if (info[bb].seginfo->mode == m)
- SET_BIT (antic[bb], j);
+ FOR_EACH_BB (bb)
+ {
+ if (info[bb->index].seginfo->mode == m)
+ SET_BIT (antic[bb->index], j);
- if (info[bb].computing == m)
- SET_BIT (comp[bb], j);
+ if (info[bb->index].computing == m)
+ SET_BIT (comp[bb->index], j);
}
}
/* Calculate the optimal locations for the
placement mode switches to modes with priority I. */
- for (bb = n_basic_blocks - 1; bb >= 0; bb--)
- sbitmap_not (kill[bb], transp[bb]);
+ FOR_EACH_BB (bb)
+ sbitmap_not (kill[bb->index], transp[bb->index]);
edge_list = pre_edge_lcm (file, 1, transp, comp, antic,
kill, &insert, &delete);
- for (j = n_entities - 1; j >=0; j--)
+ for (j = n_entities - 1; j >= 0; j--)
{
/* Insert all mode sets that have been inserted by lcm. */
int no_mode = num_modes[entity_map[j]];
+
/* Wherever we have moved a mode setting upwards in the flow graph,
the blocks between the new setting site and the now redundant
computation ceases to be transparent for any lower-priority
mode = current_mode[j];
src_bb = eg->src;
- REG_SET_TO_HARD_REG_SET (live_at_edge, src_bb->global_live_at_end);
+ REG_SET_TO_HARD_REG_SET (live_at_edge,
+ src_bb->global_live_at_end);
+
start_sequence ();
EMIT_MODE_SET (entity_map[j], mode, live_at_edge);
- mode_set = gen_sequence ();
+ mode_set = get_insns ();
end_sequence ();
- /* If this is an abnormal edge, we'll insert at the end of the
- previous block. */
+ /* Do not bother to insert empty sequence. */
+ if (mode_set == NULL_RTX)
+ continue;
+
+ /* If this is an abnormal edge, we'll insert at the end
+ of the previous block. */
if (eg->flags & EDGE_ABNORMAL)
{
-
- src_bb->end = emit_insn_after (mode_set, src_bb->end);
+ emited = true;
+ if (JUMP_P (BB_END (src_bb)))
+ emit_insn_before (mode_set, BB_END (src_bb));
+ /* It doesn't make sense to switch to normal mode
+ after a CALL_INSN, so we're going to abort if we
+ find one. The cases in which a CALL_INSN may
+ have an abnormal edge are sibcalls and EH edges.
+ In the case of sibcalls, the dest basic-block is
+ the EXIT_BLOCK, that runs in normal mode; it is
+ assumed that a sibcall insn requires normal mode
+ itself, so no mode switch would be required after
+ the call (it wouldn't make sense, anyway). In
+ the case of EH edges, EH entry points also start
+ in normal mode, so a similar reasoning applies. */
+ else if (NONJUMP_INSN_P (BB_END (src_bb)))
+ emit_insn_after (mode_set, BB_END (src_bb));
+ else
+ abort ();
bb_info[j][src_bb->index].computing = mode;
RESET_BIT (transp[src_bb->index], j);
}
need_commit = 1;
insert_insn_on_edge (mode_set, eg);
}
-
}
- for (bb = n_basic_blocks - 1; bb >= 0; bb--)
- {
- if (TEST_BIT (delete[bb], j))
- {
- make_preds_opaque (BASIC_BLOCK (bb), j);
- /* Cancel the 'deleted' mode set. */
- bb_info[j][bb].seginfo->mode = no_mode;
- }
- }
+ FOR_EACH_BB_REVERSE (bb)
+ if (TEST_BIT (delete[bb->index], j))
+ {
+ make_preds_opaque (bb, j);
+ /* Cancel the 'deleted' mode set. */
+ bb_info[j][bb->index].seginfo->mode = no_mode;
+ }
}
+
+ clear_aux_for_edges ();
free_edge_list (edge_list);
}
/* Now output the remaining mode sets in all the segments. */
for (j = n_entities - 1; j >= 0; j--)
{
- for (bb = n_basic_blocks - 1; bb >= 0; bb--)
+ int no_mode = num_modes[entity_map[j]];
+
+ FOR_EACH_BB_REVERSE (bb)
{
struct seginfo *ptr, *next;
- for (ptr = bb_info[j][bb].seginfo; ptr; ptr = next)
+ for (ptr = bb_info[j][bb->index].seginfo; ptr; ptr = next)
{
next = ptr->next;
- if (ptr->mode != FP_MODE_NONE)
+ if (ptr->mode != no_mode)
{
rtx mode_set;
start_sequence ();
EMIT_MODE_SET (entity_map[j], ptr->mode, ptr->regs_live);
- mode_set = gen_sequence ();
+ mode_set = get_insns ();
end_sequence ();
- emit_block_insn_before (mode_set, ptr->insn_ptr,
- BASIC_BLOCK (ptr->bbnum));
+ /* Do not bother to insert empty sequence. */
+ if (mode_set == NULL_RTX)
+ continue;
+
+ emited = true;
+ if (NOTE_P (ptr->insn_ptr)
+ && (NOTE_LINE_NUMBER (ptr->insn_ptr)
+ == NOTE_INSN_BASIC_BLOCK))
+ emit_insn_after (mode_set, ptr->insn_ptr);
+ else
+ emit_insn_before (mode_set, ptr->insn_ptr);
}
+
free (ptr);
}
}
+
free (bb_info[j]);
}
/* Finished. Free up all the things we've allocated. */
-
+
sbitmap_vector_free (kill);
sbitmap_vector_free (antic);
sbitmap_vector_free (transp);
if (need_commit)
commit_edge_insertions ();
-#endif /* OPTIMIZE_MODE_SWITCHING */
+
+#if defined (MODE_ENTRY) && defined (MODE_EXIT)
+ cleanup_cfg (CLEANUP_NO_INSN_DEL);
+#else
+ if (!need_commit && !emited)
+ return 0;
+#endif
+
+ max_regno = max_reg_num ();
+ allocate_reg_info (max_regno, FALSE, FALSE);
+ update_life_info_in_dirty_blocks (UPDATE_LIFE_GLOBAL_RM_NOTES,
+ (PROP_DEATH_NOTES | PROP_KILL_DEAD_CODE
+ | PROP_SCAN_DEAD_CODE));
+
+ return 1;
}
+#endif /* OPTIMIZE_MODE_SWITCHING */
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