/* Control flow graph manipulation code for GNU compiler.
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* This file contains low level functions to manipulate the CFG and
analyze it. All other modules should not transform the data structure
#include "tree.h"
#include "rtl.h"
#include "hard-reg-set.h"
-#include "basic-block.h"
#include "regs.h"
#include "flags.h"
#include "output.h"
#include "toplev.h"
#include "tm_p.h"
#include "obstack.h"
-#include "alloc-pool.h"
#include "timevar.h"
+#include "tree-pass.h"
#include "ggc.h"
+#include "hashtab.h"
+#include "alloc-pool.h"
+#include "df.h"
+#include "cfgloop.h"
/* The obstack on which the flow graph components are allocated. */
-struct obstack flow_obstack;
-static char *flow_firstobj;
-
-/* Number of basic blocks in the current function. */
-
-int n_basic_blocks;
-
-/* First free basic block number. */
-
-int last_basic_block;
-
-/* Number of edges in the current function. */
-
-int n_edges;
-
-/* The basic block array. */
-
-varray_type basic_block_info;
-
-/* The special entry and exit blocks. */
-basic_block ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR;
-
-/* Memory alloc pool for bb member rbi. */
-alloc_pool rbi_pool;
+struct bitmap_obstack reg_obstack;
void debug_flow_info (void);
static void free_edge (edge);
-
-/* Indicate the presence of the profile. */
-enum profile_status profile_status;
\f
+#define RDIV(X,Y) (((X) + (Y) / 2) / (Y))
+
/* Called once at initialization time. */
void
init_flow (void)
{
- static int initialized;
-
+ if (!cfun->cfg)
+ cfun->cfg = GGC_CNEW (struct control_flow_graph);
n_edges = 0;
-
- if (!initialized)
- {
- gcc_obstack_init (&flow_obstack);
- flow_firstobj = obstack_alloc (&flow_obstack, 0);
- initialized = 1;
- }
- else
- {
- obstack_free (&flow_obstack, flow_firstobj);
- flow_firstobj = obstack_alloc (&flow_obstack, 0);
- }
-
- ENTRY_BLOCK_PTR = ggc_alloc_cleared (sizeof (*ENTRY_BLOCK_PTR));
+ ENTRY_BLOCK_PTR = GGC_CNEW (struct basic_block_def);
ENTRY_BLOCK_PTR->index = ENTRY_BLOCK;
- EXIT_BLOCK_PTR = ggc_alloc_cleared (sizeof (*EXIT_BLOCK_PTR));
+ EXIT_BLOCK_PTR = GGC_CNEW (struct basic_block_def);
EXIT_BLOCK_PTR->index = EXIT_BLOCK;
ENTRY_BLOCK_PTR->next_bb = EXIT_BLOCK_PTR;
EXIT_BLOCK_PTR->prev_bb = ENTRY_BLOCK_PTR;
free_edge (edge e ATTRIBUTE_UNUSED)
{
n_edges--;
- /* ggc_free (e); */
+ ggc_free (e);
}
/* Free the memory associated with the edge structures. */
{
basic_block bb;
edge e;
+ edge_iterator ei;
FOR_EACH_BB (bb)
{
- edge e = bb->succ;
-
- while (e)
- {
- edge next = e->succ_next;
-
- free_edge (e);
- e = next;
- }
-
- bb->succ = NULL;
- bb->pred = NULL;
- }
-
- e = ENTRY_BLOCK_PTR->succ;
- while (e)
- {
- edge next = e->succ_next;
-
- free_edge (e);
- e = next;
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ free_edge (e);
+ VEC_truncate (edge, bb->succs, 0);
+ VEC_truncate (edge, bb->preds, 0);
}
- EXIT_BLOCK_PTR->pred = NULL;
- ENTRY_BLOCK_PTR->succ = NULL;
+ FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs)
+ free_edge (e);
+ VEC_truncate (edge, EXIT_BLOCK_PTR->preds, 0);
+ VEC_truncate (edge, ENTRY_BLOCK_PTR->succs, 0);
- if (n_edges)
- abort ();
+ gcc_assert (!n_edges);
}
\f
/* Allocate memory for basic_block. */
alloc_block (void)
{
basic_block bb;
- bb = ggc_alloc_cleared (sizeof (*bb));
+ bb = GGC_CNEW (struct basic_block_def);
return bb;
}
-/* Create memory pool for rbi_pool. */
-
-void
-alloc_rbi_pool (void)
-{
- rbi_pool = create_alloc_pool ("rbi pool",
- sizeof (struct reorder_block_def),
- n_basic_blocks + 2);
-}
-
-/* Free rbi_pool. */
-
-void
-free_rbi_pool (void)
-{
- free_alloc_pool (rbi_pool);
-}
-
-/* Initialize rbi (the structure containing data used by basic block
- duplication and reordering) for the given basic block. */
-
-void
-initialize_bb_rbi (basic_block bb)
-{
- if (bb->rbi)
- abort ();
- bb->rbi = pool_alloc (rbi_pool);
- memset (bb->rbi, 0, sizeof (struct reorder_block_def));
-}
-
/* Link block B to chain after AFTER. */
void
link_block (basic_block b, basic_block after)
compact_blocks (void)
{
int i;
- basic_block bb;
- i = 0;
- FOR_EACH_BB (bb)
+ SET_BASIC_BLOCK (ENTRY_BLOCK, ENTRY_BLOCK_PTR);
+ SET_BASIC_BLOCK (EXIT_BLOCK, EXIT_BLOCK_PTR);
+
+ if (df)
+ df_compact_blocks ();
+ else
{
- BASIC_BLOCK (i) = bb;
- bb->index = i;
- i++;
- }
-
- if (i != n_basic_blocks)
- abort ();
-
- for (; i < last_basic_block; i++)
- BASIC_BLOCK (i) = NULL;
+ basic_block bb;
+
+ i = NUM_FIXED_BLOCKS;
+ FOR_EACH_BB (bb)
+ {
+ SET_BASIC_BLOCK (i, bb);
+ bb->index = i;
+ i++;
+ }
+ gcc_assert (i == n_basic_blocks);
+ for (; i < last_basic_block; i++)
+ SET_BASIC_BLOCK (i, NULL);
+ }
last_basic_block = n_basic_blocks;
}
expunge_block (basic_block b)
{
unlink_block (b);
- BASIC_BLOCK (b->index) = NULL;
+ SET_BASIC_BLOCK (b->index, NULL);
n_basic_blocks--;
- /* ggc_free (b); */
+ /* We should be able to ggc_free here, but we are not.
+ The dead SSA_NAMES are left pointing to dead statements that are pointing
+ to dead basic blocks making garbage collector to die.
+ We should be able to release all dead SSA_NAMES and at the same time we should
+ clear out BB pointer of dead statements consistently. */
}
\f
+/* Connect E to E->src. */
+
+static inline void
+connect_src (edge e)
+{
+ VEC_safe_push (edge, gc, e->src->succs, e);
+ df_mark_solutions_dirty ();
+}
+
+/* Connect E to E->dest. */
+
+static inline void
+connect_dest (edge e)
+{
+ basic_block dest = e->dest;
+ VEC_safe_push (edge, gc, dest->preds, e);
+ e->dest_idx = EDGE_COUNT (dest->preds) - 1;
+ df_mark_solutions_dirty ();
+}
+
+/* Disconnect edge E from E->src. */
+
+static inline void
+disconnect_src (edge e)
+{
+ basic_block src = e->src;
+ edge_iterator ei;
+ edge tmp;
+
+ for (ei = ei_start (src->succs); (tmp = ei_safe_edge (ei)); )
+ {
+ if (tmp == e)
+ {
+ VEC_unordered_remove (edge, src->succs, ei.index);
+ return;
+ }
+ else
+ ei_next (&ei);
+ }
+
+ df_mark_solutions_dirty ();
+ gcc_unreachable ();
+}
+
+/* Disconnect edge E from E->dest. */
+
+static inline void
+disconnect_dest (edge e)
+{
+ basic_block dest = e->dest;
+ unsigned int dest_idx = e->dest_idx;
+
+ VEC_unordered_remove (edge, dest->preds, dest_idx);
+
+ /* If we removed an edge in the middle of the edge vector, we need
+ to update dest_idx of the edge that moved into the "hole". */
+ if (dest_idx < EDGE_COUNT (dest->preds))
+ EDGE_PRED (dest, dest_idx)->dest_idx = dest_idx;
+ df_mark_solutions_dirty ();
+}
+
/* Create an edge connecting SRC and DEST with flags FLAGS. Return newly
created edge. Use this only if you are sure that this edge can't
possibly already exist. */
unchecked_make_edge (basic_block src, basic_block dst, int flags)
{
edge e;
- e = ggc_alloc_cleared (sizeof (*e));
+ e = GGC_CNEW (struct edge_def);
n_edges++;
- e->succ_next = src->succ;
- e->pred_next = dst->pred;
e->src = src;
e->dest = dst;
e->flags = flags;
- src->succ = e;
- dst->pred = e;
+ connect_src (e);
+ connect_dest (e);
+ execute_on_growing_pred (e);
return e;
}
edge cache CACHE. Return the new edge, NULL if already exist. */
edge
-cached_make_edge (sbitmap *edge_cache, basic_block src, basic_block dst, int flags)
+cached_make_edge (sbitmap edge_cache, basic_block src, basic_block dst, int flags)
{
- int use_edge_cache;
- edge e;
+ if (edge_cache == NULL
+ || src == ENTRY_BLOCK_PTR
+ || dst == EXIT_BLOCK_PTR)
+ return make_edge (src, dst, flags);
- /* Don't bother with edge cache for ENTRY or EXIT, if there aren't that
- many edges to them, or we didn't allocate memory for it. */
- use_edge_cache = (edge_cache
- && src != ENTRY_BLOCK_PTR && dst != EXIT_BLOCK_PTR);
-
- /* Make sure we don't add duplicate edges. */
- switch (use_edge_cache)
+ /* Does the requested edge already exist? */
+ if (! TEST_BIT (edge_cache, dst->index))
{
- default:
- /* Quick test for non-existence of the edge. */
- if (! TEST_BIT (edge_cache[src->index], dst->index))
- break;
-
- /* The edge exists; early exit if no work to do. */
- if (flags == 0)
- return NULL;
-
- /* Fall through. */
- case 0:
- for (e = src->succ; e; e = e->succ_next)
- if (e->dest == dst)
- {
- e->flags |= flags;
- return NULL;
- }
- break;
+ /* The edge does not exist. Create one and update the
+ cache. */
+ SET_BIT (edge_cache, dst->index);
+ return unchecked_make_edge (src, dst, flags);
}
- e = unchecked_make_edge (src, dst, flags);
-
- if (use_edge_cache)
- SET_BIT (edge_cache[src->index], dst->index);
+ /* At this point, we know that the requested edge exists. Adjust
+ flags if necessary. */
+ if (flags)
+ {
+ edge e = find_edge (src, dst);
+ e->flags |= flags;
+ }
- return e;
+ return NULL;
}
/* Create an edge connecting SRC and DEST with flags FLAGS. Return newly
edge
make_edge (basic_block src, basic_block dest, int flags)
{
- return cached_make_edge (NULL, src, dest, flags);
+ edge e = find_edge (src, dest);
+
+ /* Make sure we don't add duplicate edges. */
+ if (e)
+ {
+ e->flags |= flags;
+ return NULL;
+ }
+
+ return unchecked_make_edge (src, dest, flags);
}
/* Create an edge connecting SRC to DEST and set probability by knowing
/* This function will remove an edge from the flow graph. */
void
-remove_edge (edge e)
+remove_edge_raw (edge e)
{
- edge last_pred = NULL;
- edge last_succ = NULL;
- edge tmp;
- basic_block src, dest;
-
- src = e->src;
- dest = e->dest;
- for (tmp = src->succ; tmp && tmp != e; tmp = tmp->succ_next)
- last_succ = tmp;
+ remove_predictions_associated_with_edge (e);
+ execute_on_shrinking_pred (e);
- if (!tmp)
- abort ();
- if (last_succ)
- last_succ->succ_next = e->succ_next;
- else
- src->succ = e->succ_next;
-
- for (tmp = dest->pred; tmp && tmp != e; tmp = tmp->pred_next)
- last_pred = tmp;
-
- if (!tmp)
- abort ();
- if (last_pred)
- last_pred->pred_next = e->pred_next;
- else
- dest->pred = e->pred_next;
+ disconnect_src (e);
+ disconnect_dest (e);
free_edge (e);
}
void
redirect_edge_succ (edge e, basic_block new_succ)
{
- edge *pe;
+ execute_on_shrinking_pred (e);
- /* Disconnect the edge from the old successor block. */
- for (pe = &e->dest->pred; *pe != e; pe = &(*pe)->pred_next)
- continue;
- *pe = (*pe)->pred_next;
+ disconnect_dest (e);
- /* Reconnect the edge to the new successor block. */
- e->pred_next = new_succ->pred;
- new_succ->pred = e;
e->dest = new_succ;
+
+ /* Reconnect the edge to the new successor block. */
+ connect_dest (e);
+
+ execute_on_growing_pred (e);
}
/* Like previous but avoid possible duplicate edge. */
{
edge s;
- /* Check whether the edge is already present. */
- for (s = e->src->succ; s; s = s->succ_next)
- if (s->dest == new_succ && s != e)
- break;
-
- if (s)
+ s = find_edge (e->src, new_succ);
+ if (s && s != e)
{
s->flags |= e->flags;
s->probability += e->probability;
void
redirect_edge_pred (edge e, basic_block new_pred)
{
- edge *pe;
-
- /* Disconnect the edge from the old predecessor block. */
- for (pe = &e->src->succ; *pe != e; pe = &(*pe)->succ_next)
- continue;
+ disconnect_src (e);
- *pe = (*pe)->succ_next;
+ e->src = new_pred;
/* Reconnect the edge to the new predecessor block. */
- e->succ_next = new_pred->succ;
- new_pred->succ = e;
- e->src = new_pred;
+ connect_src (e);
}
-/* Clear all basic block flags, with the exception of partitioning. */
+/* Clear all basic block flags, with the exception of partitioning and
+ setjmp_target. */
void
clear_bb_flags (void)
{
basic_block bb;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
- bb->flags = BB_PARTITION (bb);
+ bb->flags = (BB_PARTITION (bb)
+ | (bb->flags & (BB_DISABLE_SCHEDULE + BB_RTL + BB_NON_LOCAL_GOTO_TARGET)));
}
\f
/* Check the consistency of profile information. We can't do that
edge e;
int sum = 0;
gcov_type lsum;
+ edge_iterator ei;
if (profile_status == PROFILE_ABSENT)
return;
if (bb != EXIT_BLOCK_PTR)
{
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
sum += e->probability;
- if (bb->succ && abs (sum - REG_BR_PROB_BASE) > 100)
+ if (EDGE_COUNT (bb->succs) && abs (sum - REG_BR_PROB_BASE) > 100)
fprintf (file, "Invalid sum of outgoing probabilities %.1f%%\n",
sum * 100.0 / REG_BR_PROB_BASE);
lsum = 0;
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
lsum += e->count;
- if (bb->succ && (lsum - bb->count > 100 || lsum - bb->count < -100))
+ if (EDGE_COUNT (bb->succs)
+ && (lsum - bb->count > 100 || lsum - bb->count < -100))
fprintf (file, "Invalid sum of outgoing counts %i, should be %i\n",
(int) lsum, (int) bb->count);
}
if (bb != ENTRY_BLOCK_PTR)
{
sum = 0;
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
sum += EDGE_FREQUENCY (e);
if (abs (sum - bb->frequency) > 100)
fprintf (file,
"Invalid sum of incoming frequencies %i, should be %i\n",
sum, bb->frequency);
lsum = 0;
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
lsum += e->count;
if (lsum - bb->count > 100 || lsum - bb->count < -100)
fprintf (file, "Invalid sum of incoming counts %i, should be %i\n",
}
}
\f
+/* Write information about registers and basic blocks into FILE.
+ This is part of making a debugging dump. */
+
void
-dump_flow_info (FILE *file)
+dump_regset (regset r, FILE *outf)
{
- int i;
- basic_block bb;
- static const char * const reg_class_names[] = REG_CLASS_NAMES;
+ unsigned i;
+ reg_set_iterator rsi;
- if (reg_n_info)
+ if (r == NULL)
{
- int max_regno = max_reg_num ();
- fprintf (file, "%d registers.\n", max_regno);
- for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
- if (REG_N_REFS (i))
- {
- enum reg_class class, altclass;
-
- fprintf (file, "\nRegister %d used %d times across %d insns",
- i, REG_N_REFS (i), REG_LIVE_LENGTH (i));
- if (REG_BASIC_BLOCK (i) >= 0)
- fprintf (file, " in block %d", REG_BASIC_BLOCK (i));
- if (REG_N_SETS (i))
- fprintf (file, "; set %d time%s", REG_N_SETS (i),
- (REG_N_SETS (i) == 1) ? "" : "s");
- if (regno_reg_rtx[i] != NULL && REG_USERVAR_P (regno_reg_rtx[i]))
- fprintf (file, "; user var");
- if (REG_N_DEATHS (i) != 1)
- fprintf (file, "; dies in %d places", REG_N_DEATHS (i));
- if (REG_N_CALLS_CROSSED (i) == 1)
- fprintf (file, "; crosses 1 call");
- else if (REG_N_CALLS_CROSSED (i))
- fprintf (file, "; crosses %d calls", REG_N_CALLS_CROSSED (i));
- if (regno_reg_rtx[i] != NULL
- && PSEUDO_REGNO_BYTES (i) != UNITS_PER_WORD)
- fprintf (file, "; %d bytes", PSEUDO_REGNO_BYTES (i));
-
- class = reg_preferred_class (i);
- altclass = reg_alternate_class (i);
- if (class != GENERAL_REGS || altclass != ALL_REGS)
- {
- if (altclass == ALL_REGS || class == ALL_REGS)
- fprintf (file, "; pref %s", reg_class_names[(int) class]);
- else if (altclass == NO_REGS)
- fprintf (file, "; %s or none", reg_class_names[(int) class]);
- else
- fprintf (file, "; pref %s, else %s",
- reg_class_names[(int) class],
- reg_class_names[(int) altclass]);
- }
-
- if (regno_reg_rtx[i] != NULL && REG_POINTER (regno_reg_rtx[i]))
- fprintf (file, "; pointer");
- fprintf (file, ".\n");
- }
+ fputs (" (nil)", outf);
+ return;
}
- fprintf (file, "\n%d basic blocks, %d edges.\n", n_basic_blocks, n_edges);
- FOR_EACH_BB (bb)
+ EXECUTE_IF_SET_IN_REG_SET (r, 0, i, rsi)
{
- edge e;
+ fprintf (outf, " %d", i);
+ if (i < FIRST_PSEUDO_REGISTER)
+ fprintf (outf, " [%s]",
+ reg_names[i]);
+ }
+}
+
+/* Print a human-readable representation of R on the standard error
+ stream. This function is designed to be used from within the
+ debugger. */
+
+void
+debug_regset (regset r)
+{
+ dump_regset (r, stderr);
+ putc ('\n', stderr);
+}
- fprintf (file, "\nBasic block %d ", bb->index);
- fprintf (file, "prev %d, next %d, ",
- bb->prev_bb->index, bb->next_bb->index);
- fprintf (file, "loop_depth %d, count ", bb->loop_depth);
+/* Emit basic block information for BB. HEADER is true if the user wants
+ the generic information and the predecessors, FOOTER is true if they want
+ the successors. FLAGS is the dump flags of interest; TDF_DETAILS emit
+ global register liveness information. PREFIX is put in front of every
+ line. The output is emitted to FILE. */
+void
+dump_bb_info (basic_block bb, bool header, bool footer, int flags,
+ const char *prefix, FILE *file)
+{
+ edge e;
+ edge_iterator ei;
+
+ if (header)
+ {
+ fprintf (file, "\n%sBasic block %d ", prefix, bb->index);
+ if (bb->prev_bb)
+ fprintf (file, ", prev %d", bb->prev_bb->index);
+ if (bb->next_bb)
+ fprintf (file, ", next %d", bb->next_bb->index);
+ fprintf (file, ", loop_depth %d, count ", bb->loop_depth);
fprintf (file, HOST_WIDEST_INT_PRINT_DEC, bb->count);
fprintf (file, ", freq %i", bb->frequency);
- if (maybe_hot_bb_p (bb))
+ /* Both maybe_hot_bb_p & probably_never_executed_bb_p functions
+ crash without cfun. */
+ if (cfun && maybe_hot_bb_p (bb))
fprintf (file, ", maybe hot");
- if (probably_never_executed_bb_p (bb))
+ if (cfun && probably_never_executed_bb_p (bb))
fprintf (file, ", probably never executed");
fprintf (file, ".\n");
- fprintf (file, "Predecessors: ");
- for (e = bb->pred; e; e = e->pred_next)
+ fprintf (file, "%sPredecessors: ", prefix);
+ FOR_EACH_EDGE (e, ei, bb->preds)
dump_edge_info (file, e, 0);
- fprintf (file, "\nSuccessors: ");
- for (e = bb->succ; e; e = e->succ_next)
- dump_edge_info (file, e, 1);
-
- fprintf (file, "\nRegisters live at start:");
- dump_regset (bb->global_live_at_start, file);
+ if ((flags & TDF_DETAILS)
+ && (bb->flags & BB_RTL)
+ && df)
+ {
+ fprintf (file, "\n");
+ df_dump_top (bb, file);
+ }
+ }
- fprintf (file, "\nRegisters live at end:");
- dump_regset (bb->global_live_at_end, file);
-
- putc ('\n', file);
+ if (footer)
+ {
+ fprintf (file, "\n%sSuccessors: ", prefix);
+ FOR_EACH_EDGE (e, ei, bb->succs)
+ dump_edge_info (file, e, 1);
- if (bb->global_live_at_start)
+ if ((flags & TDF_DETAILS)
+ && (bb->flags & BB_RTL)
+ && df)
{
- fprintf (file, "\nRegisters live at start:");
- dump_regset (bb->global_live_at_start, file);
+ fprintf (file, "\n");
+ df_dump_bottom (bb, file);
}
+ }
+
+ putc ('\n', file);
+}
+
+/* Dump the register info to FILE. */
- if (bb->global_live_at_end)
+void
+dump_reg_info (FILE *file)
+{
+ unsigned int i, max = max_reg_num ();
+ if (reload_completed)
+ return;
+
+ if (reg_info_p_size < max)
+ max = reg_info_p_size;
+
+ fprintf (file, "%d registers.\n", max);
+ for (i = FIRST_PSEUDO_REGISTER; i < max; i++)
+ {
+ enum reg_class class, altclass;
+
+ if (regstat_n_sets_and_refs)
+ fprintf (file, "\nRegister %d used %d times across %d insns",
+ i, REG_N_REFS (i), REG_LIVE_LENGTH (i));
+ else if (df)
+ fprintf (file, "\nRegister %d used %d times across %d insns",
+ i, DF_REG_USE_COUNT (i) + DF_REG_DEF_COUNT (i), REG_LIVE_LENGTH (i));
+
+ if (REG_BASIC_BLOCK (i) >= NUM_FIXED_BLOCKS)
+ fprintf (file, " in block %d", REG_BASIC_BLOCK (i));
+ if (regstat_n_sets_and_refs)
+ fprintf (file, "; set %d time%s", REG_N_SETS (i),
+ (REG_N_SETS (i) == 1) ? "" : "s");
+ else if (df)
+ fprintf (file, "; set %d time%s", DF_REG_DEF_COUNT (i),
+ (DF_REG_DEF_COUNT (i) == 1) ? "" : "s");
+ if (regno_reg_rtx[i] != NULL && REG_USERVAR_P (regno_reg_rtx[i]))
+ fprintf (file, "; user var");
+ if (REG_N_DEATHS (i) != 1)
+ fprintf (file, "; dies in %d places", REG_N_DEATHS (i));
+ if (REG_N_CALLS_CROSSED (i) == 1)
+ fprintf (file, "; crosses 1 call");
+ else if (REG_N_CALLS_CROSSED (i))
+ fprintf (file, "; crosses %d calls", REG_N_CALLS_CROSSED (i));
+ if (regno_reg_rtx[i] != NULL
+ && PSEUDO_REGNO_BYTES (i) != UNITS_PER_WORD)
+ fprintf (file, "; %d bytes", PSEUDO_REGNO_BYTES (i));
+
+ class = reg_preferred_class (i);
+ altclass = reg_alternate_class (i);
+ if (class != GENERAL_REGS || altclass != ALL_REGS)
{
- fprintf (file, "\nRegisters live at end:");
- dump_regset (bb->global_live_at_end, file);
+ if (altclass == ALL_REGS || class == ALL_REGS)
+ fprintf (file, "; pref %s", reg_class_names[(int) class]);
+ else if (altclass == NO_REGS)
+ fprintf (file, "; %s or none", reg_class_names[(int) class]);
+ else
+ fprintf (file, "; pref %s, else %s",
+ reg_class_names[(int) class],
+ reg_class_names[(int) altclass]);
}
+
+ if (regno_reg_rtx[i] != NULL && REG_POINTER (regno_reg_rtx[i]))
+ fprintf (file, "; pointer");
+ fprintf (file, ".\n");
+ }
+}
- putc ('\n', file);
+
+void
+dump_flow_info (FILE *file, int flags)
+{
+ basic_block bb;
+
+ /* There are no pseudo registers after reload. Don't dump them. */
+ if (reg_info_p_size && (flags & TDF_DETAILS) != 0)
+ dump_reg_info (file);
+
+ fprintf (file, "\n%d basic blocks, %d edges.\n", n_basic_blocks, n_edges);
+ FOR_ALL_BB (bb)
+ {
+ dump_bb_info (bb, true, true, flags, "", file);
check_bb_profile (bb, file);
}
void
debug_flow_info (void)
{
- dump_flow_info (stderr);
+ dump_flow_info (stderr, TDF_DETAILS);
}
void
dump_edge_info (FILE *file, edge e, int do_succ)
{
basic_block side = (do_succ ? e->dest : e->src);
-
- if (side == ENTRY_BLOCK_PTR)
+ /* both ENTRY_BLOCK_PTR & EXIT_BLOCK_PTR depend upon cfun. */
+ if (cfun && side == ENTRY_BLOCK_PTR)
fputs (" ENTRY", file);
- else if (side == EXIT_BLOCK_PTR)
+ else if (cfun && side == EXIT_BLOCK_PTR)
fputs (" EXIT", file);
else
fprintf (file, " %d", side->index);
alloc_aux_for_block (basic_block bb, int size)
{
/* Verify that aux field is clear. */
- if (bb->aux || !first_block_aux_obj)
- abort ();
+ gcc_assert (!bb->aux && first_block_aux_obj);
bb->aux = obstack_alloc (&block_aux_obstack, size);
memset (bb->aux, 0, size);
}
gcc_obstack_init (&block_aux_obstack);
initialized = 1;
}
+ else
+ /* Check whether AUX data are still allocated. */
+ gcc_assert (!first_block_aux_obj);
- /* Check whether AUX data are still allocated. */
- else if (first_block_aux_obj)
- abort ();
first_block_aux_obj = obstack_alloc (&block_aux_obstack, 0);
if (size)
{
void
free_aux_for_blocks (void)
{
- if (!first_block_aux_obj)
- abort ();
+ gcc_assert (first_block_aux_obj);
obstack_free (&block_aux_obstack, first_block_aux_obj);
first_block_aux_obj = NULL;
alloc_aux_for_edge (edge e, int size)
{
/* Verify that aux field is clear. */
- if (e->aux || !first_edge_aux_obj)
- abort ();
+ gcc_assert (!e->aux && first_edge_aux_obj);
e->aux = obstack_alloc (&edge_aux_obstack, size);
memset (e->aux, 0, size);
}
gcc_obstack_init (&edge_aux_obstack);
initialized = 1;
}
-
- /* Check whether AUX data are still allocated. */
- else if (first_edge_aux_obj)
- abort ();
+ else
+ /* Check whether AUX data are still allocated. */
+ gcc_assert (!first_edge_aux_obj);
first_edge_aux_obj = obstack_alloc (&edge_aux_obstack, 0);
if (size)
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR, next_bb)
{
edge e;
+ edge_iterator ei;
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
alloc_aux_for_edge (e, size);
}
}
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, EXIT_BLOCK_PTR, next_bb)
{
- for (e = bb->succ; e; e = e->succ_next)
+ edge_iterator ei;
+ FOR_EACH_EDGE (e, ei, bb->succs)
e->aux = NULL;
}
}
void
free_aux_for_edges (void)
{
- if (!first_edge_aux_obj)
- abort ();
+ gcc_assert (first_edge_aux_obj);
obstack_free (&edge_aux_obstack, first_edge_aux_obj);
first_edge_aux_obj = NULL;
dump_cfg_bb_info (FILE *file, basic_block bb)
{
unsigned i;
+ edge_iterator ei;
bool first = true;
static const char * const bb_bitnames[] =
{
- "dirty", "new", "reachable", "visited", "irreducible_loop", "superblock"
+ "new", "reachable", "irreducible_loop", "superblock",
+ "nosched", "hot", "cold", "dup", "xlabel", "rtl",
+ "fwdr", "nothrd"
};
const unsigned n_bitnames = sizeof (bb_bitnames) / sizeof (char *);
edge e;
fprintf (file, "\n");
fprintf (file, "Predecessors: ");
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
dump_edge_info (file, e, 0);
fprintf (file, "\nSuccessors: ");
- for (e = bb->succ; e; e = e->succ_next)
+ FOR_EACH_EDGE (e, ei, bb->succs)
dump_edge_info (file, e, 1);
fprintf (file, "\n\n");
}
dump_cfg_bb_info (file, bb);
}
}
+
+/* An edge originally destinating BB of FREQUENCY and COUNT has been proved to
+ leave the block by TAKEN_EDGE. Update profile of BB such that edge E can be
+ redirected to destination of TAKEN_EDGE.
+
+ This function may leave the profile inconsistent in the case TAKEN_EDGE
+ frequency or count is believed to be lower than FREQUENCY or COUNT
+ respectively. */
+void
+update_bb_profile_for_threading (basic_block bb, int edge_frequency,
+ gcov_type count, edge taken_edge)
+{
+ edge c;
+ int prob;
+ edge_iterator ei;
+
+ bb->count -= count;
+ if (bb->count < 0)
+ {
+ if (dump_file)
+ fprintf (dump_file, "bb %i count became negative after threading",
+ bb->index);
+ bb->count = 0;
+ }
+
+ /* Compute the probability of TAKEN_EDGE being reached via threaded edge.
+ Watch for overflows. */
+ if (bb->frequency)
+ prob = edge_frequency * REG_BR_PROB_BASE / bb->frequency;
+ else
+ prob = 0;
+ if (prob > taken_edge->probability)
+ {
+ if (dump_file)
+ fprintf (dump_file, "Jump threading proved probability of edge "
+ "%i->%i too small (it is %i, should be %i).\n",
+ taken_edge->src->index, taken_edge->dest->index,
+ taken_edge->probability, prob);
+ prob = taken_edge->probability;
+ }
+
+ /* Now rescale the probabilities. */
+ taken_edge->probability -= prob;
+ prob = REG_BR_PROB_BASE - prob;
+ bb->frequency -= edge_frequency;
+ if (bb->frequency < 0)
+ bb->frequency = 0;
+ if (prob <= 0)
+ {
+ if (dump_file)
+ fprintf (dump_file, "Edge frequencies of bb %i has been reset, "
+ "frequency of block should end up being 0, it is %i\n",
+ bb->index, bb->frequency);
+ EDGE_SUCC (bb, 0)->probability = REG_BR_PROB_BASE;
+ ei = ei_start (bb->succs);
+ ei_next (&ei);
+ for (; (c = ei_safe_edge (ei)); ei_next (&ei))
+ c->probability = 0;
+ }
+ else if (prob != REG_BR_PROB_BASE)
+ {
+ int scale = RDIV (65536 * REG_BR_PROB_BASE, prob);
+
+ FOR_EACH_EDGE (c, ei, bb->succs)
+ {
+ c->probability = RDIV (c->probability * scale, 65536);
+ if (c->probability > REG_BR_PROB_BASE)
+ c->probability = REG_BR_PROB_BASE;
+ }
+ }
+
+ gcc_assert (bb == taken_edge->src);
+ taken_edge->count -= count;
+ if (taken_edge->count < 0)
+ {
+ if (dump_file)
+ fprintf (dump_file, "edge %i->%i count became negative after threading",
+ taken_edge->src->index, taken_edge->dest->index);
+ taken_edge->count = 0;
+ }
+}
+
+/* Multiply all frequencies of basic blocks in array BBS of length NBBS
+ by NUM/DEN, in int arithmetic. May lose some accuracy. */
+void
+scale_bbs_frequencies_int (basic_block *bbs, int nbbs, int num, int den)
+{
+ int i;
+ edge e;
+ if (num < 0)
+ num = 0;
+
+ /* Scale NUM and DEN to avoid overflows. Frequencies are in order of
+ 10^4, if we make DEN <= 10^3, we can afford to upscale by 100
+ and still safely fit in int during calculations. */
+ if (den > 1000)
+ {
+ if (num > 1000000)
+ return;
+
+ num = RDIV (1000 * num, den);
+ den = 1000;
+ }
+ if (num > 100 * den)
+ return;
+
+ for (i = 0; i < nbbs; i++)
+ {
+ edge_iterator ei;
+ bbs[i]->frequency = RDIV (bbs[i]->frequency * num, den);
+ /* Make sure the frequencies do not grow over BB_FREQ_MAX. */
+ if (bbs[i]->frequency > BB_FREQ_MAX)
+ bbs[i]->frequency = BB_FREQ_MAX;
+ bbs[i]->count = RDIV (bbs[i]->count * num, den);
+ FOR_EACH_EDGE (e, ei, bbs[i]->succs)
+ e->count = RDIV (e->count * num, den);
+ }
+}
+
+/* numbers smaller than this value are safe to multiply without getting
+ 64bit overflow. */
+#define MAX_SAFE_MULTIPLIER (1 << (sizeof (HOST_WIDEST_INT) * 4 - 1))
+
+/* Multiply all frequencies of basic blocks in array BBS of length NBBS
+ by NUM/DEN, in gcov_type arithmetic. More accurate than previous
+ function but considerably slower. */
+void
+scale_bbs_frequencies_gcov_type (basic_block *bbs, int nbbs, gcov_type num,
+ gcov_type den)
+{
+ int i;
+ edge e;
+ gcov_type fraction = RDIV (num * 65536, den);
+
+ gcc_assert (fraction >= 0);
+
+ if (num < MAX_SAFE_MULTIPLIER)
+ for (i = 0; i < nbbs; i++)
+ {
+ edge_iterator ei;
+ bbs[i]->frequency = RDIV (bbs[i]->frequency * num, den);
+ if (bbs[i]->count <= MAX_SAFE_MULTIPLIER)
+ bbs[i]->count = RDIV (bbs[i]->count * num, den);
+ else
+ bbs[i]->count = RDIV (bbs[i]->count * fraction, 65536);
+ FOR_EACH_EDGE (e, ei, bbs[i]->succs)
+ if (bbs[i]->count <= MAX_SAFE_MULTIPLIER)
+ e->count = RDIV (e->count * num, den);
+ else
+ e->count = RDIV (e->count * fraction, 65536);
+ }
+ else
+ for (i = 0; i < nbbs; i++)
+ {
+ edge_iterator ei;
+ if (sizeof (gcov_type) > sizeof (int))
+ bbs[i]->frequency = RDIV (bbs[i]->frequency * num, den);
+ else
+ bbs[i]->frequency = RDIV (bbs[i]->frequency * fraction, 65536);
+ bbs[i]->count = RDIV (bbs[i]->count * fraction, 65536);
+ FOR_EACH_EDGE (e, ei, bbs[i]->succs)
+ e->count = RDIV (e->count * fraction, 65536);
+ }
+}
+
+/* Data structures used to maintain mapping between basic blocks and
+ copies. */
+static htab_t bb_original;
+static htab_t bb_copy;
+
+/* And between loops and copies. */
+static htab_t loop_copy;
+static alloc_pool original_copy_bb_pool;
+
+struct htab_bb_copy_original_entry
+{
+ /* Block we are attaching info to. */
+ int index1;
+ /* Index of original or copy (depending on the hashtable) */
+ int index2;
+};
+
+static hashval_t
+bb_copy_original_hash (const void *p)
+{
+ const struct htab_bb_copy_original_entry *data
+ = ((const struct htab_bb_copy_original_entry *)p);
+
+ return data->index1;
+}
+static int
+bb_copy_original_eq (const void *p, const void *q)
+{
+ const struct htab_bb_copy_original_entry *data
+ = ((const struct htab_bb_copy_original_entry *)p);
+ const struct htab_bb_copy_original_entry *data2
+ = ((const struct htab_bb_copy_original_entry *)q);
+
+ return data->index1 == data2->index1;
+}
+
+/* Initialize the data structures to maintain mapping between blocks
+ and its copies. */
+void
+initialize_original_copy_tables (void)
+{
+ gcc_assert (!original_copy_bb_pool);
+ original_copy_bb_pool
+ = create_alloc_pool ("original_copy",
+ sizeof (struct htab_bb_copy_original_entry), 10);
+ bb_original = htab_create (10, bb_copy_original_hash,
+ bb_copy_original_eq, NULL);
+ bb_copy = htab_create (10, bb_copy_original_hash, bb_copy_original_eq, NULL);
+ loop_copy = htab_create (10, bb_copy_original_hash, bb_copy_original_eq, NULL);
+}
+
+/* Free the data structures to maintain mapping between blocks and
+ its copies. */
+void
+free_original_copy_tables (void)
+{
+ gcc_assert (original_copy_bb_pool);
+ htab_delete (bb_copy);
+ htab_delete (bb_original);
+ htab_delete (loop_copy);
+ free_alloc_pool (original_copy_bb_pool);
+ bb_copy = NULL;
+ bb_original = NULL;
+ loop_copy = NULL;
+ original_copy_bb_pool = NULL;
+}
+
+/* Removes the value associated with OBJ from table TAB. */
+
+static void
+copy_original_table_clear (htab_t tab, unsigned obj)
+{
+ void **slot;
+ struct htab_bb_copy_original_entry key, *elt;
+
+ if (!original_copy_bb_pool)
+ return;
+
+ key.index1 = obj;
+ slot = htab_find_slot (tab, &key, NO_INSERT);
+ if (!slot)
+ return;
+
+ elt = (struct htab_bb_copy_original_entry *) *slot;
+ htab_clear_slot (tab, slot);
+ pool_free (original_copy_bb_pool, elt);
+}
+
+/* Sets the value associated with OBJ in table TAB to VAL.
+ Do nothing when data structures are not initialized. */
+
+static void
+copy_original_table_set (htab_t tab, unsigned obj, unsigned val)
+{
+ struct htab_bb_copy_original_entry **slot;
+ struct htab_bb_copy_original_entry key;
+
+ if (!original_copy_bb_pool)
+ return;
+
+ key.index1 = obj;
+ slot = (struct htab_bb_copy_original_entry **)
+ htab_find_slot (tab, &key, INSERT);
+ if (!*slot)
+ {
+ *slot = (struct htab_bb_copy_original_entry *)
+ pool_alloc (original_copy_bb_pool);
+ (*slot)->index1 = obj;
+ }
+ (*slot)->index2 = val;
+}
+
+/* Set original for basic block. Do nothing when data structures are not
+ initialized so passes not needing this don't need to care. */
+void
+set_bb_original (basic_block bb, basic_block original)
+{
+ copy_original_table_set (bb_original, bb->index, original->index);
+}
+
+/* Get the original basic block. */
+basic_block
+get_bb_original (basic_block bb)
+{
+ struct htab_bb_copy_original_entry *entry;
+ struct htab_bb_copy_original_entry key;
+
+ gcc_assert (original_copy_bb_pool);
+
+ key.index1 = bb->index;
+ entry = (struct htab_bb_copy_original_entry *) htab_find (bb_original, &key);
+ if (entry)
+ return BASIC_BLOCK (entry->index2);
+ else
+ return NULL;
+}
+
+/* Set copy for basic block. Do nothing when data structures are not
+ initialized so passes not needing this don't need to care. */
+void
+set_bb_copy (basic_block bb, basic_block copy)
+{
+ copy_original_table_set (bb_copy, bb->index, copy->index);
+}
+
+/* Get the copy of basic block. */
+basic_block
+get_bb_copy (basic_block bb)
+{
+ struct htab_bb_copy_original_entry *entry;
+ struct htab_bb_copy_original_entry key;
+
+ gcc_assert (original_copy_bb_pool);
+
+ key.index1 = bb->index;
+ entry = (struct htab_bb_copy_original_entry *) htab_find (bb_copy, &key);
+ if (entry)
+ return BASIC_BLOCK (entry->index2);
+ else
+ return NULL;
+}
+
+/* Set copy for LOOP to COPY. Do nothing when data structures are not
+ initialized so passes not needing this don't need to care. */
+
+void
+set_loop_copy (struct loop *loop, struct loop *copy)
+{
+ if (!copy)
+ copy_original_table_clear (loop_copy, loop->num);
+ else
+ copy_original_table_set (loop_copy, loop->num, copy->num);
+}
+
+/* Get the copy of LOOP. */
+
+struct loop *
+get_loop_copy (struct loop *loop)
+{
+ struct htab_bb_copy_original_entry *entry;
+ struct htab_bb_copy_original_entry key;
+
+ gcc_assert (original_copy_bb_pool);
+
+ key.index1 = loop->num;
+ entry = (struct htab_bb_copy_original_entry *) htab_find (loop_copy, &key);
+ if (entry)
+ return get_loop (entry->index2);
+ else
+ return NULL;
+}
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