/* Standard problems for dataflow support routines.
- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
- Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+ 2008 Free Software Foundation, Inc.
Originally contributed by Michael P. Hayes
(m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
Major rewrite contributed by Danny Berlin (dberlin@dberlin.org)
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "bitmap.h"
#include "timevar.h"
#include "df.h"
+#include "except.h"
+#include "dce.h"
+#include "vecprim.h"
+
+/* Note that turning REG_DEAD_DEBUGGING on will cause
+ gcc.c-torture/unsorted/dump-noaddr.c to fail because it prints
+ addresses in the dumps. */
+#if 0
+#define REG_DEAD_DEBUGGING
+#endif
#define DF_SPARSE_THRESHOLD 32
/*----------------------------------------------------------------------------
Public functions access functions for the dataflow problems.
----------------------------------------------------------------------------*/
-
-/* Get the instance of the problem that DFLOW is dependent on. */
-
-struct dataflow *
-df_get_dependent_problem (struct dataflow *dflow)
-{
- struct df *df = dflow->df;
- struct df_problem *dependent_problem = dflow->problem->dependent_problem;
-
- gcc_assert (dependent_problem);
- return df->problems_by_index[dependent_problem->id];
-}
-
-
-/* Create a du or ud chain from SRC to DST and link it into SRC. */
-
-struct df_link *
-df_chain_create (struct dataflow *dflow, struct df_ref *src, struct df_ref *dst)
-{
- struct df_link *head = DF_REF_CHAIN (src);
- struct df_link *link = pool_alloc (dflow->block_pool);;
-
- DF_REF_CHAIN (src) = link;
- link->next = head;
- link->ref = dst;
- return link;
-}
-
-
-/* Delete a du or ud chain for REF. If LINK is NULL, delete all
- chains for ref and check to see if the reverse chains can also be
- deleted. If LINK is not NULL it must be a link off of ref. In
- this case, the other end is not deleted. */
-
-void
-df_chain_unlink (struct dataflow *dflow, struct df_ref *ref, struct df_link *link)
-{
- struct df_link *chain = DF_REF_CHAIN (ref);
- if (link)
- {
- /* Link was the first element in the chain. */
- if (chain == link)
- DF_REF_CHAIN (ref) = link->next;
- else
- {
- /* Link is an internal element in the chain. */
- struct df_link *prev = chain;
- while (chain)
- {
- if (chain == link)
- {
- prev->next = chain->next;
- break;
- }
- prev = chain;
- chain = chain->next;
- }
- }
- pool_free (dflow->block_pool, link);
- }
- else
- {
- /* If chain is NULL here, it was because of a recursive call
- when the other flavor of chains was not built. Just run thru
- the entire chain calling the other side and then deleting the
- link. */
- while (chain)
- {
- struct df_link *next = chain->next;
- /* Delete the other side if it exists. */
- df_chain_unlink (dflow, chain->ref, chain);
- chain = next;
- }
- }
-}
-
-
-/* Copy the du or ud chain starting at FROM_REF and attach it to
- TO_REF. */
-
-void
-df_chain_copy (struct dataflow *dflow,
- struct df_ref *to_ref,
- struct df_link *from_ref)
-{
- while (from_ref)
- {
- df_chain_create (dflow, to_ref, from_ref->ref);
- from_ref = from_ref->next;
- }
-}
-
-
-/* Get the live in set for BB no matter what problem happens to be
- defined. */
+/* Get the live at out set for BB no matter what problem happens to be
+ defined. This function is used by the register allocators who
+ choose different dataflow problems depending on the optimization
+ level. */
bitmap
-df_get_live_in (struct df *df, basic_block bb)
+df_get_live_out (basic_block bb)
{
- gcc_assert (df->problems_by_index[DF_LR]);
+ gcc_assert (df_lr);
- if (df->problems_by_index[DF_UREC])
- return DF_RA_LIVE_IN (df, bb);
- else if (df->problems_by_index[DF_UR])
- return DF_LIVE_IN (df, bb);
+ if (df_live)
+ return DF_LIVE_OUT (bb);
else
- return DF_UPWARD_LIVE_IN (df, bb);
+ return DF_LR_OUT (bb);
}
-
-/* Get the live out set for BB no matter what problem happens to be
- defined. */
+/* Get the live at in set for BB no matter what problem happens to be
+ defined. This function is used by the register allocators who
+ choose different dataflow problems depending on the optimization
+ level. */
bitmap
-df_get_live_out (struct df *df, basic_block bb)
+df_get_live_in (basic_block bb)
{
- gcc_assert (df->problems_by_index[DF_LR]);
+ gcc_assert (df_lr);
- if (df->problems_by_index[DF_UREC])
- return DF_RA_LIVE_OUT (df, bb);
- else if (df->problems_by_index[DF_UR])
- return DF_LIVE_OUT (df, bb);
+ if (df_live)
+ return DF_LIVE_IN (bb);
else
- return DF_UPWARD_LIVE_OUT (df, bb);
+ return DF_LR_IN (bb);
}
-
/*----------------------------------------------------------------------------
Utility functions.
----------------------------------------------------------------------------*/
if (dflow->block_info_size < new_size)
{
new_size += new_size / 4;
- dflow->block_info = xrealloc (dflow->block_info,
- new_size *sizeof (void*));
+ dflow->block_info = XRESIZEVEC (void *, dflow->block_info, new_size);
memset (dflow->block_info + dflow->block_info_size, 0,
(new_size - dflow->block_info_size) *sizeof (void *));
dflow->block_info_size = new_size;
/* Dump a def-use or use-def chain for REF to FILE. */
void
-df_chain_dump (struct df *df ATTRIBUTE_UNUSED, struct df_link *link, FILE *file)
+df_chain_dump (struct df_link *link, FILE *file)
{
fprintf (file, "{ ");
for (; link; link = link->next)
DF_REF_REG_DEF_P (link->ref) ? 'd' : 'u',
DF_REF_ID (link->ref),
DF_REF_BBNO (link->ref),
- DF_REF_INSN (link->ref) ? DF_REF_INSN_UID (link->ref) : -1);
+ DF_REF_INSN_INFO (link->ref) ? DF_REF_INSN_UID (link->ref) : -1);
}
fprintf (file, "}");
}
edge e;
edge_iterator ei;
- fprintf (file, "( ");
+ fprintf (file, "\n( ");
FOR_EACH_EDGE (e, ei, bb->preds)
{
basic_block pred = e->src;
- fprintf (file, "%d ", pred->index);
+ fprintf (file, "%d%s ", pred->index, e->flags & EDGE_EH ? "(EH)" : "");
}
fprintf (file, ")->[%d]->( ", bb->index);
FOR_EACH_EDGE (e, ei, bb->succs)
{
basic_block succ = e->dest;
- fprintf (file, "%d ", succ->index);
+ fprintf (file, "%d%s ", succ->index, e->flags & EDGE_EH ? "(EH)" : "");
}
fprintf (file, ")\n");
}
-/* Return the set of reference ids in CHAIN, caching the result in *BMAP. */
-
-static inline bitmap
-df_ref_bitmap (bitmap *maps, unsigned int regno, int start, int count)
-{
- bitmap ids = maps[regno];
- if (!ids)
- {
- unsigned int i;
- unsigned int end = start + count;;
- ids = BITMAP_ALLOC (NULL);
- maps[regno] = ids;
- for (i = start; i < end; i++)
- bitmap_set_bit (ids, i);
- }
- return ids;
-}
-
/* Make sure that the seen_in_insn and seen_in_block sbitmaps are set
up correctly. */
static void
df_set_seen (void)
{
- seen_in_block = BITMAP_ALLOC (NULL);
- seen_in_insn = BITMAP_ALLOC (NULL);
+ seen_in_block = BITMAP_ALLOC (&df_bitmap_obstack);
+ seen_in_insn = BITMAP_ALLOC (&df_bitmap_obstack);
}
\f
/*----------------------------------------------------------------------------
- REACHING USES
-
- Find the locations in the function where each use site for a pseudo
- can reach backwards.
-
-----------------------------------------------------------------------------*/
+ REACHING DEFINITIONS
-struct df_ru_problem_data
+ Find the locations in the function where each definition site for a
+ pseudo reaches. In and out bitvectors are built for each basic
+ block. The id field in the ref is used to index into these sets.
+ See df.h for details.
+ ----------------------------------------------------------------------------*/
+
+/* This problem plays a large number of games for the sake of
+ efficiency.
+
+ 1) The order of the bits in the bitvectors. After the scanning
+ phase, all of the defs are sorted. All of the defs for the reg 0
+ are first, followed by all defs for reg 1 and so on.
+
+ 2) There are two kill sets, one if the number of defs is less or
+ equal to DF_SPARSE_THRESHOLD and another if the number of defs is
+ greater.
+
+ <= : Data is built directly in the kill set.
+
+ > : One level of indirection is used to keep from generating long
+ strings of 1 bits in the kill sets. Bitvectors that are indexed
+ by the regnum are used to represent that there is a killing def
+ for the register. The confluence and transfer functions use
+ these along with the bitmap_clear_range call to remove ranges of
+ bits without actually generating a knockout vector.
+
+ The kill and sparse_kill and the dense_invalidated_by_call and
+ sparse_invalidated_by_call both play this game. */
+
+/* Private data used to compute the solution for this problem. These
+ data structures are not accessible outside of this module. */
+struct df_rd_problem_data
{
- bitmap *use_sites; /* Bitmap of uses for each pseudo. */
- unsigned int use_sites_size; /* Size of use_sites. */
/* The set of defs to regs invalidated by call. */
bitmap sparse_invalidated_by_call;
- /* The set of defs to regs invalidated by call for ru. */
- bitmap dense_invalidated_by_call;
+ /* The set of defs to regs invalidate by call for rd. */
+ bitmap dense_invalidated_by_call;
+ /* An obstack for the bitmaps we need for this problem. */
+ bitmap_obstack rd_bitmaps;
};
-/* Get basic block info. */
-
-struct df_ru_bb_info *
-df_ru_get_bb_info (struct dataflow *dflow, unsigned int index)
-{
- return (struct df_ru_bb_info *) dflow->block_info[index];
-}
-
-
/* Set basic block info. */
static void
-df_ru_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_ru_bb_info *bb_info)
+df_rd_set_bb_info (unsigned int index,
+ struct df_rd_bb_info *bb_info)
{
- dflow->block_info[index] = bb_info;
+ gcc_assert (df_rd);
+ gcc_assert (index < df_rd->block_info_size);
+ df_rd->block_info[index] = bb_info;
}
/* Free basic block info. */
static void
-df_ru_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
+df_rd_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
- struct df_ru_bb_info *bb_info = (struct df_ru_bb_info *) vbb_info;
+ struct df_rd_bb_info *bb_info = (struct df_rd_bb_info *) vbb_info;
if (bb_info)
{
BITMAP_FREE (bb_info->kill);
BITMAP_FREE (bb_info->gen);
BITMAP_FREE (bb_info->in);
BITMAP_FREE (bb_info->out);
- pool_free (dflow->block_pool, bb_info);
+ pool_free (df_rd->block_pool, bb_info);
}
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
+/* Allocate or reset bitmaps for DF_RD blocks. The solution bits are
not touched unless the block is new. */
static void
-df_ru_alloc (struct dataflow *dflow, bitmap blocks_to_rescan)
+df_rd_alloc (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
- unsigned int reg_size = max_reg_num ();
+ struct df_rd_problem_data *problem_data;
- if (! dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_ru_block pool",
- sizeof (struct df_ru_bb_info), 50);
+ if (!df_rd->block_pool)
+ df_rd->block_pool = create_alloc_pool ("df_rd_block pool",
+ sizeof (struct df_rd_bb_info), 50);
- if (dflow->problem_data)
+ if (df_rd->problem_data)
{
- unsigned int i;
- struct df_ru_problem_data *problem_data =
- (struct df_ru_problem_data *) dflow->problem_data;
-
- for (i = 0; i < problem_data->use_sites_size; i++)
- {
- bitmap bm = problem_data->use_sites[i];
- if (bm)
- {
- BITMAP_FREE (bm);
- problem_data->use_sites[i] = NULL;
- }
- }
-
- if (problem_data->use_sites_size < reg_size)
- {
- problem_data->use_sites
- = xrealloc (problem_data->use_sites, reg_size * sizeof (bitmap));
- memset (problem_data->use_sites + problem_data->use_sites_size, 0,
- (reg_size - problem_data->use_sites_size) * sizeof (bitmap));
- problem_data->use_sites_size = reg_size;
- }
-
+ problem_data = (struct df_rd_problem_data *) df_rd->problem_data;
bitmap_clear (problem_data->sparse_invalidated_by_call);
bitmap_clear (problem_data->dense_invalidated_by_call);
}
else
{
- struct df_ru_problem_data *problem_data = XNEW (struct df_ru_problem_data);
- dflow->problem_data = problem_data;
+ problem_data = XNEW (struct df_rd_problem_data);
+ df_rd->problem_data = problem_data;
- problem_data->use_sites = XCNEWVEC (bitmap, reg_size);
- problem_data->use_sites_size = reg_size;
- problem_data->sparse_invalidated_by_call = BITMAP_ALLOC (NULL);
- problem_data->dense_invalidated_by_call = BITMAP_ALLOC (NULL);
+ bitmap_obstack_initialize (&problem_data->rd_bitmaps);
+ problem_data->sparse_invalidated_by_call
+ = BITMAP_ALLOC (&problem_data->rd_bitmaps);
+ problem_data->dense_invalidated_by_call
+ = BITMAP_ALLOC (&problem_data->rd_bitmaps);
}
- df_grow_bb_info (dflow);
+ df_grow_bb_info (df_rd);
- /* Because of the clustering of all def sites for the same pseudo,
+ /* Because of the clustering of all use sites for the same pseudo,
we have to process all of the blocks before doing the
analysis. */
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_rescan, 0, bb_index, bi)
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb_index);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
if (bb_info)
{
bitmap_clear (bb_info->kill);
}
else
{
- bb_info = (struct df_ru_bb_info *) pool_alloc (dflow->block_pool);
- df_ru_set_bb_info (dflow, bb_index, bb_info);
- bb_info->kill = BITMAP_ALLOC (NULL);
- bb_info->sparse_kill = BITMAP_ALLOC (NULL);
- bb_info->gen = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
+ bb_info = (struct df_rd_bb_info *) pool_alloc (df_rd->block_pool);
+ df_rd_set_bb_info (bb_index, bb_info);
+ bb_info->kill = BITMAP_ALLOC (&problem_data->rd_bitmaps);
+ bb_info->sparse_kill = BITMAP_ALLOC (&problem_data->rd_bitmaps);
+ bb_info->gen = BITMAP_ALLOC (&problem_data->rd_bitmaps);
+ bb_info->in = BITMAP_ALLOC (&problem_data->rd_bitmaps);
+ bb_info->out = BITMAP_ALLOC (&problem_data->rd_bitmaps);
}
}
+ df_rd->optional_p = true;
}
-/* Process a list of DEFs for df_ru_bb_local_compute. */
+/* Process a list of DEFs for df_rd_bb_local_compute. */
static void
-df_ru_bb_local_compute_process_def (struct dataflow *dflow,
- struct df_ru_bb_info *bb_info,
- struct df_ref *def,
+df_rd_bb_local_compute_process_def (struct df_rd_bb_info *bb_info,
+ struct df_ref **def_rec,
enum df_ref_flags top_flag)
{
- struct df *df = dflow->df;
- while (def)
+ while (*def_rec)
{
+ struct df_ref *def = *def_rec;
if (top_flag == (DF_REF_FLAGS (def) & DF_REF_AT_TOP))
{
unsigned int regno = DF_REF_REGNO (def);
- unsigned int begin = DF_REG_USE_GET (df, regno)->begin;
- unsigned int n_uses = DF_REG_USE_GET (df, regno)->n_refs;
- if (!bitmap_bit_p (seen_in_block, regno))
+ unsigned int begin = DF_DEFS_BEGIN (regno);
+ unsigned int n_defs = DF_DEFS_COUNT (regno);
+
+ if ((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (regno >= FIRST_PSEUDO_REGISTER))
{
- /* The first def for regno, causes the kill info to be
- generated and the gen information to cleared. */
- if (!bitmap_bit_p (seen_in_insn, regno))
+ /* Only the last def(s) for a regno in the block has any
+ effect. */
+ if (!bitmap_bit_p (seen_in_block, regno))
{
- if (n_uses > DF_SPARSE_THRESHOLD)
- {
- bitmap_set_bit (bb_info->sparse_kill, regno);
- bitmap_clear_range (bb_info->gen, begin, n_uses);
- }
- else
+ /* The first def for regno in insn gets to knock out the
+ defs from other instructions. */
+ if ((!bitmap_bit_p (seen_in_insn, regno))
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ && (!(DF_REF_FLAGS (def) &
+ (DF_REF_PARTIAL | DF_REF_CONDITIONAL | DF_REF_MAY_CLOBBER))))
{
- struct df_ru_problem_data * problem_data =
- (struct df_ru_problem_data *)dflow->problem_data;
- bitmap uses =
- df_ref_bitmap (problem_data->use_sites, regno,
- begin, n_uses);
- bitmap_ior_into (bb_info->kill, uses);
- bitmap_and_compl_into (bb_info->gen, uses);
+ if (n_defs > DF_SPARSE_THRESHOLD)
+ {
+ bitmap_set_bit (bb_info->sparse_kill, regno);
+ bitmap_clear_range(bb_info->gen, begin, n_defs);
+ }
+ else
+ {
+ bitmap_set_range (bb_info->kill, begin, n_defs);
+ bitmap_clear_range (bb_info->gen, begin, n_defs);
+ }
}
+
+ bitmap_set_bit (seen_in_insn, regno);
+ /* All defs for regno in the instruction may be put into
+ the gen set. */
+ if (!(DF_REF_FLAGS (def)
+ & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
+ bitmap_set_bit (bb_info->gen, DF_REF_ID (def));
}
- bitmap_set_bit (seen_in_insn, regno);
}
}
- def = def->next_ref;
+ def_rec++;
}
}
+/* Compute local reaching def info for basic block BB. */
-/* Process a list of USEs for df_ru_bb_local_compute. */
-
-static void
-df_ru_bb_local_compute_process_use (struct df_ru_bb_info *bb_info,
- struct df_ref *use,
- enum df_ref_flags top_flag)
-{
- while (use)
- {
- if (top_flag == (DF_REF_FLAGS (use) & DF_REF_AT_TOP))
- {
- /* Add use to set of gens in this BB unless we have seen a
- def in a previous instruction. */
- unsigned int regno = DF_REF_REGNO (use);
- if (!bitmap_bit_p (seen_in_block, regno))
- bitmap_set_bit (bb_info->gen, DF_REF_ID (use));
- }
- use = use->next_ref;
- }
-}
-
-/* Compute local reaching use (upward exposed use) info for basic
- block BB. USE_INFO->REGS[R] caches the set of uses for register R. */
static void
-df_ru_bb_local_compute (struct dataflow *dflow, unsigned int bb_index)
+df_rd_bb_local_compute (unsigned int bb_index)
{
- struct df *df = dflow->df;
basic_block bb = BASIC_BLOCK (bb_index);
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb_index);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
rtx insn;
- /* Set when a def for regno is seen. */
bitmap_clear (seen_in_block);
bitmap_clear (seen_in_insn);
-#ifdef EH_USES
- /* Variables defined in the prolog that are used by the exception
- handler. */
- df_ru_bb_local_compute_process_use (bb_info,
- df_get_artificial_uses (df, bb_index),
- DF_REF_AT_TOP);
-#endif
- df_ru_bb_local_compute_process_def (dflow, bb_info,
- df_get_artificial_defs (df, bb_index),
- DF_REF_AT_TOP);
+ /* Artificials are only hard regs. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_rd_bb_local_compute_process_def (bb_info,
+ df_get_artificial_defs (bb_index),
+ 0);
- FOR_BB_INSNS (bb, insn)
+ FOR_BB_INSNS_REVERSE (bb, insn)
{
unsigned int uid = INSN_UID (insn);
- if (! INSN_P (insn))
- continue;
- df_ru_bb_local_compute_process_def (dflow, bb_info,
- DF_INSN_UID_GET (df, uid)->defs, 0);
+ if (!INSN_P (insn))
+ continue;
- /* The use processing must happen after the defs processing even
- though the uses logically happen first since the defs clear
- the gen set. Otherwise, a use for regno occuring in the same
- instruction as a def for regno would be cleared. */
- df_ru_bb_local_compute_process_use (bb_info,
- DF_INSN_UID_GET (df, uid)->uses, 0);
+ df_rd_bb_local_compute_process_def (bb_info,
+ DF_INSN_UID_DEFS (uid), 0);
+ /* This complex dance with the two bitmaps is required because
+ instructions can assign twice to the same pseudo. This
+ generally happens with calls that will have one def for the
+ result and another def for the clobber. If only one vector
+ is used and the clobber goes first, the result will be
+ lost. */
bitmap_ior_into (seen_in_block, seen_in_insn);
bitmap_clear (seen_in_insn);
}
- /* Process the hardware registers that are always live. */
- df_ru_bb_local_compute_process_use (bb_info,
- df_get_artificial_uses (df, bb_index), 0);
-
- df_ru_bb_local_compute_process_def (dflow, bb_info,
- df_get_artificial_defs (df, bb_index), 0);
+ /* Process the artificial defs at the top of the block last since we
+ are going backwards through the block and these are logically at
+ the start. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_rd_bb_local_compute_process_def (bb_info,
+ df_get_artificial_defs (bb_index),
+ DF_REF_AT_TOP);
}
-/* Compute local reaching use (upward exposed use) info for each basic
- block within BLOCKS. */
+/* Compute local reaching def info for each basic block within BLOCKS. */
+
static void
-df_ru_local_compute (struct dataflow *dflow,
- bitmap all_blocks,
- bitmap rescan_blocks ATTRIBUTE_UNUSED)
+df_rd_local_compute (bitmap all_blocks)
{
- struct df *df = dflow->df;
unsigned int bb_index;
bitmap_iterator bi;
unsigned int regno;
- struct df_ru_problem_data *problem_data =
- (struct df_ru_problem_data *) dflow->problem_data;
+ struct df_rd_problem_data *problem_data
+ = (struct df_rd_problem_data *) df_rd->problem_data;
bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
df_set_seen ();
- if (!df->use_info.refs_organized)
- df_reorganize_refs (&df->use_info);
+ df_maybe_reorganize_def_refs (DF_REF_ORDER_BY_REG);
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- df_ru_bb_local_compute (dflow, bb_index);
+ df_rd_bb_local_compute (bb_index);
}
/* Set up the knockout bit vectors to be applied across EH_EDGES. */
EXECUTE_IF_SET_IN_BITMAP (df_invalidated_by_call, 0, regno, bi)
{
- struct df_reg_info *reg_info = DF_REG_USE_GET (df, regno);
- if (reg_info->n_refs > DF_SPARSE_THRESHOLD)
+ if (DF_DEFS_COUNT (regno) > DF_SPARSE_THRESHOLD)
bitmap_set_bit (sparse_invalidated, regno);
else
- {
- bitmap defs = df_ref_bitmap (problem_data->use_sites, regno,
- reg_info->begin, reg_info->n_refs);
- bitmap_ior_into (dense_invalidated, defs);
- }
+ bitmap_set_range (dense_invalidated,
+ DF_DEFS_BEGIN (regno),
+ DF_DEFS_COUNT (regno));
}
-
df_unset_seen ();
}
/* Initialize the solution bit vectors for problem. */
static void
-df_ru_init_solution (struct dataflow *dflow, bitmap all_blocks)
+df_rd_init_solution (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb_index);
- bitmap_copy (bb_info->in, bb_info->gen);
- bitmap_clear (bb_info->out);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
+
+ bitmap_copy (bb_info->out, bb_info->gen);
+ bitmap_clear (bb_info->in);
}
}
-
-/* Out of target gets or of in of source. */
+/* In of target gets or of out of source. */
static void
-df_ru_confluence_n (struct dataflow *dflow, edge e)
+df_rd_confluence_n (edge e)
{
- bitmap op1 = df_ru_get_bb_info (dflow, e->src->index)->out;
- bitmap op2 = df_ru_get_bb_info (dflow, e->dest->index)->in;
+ bitmap op1 = df_rd_get_bb_info (e->dest->index)->in;
+ bitmap op2 = df_rd_get_bb_info (e->src->index)->out;
+
+ if (e->flags & EDGE_FAKE)
+ return;
if (e->flags & EDGE_EH)
{
- struct df_ru_problem_data *problem_data =
- (struct df_ru_problem_data *) dflow->problem_data;
+ struct df_rd_problem_data *problem_data
+ = (struct df_rd_problem_data *) df_rd->problem_data;
bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
- struct df *df = dflow->df;
bitmap_iterator bi;
unsigned int regno;
- bitmap tmp = BITMAP_ALLOC (NULL);
+ bitmap tmp = BITMAP_ALLOC (&df_bitmap_obstack);
bitmap_copy (tmp, op2);
bitmap_and_compl_into (tmp, dense_invalidated);
EXECUTE_IF_SET_IN_BITMAP (sparse_invalidated, 0, regno, bi)
- {
+ {
bitmap_clear_range (tmp,
- DF_REG_USE_GET (df, regno)->begin,
- DF_REG_USE_GET (df, regno)->n_refs);
+ DF_DEFS_BEGIN (regno),
+ DF_DEFS_COUNT (regno));
}
bitmap_ior_into (op1, tmp);
BITMAP_FREE (tmp);
/* Transfer function. */
static bool
-df_ru_transfer_function (struct dataflow *dflow, int bb_index)
+df_rd_transfer_function (int bb_index)
{
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb_index);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
unsigned int regno;
bitmap_iterator bi;
bitmap in = bb_info->in;
bitmap sparse_kill = bb_info->sparse_kill;
if (bitmap_empty_p (sparse_kill))
- return bitmap_ior_and_compl (in, gen, out, kill);
+ return bitmap_ior_and_compl (out, gen, in, kill);
else
{
- struct df *df = dflow->df;
+ struct df_rd_problem_data *problem_data;
bool changed = false;
- bitmap tmp = BITMAP_ALLOC (NULL);
+ bitmap tmp;
+
+ /* Note that TMP is _not_ a temporary bitmap if we end up replacing
+ OUT with TMP. Therefore, allocate TMP in the RD bitmaps obstack. */
+ problem_data = (struct df_rd_problem_data *) df_rd->problem_data;
+ tmp = BITMAP_ALLOC (&problem_data->rd_bitmaps);
+
bitmap_copy (tmp, in);
EXECUTE_IF_SET_IN_BITMAP (sparse_kill, 0, regno, bi)
{
bitmap_clear_range (tmp,
- DF_REG_USE_GET (df, regno)->begin,
- DF_REG_USE_GET (df, regno)->n_refs);
+ DF_DEFS_BEGIN (regno),
+ DF_DEFS_COUNT (regno));
}
bitmap_and_compl_into (tmp, kill);
bitmap_ior_into (tmp, gen);
- changed = !bitmap_equal_p (tmp, in);
+ changed = !bitmap_equal_p (tmp, out);
if (changed)
{
BITMAP_FREE (out);
- bb_info->in = tmp;
+ bb_info->out = tmp;
}
else
- BITMAP_FREE (tmp);
+ BITMAP_FREE (tmp);
return changed;
}
}
/* Free all storage associated with the problem. */
static void
-df_ru_free (struct dataflow *dflow)
+df_rd_free (void)
{
- unsigned int i;
- struct df_ru_problem_data *problem_data =
- (struct df_ru_problem_data *) dflow->problem_data;
+ struct df_rd_problem_data *problem_data
+ = (struct df_rd_problem_data *) df_rd->problem_data;
if (problem_data)
{
- for (i = 0; i < dflow->block_info_size; i++)
- {
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, i);
- if (bb_info)
- {
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->sparse_kill);
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- }
- }
+ free_alloc_pool (df_rd->block_pool);
+ bitmap_obstack_release (&problem_data->rd_bitmaps);
- free_alloc_pool (dflow->block_pool);
-
- for (i = 0; i < problem_data->use_sites_size; i++)
- {
- bitmap bm = problem_data->use_sites[i];
- if (bm)
- BITMAP_FREE (bm);
- }
-
- free (problem_data->use_sites);
- BITMAP_FREE (problem_data->sparse_invalidated_by_call);
- BITMAP_FREE (problem_data->dense_invalidated_by_call);
-
- dflow->block_info_size = 0;
- free (dflow->block_info);
- free (dflow->problem_data);
+ df_rd->block_info_size = 0;
+ free (df_rd->block_info);
+ free (df_rd->problem_data);
}
- free (dflow);
+ free (df_rd);
}
/* Debugging info. */
static void
-df_ru_dump (struct dataflow *dflow, FILE *file)
+df_rd_start_dump (FILE *file)
{
- basic_block bb;
- struct df *df = dflow->df;
- struct df_ru_problem_data *problem_data =
- (struct df_ru_problem_data *) dflow->problem_data;
- unsigned int m = max_reg_num ();
+ struct df_rd_problem_data *problem_data
+ = (struct df_rd_problem_data *) df_rd->problem_data;
+ unsigned int m = DF_REG_SIZE(df);
unsigned int regno;
+
+ if (!df_rd->block_info)
+ return;
- fprintf (file, "Reaching uses:\n");
+ fprintf (file, ";; Reaching defs:\n\n");
fprintf (file, " sparse invalidated \t");
dump_bitmap (file, problem_data->sparse_invalidated_by_call);
fprintf (file, " dense invalidated \t");
dump_bitmap (file, problem_data->dense_invalidated_by_call);
-
+
for (regno = 0; regno < m; regno++)
- if (DF_REG_USE_GET (df, regno)->n_refs)
+ if (DF_DEFS_COUNT (regno))
fprintf (file, "%d[%d,%d] ", regno,
- DF_REG_USE_GET (df, regno)->begin,
- DF_REG_USE_GET (df, regno)->n_refs);
+ DF_DEFS_BEGIN (regno),
+ DF_DEFS_COUNT (regno));
fprintf (file, "\n");
- FOR_ALL_BB (bb)
- {
- struct df_ru_bb_info *bb_info = df_ru_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (! bb_info->in)
- continue;
-
- fprintf (file, " in \t");
- dump_bitmap (file, bb_info->in);
- fprintf (file, " gen \t");
- dump_bitmap (file, bb_info->gen);
- fprintf (file, " kill\t");
- dump_bitmap (file, bb_info->kill);
- fprintf (file, " out \t");
- dump_bitmap (file, bb_info->out);
- }
+}
+
+
+/* Debugging info at top of bb. */
+
+static void
+df_rd_top_dump (basic_block bb, FILE *file)
+{
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb->index);
+ if (!bb_info || !bb_info->in)
+ return;
+
+ fprintf (file, ";; rd in \t(%d)\n", (int) bitmap_count_bits (bb_info->in));
+ dump_bitmap (file, bb_info->in);
+ fprintf (file, ";; rd gen \t(%d)\n", (int) bitmap_count_bits (bb_info->gen));
+ dump_bitmap (file, bb_info->gen);
+ fprintf (file, ";; rd kill\t(%d)\n", (int) bitmap_count_bits (bb_info->kill));
+ dump_bitmap (file, bb_info->kill);
+}
+
+
+/* Debugging info at top of bb. */
+
+static void
+df_rd_bottom_dump (basic_block bb, FILE *file)
+{
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb->index);
+ if (!bb_info || !bb_info->out)
+ return;
+
+ fprintf (file, ";; rd out \t(%d)\n", (int) bitmap_count_bits (bb_info->out));
+ dump_bitmap (file, bb_info->out);
}
/* All of the information associated with every instance of the problem. */
-static struct df_problem problem_RU =
+static struct df_problem problem_RD =
{
- DF_RU, /* Problem id. */
- DF_BACKWARD, /* Direction. */
- df_ru_alloc, /* Allocate the problem specific data. */
+ DF_RD, /* Problem id. */
+ DF_FORWARD, /* Direction. */
+ df_rd_alloc, /* Allocate the problem specific data. */
NULL, /* Reset global information. */
- df_ru_free_bb_info, /* Free basic block info. */
- df_ru_local_compute, /* Local compute function. */
- df_ru_init_solution, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
+ df_rd_free_bb_info, /* Free basic block info. */
+ df_rd_local_compute, /* Local compute function. */
+ df_rd_init_solution, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
NULL, /* Confluence operator 0. */
- df_ru_confluence_n, /* Confluence operator n. */
- df_ru_transfer_function, /* Transfer function. */
+ df_rd_confluence_n, /* Confluence operator n. */
+ df_rd_transfer_function, /* Transfer function. */
NULL, /* Finalize function. */
- df_ru_free, /* Free all of the problem information. */
- df_ru_dump, /* Debugging. */
- NULL /* Dependent problem. */
+ df_rd_free, /* Free all of the problem information. */
+ df_rd_free, /* Remove this problem from the stack of dataflow problems. */
+ df_rd_start_dump, /* Debugging. */
+ df_rd_top_dump, /* Debugging start block. */
+ df_rd_bottom_dump, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ NULL, /* Dependent problem. */
+ TV_DF_RD, /* Timing variable. */
+ true /* Reset blocks on dropping out of blocks_to_analyze. */
};
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_ru_add_problem (struct df *df)
+void
+df_rd_add_problem (void)
{
- return df_add_problem (df, &problem_RU);
+ df_add_problem (&problem_RD);
}
+
\f
/*----------------------------------------------------------------------------
- REACHING DEFINITIONS
+ LIVE REGISTERS
- Find the locations in the function where each definition site for a
- pseudo reaches.
-----------------------------------------------------------------------------*/
+ Find the locations in the function where any use of a pseudo can
+ reach in the backwards direction. In and out bitvectors are built
+ for each basic block. The regno is used to index into these sets.
+ See df.h for details.
+ ----------------------------------------------------------------------------*/
-struct df_rd_problem_data
+/* Private data used to verify the solution for this problem. */
+struct df_lr_problem_data
{
- bitmap *def_sites; /* Bitmap of defs for each pseudo. */
- unsigned int def_sites_size; /* Size of def_sites. */
- /* The set of defs to regs invalidated by call. */
- bitmap sparse_invalidated_by_call;
- /* The set of defs to regs invalidate by call for ru. */
- bitmap dense_invalidated_by_call;
+ bitmap *in;
+ bitmap *out;
};
-/* Get basic block info. */
-
-struct df_rd_bb_info *
-df_rd_get_bb_info (struct dataflow *dflow, unsigned int index)
-{
- return (struct df_rd_bb_info *) dflow->block_info[index];
-}
-
/* Set basic block info. */
static void
-df_rd_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_rd_bb_info *bb_info)
+df_lr_set_bb_info (unsigned int index,
+ struct df_lr_bb_info *bb_info)
{
- dflow->block_info[index] = bb_info;
+ gcc_assert (df_lr);
+ gcc_assert (index < df_lr->block_info_size);
+ df_lr->block_info[index] = bb_info;
}
-
+
/* Free basic block info. */
static void
-df_rd_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
+df_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
- struct df_rd_bb_info *bb_info = (struct df_rd_bb_info *) vbb_info;
+ struct df_lr_bb_info *bb_info = (struct df_lr_bb_info *) vbb_info;
if (bb_info)
{
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->sparse_kill);
- BITMAP_FREE (bb_info->gen);
+ BITMAP_FREE (bb_info->use);
+ BITMAP_FREE (bb_info->def);
BITMAP_FREE (bb_info->in);
BITMAP_FREE (bb_info->out);
- pool_free (dflow->block_pool, bb_info);
+ pool_free (df_lr->block_pool, bb_info);
}
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
+/* Allocate or reset bitmaps for DF_LR blocks. The solution bits are
not touched unless the block is new. */
static void
-df_rd_alloc (struct dataflow *dflow, bitmap blocks_to_rescan)
+df_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
- unsigned int reg_size = max_reg_num ();
- if (! dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_rd_block pool",
- sizeof (struct df_rd_bb_info), 50);
+ if (!df_lr->block_pool)
+ df_lr->block_pool = create_alloc_pool ("df_lr_block pool",
+ sizeof (struct df_lr_bb_info), 50);
- if (dflow->problem_data)
- {
- unsigned int i;
- struct df_rd_problem_data *problem_data =
- (struct df_rd_problem_data *) dflow->problem_data;
+ df_grow_bb_info (df_lr);
- for (i = 0; i < problem_data->def_sites_size; i++)
- {
- bitmap bm = problem_data->def_sites[i];
- if (bm)
- {
- BITMAP_FREE (bm);
- problem_data->def_sites[i] = NULL;
- }
+ EXECUTE_IF_SET_IN_BITMAP (df_lr->out_of_date_transfer_functions, 0, bb_index, bi)
+ {
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
+ if (bb_info)
+ {
+ bitmap_clear (bb_info->def);
+ bitmap_clear (bb_info->use);
}
-
- if (problem_data->def_sites_size < reg_size)
- {
- problem_data->def_sites
- = xrealloc (problem_data->def_sites, reg_size *sizeof (bitmap));
- memset (problem_data->def_sites + problem_data->def_sites_size, 0,
- (reg_size - problem_data->def_sites_size) *sizeof (bitmap));
- problem_data->def_sites_size = reg_size;
+ else
+ {
+ bb_info = (struct df_lr_bb_info *) pool_alloc (df_lr->block_pool);
+ df_lr_set_bb_info (bb_index, bb_info);
+ bb_info->use = BITMAP_ALLOC (NULL);
+ bb_info->def = BITMAP_ALLOC (NULL);
+ bb_info->in = BITMAP_ALLOC (NULL);
+ bb_info->out = BITMAP_ALLOC (NULL);
}
-
- bitmap_clear (problem_data->sparse_invalidated_by_call);
- bitmap_clear (problem_data->dense_invalidated_by_call);
}
- else
- {
- struct df_rd_problem_data *problem_data = XNEW (struct df_rd_problem_data);
- dflow->problem_data = problem_data;
- problem_data->def_sites = XCNEWVEC (bitmap, reg_size);
- problem_data->def_sites_size = reg_size;
- problem_data->sparse_invalidated_by_call = BITMAP_ALLOC (NULL);
- problem_data->dense_invalidated_by_call = BITMAP_ALLOC (NULL);
- }
+ df_lr->optional_p = false;
+}
- df_grow_bb_info (dflow);
- /* Because of the clustering of all def sites for the same pseudo,
- we have to process all of the blocks before doing the
- analysis. */
+/* Reset the global solution for recalculation. */
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_rescan, 0, bb_index, bi)
+static void
+df_lr_reset (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb_index);
- if (bb_info)
- {
- bitmap_clear (bb_info->kill);
- bitmap_clear (bb_info->sparse_kill);
- bitmap_clear (bb_info->gen);
- }
- else
- {
- bb_info = (struct df_rd_bb_info *) pool_alloc (dflow->block_pool);
- df_rd_set_bb_info (dflow, bb_index, bb_info);
- bb_info->kill = BITMAP_ALLOC (NULL);
- bb_info->sparse_kill = BITMAP_ALLOC (NULL);
- bb_info->gen = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
- }
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (bb_info->in);
+ bitmap_clear (bb_info->out);
}
}
-/* Process a list of DEFs for df_rd_bb_local_compute. */
+/* Compute local live register info for basic block BB. */
static void
-df_rd_bb_local_compute_process_def (struct dataflow *dflow,
- struct df_rd_bb_info *bb_info,
- struct df_ref *def,
- enum df_ref_flags top_flag)
+df_lr_bb_local_compute (unsigned int bb_index)
{
- struct df *df = dflow->df;
- while (def)
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
+ rtx insn;
+ struct df_ref **def_rec;
+ struct df_ref **use_rec;
+
+ /* Process the registers set in an exception handler. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
- if (top_flag == (DF_REF_FLAGS (def) & DF_REF_AT_TOP))
+ struct df_ref *def = *def_rec;
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
{
- unsigned int regno = DF_REF_REGNO (def);
- unsigned int begin = DF_REG_DEF_GET (df, regno)->begin;
- unsigned int n_defs = DF_REG_DEF_GET (df, regno)->n_refs;
-
- /* Only the last def(s) for a regno in the block has any
- effect. */
- if (!bitmap_bit_p (seen_in_block, regno))
- {
- /* The first def for regno in insn gets to knock out the
- defs from other instructions. */
- if (!bitmap_bit_p (seen_in_insn, regno))
- {
- if (n_defs > DF_SPARSE_THRESHOLD)
- {
- bitmap_set_bit (bb_info->sparse_kill, regno);
- bitmap_clear_range(bb_info->gen, begin, n_defs);
- }
- else
- {
- struct df_rd_problem_data * problem_data =
- (struct df_rd_problem_data *)dflow->problem_data;
- bitmap defs =
- df_ref_bitmap (problem_data->def_sites, regno,
- begin, n_defs);
- bitmap_ior_into (bb_info->kill, defs);
- bitmap_and_compl_into (bb_info->gen, defs);
- }
- }
-
- bitmap_set_bit (seen_in_insn, regno);
- /* All defs for regno in the instruction may be put into
- the gen set. */
- if (! (DF_REF_FLAGS (def) & DF_REF_CLOBBER))
- bitmap_set_bit (bb_info->gen, DF_REF_ID (def));
- }
+ unsigned int dregno = DF_REF_REGNO (def);
+ bitmap_set_bit (bb_info->def, dregno);
+ bitmap_clear_bit (bb_info->use, dregno);
}
- def = def->next_ref;
}
-}
-
-/* Compute local reaching def info for basic block BB. */
-
-static void
-df_rd_bb_local_compute (struct dataflow *dflow, unsigned int bb_index)
-{
- struct df *df = dflow->df;
- basic_block bb = BASIC_BLOCK (bb_index);
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb_index);
- rtx insn;
- bitmap_clear (seen_in_block);
- bitmap_clear (seen_in_insn);
-
- df_rd_bb_local_compute_process_def (dflow, bb_info,
- df_get_artificial_defs (df, bb_index), 0);
+ /* Process the hardware registers that are always live. */
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
+ }
FOR_BB_INSNS_REVERSE (bb, insn)
{
unsigned int uid = INSN_UID (insn);
- if (! INSN_P (insn))
- continue;
+ if (!INSN_P (insn))
+ continue;
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ bitmap_set_bit (bb_info->def, dregno);
+ bitmap_clear_bit (bb_info->use, dregno);
+ }
+ }
- df_rd_bb_local_compute_process_def (dflow, bb_info,
- DF_INSN_UID_GET (df, uid)->defs, 0);
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
+ }
+ }
- /* This complex dance with the two bitmaps is required because
- instructions can assign twice to the same pseudo. This
- generally happens with calls that will have one def for the
- result and another def for the clobber. If only one vector
- is used and the clobber goes first, the result will be
- lost. */
- bitmap_ior_into (seen_in_block, seen_in_insn);
- bitmap_clear (seen_in_insn);
+ /* Process the registers set in an exception handler or the hard
+ frame pointer if this block is the target of a non local
+ goto. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ bitmap_set_bit (bb_info->def, dregno);
+ bitmap_clear_bit (bb_info->use, dregno);
+ }
+ }
+
+#ifdef EH_USES
+ /* Process the uses that are live into an exception handler. */
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
+ bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
}
+#endif
- /* Process the artificial defs at the top of the block last since we
- are going backwards through the block and these are logically at
- the start. */
- df_rd_bb_local_compute_process_def (dflow, bb_info,
- df_get_artificial_defs (df, bb_index),
- DF_REF_AT_TOP);
+ /* If the df_live problem is not defined, such as at -O0 and -O1, we
+ still need to keep the luids up to date. This is normally done
+ in the df_live problem since this problem has a forwards
+ scan. */
+ if (!df_live)
+ df_recompute_luids (bb);
}
-/* Compute local reaching def info for each basic block within BLOCKS. */
+/* Compute local live register info for each basic block within BLOCKS. */
static void
-df_rd_local_compute (struct dataflow *dflow,
- bitmap all_blocks,
- bitmap rescan_blocks ATTRIBUTE_UNUSED)
+df_lr_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
{
- struct df *df = dflow->df;
unsigned int bb_index;
bitmap_iterator bi;
- unsigned int regno;
- struct df_rd_problem_data *problem_data =
- (struct df_rd_problem_data *) dflow->problem_data;
- bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
- bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
-
- df_set_seen ();
-
- if (!df->def_info.refs_organized)
- df_reorganize_refs (&df->def_info);
-
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+
+ bitmap_clear (df->hardware_regs_used);
+
+ /* The all-important stack pointer must always be live. */
+ bitmap_set_bit (df->hardware_regs_used, STACK_POINTER_REGNUM);
+
+ /* Before reload, there are a few registers that must be forced
+ live everywhere -- which might not already be the case for
+ blocks within infinite loops. */
+ if (!reload_completed)
{
- df_rd_bb_local_compute (dflow, bb_index);
+ /* Any reference to any pseudo before reload is a potential
+ reference of the frame pointer. */
+ bitmap_set_bit (df->hardware_regs_used, FRAME_POINTER_REGNUM);
+
+#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
+ /* Pseudos with argument area equivalences may require
+ reloading via the argument pointer. */
+ if (fixed_regs[ARG_POINTER_REGNUM])
+ bitmap_set_bit (df->hardware_regs_used, ARG_POINTER_REGNUM);
+#endif
+
+ /* Any constant, or pseudo with constant equivalences, may
+ require reloading from memory using the pic register. */
+ if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM
+ && fixed_regs[PIC_OFFSET_TABLE_REGNUM])
+ bitmap_set_bit (df->hardware_regs_used, PIC_OFFSET_TABLE_REGNUM);
}
- /* Set up the knockout bit vectors to be applied across EH_EDGES. */
- EXECUTE_IF_SET_IN_BITMAP (df_invalidated_by_call, 0, regno, bi)
+ EXECUTE_IF_SET_IN_BITMAP (df_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
- struct df_reg_info *reg_info = DF_REG_DEF_GET (df, regno);
- if (reg_info->n_refs > DF_SPARSE_THRESHOLD)
+ if (bb_index == EXIT_BLOCK)
{
- bitmap_set_bit (sparse_invalidated, regno);
+ /* The exit block is special for this problem and its bits are
+ computed from thin air. */
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (EXIT_BLOCK);
+ bitmap_copy (bb_info->use, df->exit_block_uses);
}
else
- {
- bitmap defs = df_ref_bitmap (problem_data->def_sites, regno,
- reg_info->begin, reg_info->n_refs);
- bitmap_ior_into (dense_invalidated, defs);
- }
+ df_lr_bb_local_compute (bb_index);
}
- df_unset_seen ();
+
+ bitmap_clear (df_lr->out_of_date_transfer_functions);
}
-/* Initialize the solution bit vectors for problem. */
+/* Initialize the solution vectors. */
static void
-df_rd_init_solution (struct dataflow *dflow, bitmap all_blocks)
+df_lr_init (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb_index);
-
- bitmap_copy (bb_info->out, bb_info->gen);
- bitmap_clear (bb_info->in);
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
+ bitmap_copy (bb_info->in, bb_info->use);
+ bitmap_clear (bb_info->out);
}
}
-/* In of target gets or of out of source. */
+/* Confluence function that processes infinite loops. This might be a
+ noreturn function that throws. And even if it isn't, getting the
+ unwind info right helps debugging. */
static void
-df_rd_confluence_n (struct dataflow *dflow, edge e)
+df_lr_confluence_0 (basic_block bb)
{
- bitmap op1 = df_rd_get_bb_info (dflow, e->dest->index)->in;
- bitmap op2 = df_rd_get_bb_info (dflow, e->src->index)->out;
+ bitmap op1 = df_lr_get_bb_info (bb->index)->out;
+ if (bb != EXIT_BLOCK_PTR)
+ bitmap_copy (op1, df->hardware_regs_used);
+}
- if (e->flags & EDGE_EH)
- {
- struct df_rd_problem_data *problem_data =
- (struct df_rd_problem_data *) dflow->problem_data;
- bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
- bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
- struct df *df = dflow->df;
- bitmap_iterator bi;
- unsigned int regno;
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_copy (tmp, op2);
- bitmap_and_compl_into (tmp, dense_invalidated);
+/* Confluence function that ignores fake edges. */
- EXECUTE_IF_SET_IN_BITMAP (sparse_invalidated, 0, regno, bi)
- {
- bitmap_clear_range (tmp,
- DF_REG_DEF_GET (df, regno)->begin,
- DF_REG_DEF_GET (df, regno)->n_refs);
- }
- bitmap_ior_into (op1, tmp);
- BITMAP_FREE (tmp);
- }
+static void
+df_lr_confluence_n (edge e)
+{
+ bitmap op1 = df_lr_get_bb_info (e->src->index)->out;
+ bitmap op2 = df_lr_get_bb_info (e->dest->index)->in;
+
+ /* Call-clobbered registers die across exception and call edges. */
+ /* ??? Abnormal call edges ignored for the moment, as this gets
+ confused by sibling call edges, which crashes reg-stack. */
+ if (e->flags & EDGE_EH)
+ bitmap_ior_and_compl_into (op1, op2, df_invalidated_by_call);
else
bitmap_ior_into (op1, op2);
-}
+
+ bitmap_ior_into (op1, df->hardware_regs_used);
+}
/* Transfer function. */
static bool
-df_rd_transfer_function (struct dataflow *dflow, int bb_index)
+df_lr_transfer_function (int bb_index)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb_index);
- unsigned int regno;
- bitmap_iterator bi;
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb_index);
bitmap in = bb_info->in;
bitmap out = bb_info->out;
- bitmap gen = bb_info->gen;
- bitmap kill = bb_info->kill;
- bitmap sparse_kill = bb_info->sparse_kill;
+ bitmap use = bb_info->use;
+ bitmap def = bb_info->def;
- if (bitmap_empty_p (sparse_kill))
- return bitmap_ior_and_compl (out, gen, in, kill);
- else
+ return bitmap_ior_and_compl (in, use, out, def);
+}
+
+
+/* Run the fast dce as a side effect of building LR. */
+
+static void
+df_lr_finalize (bitmap all_blocks ATTRIBUTE_UNUSED)
+{
+ if (df->changeable_flags & DF_LR_RUN_DCE)
{
- struct df *df = dflow->df;
- bool changed = false;
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_copy (tmp, in);
- EXECUTE_IF_SET_IN_BITMAP (sparse_kill, 0, regno, bi)
- {
- bitmap_clear_range (tmp,
- DF_REG_DEF_GET (df, regno)->begin,
- DF_REG_DEF_GET (df, regno)->n_refs);
- }
- bitmap_and_compl_into (tmp, kill);
- bitmap_ior_into (tmp, gen);
- changed = !bitmap_equal_p (tmp, out);
- if (changed)
+ run_fast_df_dce ();
+ if (df_lr->problem_data && df_lr->solutions_dirty)
{
- BITMAP_FREE (out);
- bb_info->out = tmp;
+ /* If we are here, then it is because we are both verifying
+ the solution and the dce changed the function. In that case
+ the verification info built will be wrong. So we leave the
+ dirty flag true so that the verifier will skip the checking
+ part and just clean up.*/
+ df_lr->solutions_dirty = true;
}
- else
- BITMAP_FREE (tmp);
- return changed;
+ else
+ df_lr->solutions_dirty = false;
}
+ else
+ df_lr->solutions_dirty = false;
}
/* Free all storage associated with the problem. */
static void
-df_rd_free (struct dataflow *dflow)
+df_lr_free (void)
{
- unsigned int i;
- struct df_rd_problem_data *problem_data =
- (struct df_rd_problem_data *) dflow->problem_data;
-
- if (problem_data)
+ if (df_lr->block_info)
{
- for (i = 0; i < dflow->block_info_size; i++)
+ unsigned int i;
+ for (i = 0; i < df_lr->block_info_size; i++)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, i);
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (i);
if (bb_info)
{
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->sparse_kill);
- BITMAP_FREE (bb_info->gen);
+ BITMAP_FREE (bb_info->use);
+ BITMAP_FREE (bb_info->def);
BITMAP_FREE (bb_info->in);
BITMAP_FREE (bb_info->out);
}
}
+ free_alloc_pool (df_lr->block_pool);
- free_alloc_pool (dflow->block_pool);
-
- for (i = 0; i < problem_data->def_sites_size; i++)
- {
- bitmap bm = problem_data->def_sites[i];
- if (bm)
- BITMAP_FREE (bm);
- }
-
- free (problem_data->def_sites);
- BITMAP_FREE (problem_data->sparse_invalidated_by_call);
- BITMAP_FREE (problem_data->dense_invalidated_by_call);
-
- dflow->block_info_size = 0;
- free (dflow->block_info);
- free (dflow->problem_data);
+ df_lr->block_info_size = 0;
+ free (df_lr->block_info);
}
- free (dflow);
+
+ BITMAP_FREE (df_lr->out_of_date_transfer_functions);
+ free (df_lr);
}
-/* Debugging info. */
+/* Debugging info at top of bb. */
static void
-df_rd_dump (struct dataflow *dflow, FILE *file)
+df_lr_top_dump (basic_block bb, FILE *file)
{
- struct df *df = dflow->df;
- basic_block bb;
- struct df_rd_problem_data *problem_data =
- (struct df_rd_problem_data *) dflow->problem_data;
- unsigned int m = max_reg_num ();
- unsigned int regno;
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb->index);
+ struct df_lr_problem_data *problem_data;
+ if (!bb_info || !bb_info->in)
+ return;
+
+ fprintf (file, ";; lr in \t");
+ df_print_regset (file, bb_info->in);
+ if (df_lr->problem_data)
+ {
+ problem_data = (struct df_lr_problem_data *)df_lr->problem_data;
+ fprintf (file, ";; old in \t");
+ df_print_regset (file, problem_data->in[bb->index]);
+ }
+ fprintf (file, ";; lr use \t");
+ df_print_regset (file, bb_info->use);
+ fprintf (file, ";; lr def \t");
+ df_print_regset (file, bb_info->def);
+}
+
+
+/* Debugging info at bottom of bb. */
+
+static void
+df_lr_bottom_dump (basic_block bb, FILE *file)
+{
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb->index);
+ struct df_lr_problem_data *problem_data;
+ if (!bb_info || !bb_info->out)
+ return;
- fprintf (file, "Reaching defs:\n\n");
+ fprintf (file, ";; lr out \t");
+ df_print_regset (file, bb_info->out);
+ if (df_lr->problem_data)
+ {
+ problem_data = (struct df_lr_problem_data *)df_lr->problem_data;
+ fprintf (file, ";; old out \t");
+ df_print_regset (file, problem_data->out[bb->index]);
+ }
+}
- fprintf (file, " sparse invalidated \t");
- dump_bitmap (file, problem_data->sparse_invalidated_by_call);
- fprintf (file, " dense invalidated \t");
- dump_bitmap (file, problem_data->dense_invalidated_by_call);
- for (regno = 0; regno < m; regno++)
- if (DF_REG_DEF_GET (df, regno)->n_refs)
- fprintf (file, "%d[%d,%d] ", regno,
- DF_REG_DEF_GET (df, regno)->begin,
- DF_REG_DEF_GET (df, regno)->n_refs);
- fprintf (file, "\n");
+/* Build the datastructure to verify that the solution to the dataflow
+ equations is not dirty. */
+
+static void
+df_lr_verify_solution_start (void)
+{
+ basic_block bb;
+ struct df_lr_problem_data *problem_data;
+ if (df_lr->solutions_dirty)
+ {
+ df_lr->problem_data = NULL;
+ return;
+ }
+
+ /* Set it true so that the solution is recomputed. */
+ df_lr->solutions_dirty = true;
+
+ problem_data = XNEW (struct df_lr_problem_data);
+ df_lr->problem_data = problem_data;
+ problem_data->in = XNEWVEC (bitmap, last_basic_block);
+ problem_data->out = XNEWVEC (bitmap, last_basic_block);
FOR_ALL_BB (bb)
{
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (! bb_info->in)
- continue;
-
- fprintf (file, " in\t(%d)\n", (int) bitmap_count_bits (bb_info->in));
- dump_bitmap (file, bb_info->in);
- fprintf (file, " gen \t(%d)\n", (int) bitmap_count_bits (bb_info->gen));
- dump_bitmap (file, bb_info->gen);
- fprintf (file, " kill\t(%d)\n", (int) bitmap_count_bits (bb_info->kill));
- dump_bitmap (file, bb_info->kill);
- fprintf (file, " out\t(%d)\n", (int) bitmap_count_bits (bb_info->out));
- dump_bitmap (file, bb_info->out);
+ problem_data->in[bb->index] = BITMAP_ALLOC (NULL);
+ problem_data->out[bb->index] = BITMAP_ALLOC (NULL);
+ bitmap_copy (problem_data->in[bb->index], DF_LR_IN (bb));
+ bitmap_copy (problem_data->out[bb->index], DF_LR_OUT (bb));
}
}
-/* All of the information associated with every instance of the problem. */
-static struct df_problem problem_RD =
+/* Compare the saved datastructure and the new solution to the dataflow
+ equations. */
+
+static void
+df_lr_verify_solution_end (void)
{
- DF_RD, /* Problem id. */
- DF_FORWARD, /* Direction. */
- df_rd_alloc, /* Allocate the problem specific data. */
- NULL, /* Reset global information. */
- df_rd_free_bb_info, /* Free basic block info. */
- df_rd_local_compute, /* Local compute function. */
- df_rd_init_solution, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- df_rd_confluence_n, /* Confluence operator n. */
- df_rd_transfer_function, /* Transfer function. */
- NULL, /* Finalize function. */
- df_rd_free, /* Free all of the problem information. */
- df_rd_dump, /* Debugging. */
- NULL /* Dependent problem. */
-};
+ struct df_lr_problem_data *problem_data;
+ basic_block bb;
+
+ if (df_lr->problem_data == NULL)
+ return;
+
+ problem_data = (struct df_lr_problem_data *)df_lr->problem_data;
+
+ if (df_lr->solutions_dirty)
+ /* Do not check if the solution is still dirty. See the comment
+ in df_lr_finalize for details. */
+ df_lr->solutions_dirty = false;
+ else
+ FOR_ALL_BB (bb)
+ {
+ if ((!bitmap_equal_p (problem_data->in[bb->index], DF_LR_IN (bb)))
+ || (!bitmap_equal_p (problem_data->out[bb->index], DF_LR_OUT (bb))))
+ {
+ /*df_dump (stderr);*/
+ gcc_unreachable ();
+ }
+ }
+
+ /* Cannot delete them immediately because you may want to dump them
+ if the comparison fails. */
+ FOR_ALL_BB (bb)
+ {
+ BITMAP_FREE (problem_data->in[bb->index]);
+ BITMAP_FREE (problem_data->out[bb->index]);
+ }
+
+ free (problem_data->in);
+ free (problem_data->out);
+ free (problem_data);
+ df_lr->problem_data = NULL;
+}
+/* All of the information associated with every instance of the problem. */
+
+static struct df_problem problem_LR =
+{
+ DF_LR, /* Problem id. */
+ DF_BACKWARD, /* Direction. */
+ df_lr_alloc, /* Allocate the problem specific data. */
+ df_lr_reset, /* Reset global information. */
+ df_lr_free_bb_info, /* Free basic block info. */
+ df_lr_local_compute, /* Local compute function. */
+ df_lr_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ df_lr_confluence_0, /* Confluence operator 0. */
+ df_lr_confluence_n, /* Confluence operator n. */
+ df_lr_transfer_function, /* Transfer function. */
+ df_lr_finalize, /* Finalize function. */
+ df_lr_free, /* Free all of the problem information. */
+ NULL, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_lr_top_dump, /* Debugging start block. */
+ df_lr_bottom_dump, /* Debugging end block. */
+ df_lr_verify_solution_start,/* Incremental solution verify start. */
+ df_lr_verify_solution_end, /* Incremental solution verify end. */
+ NULL, /* Dependent problem. */
+ TV_DF_LR, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
+};
+
/* Create a new DATAFLOW instance and add it to an existing instance
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_rd_add_problem (struct df *df)
+void
+df_lr_add_problem (void)
+{
+ df_add_problem (&problem_LR);
+ /* These will be initialized when df_scan_blocks processes each
+ block. */
+ df_lr->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
+}
+
+
+/* Verify that all of the lr related info is consistent and
+ correct. */
+
+void
+df_lr_verify_transfer_functions (void)
{
- return df_add_problem (df, &problem_RD);
+ basic_block bb;
+ bitmap saved_def;
+ bitmap saved_use;
+ bitmap saved_adef;
+ bitmap saved_ause;
+ bitmap all_blocks;
+
+ if (!df)
+ return;
+
+ saved_def = BITMAP_ALLOC (NULL);
+ saved_use = BITMAP_ALLOC (NULL);
+ saved_adef = BITMAP_ALLOC (NULL);
+ saved_ause = BITMAP_ALLOC (NULL);
+ all_blocks = BITMAP_ALLOC (NULL);
+
+ FOR_ALL_BB (bb)
+ {
+ struct df_lr_bb_info *bb_info = df_lr_get_bb_info (bb->index);
+ bitmap_set_bit (all_blocks, bb->index);
+
+ if (bb_info)
+ {
+ /* Make a copy of the transfer functions and then compute
+ new ones to see if the transfer functions have
+ changed. */
+ if (!bitmap_bit_p (df_lr->out_of_date_transfer_functions,
+ bb->index))
+ {
+ bitmap_copy (saved_def, bb_info->def);
+ bitmap_copy (saved_use, bb_info->use);
+ bitmap_clear (bb_info->def);
+ bitmap_clear (bb_info->use);
+
+ df_lr_bb_local_compute (bb->index);
+ gcc_assert (bitmap_equal_p (saved_def, bb_info->def));
+ gcc_assert (bitmap_equal_p (saved_use, bb_info->use));
+ }
+ }
+ else
+ {
+ /* If we do not have basic block info, the block must be in
+ the list of dirty blocks or else some one has added a
+ block behind our backs. */
+ gcc_assert (bitmap_bit_p (df_lr->out_of_date_transfer_functions,
+ bb->index));
+ }
+ /* Make sure no one created a block without following
+ procedures. */
+ gcc_assert (df_scan_get_bb_info (bb->index));
+ }
+
+ /* Make sure there are no dirty bits in blocks that have been deleted. */
+ gcc_assert (!bitmap_intersect_compl_p (df_lr->out_of_date_transfer_functions,
+ all_blocks));
+
+ BITMAP_FREE (saved_def);
+ BITMAP_FREE (saved_use);
+ BITMAP_FREE (saved_adef);
+ BITMAP_FREE (saved_ause);
+ BITMAP_FREE (all_blocks);
}
\f
/*----------------------------------------------------------------------------
- LIVE REGISTERS
-
- Find the locations in the function where any use of a pseudo can reach
- in the backwards direction.
+ LIVE AND MUST-INITIALIZED REGISTERS.
+
+ This problem first computes the IN and OUT bitvectors for the
+ must-initialized registers problems, which is a forward problem.
+ It gives the set of registers for which we MUST have an available
+ definition on any path from the entry block to the entry/exit of
+ a basic block. Sets generate a definition, while clobbers kill
+ a definition.
+
+ In and out bitvectors are built for each basic block and are indexed by
+ regnum (see df.h for details). In and out bitvectors in struct
+ df_live_bb_info actually refers to the must-initialized problem;
+
+ Then, the in and out sets for the LIVE problem itself are computed.
+ These are the logical AND of the IN and OUT sets from the LR problem
+ and the must-initialized problem.
----------------------------------------------------------------------------*/
-/* Get basic block info. */
-
-struct df_lr_bb_info *
-df_lr_get_bb_info (struct dataflow *dflow, unsigned int index)
+/* Private data used to verify the solution for this problem. */
+struct df_live_problem_data
{
- return (struct df_lr_bb_info *) dflow->block_info[index];
-}
+ bitmap *in;
+ bitmap *out;
+};
+/* Scratch var used by transfer functions. This is used to implement
+ an optimization to reduce the amount of space used to compute the
+ combined lr and live analysis. */
+static bitmap df_live_scratch;
/* Set basic block info. */
static void
-df_lr_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_lr_bb_info *bb_info)
+df_live_set_bb_info (unsigned int index,
+ struct df_live_bb_info *bb_info)
{
- dflow->block_info[index] = bb_info;
+ gcc_assert (df_live);
+ gcc_assert (index < df_live->block_info_size);
+ df_live->block_info[index] = bb_info;
}
-
+
/* Free basic block info. */
static void
-df_lr_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
+df_live_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
- struct df_lr_bb_info *bb_info = (struct df_lr_bb_info *) vbb_info;
+ struct df_live_bb_info *bb_info = (struct df_live_bb_info *) vbb_info;
if (bb_info)
{
- BITMAP_FREE (bb_info->use);
- BITMAP_FREE (bb_info->def);
+ BITMAP_FREE (bb_info->gen);
+ BITMAP_FREE (bb_info->kill);
BITMAP_FREE (bb_info->in);
BITMAP_FREE (bb_info->out);
- pool_free (dflow->block_pool, bb_info);
+ pool_free (df_live->block_pool, bb_info);
}
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
+/* Allocate or reset bitmaps for DF_LIVE blocks. The solution bits are
not touched unless the block is new. */
static void
-df_lr_alloc (struct dataflow *dflow, bitmap blocks_to_rescan)
+df_live_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
- if (! dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_lr_block pool",
- sizeof (struct df_lr_bb_info), 50);
-
- df_grow_bb_info (dflow);
+ if (!df_live->block_pool)
+ df_live->block_pool = create_alloc_pool ("df_live_block pool",
+ sizeof (struct df_live_bb_info), 100);
+ if (!df_live_scratch)
+ df_live_scratch = BITMAP_ALLOC (NULL);
- /* Because of the clustering of all def sites for the same pseudo,
- we have to process all of the blocks before doing the
- analysis. */
+ df_grow_bb_info (df_live);
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_rescan, 0, bb_index, bi)
+ EXECUTE_IF_SET_IN_BITMAP (df_live->out_of_date_transfer_functions, 0, bb_index, bi)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb_index);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
if (bb_info)
{
- bitmap_clear (bb_info->def);
- bitmap_clear (bb_info->use);
+ bitmap_clear (bb_info->kill);
+ bitmap_clear (bb_info->gen);
}
else
{
- bb_info = (struct df_lr_bb_info *) pool_alloc (dflow->block_pool);
- df_lr_set_bb_info (dflow, bb_index, bb_info);
- bb_info->use = BITMAP_ALLOC (NULL);
- bb_info->def = BITMAP_ALLOC (NULL);
+ bb_info = (struct df_live_bb_info *) pool_alloc (df_live->block_pool);
+ df_live_set_bb_info (bb_index, bb_info);
+ bb_info->kill = BITMAP_ALLOC (NULL);
+ bb_info->gen = BITMAP_ALLOC (NULL);
bb_info->in = BITMAP_ALLOC (NULL);
bb_info->out = BITMAP_ALLOC (NULL);
}
}
+ df_live->optional_p = (optimize <= 1);
}
-/* Compute local live register info for basic block BB. */
+/* Reset the global solution for recalculation. */
+
+static void
+df_live_reset (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (bb_info->in);
+ bitmap_clear (bb_info->out);
+ }
+}
+
+
+/* Compute local uninitialized register info for basic block BB. */
static void
-df_lr_bb_local_compute (struct dataflow *dflow,
- struct df *df, unsigned int bb_index)
+df_live_bb_local_compute (unsigned int bb_index)
{
basic_block bb = BASIC_BLOCK (bb_index);
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb_index);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
rtx insn;
- struct df_ref *def;
- struct df_ref *use;
-
- /* Process the registers set in an exception handler. */
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
- {
- unsigned int dregno = DF_REF_REGNO (def);
- bitmap_set_bit (bb_info->def, dregno);
- bitmap_clear_bit (bb_info->use, dregno);
- }
-
- /* Process the hardware registers that are always live. */
- for (use = df_get_artificial_uses (df, bb_index); use; use = use->next_ref)
- /* Add use to set of uses in this BB. */
- if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
- bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
+ struct df_ref **def_rec;
+ int luid = 0;
- FOR_BB_INSNS_REVERSE (bb, insn)
+ FOR_BB_INSNS (bb, insn)
{
unsigned int uid = INSN_UID (insn);
+ struct df_insn_info *insn_info = DF_INSN_UID_GET (uid);
- if (! INSN_P (insn))
- continue;
-
- if (CALL_P (insn))
+ /* Inserting labels does not always trigger the incremental
+ rescanning. */
+ if (!insn_info)
{
- for (def = DF_INSN_UID_GET (df, uid)->defs; def; def = def->next_ref)
- {
- unsigned int dregno = DF_REF_REGNO (def);
-
- if (dregno >= FIRST_PSEUDO_REGISTER
- || !(SIBLING_CALL_P (insn)
- && bitmap_bit_p (df->exit_block_uses, dregno)
- && !refers_to_regno_p (dregno, dregno+1,
- current_function_return_rtx,
- (rtx *)0)))
- {
- /* Add def to set of defs in this BB. */
- bitmap_set_bit (bb_info->def, dregno);
- bitmap_clear_bit (bb_info->use, dregno);
- }
- }
+ gcc_assert (!INSN_P (insn));
+ insn_info = df_insn_create_insn_record (insn);
}
- else
+
+ DF_INSN_INFO_LUID (insn_info) = luid;
+ if (!INSN_P (insn))
+ continue;
+
+ luid++;
+ for (def_rec = DF_INSN_INFO_DEFS (insn_info); *def_rec; def_rec++)
{
- for (def = DF_INSN_UID_GET (df, uid)->defs; def; def = def->next_ref)
- {
- unsigned int dregno = DF_REF_REGNO (def);
-
- if (DF_INSN_CONTAINS_ASM (df, insn)
- && dregno < FIRST_PSEUDO_REGISTER)
- {
- unsigned int i;
- unsigned int end =
- dregno + hard_regno_nregs[dregno][GET_MODE (DF_REF_REG (def))] - 1;
- for (i = dregno; i <= end; ++i)
- regs_asm_clobbered[i] = 1;
- }
- /* Add def to set of defs in this BB. */
- bitmap_set_bit (bb_info->def, dregno);
- bitmap_clear_bit (bb_info->use, dregno);
- }
- }
+ struct df_ref *def = *def_rec;
+ unsigned int regno = DF_REF_REGNO (def);
- for (use = DF_INSN_UID_GET (df, uid)->uses; use; use = use->next_ref)
- /* Add use to set of uses in this BB. */
- bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
+ if (DF_REF_FLAGS_IS_SET (def,
+ DF_REF_PARTIAL | DF_REF_CONDITIONAL))
+ /* All partial or conditional def
+ seen are included in the gen set. */
+ bitmap_set_bit (bb_info->gen, regno);
+ else if (DF_REF_FLAGS_IS_SET (def, DF_REF_MUST_CLOBBER))
+ /* Only must clobbers for the entire reg destroy the
+ value. */
+ bitmap_set_bit (bb_info->kill, regno);
+ else if (! DF_REF_FLAGS_IS_SET (def, DF_REF_MAY_CLOBBER))
+ bitmap_set_bit (bb_info->gen, regno);
+ }
}
- /* Process the registers set in an exception handler. */
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- {
- unsigned int dregno = DF_REF_REGNO (def);
- bitmap_set_bit (bb_info->def, dregno);
- bitmap_clear_bit (bb_info->use, dregno);
- }
-
-#ifdef EH_USES
- /* Process the uses that are live into an exception handler. */
- for (use = df_get_artificial_uses (df, bb_index); use; use = use->next_ref)
- /* Add use to set of uses in this BB. */
- if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
- bitmap_set_bit (bb_info->use, DF_REF_REGNO (use));
-#endif
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ bitmap_set_bit (bb_info->gen, DF_REF_REGNO (def));
+ }
}
-/* Compute local live register info for each basic block within BLOCKS. */
+
+/* Compute local uninitialized register info. */
static void
-df_lr_local_compute (struct dataflow *dflow,
- bitmap all_blocks,
- bitmap rescan_blocks)
+df_live_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
{
- struct df *df = dflow->df;
unsigned int bb_index;
bitmap_iterator bi;
-
- /* Assume that the stack pointer is unchanging if alloca hasn't
- been used. */
- if (bitmap_equal_p (all_blocks, rescan_blocks))
- memset (regs_asm_clobbered, 0, sizeof (regs_asm_clobbered));
-
- bitmap_clear (df->hardware_regs_used);
-
- /* The all-important stack pointer must always be live. */
- bitmap_set_bit (df->hardware_regs_used, STACK_POINTER_REGNUM);
-
- /* Before reload, there are a few registers that must be forced
- live everywhere -- which might not already be the case for
- blocks within infinite loops. */
- if (! reload_completed)
- {
- /* Any reference to any pseudo before reload is a potential
- reference of the frame pointer. */
- bitmap_set_bit (df->hardware_regs_used, FRAME_POINTER_REGNUM);
-
-#if FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
- /* Pseudos with argument area equivalences may require
- reloading via the argument pointer. */
- if (fixed_regs[ARG_POINTER_REGNUM])
- bitmap_set_bit (df->hardware_regs_used, ARG_POINTER_REGNUM);
-#endif
-
- /* Any constant, or pseudo with constant equivalences, may
- require reloading from memory using the pic register. */
- if ((unsigned) PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM
- && fixed_regs[PIC_OFFSET_TABLE_REGNUM])
- bitmap_set_bit (df->hardware_regs_used, PIC_OFFSET_TABLE_REGNUM);
- }
-
- if (bitmap_bit_p (rescan_blocks, EXIT_BLOCK))
- {
- /* The exit block is special for this problem and its bits are
- computed from thin air. */
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, EXIT_BLOCK);
- bitmap_copy (bb_info->use, df->exit_block_uses);
- }
-
- EXECUTE_IF_SET_IN_BITMAP (rescan_blocks, 0, bb_index, bi)
+
+ df_grow_insn_info ();
+
+ EXECUTE_IF_SET_IN_BITMAP (df_live->out_of_date_transfer_functions,
+ 0, bb_index, bi)
{
- if (bb_index == EXIT_BLOCK)
- continue;
- df_lr_bb_local_compute (dflow, df, bb_index);
+ df_live_bb_local_compute (bb_index);
}
+
+ bitmap_clear (df_live->out_of_date_transfer_functions);
}
/* Initialize the solution vectors. */
static void
-df_lr_init (struct dataflow *dflow, bitmap all_blocks)
+df_live_init (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb_index);
- bitmap_copy (bb_info->in, bb_info->use);
- bitmap_clear (bb_info->out);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
+ struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (bb_index);
+
+ /* No register may reach a location where it is not used. Thus
+ we trim the rr result to the places where it is used. */
+ bitmap_and (bb_info->out, bb_info->gen, bb_lr_info->out);
+ bitmap_clear (bb_info->in);
}
}
+/* Forward confluence function that ignores fake edges. */
-/* Confluence function that processes infinite loops. This might be a
- noreturn function that throws. And even if it isn't, getting the
- unwind info right helps debugging. */
-static void
-df_lr_confluence_0 (struct dataflow *dflow, basic_block bb)
-{
- struct df *df = dflow->df;
-
- bitmap op1 = df_lr_get_bb_info (dflow, bb->index)->out;
- if (bb != EXIT_BLOCK_PTR)
- bitmap_copy (op1, df->hardware_regs_used);
-}
-
-
-/* Confluence function that ignores fake edges. */
static void
-df_lr_confluence_n (struct dataflow *dflow, edge e)
+df_live_confluence_n (edge e)
{
- bitmap op1 = df_lr_get_bb_info (dflow, e->src->index)->out;
- bitmap op2 = df_lr_get_bb_info (dflow, e->dest->index)->in;
+ bitmap op1 = df_live_get_bb_info (e->dest->index)->in;
+ bitmap op2 = df_live_get_bb_info (e->src->index)->out;
- /* Call-clobbered registers die across exception and call edges. */
- /* ??? Abnormal call edges ignored for the moment, as this gets
- confused by sibling call edges, which crashes reg-stack. */
- if (e->flags & EDGE_EH)
- bitmap_ior_and_compl_into (op1, op2, df_invalidated_by_call);
- else
- bitmap_ior_into (op1, op2);
+ if (e->flags & EDGE_FAKE)
+ return;
- bitmap_ior_into (op1, dflow->df->hardware_regs_used);
+ bitmap_ior_into (op1, op2);
}
-/* Transfer function. */
+/* Transfer function for the forwards must-initialized problem. */
+
static bool
-df_lr_transfer_function (struct dataflow *dflow, int bb_index)
+df_live_transfer_function (int bb_index)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb_index);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
+ struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (bb_index);
bitmap in = bb_info->in;
bitmap out = bb_info->out;
- bitmap use = bb_info->use;
- bitmap def = bb_info->def;
+ bitmap gen = bb_info->gen;
+ bitmap kill = bb_info->kill;
- return bitmap_ior_and_compl (in, use, out, def);
+ /* We need to use a scratch set here so that the value returned from
+ this function invocation properly reflects if the sets changed in
+ a significant way; i.e. not just because the lr set was anded
+ in. */
+ bitmap_and (df_live_scratch, gen, bb_lr_info->out);
+ /* No register may reach a location where it is not used. Thus
+ we trim the rr result to the places where it is used. */
+ bitmap_and_into (in, bb_lr_info->in);
+
+ return bitmap_ior_and_compl (out, df_live_scratch, in, kill);
+}
+
+
+/* And the LR info with the must-initialized registers, to produce the LIVE info. */
+
+static void
+df_live_finalize (bitmap all_blocks)
+{
+
+ if (df_live->solutions_dirty)
+ {
+ bitmap_iterator bi;
+ unsigned int bb_index;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (bb_index);
+ struct df_live_bb_info *bb_live_info = df_live_get_bb_info (bb_index);
+
+ /* No register may reach a location where it is not used. Thus
+ we trim the rr result to the places where it is used. */
+ bitmap_and_into (bb_live_info->in, bb_lr_info->in);
+ bitmap_and_into (bb_live_info->out, bb_lr_info->out);
+ }
+
+ df_live->solutions_dirty = false;
+ }
}
/* Free all storage associated with the problem. */
static void
-df_lr_free (struct dataflow *dflow)
+df_live_free (void)
{
- if (dflow->block_info)
+ if (df_live->block_info)
{
unsigned int i;
- for (i = 0; i < dflow->block_info_size; i++)
+
+ for (i = 0; i < df_live->block_info_size; i++)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, i);
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (i);
if (bb_info)
{
- BITMAP_FREE (bb_info->use);
- BITMAP_FREE (bb_info->def);
+ BITMAP_FREE (bb_info->gen);
+ BITMAP_FREE (bb_info->kill);
BITMAP_FREE (bb_info->in);
BITMAP_FREE (bb_info->out);
}
}
- free_alloc_pool (dflow->block_pool);
- dflow->block_info_size = 0;
- free (dflow->block_info);
+ free_alloc_pool (df_live->block_pool);
+ df_live->block_info_size = 0;
+ free (df_live->block_info);
+
+ if (df_live_scratch)
+ BITMAP_FREE (df_live_scratch);
}
- free (dflow);
+ BITMAP_FREE (df_live->out_of_date_transfer_functions);
+ free (df_live);
}
-/* Debugging info. */
+/* Debugging info at top of bb. */
static void
-df_lr_dump (struct dataflow *dflow, FILE *file)
+df_live_top_dump (basic_block bb, FILE *file)
+{
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb->index);
+ struct df_live_problem_data *problem_data;
+
+ if (!bb_info || !bb_info->in)
+ return;
+
+ fprintf (file, ";; live in \t");
+ df_print_regset (file, bb_info->in);
+ if (df_live->problem_data)
+ {
+ problem_data = (struct df_live_problem_data *)df_live->problem_data;
+ fprintf (file, ";; old in \t");
+ df_print_regset (file, problem_data->in[bb->index]);
+ }
+ fprintf (file, ";; live gen \t");
+ df_print_regset (file, bb_info->gen);
+ fprintf (file, ";; live kill\t");
+ df_print_regset (file, bb_info->kill);
+}
+
+
+/* Debugging info at bottom of bb. */
+
+static void
+df_live_bottom_dump (basic_block bb, FILE *file)
+{
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb->index);
+ struct df_live_problem_data *problem_data;
+
+ if (!bb_info || !bb_info->out)
+ return;
+
+ fprintf (file, ";; live out \t");
+ df_print_regset (file, bb_info->out);
+ if (df_live->problem_data)
+ {
+ problem_data = (struct df_live_problem_data *)df_live->problem_data;
+ fprintf (file, ";; old out \t");
+ df_print_regset (file, problem_data->out[bb->index]);
+ }
+}
+
+
+/* Build the datastructure to verify that the solution to the dataflow
+ equations is not dirty. */
+
+static void
+df_live_verify_solution_start (void)
{
basic_block bb;
-
- fprintf (file, "Live Registers:\n");
+ struct df_live_problem_data *problem_data;
+ if (df_live->solutions_dirty)
+ {
+ df_live->problem_data = NULL;
+ return;
+ }
+
+ /* Set it true so that the solution is recomputed. */
+ df_live->solutions_dirty = true;
+
+ problem_data = XNEW (struct df_live_problem_data);
+ df_live->problem_data = problem_data;
+ problem_data->in = XNEWVEC (bitmap, last_basic_block);
+ problem_data->out = XNEWVEC (bitmap, last_basic_block);
+
FOR_ALL_BB (bb)
{
- struct df_lr_bb_info *bb_info = df_lr_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (!bb_info->in)
- continue;
-
- fprintf (file, " in \t");
- dump_bitmap (file, bb_info->in);
- fprintf (file, " use \t");
- dump_bitmap (file, bb_info->use);
- fprintf (file, " def \t");
- dump_bitmap (file, bb_info->def);
- fprintf (file, " out \t");
- dump_bitmap (file, bb_info->out);
+ problem_data->in[bb->index] = BITMAP_ALLOC (NULL);
+ problem_data->out[bb->index] = BITMAP_ALLOC (NULL);
+ bitmap_copy (problem_data->in[bb->index], DF_LIVE_IN (bb));
+ bitmap_copy (problem_data->out[bb->index], DF_LIVE_OUT (bb));
}
}
-/* All of the information associated with every instance of the problem. */
-static struct df_problem problem_LR =
+/* Compare the saved datastructure and the new solution to the dataflow
+ equations. */
+
+static void
+df_live_verify_solution_end (void)
{
- DF_LR, /* Problem id. */
- DF_BACKWARD, /* Direction. */
- df_lr_alloc, /* Allocate the problem specific data. */
- NULL, /* Reset global information. */
- df_lr_free_bb_info, /* Free basic block info. */
- df_lr_local_compute, /* Local compute function. */
- df_lr_init, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
- df_lr_confluence_0, /* Confluence operator 0. */
- df_lr_confluence_n, /* Confluence operator n. */
- df_lr_transfer_function, /* Transfer function. */
- NULL, /* Finalize function. */
- df_lr_free, /* Free all of the problem information. */
- df_lr_dump, /* Debugging. */
- NULL /* Dependent problem. */
+ struct df_live_problem_data *problem_data;
+ basic_block bb;
+
+ if (df_live->problem_data == NULL)
+ return;
+
+ problem_data = (struct df_live_problem_data *)df_live->problem_data;
+
+ FOR_ALL_BB (bb)
+ {
+ if ((!bitmap_equal_p (problem_data->in[bb->index], DF_LIVE_IN (bb)))
+ || (!bitmap_equal_p (problem_data->out[bb->index], DF_LIVE_OUT (bb))))
+ {
+ /*df_dump (stderr);*/
+ gcc_unreachable ();
+ }
+ }
+
+ /* Cannot delete them immediately because you may want to dump them
+ if the comparison fails. */
+ FOR_ALL_BB (bb)
+ {
+ BITMAP_FREE (problem_data->in[bb->index]);
+ BITMAP_FREE (problem_data->out[bb->index]);
+ }
+
+ free (problem_data->in);
+ free (problem_data->out);
+ free (problem_data);
+ df_live->problem_data = NULL;
+}
+
+
+/* All of the information associated with every instance of the problem. */
+
+static struct df_problem problem_LIVE =
+{
+ DF_LIVE, /* Problem id. */
+ DF_FORWARD, /* Direction. */
+ df_live_alloc, /* Allocate the problem specific data. */
+ df_live_reset, /* Reset global information. */
+ df_live_free_bb_info, /* Free basic block info. */
+ df_live_local_compute, /* Local compute function. */
+ df_live_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ NULL, /* Confluence operator 0. */
+ df_live_confluence_n, /* Confluence operator n. */
+ df_live_transfer_function, /* Transfer function. */
+ df_live_finalize, /* Finalize function. */
+ df_live_free, /* Free all of the problem information. */
+ df_live_free, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_live_top_dump, /* Debugging start block. */
+ df_live_bottom_dump, /* Debugging end block. */
+ df_live_verify_solution_start,/* Incremental solution verify start. */
+ df_live_verify_solution_end, /* Incremental solution verify end. */
+ &problem_LR, /* Dependent problem. */
+ TV_DF_LIVE, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
};
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_lr_add_problem (struct df *df)
+void
+df_live_add_problem (void)
{
- return df_add_problem (df, &problem_LR);
+ df_add_problem (&problem_LIVE);
+ /* These will be initialized when df_scan_blocks processes each
+ block. */
+ df_live->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
}
+/* Set all of the blocks as dirty. This needs to be done if this
+ problem is added after all of the insns have been scanned. */
+
+void
+df_live_set_all_dirty (void)
+{
+ basic_block bb;
+ FOR_ALL_BB (bb)
+ bitmap_set_bit (df_live->out_of_date_transfer_functions,
+ bb->index);
+}
+
+
+/* Verify that all of the lr related info is consistent and
+ correct. */
+
+void
+df_live_verify_transfer_functions (void)
+{
+ basic_block bb;
+ bitmap saved_gen;
+ bitmap saved_kill;
+ bitmap all_blocks;
+
+ if (!df)
+ return;
+
+ saved_gen = BITMAP_ALLOC (NULL);
+ saved_kill = BITMAP_ALLOC (NULL);
+ all_blocks = BITMAP_ALLOC (NULL);
+
+ df_grow_insn_info ();
+
+ FOR_ALL_BB (bb)
+ {
+ struct df_live_bb_info *bb_info = df_live_get_bb_info (bb->index);
+ bitmap_set_bit (all_blocks, bb->index);
+
+ if (bb_info)
+ {
+ /* Make a copy of the transfer functions and then compute
+ new ones to see if the transfer functions have
+ changed. */
+ if (!bitmap_bit_p (df_live->out_of_date_transfer_functions,
+ bb->index))
+ {
+ bitmap_copy (saved_gen, bb_info->gen);
+ bitmap_copy (saved_kill, bb_info->kill);
+ bitmap_clear (bb_info->gen);
+ bitmap_clear (bb_info->kill);
+
+ df_live_bb_local_compute (bb->index);
+ gcc_assert (bitmap_equal_p (saved_gen, bb_info->gen));
+ gcc_assert (bitmap_equal_p (saved_kill, bb_info->kill));
+ }
+ }
+ else
+ {
+ /* If we do not have basic block info, the block must be in
+ the list of dirty blocks or else some one has added a
+ block behind our backs. */
+ gcc_assert (bitmap_bit_p (df_live->out_of_date_transfer_functions,
+ bb->index));
+ }
+ /* Make sure no one created a block without following
+ procedures. */
+ gcc_assert (df_scan_get_bb_info (bb->index));
+ }
+
+ /* Make sure there are no dirty bits in blocks that have been deleted. */
+ gcc_assert (!bitmap_intersect_compl_p (df_live->out_of_date_transfer_functions,
+ all_blocks));
+ BITMAP_FREE (saved_gen);
+ BITMAP_FREE (saved_kill);
+ BITMAP_FREE (all_blocks);
+}
\f
/*----------------------------------------------------------------------------
- UNINITIALIZED REGISTERS
+ CREATE DEF_USE (DU) and / or USE_DEF (UD) CHAINS
+
+ Link either the defs to the uses and / or the uses to the defs.
- Find the set of uses for registers that are reachable from the entry
- block without passing thru a definition.
+ These problems are set up like the other dataflow problems so that
+ they nicely fit into the framework. They are much simpler and only
+ involve a single traversal of instructions and an examination of
+ the reaching defs information (the dependent problem).
----------------------------------------------------------------------------*/
-/* Get basic block info. */
+#define df_chain_problem_p(FLAG) (((enum df_chain_flags)df_chain->local_flags)&(FLAG))
-struct df_ur_bb_info *
-df_ur_get_bb_info (struct dataflow *dflow, unsigned int index)
+/* Create a du or ud chain from SRC to DST and link it into SRC. */
+
+struct df_link *
+df_chain_create (struct df_ref *src, struct df_ref *dst)
{
- return (struct df_ur_bb_info *) dflow->block_info[index];
+ struct df_link *head = DF_REF_CHAIN (src);
+ struct df_link *link = (struct df_link *) pool_alloc (df_chain->block_pool);
+
+ DF_REF_CHAIN (src) = link;
+ link->next = head;
+ link->ref = dst;
+ return link;
}
-/* Set basic block info. */
-
+/* Delete any du or ud chains that start at REF and point to
+ TARGET. */
static void
-df_ur_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_ur_bb_info *bb_info)
+df_chain_unlink_1 (struct df_ref *ref, struct df_ref *target)
{
- dflow->block_info[index] = bb_info;
+ struct df_link *chain = DF_REF_CHAIN (ref);
+ struct df_link *prev = NULL;
+
+ while (chain)
+ {
+ if (chain->ref == target)
+ {
+ if (prev)
+ prev->next = chain->next;
+ else
+ DF_REF_CHAIN (ref) = chain->next;
+ pool_free (df_chain->block_pool, chain);
+ return;
+ }
+ prev = chain;
+ chain = chain->next;
+ }
}
-/* Free basic block info. */
+/* Delete a du or ud chain that leave or point to REF. */
-static void
-df_ur_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
- void *vbb_info)
+void
+df_chain_unlink (struct df_ref *ref)
{
- struct df_ur_bb_info *bb_info = (struct df_ur_bb_info *) vbb_info;
- if (bb_info)
+ struct df_link *chain = DF_REF_CHAIN (ref);
+ while (chain)
{
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- pool_free (dflow->block_pool, bb_info);
+ struct df_link *next = chain->next;
+ /* Delete the other side if it exists. */
+ df_chain_unlink_1 (chain->ref, ref);
+ pool_free (df_chain->block_pool, chain);
+ chain = next;
}
+ DF_REF_CHAIN (ref) = NULL;
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
- not touched unless the block is new. */
+/* Copy the du or ud chain starting at FROM_REF and attach it to
+ TO_REF. */
-static void
-df_ur_alloc (struct dataflow *dflow, bitmap blocks_to_rescan)
+void
+df_chain_copy (struct df_ref *to_ref,
+ struct df_link *from_ref)
{
- unsigned int bb_index;
- bitmap_iterator bi;
+ while (from_ref)
+ {
+ df_chain_create (to_ref, from_ref->ref);
+ from_ref = from_ref->next;
+ }
+}
- if (! dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_ur_block pool",
- sizeof (struct df_ur_bb_info), 100);
- df_grow_bb_info (dflow);
+/* Remove this problem from the stack of dataflow problems. */
- /* Because of the clustering of all def sites for the same pseudo,
- we have to process all of the blocks before doing the
- analysis. */
+static void
+df_chain_remove_problem (void)
+{
+ bitmap_iterator bi;
+ unsigned int bb_index;
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_rescan, 0, bb_index, bi)
- {
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- if (bb_info)
- {
- bitmap_clear (bb_info->kill);
- bitmap_clear (bb_info->gen);
- }
- else
- {
- bb_info = (struct df_ur_bb_info *) pool_alloc (dflow->block_pool);
- df_ur_set_bb_info (dflow, bb_index, bb_info);
- bb_info->kill = BITMAP_ALLOC (NULL);
- bb_info->gen = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
+ /* Wholesale destruction of the old chains. */
+ if (df_chain->block_pool)
+ free_alloc_pool (df_chain->block_pool);
+
+ EXECUTE_IF_SET_IN_BITMAP (df_chain->out_of_date_transfer_functions, 0, bb_index, bi)
+ {
+ rtx insn;
+ struct df_ref **def_rec;
+ struct df_ref **use_rec;
+ basic_block bb = BASIC_BLOCK (bb_index);
+
+ if (df_chain_problem_p (DF_DU_CHAIN))
+ for (def_rec = df_get_artificial_defs (bb->index); *def_rec; def_rec++)
+ DF_REF_CHAIN (*def_rec) = NULL;
+ if (df_chain_problem_p (DF_UD_CHAIN))
+ for (use_rec = df_get_artificial_uses (bb->index); *use_rec; use_rec++)
+ DF_REF_CHAIN (*use_rec) = NULL;
+
+ FOR_BB_INSNS (bb, insn)
+ {
+ unsigned int uid = INSN_UID (insn);
+
+ if (INSN_P (insn))
+ {
+ if (df_chain_problem_p (DF_DU_CHAIN))
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ DF_REF_CHAIN (*def_rec) = NULL;
+ if (df_chain_problem_p (DF_UD_CHAIN))
+ {
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+ DF_REF_CHAIN (*use_rec) = NULL;
+ for (use_rec = DF_INSN_UID_EQ_USES (uid); *use_rec; use_rec++)
+ DF_REF_CHAIN (*use_rec) = NULL;
+ }
+ }
}
}
+
+ bitmap_clear (df_chain->out_of_date_transfer_functions);
+ df_chain->block_pool = NULL;
}
-/* Compute local uninitialized register info for basic block BB. */
+/* Remove the chain problem completely. */
static void
-df_ur_bb_local_compute (struct dataflow *dflow, unsigned int bb_index)
+df_chain_fully_remove_problem (void)
{
- struct df *df = dflow->df;
- basic_block bb = BASIC_BLOCK (bb_index);
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- rtx insn;
- struct df_ref *def;
+ df_chain_remove_problem ();
+ BITMAP_FREE (df_chain->out_of_date_transfer_functions);
+ free (df_chain);
+}
- bitmap_clear (seen_in_block);
- bitmap_clear (seen_in_insn);
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
- {
- unsigned int regno = DF_REF_REGNO (def);
- if (!bitmap_bit_p (seen_in_block, regno))
- {
- bitmap_set_bit (seen_in_block, regno);
- bitmap_set_bit (bb_info->gen, regno);
- }
- }
+/* Create def-use or use-def chains. */
+
+static void
+df_chain_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
+{
+ df_chain_remove_problem ();
+ df_chain->block_pool = create_alloc_pool ("df_chain_block pool",
+ sizeof (struct df_link), 50);
+ df_chain->optional_p = true;
+}
- FOR_BB_INSNS_REVERSE (bb, insn)
- {
- unsigned int uid = INSN_UID (insn);
- if (!INSN_P (insn))
- continue;
- for (def = DF_INSN_UID_GET (df, uid)->defs; def; def = def->next_ref)
+/* Reset all of the chains when the set of basic blocks changes. */
+
+static void
+df_chain_reset (bitmap blocks_to_clear ATTRIBUTE_UNUSED)
+{
+ df_chain_remove_problem ();
+}
+
+
+/* Create the chains for a list of USEs. */
+
+static void
+df_chain_create_bb_process_use (bitmap local_rd,
+ struct df_ref **use_rec,
+ enum df_ref_flags top_flag)
+{
+ bitmap_iterator bi;
+ unsigned int def_index;
+
+ while (*use_rec)
+ {
+ struct df_ref *use = *use_rec;
+ unsigned int uregno = DF_REF_REGNO (use);
+ if ((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (uregno >= FIRST_PSEUDO_REGISTER))
{
- unsigned int regno = DF_REF_REGNO (def);
- /* Only the last def counts. */
- if (!bitmap_bit_p (seen_in_block, regno))
+ /* Do not want to go through this for an uninitialized var. */
+ int count = DF_DEFS_COUNT (uregno);
+ if (count)
{
- bitmap_set_bit (seen_in_insn, regno);
-
- if (DF_REF_FLAGS (def) & DF_REF_CLOBBER)
- bitmap_set_bit (bb_info->kill, regno);
- else
- bitmap_set_bit (bb_info->gen, regno);
+ if (top_flag == (DF_REF_FLAGS (use) & DF_REF_AT_TOP))
+ {
+ unsigned int first_index = DF_DEFS_BEGIN (uregno);
+ unsigned int last_index = first_index + count - 1;
+
+ EXECUTE_IF_SET_IN_BITMAP (local_rd, first_index, def_index, bi)
+ {
+ struct df_ref *def;
+ if (def_index > last_index)
+ break;
+
+ def = DF_DEFS_GET (def_index);
+ if (df_chain_problem_p (DF_DU_CHAIN))
+ df_chain_create (def, use);
+ if (df_chain_problem_p (DF_UD_CHAIN))
+ df_chain_create (use, def);
+ }
+ }
}
}
- bitmap_ior_into (seen_in_block, seen_in_insn);
- bitmap_clear (seen_in_insn);
- }
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- {
- unsigned int regno = DF_REF_REGNO (def);
- if (!bitmap_bit_p (seen_in_block, regno))
- {
- bitmap_set_bit (seen_in_block, regno);
- bitmap_set_bit (bb_info->gen, regno);
- }
- }
+ use_rec++;
+ }
}
-/* Compute local uninitialized register info. */
+/* Create chains from reaching defs bitmaps for basic block BB. */
static void
-df_ur_local_compute (struct dataflow *dflow,
- bitmap all_blocks ATTRIBUTE_UNUSED,
- bitmap rescan_blocks)
+df_chain_create_bb (unsigned int bb_index)
{
- unsigned int bb_index;
- bitmap_iterator bi;
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_rd_bb_info *bb_info = df_rd_get_bb_info (bb_index);
+ rtx insn;
+ bitmap cpy = BITMAP_ALLOC (NULL);
+ struct df_ref **def_rec;
- df_set_seen ();
+ bitmap_copy (cpy, bb_info->in);
+ bitmap_set_bit (df_chain->out_of_date_transfer_functions, bb_index);
+
+ /* Since we are going forwards, process the artificial uses first
+ then the artificial defs second. */
+
+#ifdef EH_USES
+ /* Create the chains for the artificial uses from the EH_USES at the
+ beginning of the block. */
+
+ /* Artificials are only hard regs. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_chain_create_bb_process_use (cpy,
+ df_get_artificial_uses (bb->index),
+ DF_REF_AT_TOP);
+#endif
- EXECUTE_IF_SET_IN_BITMAP (rescan_blocks, 0, bb_index, bi)
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
- df_ur_bb_local_compute (dflow, bb_index);
+ struct df_ref *def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ bitmap_clear_range (cpy,
+ DF_DEFS_BEGIN (dregno),
+ DF_DEFS_COUNT (dregno));
+ bitmap_set_bit (cpy, DF_REF_ID (def));
+ }
}
+
+ /* Process the regular instructions next. */
+ FOR_BB_INSNS (bb, insn)
+ {
+ struct df_ref **def_rec;
+ unsigned int uid = INSN_UID (insn);
- df_unset_seen ();
-}
+ if (!INSN_P (insn))
+ continue;
+
+ /* Now scan the uses and link them up with the defs that remain
+ in the cpy vector. */
+
+ df_chain_create_bb_process_use (cpy, DF_INSN_UID_USES (uid), 0);
+ if (df->changeable_flags & DF_EQ_NOTES)
+ df_chain_create_bb_process_use (cpy, DF_INSN_UID_EQ_USES (uid), 0);
-/* Initialize the solution vectors. */
-static void
-df_ur_init (struct dataflow *dflow, bitmap all_blocks)
-{
- unsigned int bb_index;
- bitmap_iterator bi;
+ /* Since we are going forwards, process the defs second. This
+ pass only changes the bits in cpy. */
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+ if ((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (dregno >= FIRST_PSEUDO_REGISTER))
+ {
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ bitmap_clear_range (cpy,
+ DF_DEFS_BEGIN (dregno),
+ DF_DEFS_COUNT (dregno));
+ if (!(DF_REF_FLAGS (def)
+ & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
+ bitmap_set_bit (cpy, DF_REF_ID (def));
+ }
+ }
+ }
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
- {
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
+ /* Create the chains for the artificial uses of the hard registers
+ at the end of the block. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_chain_create_bb_process_use (cpy,
+ df_get_artificial_uses (bb->index),
+ 0);
- bitmap_copy (bb_info->out, bb_info->gen);
- bitmap_clear (bb_info->in);
- }
+ BITMAP_FREE (cpy);
}
-
-/* Or in the stack regs, hard regs and early clobber regs into the the
- ur_in sets of all of the blocks. */
+/* Create def-use chains from reaching use bitmaps for basic blocks
+ in BLOCKS. */
static void
-df_ur_local_finalize (struct dataflow *dflow, bitmap all_blocks)
+df_chain_finalize (bitmap all_blocks)
{
- struct df *df = dflow->df;
- struct dataflow *lr_dflow = df->problems_by_index[DF_LR];
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_iterator bi;
unsigned int bb_index;
-
+ bitmap_iterator bi;
+
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (lr_dflow, bb_index);
-
- /* No register may reach a location where it is not used. Thus
- we trim the rr result to the places where it is used. */
- bitmap_and_into (bb_info->in, bb_lr_info->in);
- bitmap_and_into (bb_info->out, bb_lr_info->out);
-
-#if 1
- /* Hard registers may still stick in the ur_out set, but not
- be in the ur_in set, if their only mention was in a call
- in this block. This is because a call kills in the lr
- problem but does not kill in the ur problem. To clean
- this up, we execute the transfer function on the lr_in
- set and then use that to knock bits out of ur_out. */
- bitmap_ior_and_compl (tmp, bb_info->gen, bb_lr_info->in,
- bb_info->kill);
- bitmap_and_into (bb_info->out, tmp);
-#endif
+ df_chain_create_bb (bb_index);
}
-
- BITMAP_FREE (tmp);
}
-/* Confluence function that ignores fake edges. */
+/* Free all storage associated with the problem. */
static void
-df_ur_confluence_n (struct dataflow *dflow, edge e)
-{
- bitmap op1 = df_ur_get_bb_info (dflow, e->dest->index)->in;
- bitmap op2 = df_ur_get_bb_info (dflow, e->src->index)->out;
-
- if (e->flags & EDGE_FAKE)
- return;
-
- bitmap_ior_into (op1, op2);
-}
-
-
-/* Transfer function. */
-
-static bool
-df_ur_transfer_function (struct dataflow *dflow, int bb_index)
+df_chain_free (void)
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- bitmap in = bb_info->in;
- bitmap out = bb_info->out;
- bitmap gen = bb_info->gen;
- bitmap kill = bb_info->kill;
-
- return bitmap_ior_and_compl (out, gen, in, kill);
+ free_alloc_pool (df_chain->block_pool);
+ BITMAP_FREE (df_chain->out_of_date_transfer_functions);
+ free (df_chain);
}
-/* Free all storage associated with the problem. */
+/* Debugging info. */
static void
-df_ur_free (struct dataflow *dflow)
+df_chain_top_dump (basic_block bb, FILE *file)
{
- if (dflow->block_info)
+ if (df_chain_problem_p (DF_DU_CHAIN))
{
- unsigned int i;
-
- for (i = 0; i < dflow->block_info_size; i++)
+ rtx insn;
+ struct df_ref **def_rec = df_get_artificial_defs (bb->index);
+ if (*def_rec)
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, i);
- if (bb_info)
+
+ fprintf (file, ";; DU chains for artificial defs\n");
+ while (*def_rec)
{
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
+ struct df_ref *def = *def_rec;
+ fprintf (file, ";; reg %d ", DF_REF_REGNO (def));
+ df_chain_dump (DF_REF_CHAIN (def), file);
+ fprintf (file, "\n");
+ def_rec++;
+ }
+ }
+
+ FOR_BB_INSNS (bb, insn)
+ {
+ if (INSN_P (insn))
+ {
+ struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
+ def_rec = DF_INSN_INFO_DEFS (insn_info);
+ if (*def_rec)
+ {
+ fprintf (file, ";; DU chains for insn luid %d uid %d\n",
+ DF_INSN_INFO_LUID (insn_info), INSN_UID (insn));
+
+ while (*def_rec)
+ {
+ struct df_ref *def = *def_rec;
+ fprintf (file, ";; reg %d ", DF_REF_REGNO (def));
+ if (def->flags & DF_REF_READ_WRITE)
+ fprintf (file, "read/write ");
+ df_chain_dump (DF_REF_CHAIN (def), file);
+ fprintf (file, "\n");
+ def_rec++;
+ }
+ }
}
}
-
- free_alloc_pool (dflow->block_pool);
- dflow->block_info_size = 0;
- free (dflow->block_info);
}
- free (dflow);
}
-/* Debugging info. */
-
static void
-df_ur_dump (struct dataflow *dflow, FILE *file)
+df_chain_bottom_dump (basic_block bb, FILE *file)
{
- basic_block bb;
-
- fprintf (file, "Undefined regs:\n");
-
- FOR_ALL_BB (bb)
+ if (df_chain_problem_p (DF_UD_CHAIN))
{
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (! bb_info->in)
- continue;
-
- fprintf (file, " in \t");
- dump_bitmap (file, bb_info->in);
- fprintf (file, " gen \t");
- dump_bitmap (file, bb_info->gen);
- fprintf (file, " kill\t");
- dump_bitmap (file, bb_info->kill);
- fprintf (file, " out \t");
- dump_bitmap (file, bb_info->out);
+ rtx insn;
+ struct df_ref **use_rec = df_get_artificial_uses (bb->index);
+
+ if (*use_rec)
+ {
+ fprintf (file, ";; UD chains for artificial uses\n");
+ while (*use_rec)
+ {
+ struct df_ref *use = *use_rec;
+ fprintf (file, ";; reg %d ", DF_REF_REGNO (use));
+ df_chain_dump (DF_REF_CHAIN (use), file);
+ fprintf (file, "\n");
+ use_rec++;
+ }
+ }
+
+ FOR_BB_INSNS (bb, insn)
+ {
+ if (INSN_P (insn))
+ {
+ struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
+ struct df_ref **eq_use_rec = DF_INSN_INFO_EQ_USES (insn_info);
+ use_rec = DF_INSN_INFO_USES (insn_info);
+ if (*use_rec || *eq_use_rec)
+ {
+ fprintf (file, ";; UD chains for insn luid %d uid %d\n",
+ DF_INSN_INFO_LUID (insn_info), INSN_UID (insn));
+
+ while (*use_rec)
+ {
+ struct df_ref *use = *use_rec;
+ fprintf (file, ";; reg %d ", DF_REF_REGNO (use));
+ if (use->flags & DF_REF_READ_WRITE)
+ fprintf (file, "read/write ");
+ df_chain_dump (DF_REF_CHAIN (use), file);
+ fprintf (file, "\n");
+ use_rec++;
+ }
+ while (*eq_use_rec)
+ {
+ struct df_ref *use = *eq_use_rec;
+ fprintf (file, ";; eq_note reg %d ", DF_REF_REGNO (use));
+ df_chain_dump (DF_REF_CHAIN (use), file);
+ fprintf (file, "\n");
+ eq_use_rec++;
+ }
+ }
+ }
+ }
}
}
-/* All of the information associated with every instance of the problem. */
-static struct df_problem problem_UR =
+static struct df_problem problem_CHAIN =
{
- DF_UR, /* Problem id. */
- DF_FORWARD, /* Direction. */
- df_ur_alloc, /* Allocate the problem specific data. */
- NULL, /* Reset global information. */
- df_ur_free_bb_info, /* Free basic block info. */
- df_ur_local_compute, /* Local compute function. */
- df_ur_init, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
+ DF_CHAIN, /* Problem id. */
+ DF_NONE, /* Direction. */
+ df_chain_alloc, /* Allocate the problem specific data. */
+ df_chain_reset, /* Reset global information. */
+ NULL, /* Free basic block info. */
+ NULL, /* Local compute function. */
+ NULL, /* Init the solution specific data. */
+ NULL, /* Iterative solver. */
NULL, /* Confluence operator 0. */
- df_ur_confluence_n, /* Confluence operator n. */
- df_ur_transfer_function, /* Transfer function. */
- df_ur_local_finalize, /* Finalize function. */
- df_ur_free, /* Free all of the problem information. */
- df_ur_dump, /* Debugging. */
- &problem_LR /* Dependent problem. */
+ NULL, /* Confluence operator n. */
+ NULL, /* Transfer function. */
+ df_chain_finalize, /* Finalize function. */
+ df_chain_free, /* Free all of the problem information. */
+ df_chain_fully_remove_problem,/* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_chain_top_dump, /* Debugging start block. */
+ df_chain_bottom_dump, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ &problem_RD, /* Dependent problem. */
+ TV_DF_CHAIN, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
};
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_ur_add_problem (struct df *df)
+void
+df_chain_add_problem (enum df_chain_flags chain_flags)
{
- return df_add_problem (df, &problem_UR);
+ df_add_problem (&problem_CHAIN);
+ df_chain->local_flags = (unsigned int)chain_flags;
+ df_chain->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
}
+#undef df_chain_problem_p
\f
/*----------------------------------------------------------------------------
- UNINITIALIZED REGISTERS WITH EARLYCLOBBER
+ BYTE LEVEL LIVE REGISTERS
+
+ Find the locations in the function where any use of a pseudo can
+ reach in the backwards direction. In and out bitvectors are built
+ for each basic block. There are two mapping functions,
+ df_byte_lr_get_regno_start and df_byte_lr_get_regno_len that are
+ used to map regnos into bit vector positions.
+
+ This problem differs from the regular df_lr function in the way
+ that subregs, *_extracts and strict_low_parts are handled. In lr
+ these are consider partial kills, here, the exact set of bytes is
+ modeled. Note that any reg that has none of these operations is
+ only modeled with a single bit since all operations access the
+ entire register.
+
+ This problem is more brittle that the regular lr. It currently can
+ be used in dce incrementally, but cannot be used in an environment
+ where insns are created or modified. The problem is that the
+ mapping of regnos to bitmap positions is relatively compact, in
+ that if a pseudo does not do any of the byte wise operations, only
+ one slot is allocated, rather than a slot for each byte. If insn
+ are created, where a subreg is used for a reg that had no subregs,
+ the mapping would be wrong. Likewise, there are no checks to see
+ that new pseudos have been added. These issues could be addressed
+ by adding a problem specific flag to not use the compact mapping,
+ if there was a need to do so.
+
+ ----------------------------------------------------------------------------*/
+
+/* Private data used to verify the solution for this problem. */
+struct df_byte_lr_problem_data
+{
+ /* Expanded versions of bitvectors used in lr. */
+ bitmap invalidated_by_call;
+ bitmap hardware_regs_used;
+
+ /* Indexed by regno, this is true if there are subregs, extracts or
+ strict_low_parts for this regno. */
+ bitmap needs_expansion;
+
+ /* The start position and len for each regno in the various bit
+ vectors. */
+ unsigned int* regno_start;
+ unsigned int* regno_len;
+ /* An obstack for the bitmaps we need for this problem. */
+ bitmap_obstack byte_lr_bitmaps;
+};
- Find the set of uses for registers that are reachable from the entry
- block without passing thru a definition.
- This is a variant of the UR problem above that has a lot of special
- features just for the register allocation phase.
-----------------------------------------------------------------------------*/
+/* Get the starting location for REGNO in the df_byte_lr bitmaps. */
-struct df_urec_problem_data
+int
+df_byte_lr_get_regno_start (unsigned int regno)
{
- bool earlyclobbers_found; /* True if any instruction contains an
- earlyclobber. */
-#ifdef STACK_REGS
- bitmap stack_regs; /* Registers that may be allocated to a STACK_REGS. */
-#endif
-};
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;;
+ return problem_data->regno_start[regno];
+}
-/* Get basic block info. */
+/* Get the len for REGNO in the df_byte_lr bitmaps. */
-struct df_urec_bb_info *
-df_urec_get_bb_info (struct dataflow *dflow, unsigned int index)
-{
- return (struct df_urec_bb_info *) dflow->block_info[index];
+int
+df_byte_lr_get_regno_len (unsigned int regno)
+{
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;;
+ return problem_data->regno_len[regno];
}
/* Set basic block info. */
static void
-df_urec_set_bb_info (struct dataflow *dflow, unsigned int index,
- struct df_urec_bb_info *bb_info)
+df_byte_lr_set_bb_info (unsigned int index,
+ struct df_byte_lr_bb_info *bb_info)
{
- dflow->block_info[index] = bb_info;
+ gcc_assert (df_byte_lr);
+ gcc_assert (index < df_byte_lr->block_info_size);
+ df_byte_lr->block_info[index] = bb_info;
}
-
+
/* Free basic block info. */
static void
-df_urec_free_bb_info (struct dataflow *dflow,
- basic_block bb ATTRIBUTE_UNUSED,
- void *vbb_info)
+df_byte_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
+ void *vbb_info)
{
- struct df_urec_bb_info *bb_info = (struct df_urec_bb_info *) vbb_info;
+ struct df_byte_lr_bb_info *bb_info = (struct df_byte_lr_bb_info *) vbb_info;
if (bb_info)
{
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->kill);
+ BITMAP_FREE (bb_info->use);
+ BITMAP_FREE (bb_info->def);
BITMAP_FREE (bb_info->in);
BITMAP_FREE (bb_info->out);
- BITMAP_FREE (bb_info->earlyclobber);
- pool_free (dflow->block_pool, bb_info);
+ pool_free (df_byte_lr->block_pool, bb_info);
}
}
-/* Allocate or reset bitmaps for DFLOW blocks. The solution bits are
- not touched unless the block is new. */
+/* Check all of the refs in REF_REC to see if any of them are
+ extracts, subregs or strict_low_parts. */
-static void
-df_urec_alloc (struct dataflow *dflow, bitmap blocks_to_rescan)
+static void
+df_byte_lr_check_regs (struct df_ref **ref_rec)
{
- unsigned int bb_index;
- bitmap_iterator bi;
- struct df_urec_problem_data *problem_data =
- (struct df_urec_problem_data *) dflow->problem_data;
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
- if (! dflow->block_pool)
- dflow->block_pool = create_alloc_pool ("df_urec_block pool",
- sizeof (struct df_urec_bb_info), 50);
-
- if (!dflow->problem_data)
+ for (; *ref_rec; ref_rec++)
{
- problem_data = XNEW (struct df_urec_problem_data);
- dflow->problem_data = problem_data;
+ struct df_ref *ref = *ref_rec;
+ if (DF_REF_FLAGS_IS_SET (ref, DF_REF_SIGN_EXTRACT
+ | DF_REF_ZERO_EXTRACT
+ | DF_REF_STRICT_LOW_PART)
+ || GET_CODE (DF_REF_REG (ref)) == SUBREG)
+ bitmap_set_bit (problem_data->needs_expansion, DF_REF_REGNO (ref));
}
- problem_data->earlyclobbers_found = false;
+}
- df_grow_bb_info (dflow);
- /* Because of the clustering of all def sites for the same pseudo,
- we have to process all of the blocks before doing the
- analysis. */
+/* Expand bitmap SRC which is indexed by regno to DEST which is indexed by
+ regno_start and regno_len. */
+
+static void
+df_byte_lr_expand_bitmap (bitmap dest, bitmap src)
+{
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+ bitmap_iterator bi;
+ unsigned int i;
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_rescan, 0, bb_index, bi)
+ bitmap_clear (dest);
+ EXECUTE_IF_SET_IN_BITMAP (src, 0, i, bi)
{
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
- if (bb_info)
- {
- bitmap_clear (bb_info->kill);
- bitmap_clear (bb_info->gen);
- bitmap_clear (bb_info->earlyclobber);
- }
- else
- {
- bb_info = (struct df_urec_bb_info *) pool_alloc (dflow->block_pool);
- df_urec_set_bb_info (dflow, bb_index, bb_info);
- bb_info->kill = BITMAP_ALLOC (NULL);
- bb_info->gen = BITMAP_ALLOC (NULL);
- bb_info->in = BITMAP_ALLOC (NULL);
- bb_info->out = BITMAP_ALLOC (NULL);
- bb_info->earlyclobber = BITMAP_ALLOC (NULL);
- }
+ bitmap_set_range (dest, problem_data->regno_start[i],
+ problem_data->regno_len[i]);
}
}
-/* The function modifies local info for register REG being changed in
- SETTER. DATA is used to pass the current basic block info. */
+/* Allocate or reset bitmaps for DF_BYTE_LR blocks. The solution bits are
+ not touched unless the block is new. */
-static void
-df_urec_mark_reg_change (rtx reg, rtx setter, void *data)
+static void
+df_byte_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
- int regno;
- int endregno;
- int i;
- struct df_urec_bb_info *bb_info = (struct df_urec_bb_info*) data;
-
- if (GET_CODE (reg) == SUBREG)
- reg = SUBREG_REG (reg);
-
- if (!REG_P (reg))
- return;
-
+ unsigned int bb_index;
+ bitmap_iterator bi;
+ basic_block bb;
+ unsigned int regno;
+ unsigned int index = 0;
+ unsigned int max_reg = max_reg_num();
+ struct df_byte_lr_problem_data *problem_data
+ = problem_data = XNEW (struct df_byte_lr_problem_data);
+
+ df_byte_lr->problem_data = problem_data;
+
+ if (!df_byte_lr->block_pool)
+ df_byte_lr->block_pool = create_alloc_pool ("df_byte_lr_block pool",
+ sizeof (struct df_byte_lr_bb_info), 50);
+
+ df_grow_bb_info (df_byte_lr);
+
+ /* Create the mapping from regnos to slots. This does not change
+ unless the problem is destroyed and recreated. In particular, if
+ we end up deleting the only insn that used a subreg, we do not
+ want to redo the mapping because this would invalidate everything
+ else. */
+
+ bitmap_obstack_initialize (&problem_data->byte_lr_bitmaps);
+ problem_data->regno_start = XNEWVEC (unsigned int, max_reg);
+ problem_data->regno_len = XNEWVEC (unsigned int, max_reg);
+ problem_data->hardware_regs_used = BITMAP_ALLOC (&problem_data->byte_lr_bitmaps);
+ problem_data->invalidated_by_call = BITMAP_ALLOC (&problem_data->byte_lr_bitmaps);
+ problem_data->needs_expansion = BITMAP_ALLOC (&problem_data->byte_lr_bitmaps);
- endregno = regno = REGNO (reg);
- if (regno < FIRST_PSEUDO_REGISTER)
+ /* Discover which regno's use subregs, extracts or
+ strict_low_parts. */
+ FOR_EACH_BB (bb)
{
- endregno +=hard_regno_nregs[regno][GET_MODE (reg)];
-
- for (i = regno; i < endregno; i++)
+ rtx insn;
+ FOR_BB_INSNS (bb, insn)
{
- bitmap_set_bit (bb_info->kill, i);
-
- if (GET_CODE (setter) != CLOBBER)
- bitmap_set_bit (bb_info->gen, i);
- else
- bitmap_clear_bit (bb_info->gen, i);
+ if (INSN_P (insn))
+ {
+ struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
+ df_byte_lr_check_regs (DF_INSN_INFO_DEFS (insn_info));
+ df_byte_lr_check_regs (DF_INSN_INFO_USES (insn_info));
+ }
}
+ bitmap_set_bit (df_byte_lr->out_of_date_transfer_functions, bb->index);
}
- else
+
+ bitmap_set_bit (df_byte_lr->out_of_date_transfer_functions, ENTRY_BLOCK);
+ bitmap_set_bit (df_byte_lr->out_of_date_transfer_functions, EXIT_BLOCK);
+
+ /* Allocate the slots for each regno. */
+ for (regno = 0; regno < max_reg; regno++)
{
- bitmap_set_bit (bb_info->kill, regno);
+ int len;
+ problem_data->regno_start[regno] = index;
+ if (bitmap_bit_p (problem_data->needs_expansion, regno))
+ len = GET_MODE_SIZE (GET_MODE (regno_reg_rtx[regno]));
+ else
+ len = 1;
- if (GET_CODE (setter) != CLOBBER)
- bitmap_set_bit (bb_info->gen, regno);
+ problem_data->regno_len[regno] = len;
+ index += len;
+ }
+
+ df_byte_lr_expand_bitmap (problem_data->hardware_regs_used,
+ df->hardware_regs_used);
+ df_byte_lr_expand_bitmap (problem_data->invalidated_by_call,
+ df_invalidated_by_call);
+
+ EXECUTE_IF_SET_IN_BITMAP (df_byte_lr->out_of_date_transfer_functions, 0, bb_index, bi)
+ {
+ struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
+ if (bb_info)
+ {
+ bitmap_clear (bb_info->def);
+ bitmap_clear (bb_info->use);
+ }
else
- bitmap_clear_bit (bb_info->gen, regno);
+ {
+ bb_info = (struct df_byte_lr_bb_info *) pool_alloc (df_byte_lr->block_pool);
+ df_byte_lr_set_bb_info (bb_index, bb_info);
+ bb_info->use = BITMAP_ALLOC (&problem_data->byte_lr_bitmaps);
+ bb_info->def = BITMAP_ALLOC (&problem_data->byte_lr_bitmaps);
+ bb_info->in = BITMAP_ALLOC (&problem_data->byte_lr_bitmaps);
+ bb_info->out = BITMAP_ALLOC (&problem_data->byte_lr_bitmaps);
+ }
}
+
+ df_byte_lr->optional_p = true;
}
-/* Classes of registers which could be early clobbered in the current
- insn. */
-
-DEF_VEC_I(int);
-DEF_VEC_ALLOC_I(int,heap);
-static VEC(int,heap) *earlyclobber_regclass;
-/* This function finds and stores register classes that could be early
- clobbered in INSN. If any earlyclobber classes are found, the function
- returns TRUE, in all other cases it returns FALSE. */
+/* Reset the global solution for recalculation. */
-static bool
-df_urec_check_earlyclobber (rtx insn)
+static void
+df_byte_lr_reset (bitmap all_blocks)
{
- int opno;
- bool found = false;
-
- extract_insn (insn);
+ unsigned int bb_index;
+ bitmap_iterator bi;
- VEC_truncate (int, earlyclobber_regclass, 0);
- for (opno = 0; opno < recog_data.n_operands; opno++)
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- char c;
- bool amp_p;
- int i;
- enum reg_class class;
- const char *p = recog_data.constraints[opno];
-
- class = NO_REGS;
- amp_p = false;
- for (;;)
- {
- c = *p;
- switch (c)
- {
- case '=': case '+': case '?':
- case '#': case '!':
- case '*': case '%':
- case 'm': case '<': case '>': case 'V': case 'o':
- case 'E': case 'F': case 'G': case 'H':
- case 's': case 'i': case 'n':
- case 'I': case 'J': case 'K': case 'L':
- case 'M': case 'N': case 'O': case 'P':
- case 'X':
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- /* These don't say anything we care about. */
- break;
-
- case '&':
- amp_p = true;
- break;
- case '\0':
- case ',':
- if (amp_p && class != NO_REGS)
- {
- int rc;
-
- found = true;
- for (i = 0;
- VEC_iterate (int, earlyclobber_regclass, i, rc);
- i++)
- {
- if (rc == (int) class)
- goto found_rc;
- }
-
- /* We use VEC_quick_push here because
- earlyclobber_regclass holds no more than
- N_REG_CLASSES elements. */
- VEC_quick_push (int, earlyclobber_regclass, (int) class);
- found_rc:
- ;
- }
-
- amp_p = false;
- class = NO_REGS;
- break;
-
- case 'r':
- class = GENERAL_REGS;
- break;
-
- default:
- class = REG_CLASS_FROM_CONSTRAINT (c, p);
- break;
- }
- if (c == '\0')
- break;
- p += CONSTRAINT_LEN (c, p);
- }
+ struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (bb_info->in);
+ bitmap_clear (bb_info->out);
}
-
- return found;
}
-/* The function checks that pseudo-register *X has a class
- intersecting with the class of pseudo-register could be early
- clobbered in the same insn.
- This function is a no-op if earlyclobber_regclass is empty.
-
- Reload can assign the same hard register to uninitialized
- pseudo-register and early clobbered pseudo-register in an insn if
- the pseudo-register is used first time in given BB and not lived at
- the BB start. To prevent this we don't change life information for
- such pseudo-registers. */
+/* Compute local live register info for basic block BB. */
-static int
-df_urec_mark_reg_use_for_earlyclobber (rtx *x, void *data)
+static void
+df_byte_lr_bb_local_compute (unsigned int bb_index)
{
- enum reg_class pref_class, alt_class;
- int i, regno;
- struct df_urec_bb_info *bb_info = (struct df_urec_bb_info*) data;
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
+ rtx insn;
+ struct df_ref **def_rec;
+ struct df_ref **use_rec;
- if (REG_P (*x) && REGNO (*x) >= FIRST_PSEUDO_REGISTER)
+ /* Process the registers set in an exception handler. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
- int rc;
-
- regno = REGNO (*x);
- if (bitmap_bit_p (bb_info->kill, regno)
- || bitmap_bit_p (bb_info->gen, regno))
- return 0;
- pref_class = reg_preferred_class (regno);
- alt_class = reg_alternate_class (regno);
- for (i = 0; VEC_iterate (int, earlyclobber_regclass, i, rc); i++)
+ struct df_ref *def = *def_rec;
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
{
- if (reg_classes_intersect_p (rc, pref_class)
- || (rc != NO_REGS
- && reg_classes_intersect_p (rc, alt_class)))
- {
- bitmap_set_bit (bb_info->earlyclobber, regno);
- break;
- }
+ unsigned int dregno = DF_REF_REGNO (def);
+ unsigned int start = problem_data->regno_start[dregno];
+ unsigned int len = problem_data->regno_len[dregno];
+ bitmap_set_range (bb_info->def, start, len);
+ bitmap_clear_range (bb_info->use, start, len);
}
}
- return 0;
-}
-
-/* The function processes all pseudo-registers in *X with the aid of
- previous function. */
-static void
-df_urec_mark_reg_use_for_earlyclobber_1 (rtx *x, void *data)
-{
- for_each_rtx (x, df_urec_mark_reg_use_for_earlyclobber, data);
-}
+ /* Process the hardware registers that are always live. */
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ {
+ unsigned int uregno = DF_REF_REGNO (use);
+ unsigned int start = problem_data->regno_start[uregno];
+ unsigned int len = problem_data->regno_len[uregno];
+ bitmap_set_range (bb_info->use, start, len);
+ }
+ }
+ FOR_BB_INSNS_REVERSE (bb, insn)
+ {
+ unsigned int uid = INSN_UID (insn);
-/* Compute local uninitialized register info for basic block BB. */
+ if (!INSN_P (insn))
+ continue;
-static void
-df_urec_bb_local_compute (struct dataflow *dflow, unsigned int bb_index)
-{
- struct df *df = dflow->df;
- basic_block bb = BASIC_BLOCK (bb_index);
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
- rtx insn;
- struct df_ref *def;
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ if (!(DF_REF_FLAGS (def) & (DF_REF_CONDITIONAL)))
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ unsigned int start = problem_data->regno_start[dregno];
+ unsigned int len = problem_data->regno_len[dregno];
+ unsigned int sb;
+ unsigned int lb;
+ if (!df_compute_accessed_bytes (def, DF_MM_MUST, &sb, &lb))
+ {
+ start += sb;
+ len = lb - sb;
+ }
+ if (len)
+ {
+ bitmap_set_range (bb_info->def, start, len);
+ bitmap_clear_range (bb_info->use, start, len);
+ }
+ }
+ }
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- {
- unsigned int regno = DF_REF_REGNO (def);
- bitmap_set_bit (bb_info->gen, regno);
- }
-
- FOR_BB_INSNS (bb, insn)
- {
- if (INSN_P (insn))
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
{
- note_stores (PATTERN (insn), df_urec_mark_reg_change, bb_info);
- if (df_state & (DF_SCAN_GLOBAL | DF_SCAN_POST_ALLOC)
- && df_urec_check_earlyclobber (insn))
+ struct df_ref *use = *use_rec;
+ unsigned int uregno = DF_REF_REGNO (use);
+ unsigned int start = problem_data->regno_start[uregno];
+ unsigned int len = problem_data->regno_len[uregno];
+ unsigned int sb;
+ unsigned int lb;
+ if (!df_compute_accessed_bytes (use, DF_MM_MAY, &sb, &lb))
{
- struct df_urec_problem_data *problem_data =
- (struct df_urec_problem_data *) dflow->problem_data;
- problem_data->earlyclobbers_found = true;
- note_uses (&PATTERN (insn),
- df_urec_mark_reg_use_for_earlyclobber_1, bb_info);
+ start += sb;
+ len = lb - sb;
}
+ /* Add use to set of uses in this BB. */
+ if (len)
+ bitmap_set_range (bb_info->use, start, len);
}
}
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
- {
- unsigned int regno = DF_REF_REGNO (def);
- bitmap_set_bit (bb_info->gen, regno);
- }
-
+ /* Process the registers set in an exception handler or the hard
+ frame pointer if this block is the target of a non local
+ goto. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ unsigned int start = problem_data->regno_start[dregno];
+ unsigned int len = problem_data->regno_len[dregno];
+ bitmap_set_range (bb_info->def, start, len);
+ bitmap_clear_range (bb_info->use, start, len);
+ }
+ }
+
+#ifdef EH_USES
+ /* Process the uses that are live into an exception handler. */
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
+ {
+ unsigned int uregno = DF_REF_REGNO (use);
+ unsigned int start = problem_data->regno_start[uregno];
+ unsigned int len = problem_data->regno_len[uregno];
+ bitmap_set_range (bb_info->use, start, len);
+ }
+ }
+#endif
}
-/* Compute local uninitialized register info. */
+/* Compute local live register info for each basic block within BLOCKS. */
static void
-df_urec_local_compute (struct dataflow *dflow,
- bitmap all_blocks ATTRIBUTE_UNUSED,
- bitmap rescan_blocks)
+df_byte_lr_local_compute (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
-#ifdef STACK_REGS
- int i;
- HARD_REG_SET zero, stack_hard_regs, used;
- struct df_urec_problem_data *problem_data =
- (struct df_urec_problem_data *) dflow->problem_data;
-
- /* Any register that MAY be allocated to a register stack (like the
- 387) is treated poorly. Each such register is marked as being
- live everywhere. This keeps the register allocator and the
- subsequent passes from doing anything useful with these values.
-
- FIXME: This seems like an incredibly poor idea. */
-
- CLEAR_HARD_REG_SET (zero);
- CLEAR_HARD_REG_SET (stack_hard_regs);
- for (i = FIRST_STACK_REG; i <= LAST_STACK_REG; i++)
- SET_HARD_REG_BIT (stack_hard_regs, i);
- problem_data->stack_regs = BITMAP_ALLOC (NULL);
- for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
- {
- COPY_HARD_REG_SET (used, reg_class_contents[reg_preferred_class (i)]);
- IOR_HARD_REG_SET (used, reg_class_contents[reg_alternate_class (i)]);
- AND_HARD_REG_SET (used, stack_hard_regs);
- GO_IF_HARD_REG_EQUAL (used, zero, skip);
- bitmap_set_bit (problem_data->stack_regs, i);
- skip:
- ;
- }
-#endif
-
- /* We know that earlyclobber_regclass holds no more than
- N_REG_CLASSES elements. See df_urec_check_earlyclobber. */
- earlyclobber_regclass = VEC_alloc (int, heap, N_REG_CLASSES);
- EXECUTE_IF_SET_IN_BITMAP (rescan_blocks, 0, bb_index, bi)
+ EXECUTE_IF_SET_IN_BITMAP (df_byte_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
- df_urec_bb_local_compute (dflow, bb_index);
+ if (bb_index == EXIT_BLOCK)
+ {
+ /* The exit block is special for this problem and its bits are
+ computed from thin air. */
+ struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (EXIT_BLOCK);
+ df_byte_lr_expand_bitmap (bb_info->use, df->exit_block_uses);
+ }
+ else
+ df_byte_lr_bb_local_compute (bb_index);
}
- VEC_free (int, heap, earlyclobber_regclass);
+ bitmap_clear (df_byte_lr->out_of_date_transfer_functions);
}
/* Initialize the solution vectors. */
static void
-df_urec_init (struct dataflow *dflow, bitmap all_blocks)
+df_byte_lr_init (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
-
- bitmap_copy (bb_info->out, bb_info->gen);
- bitmap_clear (bb_info->in);
+ struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
+ bitmap_copy (bb_info->in, bb_info->use);
+ bitmap_clear (bb_info->out);
}
}
-/* Or in the stack regs, hard regs and early clobber regs into the the
- ur_in sets of all of the blocks. */
-
+/* Confluence function that processes infinite loops. This might be a
+ noreturn function that throws. And even if it isn't, getting the
+ unwind info right helps debugging. */
static void
-df_urec_local_finalize (struct dataflow *dflow, bitmap all_blocks)
+df_byte_lr_confluence_0 (basic_block bb)
{
- struct df *df = dflow->df;
- struct dataflow *lr_dflow = df->problems_by_index[DF_LR];
- bitmap tmp = BITMAP_ALLOC (NULL);
- bitmap_iterator bi;
- unsigned int bb_index;
- struct df_urec_problem_data *problem_data =
- (struct df_urec_problem_data *) dflow->problem_data;
-
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
- {
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
- struct df_lr_bb_info *bb_lr_info = df_lr_get_bb_info (lr_dflow, bb_index);
-
- if (bb_index != ENTRY_BLOCK && bb_index != EXIT_BLOCK)
- {
- if (problem_data->earlyclobbers_found)
- bitmap_ior_into (bb_info->in, bb_info->earlyclobber);
-
-#ifdef STACK_REGS
- /* We can not use the same stack register for uninitialized
- pseudo-register and another living pseudo-register
- because if the uninitialized pseudo-register dies,
- subsequent pass reg-stack will be confused (it will
- believe that the other register dies). */
- bitmap_ior_into (bb_info->in, problem_data->stack_regs);
- bitmap_ior_into (bb_info->out, problem_data->stack_regs);
-#endif
- }
-
- /* No register may reach a location where it is not used. Thus
- we trim the rr result to the places where it is used. */
- bitmap_and_into (bb_info->in, bb_lr_info->in);
- bitmap_and_into (bb_info->out, bb_lr_info->out);
-
-#if 1
- /* Hard registers may still stick in the ur_out set, but not
- be in the ur_in set, if their only mention was in a call
- in this block. This is because a call kills in the lr
- problem but does not kill in the rr problem. To clean
- this up, we execute the transfer function on the lr_in
- set and then use that to knock bits out of ur_out. */
- bitmap_ior_and_compl (tmp, bb_info->gen, bb_lr_info->in,
- bb_info->kill);
- bitmap_and_into (bb_info->out, tmp);
-#endif
- }
-
-#ifdef STACK_REGS
- BITMAP_FREE (problem_data->stack_regs);
-#endif
- BITMAP_FREE (tmp);
-}
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+ bitmap op1 = df_byte_lr_get_bb_info (bb->index)->out;
+ if (bb != EXIT_BLOCK_PTR)
+ bitmap_copy (op1, problem_data->hardware_regs_used);
+}
/* Confluence function that ignores fake edges. */
static void
-df_urec_confluence_n (struct dataflow *dflow, edge e)
+df_byte_lr_confluence_n (edge e)
{
- bitmap op1 = df_urec_get_bb_info (dflow, e->dest->index)->in;
- bitmap op2 = df_urec_get_bb_info (dflow, e->src->index)->out;
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+ bitmap op1 = df_byte_lr_get_bb_info (e->src->index)->out;
+ bitmap op2 = df_byte_lr_get_bb_info (e->dest->index)->in;
- if (e->flags & EDGE_FAKE)
- return;
+ /* Call-clobbered registers die across exception and call edges. */
+ /* ??? Abnormal call edges ignored for the moment, as this gets
+ confused by sibling call edges, which crashes reg-stack. */
+ if (e->flags & EDGE_EH)
+ bitmap_ior_and_compl_into (op1, op2, problem_data->invalidated_by_call);
+ else
+ bitmap_ior_into (op1, op2);
- bitmap_ior_into (op1, op2);
+ bitmap_ior_into (op1, problem_data->hardware_regs_used);
}
/* Transfer function. */
static bool
-df_urec_transfer_function (struct dataflow *dflow, int bb_index)
+df_byte_lr_transfer_function (int bb_index)
{
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb_index);
+ struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb_index);
bitmap in = bb_info->in;
bitmap out = bb_info->out;
- bitmap gen = bb_info->gen;
- bitmap kill = bb_info->kill;
+ bitmap use = bb_info->use;
+ bitmap def = bb_info->def;
- return bitmap_ior_and_compl (out, gen, in, kill);
+ return bitmap_ior_and_compl (in, use, out, def);
}
/* Free all storage associated with the problem. */
static void
-df_urec_free (struct dataflow *dflow)
+df_byte_lr_free (void)
{
- if (dflow->block_info)
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+
+
+ if (df_byte_lr->block_info)
{
- unsigned int i;
-
- for (i = 0; i < dflow->block_info_size; i++)
- {
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, i);
- if (bb_info)
- {
- BITMAP_FREE (bb_info->gen);
- BITMAP_FREE (bb_info->kill);
- BITMAP_FREE (bb_info->in);
- BITMAP_FREE (bb_info->out);
- BITMAP_FREE (bb_info->earlyclobber);
- }
- }
-
- free_alloc_pool (dflow->block_pool);
-
- dflow->block_info_size = 0;
- free (dflow->block_info);
- free (dflow->problem_data);
+ free_alloc_pool (df_byte_lr->block_pool);
+ df_byte_lr->block_info_size = 0;
+ free (df_byte_lr->block_info);
}
- free (dflow);
+
+ BITMAP_FREE (df_byte_lr->out_of_date_transfer_functions);
+ bitmap_obstack_release (&problem_data->byte_lr_bitmaps);
+ free (problem_data->regno_start);
+ free (problem_data->regno_len);
+ free (problem_data);
+ free (df_byte_lr);
}
-/* Debugging info. */
+/* Debugging info at top of bb. */
static void
-df_urec_dump (struct dataflow *dflow, FILE *file)
+df_byte_lr_top_dump (basic_block bb, FILE *file)
{
- basic_block bb;
-
- fprintf (file, "Undefined regs:\n");
-
- FOR_ALL_BB (bb)
- {
- struct df_urec_bb_info *bb_info = df_urec_get_bb_info (dflow, bb->index);
- df_print_bb_index (bb, file);
-
- if (! bb_info->in)
- continue;
+ struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb->index);
+ if (!bb_info || !bb_info->in)
+ return;
- fprintf (file, " in \t");
- dump_bitmap (file, bb_info->in);
- fprintf (file, " gen \t");
- dump_bitmap (file, bb_info->gen);
- fprintf (file, " kill\t");
- dump_bitmap (file, bb_info->kill);
- fprintf (file, " ec\t");
- dump_bitmap (file, bb_info->earlyclobber);
- fprintf (file, " out \t");
- dump_bitmap (file, bb_info->out);
- }
-}
+ fprintf (file, ";; blr in \t");
+ df_print_byte_regset (file, bb_info->in);
+ fprintf (file, ";; blr use \t");
+ df_print_byte_regset (file, bb_info->use);
+ fprintf (file, ";; blr def \t");
+ df_print_byte_regset (file, bb_info->def);
+}
-/* All of the information associated with every instance of the problem. */
-static struct df_problem problem_UREC =
+/* Debugging info at bottom of bb. */
+
+static void
+df_byte_lr_bottom_dump (basic_block bb, FILE *file)
{
- DF_UREC, /* Problem id. */
- DF_FORWARD, /* Direction. */
- df_urec_alloc, /* Allocate the problem specific data. */
- NULL, /* Reset global information. */
- df_urec_free_bb_info, /* Free basic block info. */
- df_urec_local_compute, /* Local compute function. */
- df_urec_init, /* Init the solution specific data. */
- df_iterative_dataflow, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- df_urec_confluence_n, /* Confluence operator n. */
- df_urec_transfer_function, /* Transfer function. */
- df_urec_local_finalize, /* Finalize function. */
- df_urec_free, /* Free all of the problem information. */
- df_urec_dump, /* Debugging. */
- &problem_LR /* Dependent problem. */
+ struct df_byte_lr_bb_info *bb_info = df_byte_lr_get_bb_info (bb->index);
+ if (!bb_info || !bb_info->out)
+ return;
+
+ fprintf (file, ";; blr out \t");
+ df_print_byte_regset (file, bb_info->out);
+}
+
+
+/* All of the information associated with every instance of the problem. */
+
+static struct df_problem problem_BYTE_LR =
+{
+ DF_BYTE_LR, /* Problem id. */
+ DF_BACKWARD, /* Direction. */
+ df_byte_lr_alloc, /* Allocate the problem specific data. */
+ df_byte_lr_reset, /* Reset global information. */
+ df_byte_lr_free_bb_info, /* Free basic block info. */
+ df_byte_lr_local_compute, /* Local compute function. */
+ df_byte_lr_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ df_byte_lr_confluence_0, /* Confluence operator 0. */
+ df_byte_lr_confluence_n, /* Confluence operator n. */
+ df_byte_lr_transfer_function, /* Transfer function. */
+ NULL, /* Finalize function. */
+ df_byte_lr_free, /* Free all of the problem information. */
+ df_byte_lr_free, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_byte_lr_top_dump, /* Debugging start block. */
+ df_byte_lr_bottom_dump, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ NULL, /* Dependent problem. */
+ TV_DF_BYTE_LR, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
};
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_urec_add_problem (struct df *df)
+void
+df_byte_lr_add_problem (void)
{
- return df_add_problem (df, &problem_UREC);
+ df_add_problem (&problem_BYTE_LR);
+ /* These will be initialized when df_scan_blocks processes each
+ block. */
+ df_byte_lr->out_of_date_transfer_functions = BITMAP_ALLOC (NULL);
}
-\f
-/*----------------------------------------------------------------------------
- CREATE DEF_USE (DU) and / or USE_DEF (UD) CHAINS
-
- Link either the defs to the uses and / or the uses to the defs.
-
- These problems are set up like the other dataflow problems so that
- they nicely fit into the framework. They are much simpler and only
- involve a single traversal of instructions and an examination of
- the reaching defs information (the dependent problem).
-----------------------------------------------------------------------------*/
-
-struct df_chain_problem_data
-{
- int flags;
-};
-
-
-/* Create def-use or use-def chains. */
+/* Simulate the effects of the defs of INSN on LIVE. */
-static void
-df_chain_alloc (struct dataflow *dflow,
- bitmap blocks_to_rescan ATTRIBUTE_UNUSED)
+void
+df_byte_lr_simulate_defs (rtx insn, bitmap live)
{
- struct df *df = dflow->df;
- unsigned int i;
- struct df_chain_problem_data *problem_data =
- (struct df_chain_problem_data *) dflow->problem_data;
-
- /* Wholesale destruction of the old chains. */
- if (dflow->block_pool)
- free_alloc_pool (dflow->block_pool);
-
- dflow->block_pool = create_alloc_pool ("df_chain_chain_block pool",
- sizeof (struct df_link), 100);
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+ struct df_ref **def_rec;
+ unsigned int uid = INSN_UID (insn);
- if (problem_data->flags & DF_DU_CHAIN)
- {
- if (!df->def_info.refs_organized)
- df_reorganize_refs (&df->def_info);
-
- /* Clear out the pointers from the refs. */
- for (i = 0; i < DF_DEFS_SIZE (df); i++)
- {
- struct df_ref *ref = df->def_info.refs[i];
- DF_REF_CHAIN (ref) = NULL;
- }
- }
-
- if (problem_data->flags & DF_UD_CHAIN)
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
{
- if (!df->use_info.refs_organized)
- df_reorganize_refs (&df->use_info);
- for (i = 0; i < DF_USES_SIZE (df); i++)
+ struct df_ref *def = *def_rec;
+
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ if (!(DF_REF_FLAGS (def) & DF_REF_CONDITIONAL))
{
- struct df_ref *ref = df->use_info.refs[i];
- DF_REF_CHAIN (ref) = NULL;
+ unsigned int dregno = DF_REF_REGNO (def);
+ unsigned int start = problem_data->regno_start[dregno];
+ unsigned int len = problem_data->regno_len[dregno];
+ unsigned int sb;
+ unsigned int lb;
+ if (!df_compute_accessed_bytes (def, DF_MM_MUST, &sb, &lb))
+ {
+ start += sb;
+ len = lb - sb;
+ }
+
+ if (len)
+ bitmap_clear_range (live, start, len);
}
}
-}
+}
-/* Reset all def_use and use_def chains in INSN. */
+/* Simulate the effects of the uses of INSN on LIVE. */
-static void
-df_chain_insn_reset (struct dataflow *dflow, rtx insn)
+void
+df_byte_lr_simulate_uses (rtx insn, bitmap live)
{
- struct df *df = dflow->df;
- struct df_chain_problem_data *problem_data =
- (struct df_chain_problem_data *) dflow->problem_data;
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+ struct df_ref **use_rec;
unsigned int uid = INSN_UID (insn);
- struct df_insn_info *insn_info = NULL;
- struct df_ref *ref;
-
- if (uid < df->insns_size)
- insn_info = DF_INSN_UID_GET (df, uid);
- if (insn_info)
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
{
- if (problem_data->flags & DF_DU_CHAIN)
- {
- ref = insn_info->defs;
- while (ref)
- {
- ref->chain = NULL;
- ref = ref->next_ref;
- }
- }
-
- if (problem_data->flags & DF_UD_CHAIN)
+ struct df_ref *use = *use_rec;
+ unsigned int uregno = DF_REF_REGNO (use);
+ unsigned int start = problem_data->regno_start[uregno];
+ unsigned int len = problem_data->regno_len[uregno];
+ unsigned int sb;
+ unsigned int lb;
+
+ if (!df_compute_accessed_bytes (use, DF_MM_MAY, &sb, &lb))
{
- ref = insn_info->uses;
- while (ref)
- {
- ref->chain = NULL;
- ref = ref->next_ref;
- }
+ start += sb;
+ len = lb - sb;
}
+
+ /* Add use to set of uses in this BB. */
+ if (len)
+ bitmap_set_range (live, start, len);
}
}
-/* Reset all def_use and use_def chains in basic block. */
+/* Apply the artificial uses and defs at the top of BB in a forwards
+ direction. */
-static void
-df_chain_bb_reset (struct dataflow *dflow, unsigned int bb_index)
+void
+df_byte_lr_simulate_artificial_refs_at_top (basic_block bb, bitmap live)
{
- struct df *df = dflow->df;
- struct df_chain_problem_data *problem_data =
- (struct df_chain_problem_data *) dflow->problem_data;
- rtx insn;
- basic_block bb = BASIC_BLOCK (bb_index);
-
- /* Some one deleted the basic block out from under us. */
- if (!bb)
- return;
-
- FOR_BB_INSNS (bb, insn)
- {
- if (INSN_P (insn))
- {
- /* Record defs within INSN. */
- df_chain_insn_reset (dflow, insn);
- }
- }
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+ struct df_ref **def_rec;
+#ifdef EH_USES
+ struct df_ref **use_rec;
+#endif
+ int bb_index = bb->index;
- /* Get rid of any chains in artificial uses or defs. */
- if (problem_data->flags & DF_DU_CHAIN)
+#ifdef EH_USES
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
{
- struct df_ref *def;
- def = df_get_artificial_defs (df, bb_index);
- while (def)
+ struct df_ref *use = *use_rec;
+ if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
{
- def->chain = NULL;
- def = def->next_ref;
+ unsigned int uregno = DF_REF_REGNO (use);
+ unsigned int start = problem_data->regno_start[uregno];
+ unsigned int len = problem_data->regno_len[uregno];
+ bitmap_set_range (live, start, len);
}
}
+#endif
- if (problem_data->flags & DF_UD_CHAIN)
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
- struct df_ref *use;
- use = df_get_artificial_uses (df, bb_index);
- while (use)
- {
- use->chain = NULL;
- use = use->next_ref;
+ struct df_ref *def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ unsigned int start = problem_data->regno_start[dregno];
+ unsigned int len = problem_data->regno_len[dregno];
+ bitmap_clear_range (live, start, len);
}
}
}
-/* Reset all of the chains when the set of basic blocks changes. */
-
+/* Apply the artificial uses and defs at the end of BB in a backwards
+ direction. */
-static void
-df_chain_reset (struct dataflow *dflow, bitmap blocks_to_clear)
+void
+df_byte_lr_simulate_artificial_refs_at_end (basic_block bb, bitmap live)
{
- bitmap_iterator bi;
- unsigned int bb_index;
+ struct df_byte_lr_problem_data *problem_data
+ = (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
+ struct df_ref **def_rec;
+ struct df_ref **use_rec;
+ int bb_index = bb->index;
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_clear, 0, bb_index, bi)
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
- df_chain_bb_reset (dflow, bb_index);
+ struct df_ref *def = *def_rec;
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ unsigned int start = problem_data->regno_start[dregno];
+ unsigned int len = problem_data->regno_len[dregno];
+ bitmap_clear_range (live, start, len);
+ }
}
- free_alloc_pool (dflow->block_pool);
- dflow->block_pool = NULL;
-}
-
-
-/* Create the chains for a list of USEs. */
-
-static void
-df_chain_create_bb_process_use (struct dataflow *dflow,
- struct df_chain_problem_data *problem_data,
- bitmap local_rd,
- struct df_ref *use,
- enum df_ref_flags top_flag)
-{
- struct df *df = dflow->df;
- bitmap_iterator bi;
- unsigned int def_index;
-
- while (use)
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
{
- /* Do not want to go through this for an uninitialized var. */
- unsigned int uregno = DF_REF_REGNO (use);
- int count = DF_REG_DEF_GET (df, uregno)->n_refs;
- if (count)
+ struct df_ref *use = *use_rec;
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
{
- if (top_flag == (DF_REF_FLAGS (use) & DF_REF_AT_TOP))
- {
- unsigned int first_index = DF_REG_DEF_GET (df, uregno)->begin;
- unsigned int last_index = first_index + count - 1;
-
- EXECUTE_IF_SET_IN_BITMAP (local_rd, first_index, def_index, bi)
- {
- struct df_ref *def;
- if (def_index > last_index)
- break;
-
- def = DF_DEFS_GET (df, def_index);
- if (problem_data->flags & DF_DU_CHAIN)
- df_chain_create (dflow, def, use);
- if (problem_data->flags & DF_UD_CHAIN)
- df_chain_create (dflow, use, def);
- }
- }
+ unsigned int uregno = DF_REF_REGNO (use);
+ unsigned int start = problem_data->regno_start[uregno];
+ unsigned int len = problem_data->regno_len[uregno];
+ bitmap_set_range (live, start, len);
}
- use = use->next_ref;
}
}
-/* Reset the storage pool that the def-use or use-def chains have been
- allocated in. We do not need to re adjust the pointers in the refs,
- these have already been clean out.*/
-
-/* Create chains from reaching defs bitmaps for basic block BB. */
-static void
-df_chain_create_bb (struct dataflow *dflow,
- struct dataflow *rd_dflow,
- unsigned int bb_index)
-{
- basic_block bb = BASIC_BLOCK (bb_index);
- struct df_rd_bb_info *bb_info = df_rd_get_bb_info (rd_dflow, bb_index);
- rtx insn;
- bitmap cpy = BITMAP_ALLOC (NULL);
- struct df *df = dflow->df;
- struct df_chain_problem_data *problem_data =
- (struct df_chain_problem_data *) dflow->problem_data;
- struct df_ref *def;
-
- bitmap_copy (cpy, bb_info->in);
-
- /* Since we are going forwards, process the artificial uses first
- then the artificial defs second. */
-
-#ifdef EH_USES
- /* Create the chains for the artificial uses from the EH_USES at the
- beginning of the block. */
- df_chain_create_bb_process_use (dflow, problem_data, cpy,
- df_get_artificial_uses (df, bb->index),
- DF_REF_AT_TOP);
-#endif
-
- for (def = df_get_artificial_defs (df, bb_index); def; def = def->next_ref)
- if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- {
- unsigned int dregno = DF_REF_REGNO (def);
- bitmap_clear_range (cpy,
- DF_REG_DEF_GET (df, dregno)->begin,
- DF_REG_DEF_GET (df, dregno)->n_refs);
- if (! (DF_REF_FLAGS (def) & DF_REF_CLOBBER))
- bitmap_set_bit (cpy, DF_REF_ID (def));
- }
-
- /* Process the regular instructions next. */
- FOR_BB_INSNS (bb, insn)
- {
- struct df_ref *def;
- unsigned int uid = INSN_UID (insn);
-
- if (! INSN_P (insn))
- continue;
-
- /* Now scan the uses and link them up with the defs that remain
- in the cpy vector. */
-
- df_chain_create_bb_process_use (dflow, problem_data, cpy,
- DF_INSN_UID_GET (df, uid)->uses, 0);
- /* Since we are going forwards, process the defs second. This
- pass only changes the bits in cpy. */
- for (def = DF_INSN_UID_GET (df, uid)->defs; def; def = def->next_ref)
- {
- unsigned int dregno = DF_REF_REGNO (def);
- bitmap_clear_range (cpy,
- DF_REG_DEF_GET (df, dregno)->begin,
- DF_REG_DEF_GET (df, dregno)->n_refs);
- if (! (DF_REF_FLAGS (def) & DF_REF_CLOBBER))
- bitmap_set_bit (cpy, DF_REF_ID (def));
- }
- }
+\f
+/*----------------------------------------------------------------------------
+ This problem computes REG_DEAD and REG_UNUSED notes.
+ ----------------------------------------------------------------------------*/
- /* Create the chains for the artificial uses of the hard registers
- at the end of the block. */
- df_chain_create_bb_process_use (dflow, problem_data, cpy,
- df_get_artificial_uses (df, bb->index), 0);
+static void
+df_note_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
+{
+ df_note->optional_p = true;
}
-/* Create def-use chains from reaching use bitmaps for basic blocks
- in BLOCKS. */
-
-static void
-df_chain_finalize (struct dataflow *dflow, bitmap all_blocks)
+#ifdef REG_DEAD_DEBUGGING
+static void
+df_print_note (const char *prefix, rtx insn, rtx note)
{
- unsigned int bb_index;
- bitmap_iterator bi;
- struct df *df = dflow->df;
- struct dataflow *rd_dflow = df->problems_by_index [DF_RD];
-
- EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ if (dump_file)
{
- df_chain_create_bb (dflow, rd_dflow, bb_index);
+ fprintf (dump_file, "%s %d ", prefix, INSN_UID (insn));
+ print_rtl (dump_file, note);
+ fprintf (dump_file, "\n");
}
}
+#endif
-/* Free all storage associated with the problem. */
+/* After reg-stack, the x86 floating point stack regs are difficult to
+ analyze because of all of the pushes, pops and rotations. Thus, we
+ just leave the notes alone. */
-static void
-df_chain_free (struct dataflow *dflow)
+#ifdef STACK_REGS
+static inline bool
+df_ignore_stack_reg (int regno)
+{
+ return regstack_completed
+ && IN_RANGE (regno, FIRST_STACK_REG, LAST_STACK_REG);
+}
+#else
+static inline bool
+df_ignore_stack_reg (int regno ATTRIBUTE_UNUSED)
{
- free_alloc_pool (dflow->block_pool);
- free (dflow->problem_data);
- free (dflow);
+ return false;
}
+#endif
-/* Debugging info. */
+/* Remove all of the REG_DEAD or REG_UNUSED notes from INSN and add
+ them to OLD_DEAD_NOTES and OLD_UNUSED_NOTES. */
static void
-df_chains_dump (struct dataflow *dflow, FILE *file)
+df_kill_notes (rtx insn, rtx *old_dead_notes, rtx *old_unused_notes)
{
- struct df *df = dflow->df;
- unsigned int j;
- struct df_chain_problem_data *problem_data =
- (struct df_chain_problem_data *) dflow->problem_data;
+ rtx *pprev = ®_NOTES (insn);
+ rtx link = *pprev;
+ rtx dead = NULL;
+ rtx unused = NULL;
- if (problem_data->flags & DF_DU_CHAIN)
+ while (link)
{
- fprintf (file, "Def-use chains:\n");
- for (j = 0; j < df->def_info.bitmap_size; j++)
+ switch (REG_NOTE_KIND (link))
{
- struct df_ref *def = DF_DEFS_GET (df, j);
- if (def)
+ case REG_DEAD:
+ /* After reg-stack, we need to ignore any unused notes
+ for the stack registers. */
+ if (df_ignore_stack_reg (REGNO (XEXP (link, 0))))
{
- fprintf (file, "d%d bb %d luid %d insn %d reg %d ",
- j, DF_REF_BBNO (def),
- DF_INSN_LUID (df, DF_REF_INSN (def)),
- DF_REF_INSN (def) ? DF_REF_INSN_UID (def) : -1,
- DF_REF_REGNO (def));
- if (def->flags & DF_REF_READ_WRITE)
- fprintf (file, "read/write ");
- df_chain_dump (df, DF_REF_CHAIN (def), file);
- fprintf (file, "\n");
+ pprev = &XEXP (link, 1);
+ link = *pprev;
}
- }
- }
+ else
+ {
+ rtx next = XEXP (link, 1);
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("deleting: ", insn, link);
+#endif
+ XEXP (link, 1) = dead;
+ dead = link;
+ *pprev = link = next;
+ }
+ break;
- if (problem_data->flags & DF_UD_CHAIN)
- {
- fprintf (file, "Use-def chains:\n");
- for (j = 0; j < df->use_info.bitmap_size; j++)
- {
- struct df_ref *use = DF_USES_GET (df, j);
- if (use)
+ case REG_UNUSED:
+ /* After reg-stack, we need to ignore any unused notes
+ for the stack registers. */
+ if (df_ignore_stack_reg (REGNO (XEXP (link, 0))))
{
- fprintf (file, "u%d bb %d luid %d insn %d reg %d ",
- j, DF_REF_BBNO (use),
- DF_REF_INSN (use) ?
- DF_INSN_LUID (df, DF_REF_INSN (use))
- : -1,
- DF_REF_INSN (DF_USES_GET (df, j)) ?
- DF_REF_INSN_UID (DF_USES_GET (df,j))
- : -1,
- DF_REF_REGNO (use));
- if (use->flags & DF_REF_READ_WRITE)
- fprintf (file, "read/write ");
- if (use->flags & DF_REF_STRIPPED)
- fprintf (file, "stripped ");
- if (use->flags & DF_REF_IN_NOTE)
- fprintf (file, "note ");
- df_chain_dump (df, DF_REF_CHAIN (use), file);
- fprintf (file, "\n");
+ pprev = &XEXP (link, 1);
+ link = *pprev;
+ }
+ else
+ {
+ rtx next = XEXP (link, 1);
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("deleting: ", insn, link);
+#endif
+ XEXP (link, 1) = unused;
+ unused = link;
+ *pprev = link = next;
}
+ break;
+
+ default:
+ pprev = &XEXP (link, 1);
+ link = *pprev;
+ break;
}
}
+
+ *old_dead_notes = dead;
+ *old_unused_notes = unused;
}
-static struct df_problem problem_CHAIN =
+/* Set a NOTE_TYPE note for REG in INSN. Try to pull it from the OLD
+ list, otherwise create a new one. */
+
+static inline rtx
+df_set_note (enum reg_note note_type, rtx insn, rtx old, rtx reg)
{
- DF_CHAIN, /* Problem id. */
- DF_NONE, /* Direction. */
- df_chain_alloc, /* Allocate the problem specific data. */
- df_chain_reset, /* Reset global information. */
- NULL, /* Free basic block info. */
- NULL, /* Local compute function. */
- NULL, /* Init the solution specific data. */
- NULL, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- NULL, /* Confluence operator n. */
- NULL, /* Transfer function. */
- df_chain_finalize, /* Finalize function. */
- df_chain_free, /* Free all of the problem information. */
- df_chains_dump, /* Debugging. */
- &problem_RD /* Dependent problem. */
-};
+ rtx curr = old;
+ rtx prev = NULL;
+ while (curr)
+ if (XEXP (curr, 0) == reg)
+ {
+ if (prev)
+ XEXP (prev, 1) = XEXP (curr, 1);
+ else
+ old = XEXP (curr, 1);
+ XEXP (curr, 1) = REG_NOTES (insn);
+ REG_NOTES (insn) = curr;
+ return old;
+ }
+ else
+ {
+ prev = curr;
+ curr = XEXP (curr, 1);
+ }
+
+ /* Did not find the note. */
+ add_reg_note (insn, note_type, reg);
+ return old;
+}
-/* Create a new DATAFLOW instance and add it to an existing instance
- of DF. The returned structure is what is used to get at the
- solution. */
+/* A subroutine of df_set_unused_notes_for_mw, with a selection of its
+ arguments. Return true if the register value described by MWS's
+ mw_reg is known to be completely unused, and if mw_reg can therefore
+ be used in a REG_UNUSED note. */
-struct dataflow *
-df_chain_add_problem (struct df *df, int flags)
+static bool
+df_whole_mw_reg_unused_p (struct df_mw_hardreg *mws,
+ bitmap live, bitmap artificial_uses)
{
- struct df_chain_problem_data *problem_data =
- XNEW (struct df_chain_problem_data);
- struct dataflow *dflow = df_add_problem (df, &problem_CHAIN);
+ unsigned int r;
- dflow->problem_data = problem_data;
- problem_data->flags = flags;
-
- return dflow;
+ /* If MWS describes a partial reference, create REG_UNUSED notes for
+ individual hard registers. */
+ if (mws->flags & DF_REF_PARTIAL)
+ return false;
+
+ /* Likewise if some part of the register is used. */
+ for (r = mws->start_regno; r <= mws->end_regno; r++)
+ if (bitmap_bit_p (live, r)
+ || bitmap_bit_p (artificial_uses, r))
+ return false;
+
+ gcc_assert (REG_P (mws->mw_reg));
+ return true;
}
+/* Set the REG_UNUSED notes for the multiword hardreg defs in INSN
+ based on the bits in LIVE. Do not generate notes for registers in
+ artificial uses. DO_NOT_GEN is updated so that REG_DEAD notes are
+ not generated if the reg is both read and written by the
+ instruction.
+*/
-/*----------------------------------------------------------------------------
- REGISTER INFORMATION
+static rtx
+df_set_unused_notes_for_mw (rtx insn, rtx old, struct df_mw_hardreg *mws,
+ bitmap live, bitmap do_not_gen,
+ bitmap artificial_uses)
+{
+ unsigned int r;
+
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ fprintf (dump_file, "mw_set_unused looking at mws[%d..%d]\n",
+ mws->start_regno, mws->end_regno);
+#endif
- Currently this consists of only lifetime information. But the plan is
- to enhance it so that it produces all of the register information needed
- by the register allocators.
-----------------------------------------------------------------------------*/
+ if (df_whole_mw_reg_unused_p (mws, live, artificial_uses))
+ {
+ unsigned int regno = mws->start_regno;
+ old = df_set_note (REG_UNUSED, insn, old, mws->mw_reg);
+
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("adding 1: ", insn, REG_NOTES (insn));
+#endif
+ bitmap_set_bit (do_not_gen, regno);
+ /* Only do this if the value is totally dead. */
+ }
+ else
+ for (r = mws->start_regno; r <= mws->end_regno; r++)
+ {
+ if (!bitmap_bit_p (live, r)
+ && !bitmap_bit_p (artificial_uses, r))
+ {
+ old = df_set_note (REG_UNUSED, insn, old, regno_reg_rtx[r]);
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("adding 2: ", insn, REG_NOTES (insn));
+#endif
+ }
+ bitmap_set_bit (do_not_gen, r);
+ }
+ return old;
+}
-struct df_ri_problem_data
+/* A subroutine of df_set_dead_notes_for_mw, with a selection of its
+ arguments. Return true if the register value described by MWS's
+ mw_reg is known to be completely dead, and if mw_reg can therefore
+ be used in a REG_DEAD note. */
+
+static bool
+df_whole_mw_reg_dead_p (struct df_mw_hardreg *mws,
+ bitmap live, bitmap artificial_uses,
+ bitmap do_not_gen)
{
- int *lifetime;
-};
+ unsigned int r;
+ /* If MWS describes a partial reference, create REG_DEAD notes for
+ individual hard registers. */
+ if (mws->flags & DF_REF_PARTIAL)
+ return false;
-/* Allocate the lifetime information. */
+ /* Likewise if some part of the register is not dead. */
+ for (r = mws->start_regno; r <= mws->end_regno; r++)
+ if (bitmap_bit_p (live, r)
+ || bitmap_bit_p (artificial_uses, r)
+ || bitmap_bit_p (do_not_gen, r))
+ return false;
-static void
-df_ri_alloc (struct dataflow *dflow, bitmap blocks_to_rescan ATTRIBUTE_UNUSED)
+ gcc_assert (REG_P (mws->mw_reg));
+ return true;
+}
+
+/* Set the REG_DEAD notes for the multiword hardreg use in INSN based
+ on the bits in LIVE. DO_NOT_GEN is used to keep REG_DEAD notes
+ from being set if the instruction both reads and writes the
+ register. */
+
+static rtx
+df_set_dead_notes_for_mw (rtx insn, rtx old, struct df_mw_hardreg *mws,
+ bitmap live, bitmap do_not_gen,
+ bitmap artificial_uses)
{
- struct df_ri_problem_data *problem_data =
- (struct df_ri_problem_data *) dflow->problem_data;
+ unsigned int r;
+
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ {
+ fprintf (dump_file, "mw_set_dead looking at mws[%d..%d]\n do_not_gen =",
+ mws->start_regno, mws->end_regno);
+ df_print_regset (dump_file, do_not_gen);
+ fprintf (dump_file, " live =");
+ df_print_regset (dump_file, live);
+ fprintf (dump_file, " artificial uses =");
+ df_print_regset (dump_file, artificial_uses);
+ }
+#endif
+
+ if (df_whole_mw_reg_dead_p (mws, live, artificial_uses, do_not_gen))
+ {
+ /* Add a dead note for the entire multi word register. */
+ old = df_set_note (REG_DEAD, insn, old, mws->mw_reg);
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("adding 1: ", insn, REG_NOTES (insn));
+#endif
+ }
+ else
+ {
+ for (r = mws->start_regno; r <= mws->end_regno; r++)
+ if (!bitmap_bit_p (live, r)
+ && !bitmap_bit_p (artificial_uses, r)
+ && !bitmap_bit_p (do_not_gen, r))
+ {
+ old = df_set_note (REG_DEAD, insn, old, regno_reg_rtx[r]);
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("adding 2: ", insn, REG_NOTES (insn));
+#endif
+ }
+ }
+ return old;
+}
- if (!dflow->problem_data)
+
+/* Create a REG_UNUSED note if necessary for DEF in INSN updating
+ LIVE. Do not generate notes for registers in ARTIFICIAL_USES. */
+
+static rtx
+df_create_unused_note (rtx insn, rtx old, struct df_ref *def,
+ bitmap live, bitmap artificial_uses)
+{
+ unsigned int dregno = DF_REF_REGNO (def);
+
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
{
- struct df_ri_problem_data *problem_data = XNEW (struct df_ri_problem_data);
- dflow->problem_data = problem_data;
+ fprintf (dump_file, " regular looking at def ");
+ df_ref_debug (def, dump_file);
}
+#endif
- problem_data->lifetime = xrealloc (problem_data->lifetime,
- max_reg_num () *sizeof (int));
- memset (problem_data->lifetime, 0, max_reg_num () *sizeof (int));
+ if (!(bitmap_bit_p (live, dregno)
+ || (DF_REF_FLAGS (def) & DF_REF_MW_HARDREG)
+ || bitmap_bit_p (artificial_uses, dregno)
+ || df_ignore_stack_reg (dregno)))
+ {
+ rtx reg = (DF_REF_LOC (def))
+ ? *DF_REF_REAL_LOC (def): DF_REF_REG (def);
+ old = df_set_note (REG_UNUSED, insn, old, reg);
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("adding 3: ", insn, REG_NOTES (insn));
+#endif
+ }
+
+ return old;
}
-/* Compute register info: lifetime, bb, and number of defs and uses
- for basic block BB. */
+
+/* Recompute the REG_DEAD and REG_UNUSED notes and compute register
+ info: lifetime, bb, and number of defs and uses for basic block
+ BB. The three bitvectors are scratch regs used here. */
static void
-df_ri_bb_compute (struct dataflow *dflow, unsigned int bb_index, bitmap live)
+df_note_bb_compute (unsigned int bb_index,
+ bitmap live, bitmap do_not_gen, bitmap artificial_uses)
{
- struct df *df = dflow->df;
- struct df_ur_bb_info *bb_info = df_ur_get_bb_info (dflow, bb_index);
- struct df_ri_problem_data *problem_data =
- (struct df_ri_problem_data *) dflow->problem_data;
basic_block bb = BASIC_BLOCK (bb_index);
rtx insn;
+ struct df_ref **def_rec;
+ struct df_ref **use_rec;
+
+ bitmap_copy (live, df_get_live_out (bb));
+ bitmap_clear (artificial_uses);
+
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ {
+ fprintf (dump_file, "live at bottom ");
+ df_print_regset (dump_file, live);
+ }
+#endif
+
+ /* Process the artificial defs and uses at the bottom of the block
+ to begin processing. */
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ fprintf (dump_file, "artificial def %d\n", DF_REF_REGNO (def));
+#endif
+
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
+ bitmap_clear_bit (live, DF_REF_REGNO (def));
+ }
- bitmap_copy (live, bb_info->out);
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ {
+ unsigned int regno = DF_REF_REGNO (use);
+ bitmap_set_bit (live, regno);
+
+ /* Notes are not generated for any of the artificial registers
+ at the bottom of the block. */
+ bitmap_set_bit (artificial_uses, regno);
+ }
+ }
+
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ {
+ fprintf (dump_file, "live before artificials out ");
+ df_print_regset (dump_file, live);
+ }
+#endif
FOR_BB_INSNS_REVERSE (bb, insn)
{
unsigned int uid = INSN_UID (insn);
- unsigned int regno;
- bitmap_iterator bi;
- struct df_ref *def;
- struct df_ref *use;
-
- if (! INSN_P (insn))
+ struct df_mw_hardreg **mws_rec;
+ rtx old_dead_notes;
+ rtx old_unused_notes;
+
+ if (!INSN_P (insn))
continue;
- for (def = DF_INSN_UID_GET (df, uid)->defs; def; def = def->next_ref)
+ bitmap_clear (do_not_gen);
+ df_kill_notes (insn, &old_dead_notes, &old_unused_notes);
+
+ /* Process the defs. */
+ if (CALL_P (insn))
{
- unsigned int dregno = DF_REF_REGNO (def);
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ {
+ fprintf (dump_file, "processing call %d\n live =", INSN_UID (insn));
+ df_print_regset (dump_file, live);
+ }
+#endif
+ /* We only care about real sets for calls. Clobbers cannot
+ be depended on to really die. */
+ mws_rec = DF_INSN_UID_MWS (uid);
+ while (*mws_rec)
+ {
+ struct df_mw_hardreg *mws = *mws_rec;
+ if ((mws->type == DF_REF_REG_DEF)
+ && !df_ignore_stack_reg (mws->start_regno))
+ old_unused_notes
+ = df_set_unused_notes_for_mw (insn, old_unused_notes,
+ mws, live, do_not_gen,
+ artificial_uses);
+ mws_rec++;
+ }
+
+ /* All of the defs except the return value are some sort of
+ clobber. This code is for the return. */
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+ if (!DF_REF_FLAGS_IS_SET (def, DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER))
+ {
+ old_unused_notes
+ = df_create_unused_note (insn, old_unused_notes,
+ def, live, artificial_uses);
+ bitmap_set_bit (do_not_gen, dregno);
+ }
- /* Kill this register. */
- bitmap_clear_bit (live, dregno);
+ if (!DF_REF_FLAGS_IS_SET (def, DF_REF_PARTIAL | DF_REF_CONDITIONAL))
+ bitmap_clear_bit (live, dregno);
+ }
+ }
+ else
+ {
+ /* Regular insn. */
+ mws_rec = DF_INSN_UID_MWS (uid);
+ while (*mws_rec)
+ {
+ struct df_mw_hardreg *mws = *mws_rec;
+ if (mws->type == DF_REF_REG_DEF)
+ old_unused_notes
+ = df_set_unused_notes_for_mw (insn, old_unused_notes,
+ mws, live, do_not_gen,
+ artificial_uses);
+ mws_rec++;
+ }
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+ old_unused_notes
+ = df_create_unused_note (insn, old_unused_notes,
+ def, live, artificial_uses);
+
+ if (!DF_REF_FLAGS_IS_SET (def, DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER))
+ bitmap_set_bit (do_not_gen, dregno);
+
+ if (!DF_REF_FLAGS_IS_SET (def, DF_REF_PARTIAL | DF_REF_CONDITIONAL))
+ bitmap_clear_bit (live, dregno);
+ }
+ }
+
+ /* Process the uses. */
+ mws_rec = DF_INSN_UID_MWS (uid);
+ while (*mws_rec)
+ {
+ struct df_mw_hardreg *mws = *mws_rec;
+ if ((mws->type != DF_REF_REG_DEF)
+ && !df_ignore_stack_reg (mws->start_regno))
+ old_dead_notes
+ = df_set_dead_notes_for_mw (insn, old_dead_notes,
+ mws, live, do_not_gen,
+ artificial_uses);
+ mws_rec++;
}
- for (use = DF_INSN_UID_GET (df, uid)->uses; use; use = use->next_ref)
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
{
+ struct df_ref *use = *use_rec;
unsigned int uregno = DF_REF_REGNO (use);
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ {
+ fprintf (dump_file, " regular looking at use ");
+ df_ref_debug (use, dump_file);
+ }
+#endif
if (!bitmap_bit_p (live, uregno))
{
- use->flags |= DF_REF_DIES_AFTER_THIS_USE;
+ if ( (!(DF_REF_FLAGS (use) & DF_REF_MW_HARDREG))
+ && (!bitmap_bit_p (do_not_gen, uregno))
+ && (!bitmap_bit_p (artificial_uses, uregno))
+ && (!(DF_REF_FLAGS (use) & DF_REF_READ_WRITE))
+ && (!df_ignore_stack_reg (uregno)))
+ {
+ rtx reg = (DF_REF_LOC (use))
+ ? *DF_REF_REAL_LOC (use) : DF_REF_REG (use);
+ old_dead_notes = df_set_note (REG_DEAD, insn, old_dead_notes, reg);
+
+#ifdef REG_DEAD_DEBUGGING
+ df_print_note ("adding 4: ", insn, REG_NOTES (insn));
+#endif
+ }
/* This register is now live. */
bitmap_set_bit (live, uregno);
}
- else
- use->flags &= ~DF_REF_DIES_AFTER_THIS_USE;
}
- /* Increment lifetimes of all live registers. */
- EXECUTE_IF_SET_IN_BITMAP (live, 0, regno, bi)
+ while (old_unused_notes)
+ {
+ rtx next = XEXP (old_unused_notes, 1);
+ free_EXPR_LIST_node (old_unused_notes);
+ old_unused_notes = next;
+ }
+ while (old_dead_notes)
{
- problem_data->lifetime[regno]++;
+ rtx next = XEXP (old_dead_notes, 1);
+ free_EXPR_LIST_node (old_dead_notes);
+ old_dead_notes = next;
}
}
}
/* Compute register info: lifetime, bb, and number of defs and uses. */
static void
-df_ri_compute (struct dataflow *dflow, bitmap all_blocks ATTRIBUTE_UNUSED,
- bitmap blocks_to_scan)
+df_note_compute (bitmap all_blocks)
{
unsigned int bb_index;
bitmap_iterator bi;
- bitmap live;
+ bitmap live = BITMAP_ALLOC (&df_bitmap_obstack);
+ bitmap do_not_gen = BITMAP_ALLOC (&df_bitmap_obstack);
+ bitmap artificial_uses = BITMAP_ALLOC (&df_bitmap_obstack);
- live = BITMAP_ALLOC (NULL);
+#ifdef REG_DEAD_DEBUGGING
+ if (dump_file)
+ print_rtl_with_bb (dump_file, get_insns());
+#endif
- EXECUTE_IF_SET_IN_BITMAP (blocks_to_scan, 0, bb_index, bi)
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
- df_ri_bb_compute (dflow, bb_index, live);
+ df_note_bb_compute (bb_index, live, do_not_gen, artificial_uses);
}
BITMAP_FREE (live);
+ BITMAP_FREE (do_not_gen);
+ BITMAP_FREE (artificial_uses);
}
/* Free all storage associated with the problem. */
static void
-df_ri_free (struct dataflow *dflow)
+df_note_free (void)
{
- struct df_ri_problem_data *problem_data =
- (struct df_ri_problem_data *) dflow->problem_data;
-
- free (problem_data->lifetime);
- free (dflow->problem_data);
- free (dflow);
+ free (df_note);
}
-/* Debugging info. */
-
-static void
-df_ri_dump (struct dataflow *dflow, FILE *file)
-{
- struct df_ri_problem_data *problem_data =
- (struct df_ri_problem_data *) dflow->problem_data;
- int j;
-
- fprintf (file, "Register info:\n");
- for (j = 0; j < max_reg_num (); j++)
- {
- fprintf (file, "reg %d life %d\n", j, problem_data->lifetime[j]);
- }
-}
-
/* All of the information associated every instance of the problem. */
-static struct df_problem problem_RI =
+static struct df_problem problem_NOTE =
{
- DF_RI, /* Problem id. */
+ DF_NOTE, /* Problem id. */
DF_NONE, /* Direction. */
- df_ri_alloc, /* Allocate the problem specific data. */
+ df_note_alloc, /* Allocate the problem specific data. */
NULL, /* Reset global information. */
NULL, /* Free basic block info. */
- df_ri_compute, /* Local compute function. */
+ df_note_compute, /* Local compute function. */
NULL, /* Init the solution specific data. */
NULL, /* Iterative solver. */
NULL, /* Confluence operator 0. */
NULL, /* Confluence operator n. */
NULL, /* Transfer function. */
NULL, /* Finalize function. */
- df_ri_free, /* Free all of the problem information. */
- df_ri_dump, /* Debugging. */
- &problem_UR /* Dependent problem. */
+ df_note_free, /* Free all of the problem information. */
+ df_note_free, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ NULL, /* Debugging start block. */
+ NULL, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ &problem_LR, /* Dependent problem. */
+ TV_DF_NOTE, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
};
of DF. The returned structure is what is used to get at the
solution. */
-struct dataflow *
-df_ri_add_problem (struct df *df)
+void
+df_note_add_problem (void)
+{
+ df_add_problem (&problem_NOTE);
+}
+
+
+
+\f
+/*----------------------------------------------------------------------------
+ Functions for simulating the effects of single insns.
+
+ You can either simulate in the forwards direction, starting from
+ the top of a block or the backwards direction from the end of the
+ block. The main difference is that if you go forwards, the uses
+ are examined first then the defs, and if you go backwards, the defs
+ are examined first then the uses.
+
+ If you start at the top of the block, use one of DF_LIVE_IN or
+ DF_LR_IN. If you start at the bottom of the block use one of
+ DF_LIVE_OUT or DF_LR_OUT. BE SURE TO PASS A COPY OF THESE SETS,
+ THEY WILL BE DESTROYED.
+----------------------------------------------------------------------------*/
+
+
+/* Find the set of DEFs for INSN. */
+
+void
+df_simulate_find_defs (rtx insn, bitmap defs)
+{
+ struct df_ref **def_rec;
+ unsigned int uid = INSN_UID (insn);
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ bitmap_set_bit (defs, DF_REF_REGNO (def));
+ }
+}
+
+
+/* Simulate the effects of the defs of INSN on LIVE. */
+
+void
+df_simulate_defs (rtx insn, bitmap live)
+{
+ struct df_ref **def_rec;
+ unsigned int uid = INSN_UID (insn);
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ unsigned int dregno = DF_REF_REGNO (def);
+
+ /* If the def is to only part of the reg, it does
+ not kill the other defs that reach here. */
+ if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
+ bitmap_clear_bit (live, dregno);
+ }
+}
+
+
+/* Simulate the effects of the uses of INSN on LIVE. */
+
+void
+df_simulate_uses (rtx insn, bitmap live)
+{
+ struct df_ref **use_rec;
+ unsigned int uid = INSN_UID (insn);
+
+ for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ /* Add use to set of uses in this BB. */
+ bitmap_set_bit (live, DF_REF_REGNO (use));
+ }
+}
+
+
+/* Add back the always live regs in BB to LIVE. */
+
+static inline void
+df_simulate_fixup_sets (basic_block bb, bitmap live)
+{
+ /* These regs are considered always live so if they end up dying
+ because of some def, we need to bring the back again. */
+ if (bb_has_eh_pred (bb))
+ bitmap_ior_into (live, df->eh_block_artificial_uses);
+ else
+ bitmap_ior_into (live, df->regular_block_artificial_uses);
+}
+
+
+/*----------------------------------------------------------------------------
+ The following three functions are used only for BACKWARDS scanning:
+ i.e. they process the defs before the uses.
+
+ df_simulate_artificial_refs_at_end should be called first with a
+ bitvector copyied from the DF_LIVE_OUT or DF_LR_OUT. Then
+ df_simulate_one_insn should be called for each insn in the block,
+ starting with the last on. Finally,
+ df_simulate_artificial_refs_at_top can be called to get a new value
+ of the sets at the top of the block (this is rarely used).
+
+ It would be not be difficult to define a similar set of functions
+ that work in the forwards direction. In that case the functions
+ would ignore the use sets and look for the REG_DEAD and REG_UNUSED
+ notes.
+----------------------------------------------------------------------------*/
+
+/* Apply the artificial uses and defs at the end of BB in a backwards
+ direction. */
+
+void
+df_simulate_artificial_refs_at_end (basic_block bb, bitmap live)
{
- return df_add_problem (df, &problem_RI);
+ struct df_ref **def_rec;
+ struct df_ref **use_rec;
+ int bb_index = bb->index;
+
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
+ bitmap_clear_bit (live, DF_REF_REGNO (def));
+ }
+
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ if ((DF_REF_FLAGS (use) & DF_REF_AT_TOP) == 0)
+ bitmap_set_bit (live, DF_REF_REGNO (use));
+ }
}
-/* Return total lifetime (in insns) of REG. */
-int
-df_reg_lifetime (struct df *df, rtx reg)
+/* Simulate the backwards effects of INSN on the bitmap LIVE. */
+
+void
+df_simulate_one_insn (basic_block bb, rtx insn, bitmap live)
{
- struct dataflow *dflow = df->problems_by_index[DF_RI];
- struct df_ri_problem_data *problem_data =
- (struct df_ri_problem_data *) dflow->problem_data;
- return problem_data->lifetime[REGNO (reg)];
+ if (! INSN_P (insn))
+ return;
+
+ df_simulate_defs (insn, live);
+ df_simulate_uses (insn, live);
+ df_simulate_fixup_sets (bb, live);
}
+/* Apply the artificial uses and defs at the top of BB in a backwards
+ direction. */
+
+void
+df_simulate_artificial_refs_at_top (basic_block bb, bitmap live)
+{
+ struct df_ref **def_rec;
+#ifdef EH_USES
+ struct df_ref **use_rec;
+#endif
+ int bb_index = bb->index;
+
+ for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
+ {
+ struct df_ref *def = *def_rec;
+ if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
+ bitmap_clear_bit (live, DF_REF_REGNO (def));
+ }
+
+#ifdef EH_USES
+ for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
+ {
+ struct df_ref *use = *use_rec;
+ if (DF_REF_FLAGS (use) & DF_REF_AT_TOP)
+ bitmap_set_bit (live, DF_REF_REGNO (use));
+ }
+#endif
+}