/* Standard problems for dataflow support routines.
Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
2008, 2009 Free Software Foundation, Inc.
- Originally contributed by Michael P. Hayes
+ Originally contributed by Michael P. Hayes
(m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
Major rewrite contributed by Danny Berlin (dberlin@dberlin.org)
and Kenneth Zadeck (zadeck@naturalbridge.com).
/* 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. */
+ addresses in the dumps. */
#if 0
#define REG_DEAD_DEBUGGING
#endif
if (df_live)
return DF_LIVE_OUT (bb);
- else
+ else
return DF_LR_OUT (bb);
}
if (df_live)
return DF_LIVE_IN (bb);
- else
+ else
return DF_LR_IN (bb);
}
/* Print some basic block info as part of df_dump. */
-void
+void
df_print_bb_index (basic_block bb, FILE *file)
{
edge e;
{
basic_block pred = e->src;
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%s ", succ->index, e->flags & EDGE_EH ? "(EH)" : "");
- }
+ }
fprintf (file, ")\n");
}
-
-
-/* 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 (&df_bitmap_obstack);
- seen_in_insn = BITMAP_ALLOC (&df_bitmap_obstack);
-}
-
-
-static void
-df_unset_seen (void)
-{
- BITMAP_FREE (seen_in_block);
- BITMAP_FREE (seen_in_insn);
-}
-
-
\f
/*----------------------------------------------------------------------------
REACHING DEFINITIONS
----------------------------------------------------------------------------*/
/* This problem plays a large number of games for the sake of
- efficiency.
-
+ 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.
struct df_rd_problem_data
{
/* The set of defs to regs invalidated by call. */
- bitmap sparse_invalidated_by_call;
- /* The set of defs to regs invalidate by call for rd. */
+ bitmap sparse_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;
/* Set basic block info. */
static void
-df_rd_set_bb_info (unsigned int index,
+df_rd_set_bb_info (unsigned int index,
struct df_rd_bb_info *bb_info)
{
gcc_assert (df_rd);
/* Free basic block info. */
static void
-df_rd_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
+df_rd_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;
/* Allocate or reset bitmaps for DF_RD blocks. The solution bits are
not touched unless the block is new. */
-static void
+static void
df_rd_alloc (bitmap all_blocks)
{
unsigned int bb_index;
struct df_rd_problem_data *problem_data;
if (!df_rd->block_pool)
- df_rd->block_pool = create_alloc_pool ("df_rd_block pool",
+ df_rd->block_pool = create_alloc_pool ("df_rd_block pool",
sizeof (struct df_rd_bb_info), 50);
if (df_rd->problem_data)
bitmap_clear (problem_data->sparse_invalidated_by_call);
bitmap_clear (problem_data->dense_invalidated_by_call);
}
- else
+ else
{
problem_data = XNEW (struct df_rd_problem_data);
df_rd->problem_data = problem_data;
{
struct df_rd_bb_info *bb_info = df_rd_get_bb_info (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 (df_rd->block_pool);
df_rd_set_bb_info (bb_index, bb_info);
bb_info->kill = BITMAP_ALLOC (&problem_data->rd_bitmaps);
{
unsigned int dregno = DF_REF_REGNO (def);
if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
- bitmap_clear_range (local_rd,
- DF_DEFS_BEGIN (dregno),
+ bitmap_clear_range (local_rd,
+ DF_DEFS_BEGIN (dregno),
DF_DEFS_COUNT (dregno));
bitmap_set_bit (local_rd, DF_REF_ID (def));
}
|| (dregno >= FIRST_PSEUDO_REGISTER))
{
if (!(DF_REF_FLAGS (def) & (DF_REF_PARTIAL | DF_REF_CONDITIONAL)))
- bitmap_clear_range (local_rd,
- DF_DEFS_BEGIN (dregno),
+ bitmap_clear_range (local_rd,
+ DF_DEFS_BEGIN (dregno),
DF_DEFS_COUNT (dregno));
- if (!(DF_REF_FLAGS (def)
+ if (!(DF_REF_FLAGS (def)
& (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
bitmap_set_bit (local_rd, DF_REF_ID (def));
}
of kill sets. */
static void
-df_rd_bb_local_compute_process_def (struct df_rd_bb_info *bb_info,
+df_rd_bb_local_compute_process_def (struct df_rd_bb_info *bb_info,
df_ref *def_rec,
int top_flag)
{
unsigned int regno = DF_REF_REGNO (def);
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))
{
/* Only the last def(s) for a regno in the block has any
- effect. */
+ effect. */
if (!bitmap_bit_p (seen_in_block, regno))
{
/* The first def for regno in insn gets to knock out the
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_FLAGS (def) &
(DF_REF_PARTIAL | DF_REF_CONDITIONAL | DF_REF_MAY_CLOBBER))))
{
if (n_defs > DF_SPARSE_THRESHOLD)
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)
+ if (!(DF_REF_FLAGS (def)
& (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
bitmap_set_bit (bb_info->gen, DF_REF_ID (def));
}
/* Artificials are only hard regs. */
if (!(df->changeable_flags & DF_NO_HARD_REGS))
- df_rd_bb_local_compute_process_def (bb_info,
+ df_rd_bb_local_compute_process_def (bb_info,
df_get_artificial_defs (bb_index),
0);
if (!INSN_P (insn))
continue;
- df_rd_bb_local_compute_process_def (bb_info,
+ 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
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_rd_bb_local_compute_process_def (bb_info,
df_get_artificial_defs (bb_index),
DF_REF_AT_TOP);
}
bitmap sparse_invalidated = problem_data->sparse_invalidated_by_call;
bitmap dense_invalidated = problem_data->dense_invalidated_by_call;
- df_set_seen ();
+ seen_in_block = BITMAP_ALLOC (&df_bitmap_obstack);
+ seen_in_insn = BITMAP_ALLOC (&df_bitmap_obstack);
df_maybe_reorganize_def_refs (DF_REF_ORDER_BY_REG);
{
df_rd_bb_local_compute (bb_index);
}
-
+
/* Set up the knockout bit vectors to be applied across EH_EDGES. */
EXECUTE_IF_SET_IN_BITMAP (regs_invalidated_by_call_regset, 0, regno, bi)
{
if (DF_DEFS_COUNT (regno) > DF_SPARSE_THRESHOLD)
bitmap_set_bit (sparse_invalidated, regno);
else
- bitmap_set_range (dense_invalidated,
- DF_DEFS_BEGIN (regno),
+ bitmap_set_range (dense_invalidated,
+ DF_DEFS_BEGIN (regno),
DF_DEFS_COUNT (regno));
}
- df_unset_seen ();
+
+ BITMAP_FREE (seen_in_block);
+ BITMAP_FREE (seen_in_insn);
}
/* Initialize the solution bit vectors for problem. */
-static void
+static void
df_rd_init_solution (bitmap all_blocks)
{
unsigned int bb_index;
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
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);
}
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)
+ if (e->flags & EDGE_FAKE)
return;
if (e->flags & EDGE_EH)
EXECUTE_IF_SET_IN_BITMAP (sparse_invalidated, 0, regno, bi)
{
- bitmap_clear_range (tmp,
- DF_DEFS_BEGIN (regno),
+ bitmap_clear_range (tmp,
+ DF_DEFS_BEGIN (regno),
DF_DEFS_COUNT (regno));
}
bitmap_ior_into (op1, tmp);
if (bitmap_empty_p (sparse_kill))
return bitmap_ior_and_compl (out, gen, in, kill);
- else
+ else
{
struct df_rd_problem_data *problem_data;
bool changed = false;
bitmap_copy (tmp, in);
EXECUTE_IF_SET_IN_BITMAP (sparse_kill, 0, regno, bi)
{
- bitmap_clear_range (tmp,
- DF_DEFS_BEGIN (regno),
+ bitmap_clear_range (tmp,
+ DF_DEFS_BEGIN (regno),
DF_DEFS_COUNT (regno));
}
bitmap_and_compl_into (tmp, kill);
BITMAP_FREE (out);
bb_info->out = tmp;
}
- else
+ else
BITMAP_FREE (tmp);
return changed;
}
{
free_alloc_pool (df_rd->block_pool);
bitmap_obstack_release (&problem_data->rd_bitmaps);
-
+
df_rd->block_info_size = 0;
free (df_rd->block_info);
free (df_rd->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)
+
+ if (!df_rd->block_info)
return;
fprintf (file, ";; Reaching defs:\n\n");
for (regno = 0; regno < m; regno++)
if (DF_DEFS_COUNT (regno))
- fprintf (file, "%d[%d,%d] ", regno,
- DF_DEFS_BEGIN (regno),
+ fprintf (file, "%d[%d,%d] ", regno,
+ DF_DEFS_BEGIN (regno),
DF_DEFS_COUNT (regno));
fprintf (file, "\n");
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));
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);
}
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_rd_confluence_n, /* Confluence operator n. */
+ 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. */
NULL, /* Incremental solution verify start. */
NULL, /* Incremental solution verify end. */
NULL, /* Dependent problem. */
- TV_DF_RD, /* Timing variable. */
+ TV_DF_RD, /* Timing variable. */
true /* 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. */
+/* Create a new RD instance and add it to the existing instance
+ of DF. */
void
df_rd_add_problem (void)
/* Set basic block info. */
static void
-df_lr_set_bb_info (unsigned int index,
+df_lr_set_bb_info (unsigned int index,
struct df_lr_bb_info *bb_info)
{
gcc_assert (df_lr);
df_lr->block_info[index] = bb_info;
}
-
+
/* Free basic block info. */
static void
-df_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
+df_lr_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;
/* Allocate or reset bitmaps for DF_LR blocks. The solution bits are
not touched unless the block is new. */
-static void
+static void
df_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
if (!df_lr->block_pool)
- df_lr->block_pool = create_alloc_pool ("df_lr_block pool",
+ df_lr->block_pool = create_alloc_pool ("df_lr_block pool",
sizeof (struct df_lr_bb_info), 50);
df_grow_bb_info (df_lr);
{
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);
}
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);
/* Reset the global solution for recalculation. */
-static void
+static void
df_lr_reset (bitmap all_blocks)
{
unsigned int bb_index;
{
unsigned int uid = INSN_UID (insn);
- if (!INSN_P (insn))
- continue;
+ if (!NONDEBUG_INSN_P (insn))
+ continue;
for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
{
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++)
{
unsigned int bb_index;
bitmap_iterator 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. */
/* 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);
}
-
+
EXECUTE_IF_SET_IN_BITMAP (df_lr->out_of_date_transfer_functions, 0, bb_index, bi)
{
if (bb_index == EXIT_BLOCK)
/* Initialize the solution vectors. */
-static void
+static void
df_lr_init (bitmap all_blocks)
{
unsigned int bb_index;
bitmap op1 = df_lr_get_bb_info (bb->index)->out;
if (bb != EXIT_BLOCK_PTR)
bitmap_copy (op1, df->hardware_regs_used);
-}
+}
/* Confluence function that ignores fake edges. */
{
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. */
bitmap_ior_into (op1, op2);
bitmap_ior_into (op1, df->hardware_regs_used);
-}
+}
/* Transfer function. */
}
}
free_alloc_pool (df_lr->block_pool);
-
+
df_lr->block_info_size = 0;
free (df_lr->block_info);
}
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)
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. */
struct df_lr_problem_data *problem_data;
if (!bb_info || !bb_info->out)
return;
-
+
fprintf (file, ";; lr out \t");
df_print_regset (file, bb_info->out);
if (df_lr->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
return;
}
- /* Set it true so that the solution is recomputed. */
+ /* Set it true so that the solution is recomputed. */
df_lr->solutions_dirty = true;
problem_data = XNEW (struct df_lr_problem_data);
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_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. */
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. */
+ TV_DF_LR, /* Timing variable. */
false /* Reset blocks on dropping out of blocks_to_analyze. */
};
/* 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,
+ if (!bitmap_bit_p (df_lr->out_of_date_transfer_functions,
bb->index))
{
bitmap_copy (saved_def, bb_info->def);
/* 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,
+ gcc_assert (bitmap_bit_p (df_lr->out_of_date_transfer_functions,
bb->index));
}
/* Make sure no one created a block without following
}
/* 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));
+ gcc_assert (!bitmap_intersect_compl_p (df_lr->out_of_date_transfer_functions,
+ all_blocks));
BITMAP_FREE (saved_def);
BITMAP_FREE (saved_use);
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.
+ and the must-initialized problem.
----------------------------------------------------------------------------*/
/* Private data used to verify the solution for this problem. */
/* Set basic block info. */
static void
-df_live_set_bb_info (unsigned int index,
+df_live_set_bb_info (unsigned int index,
struct df_live_bb_info *bb_info)
{
gcc_assert (df_live);
/* Free basic block info. */
static void
-df_live_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
+df_live_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
struct df_live_bb_info *bb_info = (struct df_live_bb_info *) vbb_info;
/* Allocate or reset bitmaps for DF_LIVE blocks. The solution bits are
not touched unless the block is new. */
-static void
+static void
df_live_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
bitmap_iterator bi;
if (!df_live->block_pool)
- df_live->block_pool = create_alloc_pool ("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);
{
struct df_live_bb_info *bb_info = df_live_get_bb_info (bb_index);
if (bb_info)
- {
+ {
bitmap_clear (bb_info->kill);
bitmap_clear (bb_info->gen);
}
else
- {
+ {
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);
/* Reset the global solution for recalculation. */
-static void
+static void
df_live_reset (bitmap all_blocks)
{
unsigned int bb_index;
df_grow_insn_info ();
- EXECUTE_IF_SET_IN_BITMAP (df_live->out_of_date_transfer_functions,
+ EXECUTE_IF_SET_IN_BITMAP (df_live->out_of_date_transfer_functions,
0, bb_index, bi)
{
df_live_bb_local_compute (bb_index);
/* Initialize the solution vectors. */
-static void
+static void
df_live_init (bitmap all_blocks)
{
unsigned int bb_index;
{
bitmap op1 = df_live_get_bb_info (e->dest->index)->in;
bitmap op2 = df_live_get_bb_info (e->src->index)->out;
-
- if (e->flags & EDGE_FAKE)
+
+ if (e->flags & EDGE_FAKE)
return;
bitmap_ior_into (op1, op2);
-}
+}
/* Transfer function for the forwards must-initialized problem. */
bitmap gen = bb_info->gen;
bitmap kill = bb_info->kill;
- /* 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. */
+ /* We need to use a scratch set here so that the value returned from this
+ function invocation properly reflects whether 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. */
{
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;
}
}
if (df_live->block_info)
{
unsigned int i;
-
+
for (i = 0; i < df_live->block_info_size; i++)
{
struct df_live_bb_info *bb_info = df_live_get_bb_info (i);
BITMAP_FREE (bb_info->out);
}
}
-
+
free_alloc_pool (df_live->block_pool);
df_live->block_info_size = 0;
free (df_live->block_info);
if (!bb_info || !bb_info->in)
return;
-
+
fprintf (file, ";; live in \t");
df_print_regset (file, bb_info->in);
if (df_live->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)
return;
}
- /* Set it true so that the solution is recomputed. */
+ /* Set it true so that the solution is recomputed. */
df_live->solutions_dirty = true;
problem_data = XNEW (struct df_live_problem_data);
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. */
+ 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. */
{
basic_block bb;
FOR_ALL_BB (bb)
- bitmap_set_bit (df_live->out_of_date_transfer_functions,
+ bitmap_set_bit (df_live->out_of_date_transfer_functions,
bb->index);
}
/* 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,
+ if (!bitmap_bit_p (df_live->out_of_date_transfer_functions,
bb->index))
{
bitmap_copy (saved_gen, bb_info->gen);
/* 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,
+ gcc_assert (bitmap_bit_p (df_live->out_of_date_transfer_functions,
bb->index));
}
/* Make sure no one created a block without following
}
/* 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));
+ 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);
{
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;
/* Delete any du or ud chains that start at REF and point to
- TARGET. */
+ TARGET. */
static void
df_chain_unlink_1 (df_ref ref, df_ref target)
{
/* Copy the du or ud chain starting at FROM_REF and attach it to
- TO_REF. */
+ TO_REF. */
-void
-df_chain_copy (df_ref to_ref,
+void
+df_chain_copy (df_ref to_ref,
struct df_link *from_ref)
{
while (from_ref)
bitmap_iterator bi;
unsigned int bb_index;
- /* Wholesale destruction of the old chains. */
+ /* Wholesale destruction of the old chains. */
if (df_chain->block_pool)
free_alloc_pool (df_chain->block_pool);
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))
/* Create def-use or use-def chains. */
-static void
+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",
+ df_chain->block_pool = create_alloc_pool ("df_chain_block pool",
sizeof (struct df_link), 50);
df_chain->optional_p = true;
}
{
bitmap_iterator bi;
unsigned int def_index;
-
+
while (*use_rec)
{
df_ref use = *use_rec;
{
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)
{
df_ref def;
- if (def_index > last_index)
+ 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);
#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_get_artificial_uses (bb->index),
DF_REF_AT_TOP);
#endif
df_rd_simulate_artificial_defs_at_top (bb, cpy);
-
+
/* Process the regular instructions next. */
FOR_BB_INSNS (bb, insn)
if (INSN_P (insn))
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),
+ df_get_artificial_uses (bb->index),
0);
BITMAP_FREE (cpy);
{
unsigned int bb_index;
bitmap_iterator bi;
-
+
EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
{
df_chain_create_bb (bb_index);
df_ref *def_rec = df_get_artificial_defs (bb->index);
if (*def_rec)
{
-
+
fprintf (file, ";; DU chains for artificial defs\n");
while (*def_rec)
{
fprintf (file, "\n");
def_rec++;
}
- }
+ }
FOR_BB_INSNS (bb, insn)
{
def_rec = DF_INSN_INFO_DEFS (insn_info);
if (*def_rec)
{
- fprintf (file, ";; DU chains for insn luid %d uid %d\n",
+ fprintf (file, ";; DU chains for insn luid %d uid %d\n",
DF_INSN_INFO_LUID (insn_info), INSN_UID (insn));
-
+
while (*def_rec)
{
df_ref def = *def_rec;
fprintf (file, "\n");
use_rec++;
}
- }
+ }
FOR_BB_INSNS (bb, insn)
{
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",
+ fprintf (file, ";; UD chains for insn luid %d uid %d\n",
DF_INSN_INFO_LUID (insn_info), INSN_UID (insn));
-
+
while (*use_rec)
{
df_ref use = *use_rec;
NULL, /* Local compute function. */
NULL, /* Init the solution specific data. */
NULL, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- NULL, /* Confluence operator n. */
+ 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. */
bitmap needs_expansion;
/* The start position and len for each regno in the various bit
- vectors. */
- unsigned int* regno_start;
+ vectors. */
+ unsigned int* regno_start;
unsigned int* regno_len;
/* An obstack for the bitmaps we need for this problem. */
bitmap_obstack byte_lr_bitmaps;
/* Get the starting location for REGNO in the df_byte_lr bitmaps. */
-int
+int
df_byte_lr_get_regno_start (unsigned int regno)
{
- struct df_byte_lr_problem_data *problem_data
+ 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 the len for REGNO in the df_byte_lr bitmaps. */
-int
+int
df_byte_lr_get_regno_len (unsigned int regno)
-{
- struct df_byte_lr_problem_data *problem_data
+{
+ 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_byte_lr_set_bb_info (unsigned int index,
+df_byte_lr_set_bb_info (unsigned int index,
struct df_byte_lr_bb_info *bb_info)
{
gcc_assert (df_byte_lr);
df_byte_lr->block_info[index] = bb_info;
}
-
+
/* Free basic block info. */
static void
-df_byte_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
+df_byte_lr_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
void *vbb_info)
{
struct df_byte_lr_bb_info *bb_info = (struct df_byte_lr_bb_info *) vbb_info;
static void
df_byte_lr_check_regs (df_ref *ref_rec)
{
- struct df_byte_lr_problem_data *problem_data
+ struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
for (; *ref_rec; ref_rec++)
{
df_ref ref = *ref_rec;
- if (DF_REF_FLAGS_IS_SET (ref, DF_REF_SIGN_EXTRACT
- | DF_REF_ZERO_EXTRACT
+ 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));
}
-/* Expand bitmap SRC which is indexed by regno to DEST which is indexed by
+/* 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 *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
bitmap_iterator bi;
unsigned int i;
bitmap_clear (dest);
EXECUTE_IF_SET_IN_BITMAP (src, 0, i, bi)
{
- bitmap_set_range (dest, problem_data->regno_start[i],
+ bitmap_set_range (dest, problem_data->regno_start[i],
problem_data->regno_len[i]);
}
}
/* Allocate or reset bitmaps for DF_BYTE_LR blocks. The solution bits are
not touched unless the block is new. */
-static void
+static void
df_byte_lr_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
unsigned int bb_index;
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);
+ struct df_byte_lr_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",
+ 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);
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);
-
+
/* Discover which regno's use subregs, extracts or
strict_low_parts. */
FOR_EACH_BB (bb)
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++)
{
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
+ else
len = 1;
-
+
problem_data->regno_len[regno] = len;
index += len;
}
- df_byte_lr_expand_bitmap (problem_data->hardware_regs_used,
+ 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_byte_lr_expand_bitmap (problem_data->invalidated_by_call,
regs_invalidated_by_call_regset);
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
- {
+ {
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->out = BITMAP_ALLOC (&problem_data->byte_lr_bitmaps);
}
}
-
+
df_byte_lr->optional_p = true;
}
/* Reset the global solution for recalculation. */
-static void
+static void
df_byte_lr_reset (bitmap all_blocks)
{
unsigned int bb_index;
static void
df_byte_lr_bb_local_compute (unsigned int bb_index)
{
- struct df_byte_lr_problem_data *problem_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);
unsigned int uid = INSN_UID (insn);
if (!INSN_P (insn))
- continue;
+ continue;
for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
{
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++)
/* Initialize the solution vectors. */
-static void
+static void
df_byte_lr_init (bitmap all_blocks)
{
unsigned int bb_index;
static void
df_byte_lr_confluence_0 (basic_block bb)
{
- struct df_byte_lr_problem_data *problem_data
+ 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_byte_lr_confluence_n (edge e)
{
- struct df_byte_lr_problem_data *problem_data
+ 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;
-
+
/* 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. */
bitmap_ior_into (op1, op2);
bitmap_ior_into (op1, problem_data->hardware_regs_used);
-}
+}
/* Transfer function. */
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, ";; 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);
-}
+}
/* Debugging info at bottom of bb. */
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. */
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_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. */
NULL, /* Incremental solution verify start. */
NULL, /* Incremental solution verify end. */
NULL, /* Dependent problem. */
- TV_DF_BYTE_LR, /* Timing variable. */
+ TV_DF_BYTE_LR, /* Timing variable. */
false /* Reset blocks on dropping out of blocks_to_analyze. */
};
void
df_byte_lr_simulate_defs (rtx insn, bitmap live)
{
- struct df_byte_lr_problem_data *problem_data
+ struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
df_ref *def_rec;
unsigned int uid = INSN_UID (insn);
bitmap_clear_range (live, start, len);
}
}
-}
+}
/* Simulate the effects of the uses of INSN on LIVE. */
-void
+void
df_byte_lr_simulate_uses (rtx insn, bitmap live)
{
- struct df_byte_lr_problem_data *problem_data
+ struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
df_ref *use_rec;
unsigned int uid = INSN_UID (insn);
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))
{
start += sb;
len = lb - sb;
}
-
+
/* Add use to set of uses in this BB. */
if (len)
bitmap_set_range (live, start, len);
/* Apply the artificial uses and defs at the top of BB in a forwards
direction. */
-void
+void
df_byte_lr_simulate_artificial_refs_at_top (basic_block bb, bitmap live)
{
- struct df_byte_lr_problem_data *problem_data
+ struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
df_ref *def_rec;
#ifdef EH_USES
df_ref *use_rec;
#endif
int bb_index = bb->index;
-
+
#ifdef EH_USES
for (use_rec = df_get_artificial_uses (bb_index); *use_rec; use_rec++)
{
{
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];
/* Apply the artificial uses and defs at the end of BB in a backwards
direction. */
-void
+void
df_byte_lr_simulate_artificial_refs_at_end (basic_block bb, bitmap live)
{
- struct df_byte_lr_problem_data *problem_data
+ struct df_byte_lr_problem_data *problem_data
= (struct df_byte_lr_problem_data *)df_byte_lr->problem_data;
df_ref *def_rec;
df_ref *use_rec;
int bb_index = bb->index;
-
+
for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
This problem computes REG_DEAD and REG_UNUSED notes.
----------------------------------------------------------------------------*/
-static void
+static void
df_note_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
{
df_note->optional_p = true;
}
#ifdef REG_DEAD_DEBUGGING
-static void
+static void
df_print_note (const char *prefix, rtx insn, rtx note)
{
if (dump_file)
just leave the notes alone. */
#ifdef STACK_REGS
-static inline bool
+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
+static inline bool
df_ignore_stack_reg (int regno ATTRIBUTE_UNUSED)
{
return false;
switch (REG_NOTE_KIND (link))
{
case REG_DEAD:
- /* After reg-stack, we need to ignore any unused notes
+ /* After reg-stack, we need to ignore any unused notes
for the stack registers. */
if (df_ignore_stack_reg (REGNO (XEXP (link, 0))))
{
break;
case REG_UNUSED:
- /* After reg-stack, we need to ignore any unused notes
+ /* After reg-stack, we need to ignore any unused notes
for the stack registers. */
if (df_ignore_stack_reg (REGNO (XEXP (link, 0))))
{
*pprev = link = next;
}
break;
-
+
default:
pprev = &XEXP (link, 1);
link = *pprev;
rtx curr = old;
rtx prev = NULL;
+ gcc_assert (!DEBUG_INSN_P (insn));
+
while (curr)
if (XEXP (curr, 0) == reg)
{
prev = curr;
curr = XEXP (curr, 1);
}
-
+
/* Did not find the note. */
add_reg_note (insn, note_type, reg);
return old;
static rtx
df_set_unused_notes_for_mw (rtx insn, rtx old, struct df_mw_hardreg *mws,
- bitmap live, bitmap do_not_gen,
+ 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",
+ fprintf (dump_file, "mw_set_unused looking at mws[%d..%d]\n",
mws->start_regno, mws->end_regno);
#endif
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)
+ bitmap artificial_uses, bool *added_notes_p)
{
unsigned int r;
-
+ bool is_debug = *added_notes_p;
+
+ *added_notes_p = false;
+
#ifdef REG_DEAD_DEBUGGING
if (dump_file)
{
- fprintf (dump_file, "mw_set_dead looking at mws[%d..%d]\n do_not_gen =",
+ 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 =");
if (df_whole_mw_reg_dead_p (mws, live, artificial_uses, do_not_gen))
{
/* Add a dead note for the entire multi word register. */
+ if (is_debug)
+ {
+ *added_notes_p = true;
+ return old;
+ }
old = df_set_note (REG_DEAD, insn, old, mws->mw_reg);
#ifdef REG_DEAD_DEBUGGING
df_print_note ("adding 1: ", insn, REG_NOTES (insn));
&& !bitmap_bit_p (artificial_uses, r)
&& !bitmap_bit_p (do_not_gen, r))
{
+ if (is_debug)
+ {
+ *added_notes_p = true;
+ return old;
+ }
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));
LIVE. Do not generate notes for registers in ARTIFICIAL_USES. */
static rtx
-df_create_unused_note (rtx insn, rtx old, df_ref def,
+df_create_unused_note (rtx insn, rtx old, df_ref def,
bitmap live, bitmap artificial_uses)
{
unsigned int dregno = DF_REF_REGNO (def);
-
+
#ifdef REG_DEAD_DEBUGGING
if (dump_file)
{
|| bitmap_bit_p (artificial_uses, dregno)
|| df_ignore_stack_reg (dregno)))
{
- rtx reg = (DF_REF_LOC (def))
+ 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;
}
+/* Node of a linked list of uses of dead REGs in debug insns. */
+struct dead_debug_use
+{
+ df_ref use;
+ struct dead_debug_use *next;
+};
+
+/* Linked list of the above, with a bitmap of the REGs in the
+ list. */
+struct dead_debug
+{
+ struct dead_debug_use *head;
+ bitmap used;
+};
+
+/* Initialize DEBUG to an empty list, and clear USED, if given. */
+static inline void
+dead_debug_init (struct dead_debug *debug, bitmap used)
+{
+ debug->head = NULL;
+ debug->used = used;
+ if (used)
+ bitmap_clear (used);
+}
+
+/* Reset all debug insns with pending uses. Release the bitmap in it,
+ unless it is USED. USED must be the same bitmap passed to
+ dead_debug_init. */
+static inline void
+dead_debug_finish (struct dead_debug *debug, bitmap used)
+{
+ struct dead_debug_use *head;
+ rtx insn = NULL;
+
+ if (debug->used != used)
+ BITMAP_FREE (debug->used);
+
+ while ((head = debug->head))
+ {
+ insn = DF_REF_INSN (head->use);
+ if (!head->next || DF_REF_INSN (head->next->use) != insn)
+ {
+ INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC ();
+ df_insn_rescan_debug_internal (insn);
+ }
+ debug->head = head->next;
+ XDELETE (head);
+ }
+}
+
+/* Add USE to DEBUG. It must be a dead reference to UREGNO in a debug
+ insn. Create a bitmap for DEBUG as needed. */
+static inline void
+dead_debug_add (struct dead_debug *debug, df_ref use, unsigned int uregno)
+{
+ struct dead_debug_use *newddu = XNEW (struct dead_debug_use);
+
+ newddu->use = use;
+ newddu->next = debug->head;
+ debug->head = newddu;
+
+ if (!debug->used)
+ debug->used = BITMAP_ALLOC (NULL);
+
+ bitmap_set_bit (debug->used, uregno);
+}
+
+/* If UREGNO is referenced by any entry in DEBUG, emit a debug insn
+ before INSN that binds the REG to a debug temp, and replace all
+ uses of UREGNO in DEBUG with uses of the debug temp. INSN must be
+ the insn where UREGNO dies. */
+static inline void
+dead_debug_insert_before (struct dead_debug *debug, unsigned int uregno,
+ rtx insn)
+{
+ struct dead_debug_use **tailp = &debug->head;
+ struct dead_debug_use *cur;
+ struct dead_debug_use *uses = NULL;
+ struct dead_debug_use **usesp = &uses;
+ rtx reg = NULL;
+ rtx dval;
+ rtx bind;
+
+ if (!debug->used || !bitmap_clear_bit (debug->used, uregno))
+ return;
+
+ /* Move all uses of uregno from debug->head to uses, setting mode to
+ the widest referenced mode. */
+ while ((cur = *tailp))
+ {
+ if (DF_REF_REGNO (cur->use) == uregno)
+ {
+ *usesp = cur;
+ usesp = &cur->next;
+ *tailp = cur->next;
+ cur->next = NULL;
+ if (!reg
+ || (GET_MODE_BITSIZE (GET_MODE (reg))
+ < GET_MODE_BITSIZE (GET_MODE (DF_REF_REAL_REG (cur->use)))))
+ reg = DF_REF_REAL_REG (cur->use);
+ }
+ else
+ tailp = &(*tailp)->next;
+ }
+
+ gcc_assert (reg);
+
+ /* Create DEBUG_EXPR (and DEBUG_EXPR_DECL). */
+ dval = make_debug_expr_from_rtl (reg);
+
+ /* Emit a debug bind insn before the insn in which reg dies. */
+ bind = gen_rtx_VAR_LOCATION (GET_MODE (reg),
+ DEBUG_EXPR_TREE_DECL (dval), reg,
+ VAR_INIT_STATUS_INITIALIZED);
+
+ bind = emit_debug_insn_before (bind, insn);
+ df_insn_rescan (bind);
+
+ /* Adjust all uses. */
+ while ((cur = uses))
+ {
+ if (GET_MODE (DF_REF_REAL_REG (cur->use)) == GET_MODE (reg))
+ *DF_REF_REAL_LOC (cur->use) = dval;
+ else
+ *DF_REF_REAL_LOC (cur->use)
+ = gen_lowpart_SUBREG (GET_MODE (DF_REF_REAL_REG (cur->use)), dval);
+ /* ??? Should we simplify subreg of subreg? */
+ df_insn_rescan (DF_REF_INSN (cur->use));
+ uses = cur->next;
+ XDELETE (cur);
+ }
+}
/* 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_note_bb_compute (unsigned int bb_index,
+df_note_bb_compute (unsigned int bb_index,
bitmap live, bitmap do_not_gen, bitmap artificial_uses)
{
basic_block bb = BASIC_BLOCK (bb_index);
rtx insn;
df_ref *def_rec;
df_ref *use_rec;
+ struct dead_debug debug;
+
+ dead_debug_init (&debug, NULL);
bitmap_copy (live, df_get_live_out (bb));
bitmap_clear (artificial_uses);
{
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)
{
struct df_mw_hardreg **mws_rec;
rtx old_dead_notes;
rtx old_unused_notes;
-
+ int debug_insn;
+
if (!INSN_P (insn))
continue;
+ debug_insn = DEBUG_INSN_P (insn);
+
bitmap_clear (do_not_gen);
df_kill_notes (insn, &old_dead_notes, &old_unused_notes);
mws_rec = DF_INSN_UID_MWS (uid);
while (*mws_rec)
{
- struct df_mw_hardreg *mws = *mws_rec;
- if ((DF_MWS_REG_DEF_P (mws))
+ struct df_mw_hardreg *mws = *mws_rec;
+ if ((DF_MWS_REG_DEF_P (mws))
&& !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,
+ old_unused_notes
+ = df_set_unused_notes_for_mw (insn, old_unused_notes,
+ mws, live, do_not_gen,
artificial_uses);
mws_rec++;
}
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,
+ = df_create_unused_note (insn, old_unused_notes,
def, live, artificial_uses);
bitmap_set_bit (do_not_gen, dregno);
}
mws_rec = DF_INSN_UID_MWS (uid);
while (*mws_rec)
{
- struct df_mw_hardreg *mws = *mws_rec;
+ struct df_mw_hardreg *mws = *mws_rec;
if (DF_MWS_REG_DEF_P (mws))
old_unused_notes
- = df_set_unused_notes_for_mw (insn, old_unused_notes,
- mws, live, do_not_gen,
+ = df_set_unused_notes_for_mw (insn, old_unused_notes,
+ mws, live, do_not_gen,
artificial_uses);
mws_rec++;
}
df_ref def = *def_rec;
unsigned int dregno = DF_REF_REGNO (def);
old_unused_notes
- = df_create_unused_note (insn, 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_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 ((DF_MWS_REG_DEF_P (mws))
+ struct df_mw_hardreg *mws = *mws_rec;
+ if ((DF_MWS_REG_DEF_P (mws))
&& !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);
+ {
+ bool really_add_notes = debug_insn != 0;
+
+ old_dead_notes
+ = df_set_dead_notes_for_mw (insn, old_dead_notes,
+ mws, live, do_not_gen,
+ artificial_uses,
+ &really_add_notes);
+
+ if (really_add_notes)
+ debug_insn = -1;
+ }
mws_rec++;
}
unsigned int uregno = DF_REF_REGNO (use);
#ifdef REG_DEAD_DEBUGGING
- if (dump_file)
+ if (dump_file && !debug_insn)
{
fprintf (dump_file, " regular looking at use ");
df_ref_debug (use, dump_file);
#endif
if (!bitmap_bit_p (live, uregno))
{
+ if (debug_insn)
+ {
+ if (debug_insn > 0)
+ dead_debug_add (&debug, use, uregno);
+ break;
+ }
+ else
+ dead_debug_insert_before (&debug, uregno, insn);
+
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))
+ 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);
free_EXPR_LIST_node (old_dead_notes);
old_dead_notes = next;
}
+
+ if (debug_insn == -1)
+ {
+ /* ??? We could probably do better here, replacing dead
+ registers with their definitions. */
+ INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC ();
+ df_insn_rescan_debug_internal (insn);
+ }
}
+
+ dead_debug_finish (&debug, NULL);
}
df_note_compute, /* Local compute function. */
NULL, /* Init the solution specific data. */
NULL, /* Iterative solver. */
- NULL, /* Confluence operator 0. */
- NULL, /* Confluence operator n. */
+ NULL, /* Confluence operator 0. */
+ NULL, /* Confluence operator n. */
NULL, /* Transfer function. */
NULL, /* Finalize function. */
df_note_free, /* Free all of the problem information. */
\f
/*----------------------------------------------------------------------------
- Functions for simulating the effects of single insns.
+ 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.
+ block. If you go backwards, defs are examined first to clear bits,
+ then uses are examined to set bits. If you go forwards, defs are
+ examined first to set bits, then REG_DEAD and REG_UNUSED notes
+ are examined to clear bits. In either case, the result of examining
+ a def can be undone (respectively by a use or a REG_UNUSED note).
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
for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
{
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));
+ }
+}
+
+/* Find the set of real DEFs, which are not clobbers, for INSN. */
+
+void
+df_simulate_find_noclobber_defs (rtx insn, bitmap defs)
+{
+ df_ref *def_rec;
+ unsigned int uid = INSN_UID (insn);
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ df_ref def = *def_rec;
+ if (!(DF_REF_FLAGS (def) & (DF_REF_MUST_CLOBBER | DF_REF_MAY_CLOBBER)))
bitmap_set_bit (defs, DF_REF_REGNO (def));
}
}
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
+void
df_simulate_uses (rtx insn, bitmap live)
{
df_ref *use_rec;
unsigned int uid = INSN_UID (insn);
+ if (DEBUG_INSN_P (insn))
+ return;
+
for (use_rec = DF_INSN_UID_USES (uid); *use_rec; use_rec++)
{
df_ref use = *use_rec;
df_simulate_initialize_backwards should be called first with a
bitvector copyied from the DF_LIVE_OUT or DF_LR_OUT. Then
df_simulate_one_insn_backwards should be called for each insn in
- the block, starting with the last on. Finally,
+ the block, starting with the last one. Finally,
df_simulate_finalize_backwards can be called to get a new value
of the sets at the top of the block (this is rarely used).
----------------------------------------------------------------------------*/
/* Apply the artificial uses and defs at the end of BB in a backwards
direction. */
-void
+void
df_simulate_initialize_backwards (basic_block bb, bitmap live)
{
df_ref *def_rec;
df_ref *use_rec;
int bb_index = bb->index;
-
+
for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
/* Simulate the backwards effects of INSN on the bitmap LIVE. */
-void
+void
df_simulate_one_insn_backwards (basic_block bb, rtx insn, bitmap live)
{
- if (! INSN_P (insn))
- return;
-
+ if (!NONDEBUG_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
+void
df_simulate_finalize_backwards (basic_block bb, bitmap live)
{
df_ref *def_rec;
df_ref *use_rec;
#endif
int bb_index = bb->index;
-
+
for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
/*----------------------------------------------------------------------------
The following three functions are used only for FORWARDS scanning:
i.e. they process the defs and the REG_DEAD and REG_UNUSED notes.
- Thus it is important to add the DF_NOTES problem to the stack of
+ Thus it is important to add the DF_NOTES problem to the stack of
problems computed before using these functions.
df_simulate_initialize_forwards should be called first with a
bitvector copyied from the DF_LIVE_IN or DF_LR_IN. Then
df_simulate_one_insn_forwards should be called for each insn in
- the block, starting with the last on. Finally,
- df_simulate_finalize_forwards can be called to get a new value
- of the sets at the bottom of the block (this is rarely used).
+ the block, starting with the first one.
----------------------------------------------------------------------------*/
-/* Apply the artificial uses and defs at the top of BB in a backwards
- direction. */
+/* Initialize the LIVE bitmap, which should be copied from DF_LIVE_IN or
+ DF_LR_IN for basic block BB, for forward scanning by marking artificial
+ defs live. */
-void
+void
df_simulate_initialize_forwards (basic_block bb, bitmap live)
{
df_ref *def_rec;
int bb_index = bb->index;
-
+
for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
if (DF_REF_FLAGS (def) & DF_REF_AT_TOP)
- bitmap_clear_bit (live, DF_REF_REGNO (def));
+ bitmap_set_bit (live, DF_REF_REGNO (def));
}
}
-/* Simulate the backwards effects of INSN on the bitmap LIVE. */
+/* Simulate the forwards effects of INSN on the bitmap LIVE. */
-void
+void
df_simulate_one_insn_forwards (basic_block bb, rtx insn, bitmap live)
{
rtx link;
if (! INSN_P (insn))
- return;
+ return;
- /* Make sure that the DF_NOTES really is an active df problem. */
+ /* Make sure that DF_NOTE really is an active df problem. */
gcc_assert (df_note);
- df_simulate_defs (insn, live);
+ /* Note that this is the opposite as how the problem is defined, because
+ in the LR problem defs _kill_ liveness. However, they do so backwards,
+ while here the scan is performed forwards! So, first assume that the
+ def is live, and if this is not true REG_UNUSED notes will rectify the
+ situation. */
+ df_simulate_find_noclobber_defs (insn, live);
/* Clear all of the registers that go dead. */
for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
{
switch (REG_NOTE_KIND (link))
+ {
case REG_DEAD:
case REG_UNUSED:
- {
- rtx reg = XEXP (link, 0);
- int regno = REGNO (reg);
- if (regno < FIRST_PSEUDO_REGISTER)
- {
- int n = hard_regno_nregs[regno][GET_MODE (reg)];
- while (--n >= 0)
- bitmap_clear_bit (live, regno + n);
- }
- else
- bitmap_clear_bit (live, regno);
+ {
+ rtx reg = XEXP (link, 0);
+ int regno = REGNO (reg);
+ if (regno < FIRST_PSEUDO_REGISTER)
+ {
+ int n = hard_regno_nregs[regno][GET_MODE (reg)];
+ while (--n >= 0)
+ bitmap_clear_bit (live, regno + n);
+ }
+ else
+ bitmap_clear_bit (live, regno);
+ }
break;
default:
break;
}
-/* Apply the artificial uses and defs at the end of BB in a backwards
- direction. */
+\f
+/*----------------------------------------------------------------------------
+ MULTIPLE DEFINITIONS
+
+ Find the locations in the function reached by multiple definition sites
+ for a live pseudo. In and out bitvectors are built for each basic
+ block. They are restricted for efficiency to live registers.
+
+ The gen and kill sets for the problem are obvious. Together they
+ include all defined registers in a basic block; the gen set includes
+ registers where a partial or conditional or may-clobber definition is
+ last in the BB, while the kill set includes registers with a complete
+ definition coming last. However, the computation of the dataflow
+ itself is interesting.
+
+ The idea behind it comes from SSA form's iterated dominance frontier
+ criterion for inserting PHI functions. Just like in that case, we can use
+ the dominance frontier to find places where multiple definitions meet;
+ a register X defined in a basic block BB1 has multiple definitions in
+ basic blocks in BB1's dominance frontier.
+
+ So, the in-set of a basic block BB2 is not just the union of the
+ out-sets of BB2's predecessors, but includes some more bits that come
+ from the basic blocks of whose dominance frontier BB2 is part (BB1 in
+ the previous paragraph). I called this set the init-set of BB2.
+
+ (Note: I actually use the kill-set only to build the init-set.
+ gen bits are anyway propagated from BB1 to BB2 by dataflow).
+
+ For example, if you have
+
+ BB1 : r10 = 0
+ r11 = 0
+ if <...> goto BB2 else goto BB3;
+
+ BB2 : r10 = 1
+ r12 = 1
+ goto BB3;
-void
-df_simulate_finalize_forwards (basic_block bb, bitmap live)
+ BB3 :
+
+ you have BB3 in BB2's dominance frontier but not in BB1's, so that the
+ init-set of BB3 includes r10 and r12, but not r11. Note that we do
+ not need to iterate the dominance frontier, because we do not insert
+ anything like PHI functions there! Instead, dataflow will take care of
+ propagating the information to BB3's successors.
+ ---------------------------------------------------------------------------*/
+
+/* Scratch var used by transfer functions. This is used to do md analysis
+ only for live registers. */
+static bitmap df_md_scratch;
+
+/* Set basic block info. */
+
+static void
+df_md_set_bb_info (unsigned int index,
+ struct df_md_bb_info *bb_info)
+{
+ gcc_assert (df_md);
+ gcc_assert (index < df_md->block_info_size);
+ df_md->block_info[index] = bb_info;
+}
+
+
+static void
+df_md_free_bb_info (basic_block bb ATTRIBUTE_UNUSED,
+ void *vbb_info)
+{
+ struct df_md_bb_info *bb_info = (struct df_md_bb_info *) vbb_info;
+ if (bb_info)
+ {
+ BITMAP_FREE (bb_info->kill);
+ BITMAP_FREE (bb_info->gen);
+ BITMAP_FREE (bb_info->init);
+ BITMAP_FREE (bb_info->in);
+ BITMAP_FREE (bb_info->out);
+ pool_free (df_md->block_pool, bb_info);
+ }
+}
+
+
+/* Allocate or reset bitmaps for DF_MD. The solution bits are
+ not touched unless the block is new. */
+
+static void
+df_md_alloc (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ if (!df_md->block_pool)
+ df_md->block_pool = create_alloc_pool ("df_md_block pool",
+ sizeof (struct df_md_bb_info), 50);
+
+ df_grow_bb_info (df_md);
+ df_md_scratch = BITMAP_ALLOC (NULL);
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+ if (bb_info)
+ {
+ bitmap_clear (bb_info->init);
+ bitmap_clear (bb_info->gen);
+ bitmap_clear (bb_info->kill);
+ bitmap_clear (bb_info->in);
+ bitmap_clear (bb_info->out);
+ }
+ else
+ {
+ bb_info = (struct df_md_bb_info *) pool_alloc (df_md->block_pool);
+ df_md_set_bb_info (bb_index, bb_info);
+ bb_info->init = BITMAP_ALLOC (NULL);
+ bb_info->gen = BITMAP_ALLOC (NULL);
+ bb_info->kill = BITMAP_ALLOC (NULL);
+ bb_info->in = BITMAP_ALLOC (NULL);
+ bb_info->out = BITMAP_ALLOC (NULL);
+ }
+ }
+
+ df_md->optional_p = true;
+}
+
+/* Add the effect of the top artificial defs of BB to the multiple definitions
+ bitmap LOCAL_MD. */
+
+void
+df_md_simulate_artificial_defs_at_top (basic_block bb, bitmap local_md)
{
- df_ref *def_rec;
int bb_index = bb->index;
-
+ df_ref *def_rec;
for (def_rec = df_get_artificial_defs (bb_index); *def_rec; def_rec++)
{
df_ref def = *def_rec;
- if ((DF_REF_FLAGS (def) & DF_REF_AT_TOP) == 0)
- bitmap_clear_bit (live, DF_REF_REGNO (def));
+ 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 | DF_REF_MAY_CLOBBER))
+ bitmap_set_bit (local_md, dregno);
+ else
+ bitmap_clear_bit (local_md, dregno);
+ }
+ }
+}
+
+
+/* Add the effect of the defs of INSN to the reaching definitions bitmap
+ LOCAL_MD. */
+
+void
+df_md_simulate_one_insn (basic_block bb ATTRIBUTE_UNUSED, rtx insn,
+ bitmap local_md)
+{
+ unsigned uid = INSN_UID (insn);
+ df_ref *def_rec;
+
+ for (def_rec = DF_INSN_UID_DEFS (uid); *def_rec; def_rec++)
+ {
+ 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 | DF_REF_MAY_CLOBBER))
+ bitmap_set_bit (local_md, DF_REF_ID (def));
+ else
+ bitmap_clear_bit (local_md, DF_REF_ID (def));
+ }
+ }
+}
+
+static void
+df_md_bb_local_compute_process_def (struct df_md_bb_info *bb_info,
+ df_ref *def_rec,
+ int top_flag)
+{
+ df_ref def;
+ bitmap_clear (seen_in_insn);
+
+ while ((def = *def_rec++) != NULL)
+ {
+ unsigned int dregno = DF_REF_REGNO (def);
+ if (((!(df->changeable_flags & DF_NO_HARD_REGS))
+ || (dregno >= FIRST_PSEUDO_REGISTER))
+ && top_flag == (DF_REF_FLAGS (def) & DF_REF_AT_TOP))
+ {
+ if (!bitmap_bit_p (seen_in_insn, dregno))
+ {
+ if (DF_REF_FLAGS (def)
+ & (DF_REF_PARTIAL | DF_REF_CONDITIONAL | DF_REF_MAY_CLOBBER))
+ {
+ bitmap_set_bit (bb_info->gen, dregno);
+ bitmap_clear_bit (bb_info->kill, dregno);
+ }
+ else
+ {
+ /* When we find a clobber and a regular def,
+ make sure the regular def wins. */
+ bitmap_set_bit (seen_in_insn, dregno);
+ bitmap_set_bit (bb_info->kill, dregno);
+ bitmap_clear_bit (bb_info->gen, dregno);
+ }
+ }
+ }
+ }
+}
+
+
+/* Compute local multiple def info for basic block BB. */
+
+static void
+df_md_bb_local_compute (unsigned int bb_index)
+{
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+ rtx insn;
+
+ /* Artificials are only hard regs. */
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_md_bb_local_compute_process_def (bb_info,
+ df_get_artificial_defs (bb_index),
+ DF_REF_AT_TOP);
+
+ FOR_BB_INSNS (bb, insn)
+ {
+ unsigned int uid = INSN_UID (insn);
+ if (!INSN_P (insn))
+ continue;
+
+ df_md_bb_local_compute_process_def (bb_info, DF_INSN_UID_DEFS (uid), 0);
+ }
+
+ if (!(df->changeable_flags & DF_NO_HARD_REGS))
+ df_md_bb_local_compute_process_def (bb_info,
+ df_get_artificial_defs (bb_index),
+ 0);
+}
+
+/* Compute local reaching def info for each basic block within BLOCKS. */
+
+static void
+df_md_local_compute (bitmap all_blocks)
+{
+ unsigned int bb_index, df_bb_index;
+ bitmap_iterator bi1, bi2;
+ basic_block bb;
+ bitmap *frontiers;
+
+ seen_in_insn = BITMAP_ALLOC (NULL);
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi1)
+ {
+ df_md_bb_local_compute (bb_index);
+ }
+
+ BITMAP_FREE (seen_in_insn);
+
+ frontiers = XNEWVEC (bitmap, last_basic_block);
+ FOR_ALL_BB (bb)
+ frontiers[bb->index] = BITMAP_ALLOC (NULL);
+
+ compute_dominance_frontiers (frontiers);
+
+ /* Add each basic block's kills to the nodes in the frontier of the BB. */
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi1)
+ {
+ bitmap kill = df_md_get_bb_info (bb_index)->kill;
+ EXECUTE_IF_SET_IN_BITMAP (frontiers[bb_index], 0, df_bb_index, bi2)
+ {
+ basic_block bb = BASIC_BLOCK (df_bb_index);
+ if (bitmap_bit_p (all_blocks, df_bb_index))
+ bitmap_ior_and_into (df_md_get_bb_info (df_bb_index)->init, kill,
+ df_get_live_in (bb));
+ }
+ }
+
+ FOR_ALL_BB (bb)
+ BITMAP_FREE (frontiers[bb->index]);
+ free (frontiers);
+}
+
+
+/* Reset the global solution for recalculation. */
+
+static void
+df_md_reset (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+ gcc_assert (bb_info);
+ bitmap_clear (bb_info->in);
+ bitmap_clear (bb_info->out);
+ }
+}
+
+static bool
+df_md_transfer_function (int bb_index)
+{
+ basic_block bb = BASIC_BLOCK (bb_index);
+ struct df_md_bb_info *bb_info = df_md_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;
+
+ /* We need to use a scratch set here so that the value returned from this
+ function invocation properly reflects whether the sets changed in a
+ significant way; i.e. not just because the live set was anded in. */
+ bitmap_and (df_md_scratch, gen, df_get_live_out (bb));
+
+ /* Multiple definitions of a register are not relevant if it is not
+ live. Thus we trim the result to the places where it is live. */
+ bitmap_and_into (in, df_get_live_in (bb));
+
+ return bitmap_ior_and_compl (out, df_md_scratch, in, kill);
+}
+
+/* Initialize the solution bit vectors for problem. */
+
+static void
+df_md_init (bitmap all_blocks)
+{
+ unsigned int bb_index;
+ bitmap_iterator bi;
+
+ EXECUTE_IF_SET_IN_BITMAP (all_blocks, 0, bb_index, bi)
+ {
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb_index);
+
+ bitmap_copy (bb_info->in, bb_info->init);
+ df_md_transfer_function (bb_index);
}
}
+
+static void
+df_md_confluence_0 (basic_block bb)
+{
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb->index);
+ bitmap_copy (bb_info->in, bb_info->init);
+}
+
+/* In of target gets or of out of source. */
+
+static void
+df_md_confluence_n (edge e)
+{
+ bitmap op1 = df_md_get_bb_info (e->dest->index)->in;
+ bitmap op2 = df_md_get_bb_info (e->src->index)->out;
+
+ if (e->flags & EDGE_FAKE)
+ return;
+
+ if (e->flags & EDGE_EH)
+ bitmap_ior_and_compl_into (op1, op2, regs_invalidated_by_call_regset);
+ else
+ bitmap_ior_into (op1, op2);
+}
+
+/* Free all storage associated with the problem. */
+
+static void
+df_md_free (void)
+{
+ unsigned int i;
+ for (i = 0; i < df_md->block_info_size; i++)
+ {
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (i);
+ if (bb_info)
+ {
+ BITMAP_FREE (bb_info->kill);
+ BITMAP_FREE (bb_info->gen);
+ BITMAP_FREE (bb_info->init);
+ BITMAP_FREE (bb_info->in);
+ BITMAP_FREE (bb_info->out);
+ }
+ }
+
+ BITMAP_FREE (df_md_scratch);
+ free_alloc_pool (df_md->block_pool);
+
+ df_md->block_info_size = 0;
+ free (df_md->block_info);
+ free (df_md);
+}
+
+
+/* Debugging info at top of bb. */
+
+static void
+df_md_top_dump (basic_block bb, FILE *file)
+{
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb->index);
+ if (!bb_info || !bb_info->in)
+ return;
+
+ fprintf (file, ";; md in \t");
+ df_print_regset (file, bb_info->in);
+ fprintf (file, ";; md init \t");
+ df_print_regset (file, bb_info->init);
+ fprintf (file, ";; md gen \t");
+ df_print_regset (file, bb_info->gen);
+ fprintf (file, ";; md kill \t");
+ df_print_regset (file, bb_info->kill);
+}
+
+/* Debugging info at bottom of bb. */
+
+static void
+df_md_bottom_dump (basic_block bb, FILE *file)
+{
+ struct df_md_bb_info *bb_info = df_md_get_bb_info (bb->index);
+ if (!bb_info || !bb_info->out)
+ return;
+
+ fprintf (file, ";; md out \t");
+ df_print_regset (file, bb_info->out);
+}
+
+static struct df_problem problem_MD =
+{
+ DF_MD, /* Problem id. */
+ DF_FORWARD, /* Direction. */
+ df_md_alloc, /* Allocate the problem specific data. */
+ df_md_reset, /* Reset global information. */
+ df_md_free_bb_info, /* Free basic block info. */
+ df_md_local_compute, /* Local compute function. */
+ df_md_init, /* Init the solution specific data. */
+ df_worklist_dataflow, /* Worklist solver. */
+ df_md_confluence_0, /* Confluence operator 0. */
+ df_md_confluence_n, /* Confluence operator n. */
+ df_md_transfer_function, /* Transfer function. */
+ NULL, /* Finalize function. */
+ df_md_free, /* Free all of the problem information. */
+ df_md_free, /* Remove this problem from the stack of dataflow problems. */
+ NULL, /* Debugging. */
+ df_md_top_dump, /* Debugging start block. */
+ df_md_bottom_dump, /* Debugging end block. */
+ NULL, /* Incremental solution verify start. */
+ NULL, /* Incremental solution verify end. */
+ NULL, /* Dependent problem. */
+ TV_DF_MD, /* Timing variable. */
+ false /* Reset blocks on dropping out of blocks_to_analyze. */
+};
+
+/* Create a new MD instance and add it to the existing instance
+ of DF. */
+
+void
+df_md_add_problem (void)
+{
+ df_add_problem (&problem_MD);
+}
+
+
+
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