/* Generic partial redundancy elimination with lazy code motion support.
- Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
+ Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* These routines are meant to be used by various optimization
passes which can be modeled as lazy code motion problems.
#include "regs.h"
#include "hard-reg-set.h"
#include "flags.h"
-#include "real.h"
#include "insn-config.h"
#include "recog.h"
#include "basic-block.h"
#include "output.h"
#include "tm_p.h"
#include "function.h"
+#include "sbitmap.h"
/* We want target macros for the mode switching code to be able to refer
to instruction attribute values. */
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 = xmalloc (sizeof (basic_block) * n_basic_blocks);
+ qin = qout = worklist = XNEWVEC (basic_block, n_basic_blocks);
/* We want a maximal solution, so make an optimistic initialization of
ANTIN. */
}
qin = worklist;
- qend = &worklist[n_basic_blocks];
- qlen = n_basic_blocks;
+ qend = &worklist[n_basic_blocks - NUM_FIXED_BLOCKS];
+ qlen = n_basic_blocks - NUM_FIXED_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. */
/* 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 = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
if (!e->src->aux && e->src != ENTRY_BLOCK_PTR)
{
*qin++ = e->src;
edge e;
basic_block *worklist, *qin, *qout, *qend, bb;
unsigned int qlen;
+ edge_iterator ei;
num_edges = NUM_EDGES (edge_list);
list if they were not already on the list. So the size is
bounded by the number of basic blocks. */
qin = qout = worklist
- = xmalloc (sizeof (basic_block) * (n_basic_blocks + 1));
+ = XNEWVEC (basic_block, n_basic_blocks);
/* 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)
+ 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
*qin++ = bb;
bb->aux = bb;
}
- qin = worklist;
+
/* 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. */
- qend = &worklist[n_basic_blocks];
- qlen = n_basic_blocks;
+ as EXIT_BLOCK is never inserted into it. */
+ qin = worklist;
+ qend = &worklist[n_basic_blocks - NUM_FIXED_BLOCKS];
+ qlen = n_basic_blocks - NUM_FIXED_BLOCKS;
/* Iterate until the worklist is empty. */
while (qlen)
/* Compute the intersection of LATERIN for each incoming edge to B. */
sbitmap_ones (laterin[bb->index]);
- for (e = bb->pred; e != NULL; e = e->pred_next)
- sbitmap_a_and_b (laterin[bb->index], laterin[bb->index], later[(size_t)e->aux]);
+ 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 = bb->succ; e != NULL; e = e->succ_next)
+ 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],
for the EXIT block. We allocated an extra entry in the LATERIN array
for just this purpose. */
sbitmap_ones (laterin[last_basic_block]);
- for (e = EXIT_BLOCK_PTR->pred; e != NULL; e = e->pred_next)
+ 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]);
static void
compute_insert_delete (struct edge_list *edge_list, sbitmap *antloc,
sbitmap *later, sbitmap *laterin, sbitmap *insert,
- sbitmap *delete)
+ sbitmap *del)
{
int x;
basic_block bb;
FOR_EACH_BB (bb)
- sbitmap_difference (delete[bb->index], antloc[bb->index], laterin[bb->index]);
+ sbitmap_difference (del[bb->index], antloc[bb->index],
+ laterin[bb->index]);
for (x = 0; x < NUM_EDGES (edge_list); x++)
{
map the insert vector to what edge an expression should be inserted on. */
struct edge_list *
-pre_edge_lcm (FILE *file ATTRIBUTE_UNUSED, int n_exprs, sbitmap *transp,
+pre_edge_lcm (int n_exprs, sbitmap *transp,
sbitmap *avloc, sbitmap *antloc, sbitmap *kill,
- sbitmap **insert, sbitmap **delete)
+ sbitmap **insert, sbitmap **del)
{
sbitmap *antin, *antout, *earliest;
sbitmap *avin, *avout;
num_edges = NUM_EDGES (edge_list);
#ifdef LCM_DEBUG_INFO
- if (file)
+ if (dump_file)
{
- fprintf (file, "Edge List:\n");
- verify_edge_list (file, edge_list);
- print_edge_list (file, edge_list);
- 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);
+ fprintf (dump_file, "Edge List:\n");
+ verify_edge_list (dump_file, edge_list);
+ print_edge_list (dump_file, edge_list);
+ dump_sbitmap_vector (dump_file, "transp", "", transp, last_basic_block);
+ dump_sbitmap_vector (dump_file, "antloc", "", antloc, last_basic_block);
+ dump_sbitmap_vector (dump_file, "avloc", "", avloc, last_basic_block);
+ dump_sbitmap_vector (dump_file, "kill", "", kill, last_basic_block);
}
#endif
compute_antinout_edge (antloc, transp, antin, antout);
#ifdef LCM_DEBUG_INFO
- if (file)
+ if (dump_file)
{
- dump_sbitmap_vector (file, "antin", "", antin, last_basic_block);
- dump_sbitmap_vector (file, "antout", "", antout, last_basic_block);
+ dump_sbitmap_vector (dump_file, "antin", "", antin, last_basic_block);
+ dump_sbitmap_vector (dump_file, "antout", "", antout, last_basic_block);
}
#endif
compute_earliest (edge_list, n_exprs, antin, antout, avout, kill, earliest);
#ifdef LCM_DEBUG_INFO
- if (file)
- dump_sbitmap_vector (file, "earliest", "", earliest, num_edges);
+ if (dump_file)
+ dump_sbitmap_vector (dump_file, "earliest", "", earliest, num_edges);
#endif
sbitmap_vector_free (antout);
compute_laterin (edge_list, earliest, antloc, later, laterin);
#ifdef LCM_DEBUG_INFO
- if (file)
+ if (dump_file)
{
- dump_sbitmap_vector (file, "laterin", "", laterin, last_basic_block + 1);
- dump_sbitmap_vector (file, "later", "", later, num_edges);
+ dump_sbitmap_vector (dump_file, "laterin", "", laterin, last_basic_block + 1);
+ dump_sbitmap_vector (dump_file, "later", "", later, num_edges);
}
#endif
sbitmap_vector_free (earliest);
*insert = sbitmap_vector_alloc (num_edges, n_exprs);
- *delete = sbitmap_vector_alloc (last_basic_block, n_exprs);
- compute_insert_delete (edge_list, antloc, later, laterin, *insert, *delete);
+ *del = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ compute_insert_delete (edge_list, antloc, later, laterin, *insert, *del);
sbitmap_vector_free (laterin);
sbitmap_vector_free (later);
#ifdef LCM_DEBUG_INFO
- if (file)
+ if (dump_file)
{
- dump_sbitmap_vector (file, "pre_insert_map", "", *insert, num_edges);
- dump_sbitmap_vector (file, "pre_delete_map", "", *delete,
+ dump_sbitmap_vector (dump_file, "pre_insert_map", "", *insert, num_edges);
+ dump_sbitmap_vector (dump_file, "pre_delete_map", "", *del,
last_basic_block);
}
#endif
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 = xmalloc (sizeof (basic_block) * n_basic_blocks);
+ qin = qout = worklist =
+ XNEWVEC (basic_block, n_basic_blocks - NUM_FIXED_BLOCKS);
/* We want a maximal solution. */
sbitmap_vector_ones (avout, last_basic_block);
}
qin = worklist;
- qend = &worklist[n_basic_blocks];
- qlen = n_basic_blocks;
+ qend = &worklist[n_basic_blocks - NUM_FIXED_BLOCKS];
+ qlen = n_basic_blocks - NUM_FIXED_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. */
sbitmap_intersection_of_preds (avin[bb->index], avout, bb->index);
}
- if (sbitmap_union_of_diff_cg (avout[bb->index], avloc[bb->index], avin[bb->index], kill[bb->index]))
+ 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 (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
if (!e->dest->aux && e->dest != EXIT_BLOCK_PTR)
{
*qin++ = e->dest;
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 = xmalloc (sizeof (basic_block) * (n_basic_blocks + 1));
+ tos = worklist = XNEWVEC (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
/* Compute the intersection of NEARER for each outgoing edge from B. */
sbitmap_ones (nearerout[bb->index]);
- for (e = bb->succ; e != NULL; e = e->succ_next)
+ 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 = bb->pred; e != NULL; e = e->pred_next)
+ 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],
for the ENTRY block. We allocated an extra entry in the NEAREROUT array
for just this purpose. */
sbitmap_ones (nearerout[last_basic_block]);
- for (e = ENTRY_BLOCK_PTR->succ; e != NULL; e = e->succ_next)
+ 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]);
static void
compute_rev_insert_delete (struct edge_list *edge_list, sbitmap *st_avloc,
sbitmap *nearer, sbitmap *nearerout,
- sbitmap *insert, sbitmap *delete)
+ sbitmap *insert, sbitmap *del)
{
int x;
basic_block bb;
FOR_EACH_BB (bb)
- sbitmap_difference (delete[bb->index], st_avloc[bb->index], nearerout[bb->index]);
+ sbitmap_difference (del[bb->index], st_avloc[bb->index],
+ nearerout[bb->index]);
for (x = 0; x < NUM_EDGES (edge_list); x++)
{
an expression should be inserted on. */
struct edge_list *
-pre_edge_rev_lcm (FILE *file ATTRIBUTE_UNUSED, int n_exprs, sbitmap *transp,
+pre_edge_rev_lcm (int n_exprs, sbitmap *transp,
sbitmap *st_avloc, sbitmap *st_antloc, sbitmap *kill,
- sbitmap **insert, sbitmap **delete)
+ sbitmap **insert, sbitmap **del)
{
sbitmap *st_antin, *st_antout;
sbitmap *st_avout, *st_avin, *farthest;
compute_available (st_avloc, kill, st_avout, st_avin);
#ifdef LCM_DEBUG_INFO
- if (file)
+ if (dump_file)
{
- fprintf (file, "Edge List:\n");
- verify_edge_list (file, edge_list);
- print_edge_list (file, edge_list);
- 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);
+ fprintf (dump_file, "Edge List:\n");
+ verify_edge_list (dump_file, edge_list);
+ print_edge_list (dump_file, edge_list);
+ dump_sbitmap_vector (dump_file, "transp", "", transp, last_basic_block);
+ dump_sbitmap_vector (dump_file, "st_avloc", "", st_avloc, last_basic_block);
+ dump_sbitmap_vector (dump_file, "st_antloc", "", st_antloc, last_basic_block);
+ dump_sbitmap_vector (dump_file, "st_antin", "", st_antin, last_basic_block);
+ dump_sbitmap_vector (dump_file, "st_antout", "", st_antout, last_basic_block);
+ dump_sbitmap_vector (dump_file, "st_kill", "", kill, last_basic_block);
}
#endif
#ifdef LCM_DEBUG_INFO
- if (file)
+ if (dump_file)
{
- dump_sbitmap_vector (file, "st_avout", "", st_avout, last_basic_block);
- dump_sbitmap_vector (file, "st_avin", "", st_avin, last_basic_block);
+ dump_sbitmap_vector (dump_file, "st_avout", "", st_avout, last_basic_block);
+ dump_sbitmap_vector (dump_file, "st_avin", "", st_avin, last_basic_block);
}
#endif
kill, farthest);
#ifdef LCM_DEBUG_INFO
- if (file)
- dump_sbitmap_vector (file, "farthest", "", farthest, num_edges);
+ if (dump_file)
+ dump_sbitmap_vector (dump_file, "farthest", "", farthest, num_edges);
#endif
sbitmap_vector_free (st_antin);
compute_nearerout (edge_list, farthest, st_avloc, nearer, nearerout);
#ifdef LCM_DEBUG_INFO
- if (file)
+ if (dump_file)
{
- dump_sbitmap_vector (file, "nearerout", "", nearerout,
+ dump_sbitmap_vector (dump_file, "nearerout", "", nearerout,
last_basic_block + 1);
- dump_sbitmap_vector (file, "nearer", "", nearer, num_edges);
+ dump_sbitmap_vector (dump_file, "nearer", "", nearer, num_edges);
}
#endif
sbitmap_vector_free (farthest);
*insert = sbitmap_vector_alloc (num_edges, n_exprs);
- *delete = sbitmap_vector_alloc (last_basic_block, n_exprs);
+ *del = sbitmap_vector_alloc (last_basic_block, n_exprs);
compute_rev_insert_delete (edge_list, st_avloc, nearer, nearerout,
- *insert, *delete);
+ *insert, *del);
sbitmap_vector_free (nearerout);
sbitmap_vector_free (nearer);
#ifdef LCM_DEBUG_INFO
- if (file)
+ if (dump_file)
{
- dump_sbitmap_vector (file, "pre_insert_map", "", *insert, num_edges);
- dump_sbitmap_vector (file, "pre_delete_map", "", *delete,
+ dump_sbitmap_vector (dump_file, "pre_insert_map", "", *insert, num_edges);
+ dump_sbitmap_vector (dump_file, "pre_delete_map", "", *del,
last_basic_block);
}
#endif
return edge_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 flow graph basic blocks (local var 'bb_info'), and contains a list
- of all insns within that basic block, in the order they are encountered.
-
- For each entity, any basic block WITHOUT any insns requiring a specific
- mode are given a single entry, without a mode. (Each basic block
- in the flow graph must have at least one entry in the segment table.)
-
- 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 transparency
- vectors are made, then the next iteration starts for the next-lower
- 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.
- MODE is the mode this insn must be executed in.
- 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
-{
- int mode;
- rtx insn_ptr;
- int bbnum;
- struct seginfo *next;
- HARD_REG_SET regs_live;
-};
-
-struct bb_info
-{
- struct seginfo *seginfo;
- int computing;
-};
-
-/* 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 (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 MODE, INSN, and basic block BB parameters. */
-
-static struct seginfo *
-new_seginfo (int mode, rtx insn, int bb, HARD_REG_SET regs_live)
-{
- struct seginfo *ptr;
- ptr = xmalloc (sizeof (struct seginfo));
- ptr->mode = mode;
- ptr->insn_ptr = insn;
- ptr->bbnum = bb;
- ptr->next = NULL;
- COPY_HARD_REG_SET (ptr->regs_live, regs_live);
- return ptr;
-}
-
-/* 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 (struct bb_info *head, struct seginfo *info)
-{
- struct seginfo *ptr;
-
- if (head->seginfo == NULL)
- head->seginfo = info;
- else
- {
- ptr = head->seginfo;
- while (ptr->next != NULL)
- ptr = ptr->next;
- ptr->next = info;
- }
-}
-
-/* Make all predecessors of basic block B opaque, recursively, till we hit
- some that are already non-transparent, or an edge where aux is set; that
- 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 (basic_block b, int j)
-{
- edge e;
-
- for (e = b->pred; e; e = e->pred_next)
- {
- 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 (rtx reg, HARD_REG_SET live)
-{
- int regno, nregs;
-
- if (GET_CODE (reg) != REG)
- return;
-
- regno = REGNO (reg);
- if (regno < FIRST_PSEUDO_REGISTER)
- 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 (rtx reg, rtx setter ATTRIBUTE_UNUSED, void *live)
-{
- int regno, nregs;
-
- if (GET_CODE (reg) == SUBREG)
- reg = SUBREG_REG (reg);
-
- if (GET_CODE (reg) != REG)
- return;
-
- regno = REGNO (reg);
- if (regno < FIRST_PSEUDO_REGISTER)
- for (nregs = HARD_REGNO_NREGS (regno, GET_MODE (reg)) - 1; nregs >= 0;
- nregs--)
- SET_HARD_REG_BIT (* (HARD_REG_SET *) live, regno + nregs);
-}
-
-/* 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)
-{
- rtx insn;
- int e;
- basic_block bb;
- int need_commit = 0;
- sbitmap *kill;
- struct edge_list *edge_list;
- 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))
- {
- 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 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];
- }
-
- 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;
- post_entry = split_edge (ENTRY_BLOCK_PTR->succ);
- /* 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. */
- for (pre_exit = 0, eg = EXIT_BLOCK_PTR->pred; eg; eg = eg->pred_next)
- if (eg->flags & EDGE_FALLTHRU)
- {
- regset live_at_end = eg->src->global_live_at_end;
-
- if (pre_exit)
- abort ();
- 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 (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, last_basic_block);
-
- 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];
-
- /* 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 (bb)
- {
- struct seginfo *ptr;
- int last_mode = no_mode;
- HARD_REG_SET live_now;
-
- REG_SET_TO_HARD_REG_SET (live_now,
- bb->global_live_at_start);
- for (insn = BB_HEAD (bb);
- insn != NULL && insn != NEXT_INSN (BB_END (bb));
- insn = NEXT_INSN (insn))
- {
- 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->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->index].computing = last_mode;
- /* Check for blocks without ANY mode requirements. */
- if (last_mode == no_mode)
- {
- ptr = new_seginfo (no_mode, BB_END (bb), bb->index, live_now);
- add_seginfo (info + bb->index, ptr);
- }
- }
-#if defined (MODE_ENTRY) && defined (MODE_EXIT)
- {
- int mode = MODE_ENTRY (e);
-
- 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. */
- 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 /* NORMAL_MODE */
- }
-
- 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, 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_EACH_BB (bb)
- {
- if (info[bb->index].seginfo->mode == m)
- SET_BIT (antic[bb->index], 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_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--)
- {
- /* 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 of the same entity. First set the aux field of each
- insertion site edge non-transparent, then propagate the new
- non-transparency from the redundant computation upwards till
- we hit an insertion site or an already non-transparent block. */
- for (e = NUM_EDGES (edge_list) - 1; e >= 0; e--)
- {
- edge eg = INDEX_EDGE (edge_list, e);
- int mode;
- basic_block src_bb;
- HARD_REG_SET live_at_edge;
- rtx mode_set;
-
- eg->aux = 0;
-
- if (! TEST_BIT (insert[e], j))
- continue;
-
- eg->aux = (void *)1;
-
- mode = current_mode[j];
- src_bb = eg->src;
-
- 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 = get_insns ();
- end_sequence ();
-
- /* 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)
- {
- emited = true;
- if (GET_CODE (BB_END (src_bb)) == JUMP_INSN)
- 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 (GET_CODE (BB_END (src_bb)) == INSN)
- 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);
- }
- else
- {
- need_commit = 1;
- insert_insn_on_edge (mode_set, eg);
- }
- }
-
- 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--)
- {
- int no_mode = num_modes[entity_map[j]];
-
- FOR_EACH_BB_REVERSE (bb)
- {
- struct seginfo *ptr, *next;
- for (ptr = bb_info[j][bb->index].seginfo; ptr; ptr = next)
- {
- next = ptr->next;
- if (ptr->mode != no_mode)
- {
- rtx mode_set;
-
- start_sequence ();
- EMIT_MODE_SET (entity_map[j], ptr->mode, ptr->regs_live);
- mode_set = get_insns ();
- end_sequence ();
-
- /* Do not bother to insert empty sequence. */
- if (mode_set == NULL_RTX)
- continue;
-
- emited = true;
- if (GET_CODE (ptr->insn_ptr) == NOTE
- && (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);
- sbitmap_vector_free (comp);
- sbitmap_vector_free (delete);
- sbitmap_vector_free (insert);
-
- if (need_commit)
- commit_edge_insertions ();
-
-#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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