/* This is a list of expressions which are MEMs and will be used by load
or store motion.
Load motion tracks MEMs which aren't killed by
- anything except itself. (ie, loads and stores to a single location).
+ anything except itself. (i.e., loads and stores to a single location).
We can then allow movement of these MEM refs with a little special
allowance. (all stores copy the same value to the reaching reg used
for the loads). This means all values used to store into memory must have
clear_modify_mem_tables (void)
{
int i;
+ bitmap_iterator bi;
- EXECUTE_IF_SET_IN_BITMAP
- (modify_mem_list_set, 0, i, free_INSN_LIST_list (modify_mem_list + i));
+ EXECUTE_IF_SET_IN_BITMAP (modify_mem_list_set, 0, i, bi)
+ {
+ free_INSN_LIST_list (modify_mem_list + i);
+ }
bitmap_clear (modify_mem_list_set);
- EXECUTE_IF_SET_IN_BITMAP
- (canon_modify_mem_list_set, 0, i,
- free_insn_expr_list_list (canon_modify_mem_list + i));
+ EXECUTE_IF_SET_IN_BITMAP (canon_modify_mem_list_set, 0, i, bi)
+ {
+ free_insn_expr_list_list (canon_modify_mem_list + i);
+ }
bitmap_clear (canon_modify_mem_list_set);
}
struct expr *set1 = 0;
/* Loops are not possible here. To get a loop we would need two sets
- available at the start of the block containing INSN. ie we would
+ available at the start of the block containing INSN. i.e. we would
need two sets like this available at the start of the block:
(set (reg X) (reg Y))
if (! REG_P (src))
break;
- /* Follow the copy chain, ie start another iteration of the loop
+ /* Follow the copy chain, i.e. start another iteration of the loop
and see if we have an available copy into SRC. */
regno = REGNO (src);
}
count = 0;
FOR_EACH_BB (bb)
/* Check for more than one successor. */
- if (bb->succ && bb->succ->succ_next)
+ if (EDGE_COUNT (bb->succs) > 1)
{
cond = fis_get_condition (BB_END (bb));
dest = GET_CODE (cond) == EQ ? BRANCH_EDGE (bb)->dest
: FALLTHRU_EDGE (bb)->dest;
- if (dest && ! dest->pred->pred_next
+ if (dest && EDGE_COUNT (dest->preds) == 1
&& dest != EXIT_BLOCK_PTR)
{
new = gen_rtx_SET (VOIDmode, XEXP (cond, 0),
bypass_block (basic_block bb, rtx setcc, rtx jump)
{
rtx insn, note;
- edge e, enext, edest;
+ edge e, edest;
int i, change;
int may_be_loop_header;
+ unsigned removed_p;
+ edge_iterator ei;
insn = (setcc != NULL) ? setcc : jump;
find_used_regs (&XEXP (note, 0), NULL);
may_be_loop_header = false;
- for (e = bb->pred; e; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
if (e->flags & EDGE_DFS_BACK)
{
may_be_loop_header = true;
}
change = 0;
- for (e = bb->pred; e; e = enext)
+ for (ei = ei_start (bb->preds); (e = ei_safe_edge (ei)); )
{
- enext = e->pred_next;
+ removed_p = 0;
+
if (e->flags & EDGE_COMPLEX)
- continue;
+ {
+ ei_next (&ei);
+ continue;
+ }
/* We can't redirect edges from new basic blocks. */
if (e->src->index >= bypass_last_basic_block)
- continue;
+ {
+ ei_next (&ei);
+ continue;
+ }
/* The irreducible loops created by redirecting of edges entering the
loop from outside would decrease effectiveness of some of the following
optimizations, so prevent this. */
if (may_be_loop_header
&& !(e->flags & EDGE_DFS_BACK))
- continue;
+ {
+ ei_next (&ei);
+ continue;
+ }
for (i = 0; i < reg_use_count; i++)
{
}
else if (GET_CODE (new) == LABEL_REF)
{
+ edge_iterator ei2;
+
dest = BLOCK_FOR_INSN (XEXP (new, 0));
/* Don't bypass edges containing instructions. */
- for (edest = bb->succ; edest; edest = edest->succ_next)
+ FOR_EACH_EDGE (edest, ei2, bb->succs)
if (edest->dest == dest && edest->insns.r)
{
dest = NULL;
if (dest && setcc && !CC0_P (SET_DEST (PATTERN (setcc))))
{
edge e2;
- for (e2 = e->src->succ; e2; e2 = e2->succ_next)
+ edge_iterator ei2;
+
+ FOR_EACH_EDGE (e2, ei2, e->src->succs)
if (e2->dest == dest)
{
dest = NULL;
e->src->index, old_dest->index, dest->index);
}
change = 1;
+ removed_p = 1;
break;
}
}
+ if (!removed_p)
+ ei_next (&ei);
}
return change;
}
EXIT_BLOCK_PTR, next_bb)
{
/* Check for more than one predecessor. */
- if (bb->pred && bb->pred->pred_next)
+ if (EDGE_COUNT (bb->preds) > 1)
{
setcc = NULL_RTX;
for (insn = BB_HEAD (bb);
FOR_EACH_BB (bb)
{
edge e;
+ edge_iterator ei;
/* If the current block is the destination of an abnormal edge, we
kill all trapping expressions because we won't be able to properly
place the instruction on the edge. So make them neither
anticipatable nor transparent. This is fairly conservative. */
- for (e = bb->pred; e ; e = e->pred_next)
+ FOR_EACH_EDGE (e, ei, bb->preds)
if (e->flags & EDGE_ABNORMAL)
{
sbitmap_difference (antloc[bb->index], antloc[bb->index], trapping_expr);
pre_expr_reaches_here_p_work (basic_block occr_bb, struct expr *expr, basic_block bb, char *visited)
{
edge pred;
-
- for (pred = bb->pred; pred != NULL; pred = pred->pred_next)
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (pred, ei, bb->preds)
{
basic_block pred_bb = pred->src;
{
rtx insn = emit_insn (gen_rtx_SET (VOIDmode, reg, exp));
- gcc_assert (!insn_invalid_p (insn));
+ if (insn_invalid_p (insn))
+ gcc_unreachable ();
}
if (JUMP_P (insn)
|| (NONJUMP_INSN_P (insn)
- && (bb->succ->succ_next || (bb->succ->flags & EDGE_ABNORMAL))))
+ && (EDGE_COUNT (bb->succs) > 1
+ || EDGE_SUCC (bb, 0)->flags & EDGE_ABNORMAL)))
{
#ifdef HAVE_cc0
rtx note;
}
#endif
/* FIXME: What if something in cc0/jump uses value set in new insn? */
- new_insn = emit_insn_before (pat, insn);
+ new_insn = emit_insn_before_noloc (pat, insn);
}
/* Likewise if the last insn is a call, as will happen in the presence
of exception handling. */
else if (CALL_P (insn)
- && (bb->succ->succ_next || (bb->succ->flags & EDGE_ABNORMAL)))
+ && (EDGE_COUNT (bb->succs) > 1 || EDGE_SUCC (bb, 0)->flags & EDGE_ABNORMAL))
{
/* Keeping in mind SMALL_REGISTER_CLASSES and parameters in registers,
we search backward and place the instructions before the first
|| NOTE_INSN_BASIC_BLOCK_P (insn))
insn = NEXT_INSN (insn);
- new_insn = emit_insn_before (pat, insn);
+ new_insn = emit_insn_before_noloc (pat, insn);
}
else
- new_insn = emit_insn_after (pat, insn);
+ new_insn = emit_insn_after_noloc (pat, insn);
while (1)
{
hoist_expr_reaches_here_p (basic_block expr_bb, int expr_index, basic_block bb, char *visited)
{
edge pred;
+ edge_iterator ei;
int visited_allocated_locally = 0;
visited = xcalloc (last_basic_block, 1);
}
- for (pred = bb->pred; pred != NULL; pred = pred->pred_next)
+ FOR_EACH_EDGE (pred, ei, bb->preds)
{
basic_block pred_bb = pred->src;
before = NEXT_INSN (before);
}
- insn = emit_insn_after (insn, prev);
+ insn = emit_insn_after_noloc (insn, prev);
if (gcse_file)
{
rtx reg, insn;
basic_block bb;
edge tmp;
+ edge_iterator ei;
/* We did all the deleted before this insert, so if we didn't delete a
store, then we haven't set the reaching reg yet either. */
insert it at the start of the BB, and reset the insert bits on the other
edges so we don't try to insert it on the other edges. */
bb = e->dest;
- for (tmp = e->dest->pred; tmp ; tmp = tmp->pred_next)
+ FOR_EACH_EDGE (tmp, ei, e->dest->preds)
if (!(tmp->flags & EDGE_FAKE))
{
int index = EDGE_INDEX (edge_list, tmp->src, tmp->dest);
insertion vector for these edges, and insert at the start of the BB. */
if (!tmp && bb != EXIT_BLOCK_PTR)
{
- for (tmp = e->dest->pred; tmp ; tmp = tmp->pred_next)
+ FOR_EACH_EDGE (tmp, ei, e->dest->preds)
{
int index = EDGE_INDEX (edge_list, tmp->src, tmp->dest);
RESET_BIT (pre_insert_map[index], expr->index);
static void
remove_reachable_equiv_notes (basic_block bb, struct ls_expr *smexpr)
{
- edge *stack = xmalloc (sizeof (edge) * n_basic_blocks), act;
+ edge_iterator *stack, ei;
+ int sp;
+ edge act;
sbitmap visited = sbitmap_alloc (last_basic_block);
- int stack_top = 0;
rtx last, insn, note;
rtx mem = smexpr->pattern;
+ stack = xmalloc (sizeof (edge_iterator) * n_basic_blocks);
+ sp = 0;
+ ei = ei_start (bb->succs);
+
sbitmap_zero (visited);
- act = bb->succ;
+ act = (EDGE_COUNT (ei.container) > 0 ? EDGE_I (ei.container, 0) : NULL);
while (1)
{
if (!act)
{
- if (!stack_top)
+ if (!sp)
{
free (stack);
sbitmap_free (visited);
return;
}
- act = stack[--stack_top];
+ act = ei_edge (stack[--sp]);
}
bb = act->dest;
if (bb == EXIT_BLOCK_PTR
|| TEST_BIT (visited, bb->index))
{
- act = act->succ_next;
+ if (!ei_end_p (ei))
+ ei_next (&ei);
+ act = (! ei_end_p (ei)) ? ei_edge (ei) : NULL;
continue;
}
SET_BIT (visited, bb->index);
INSN_UID (insn));
remove_note (insn, note);
}
- act = act->succ_next;
- if (bb->succ)
+
+ if (!ei_end_p (ei))
+ ei_next (&ei);
+ act = (! ei_end_p (ei)) ? ei_edge (ei) : NULL;
+
+ if (EDGE_COUNT (bb->succs) > 0)
{
if (act)
- stack[stack_top++] = act;
- act = bb->succ;
+ stack[sp++] = ei;
+ ei = ei_start (bb->succs);
+ act = (EDGE_COUNT (ei.container) > 0 ? EDGE_I (ei.container, 0) : NULL);
}
}
}