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domwalk.c (walk_dominator_tree): Reorganize to non-recursive implementation.

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* domwalk.c (walk_dominator_tree): Reorganize to non-recursive
	implementation.

From-SVN: r115912
This commit is contained in:
Jan Hubicka 2006-08-03 23:21:22 +02:00 committed by Jan Hubicka
parent d508327cc8
commit df648b94c9
2 changed files with 116 additions and 87 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2006-08-03 Jan Hubicka <jh@suse.cz>
* domwalk.c (walk_dominator_tree): Reorganize to non-recursive
implementation.
2006-08-03 Dorit Nuzman <dorit@il.ibm.com>
PR tree-optimization/27770

198
gcc/domwalk.c
View File

@ -146,101 +146,125 @@ walk_dominator_tree (struct dom_walk_data *walk_data, basic_block bb)
basic_block dest;
block_stmt_iterator bsi;
bool is_interesting;
basic_block *worklist = XNEWVEC (basic_block, n_basic_blocks * 2);
int sp = 0;
/* If block BB is not interesting to the caller, then none of the
callbacks that walk the statements in BB are going to be
executed. */
is_interesting = bb->index < 0
|| walk_data->interesting_blocks == NULL
|| TEST_BIT (walk_data->interesting_blocks, bb->index);
/* Callback to initialize the local data structure. */
if (walk_data->initialize_block_local_data)
while (true)
{
bool recycled;
/* First get some local data, reusing any local data pointer we may
have saved. */
if (VEC_length (void_p, walk_data->free_block_data) > 0)
/* Don't worry about unreachable blocks. */
if (EDGE_COUNT (bb->preds) > 0 || bb == ENTRY_BLOCK_PTR)
{
bd = VEC_pop (void_p, walk_data->free_block_data);
recycled = 1;
/* If block BB is not interesting to the caller, then none of the
callbacks that walk the statements in BB are going to be
executed. */
is_interesting = walk_data->interesting_blocks == NULL
|| TEST_BIT (walk_data->interesting_blocks,
bb->index);
/* Callback to initialize the local data structure. */
if (walk_data->initialize_block_local_data)
{
bool recycled;
/* First get some local data, reusing any local data pointer we may
have saved. */
if (VEC_length (void_p, walk_data->free_block_data) > 0)
{
bd = VEC_pop (void_p, walk_data->free_block_data);
recycled = 1;
}
else
{
bd = xcalloc (1, walk_data->block_local_data_size);
recycled = 0;
}
/* Push the local data into the local data stack. */
VEC_safe_push (void_p, heap, walk_data->block_data_stack, bd);
/* Call the initializer. */
walk_data->initialize_block_local_data (walk_data, bb,
recycled);
}
/* Callback for operations to execute before we have walked the
dominator children, but before we walk statements. */
if (walk_data->before_dom_children_before_stmts)
(*walk_data->before_dom_children_before_stmts) (walk_data, bb);
/* Statement walk before walking dominator children. */
if (is_interesting && walk_data->before_dom_children_walk_stmts)
{
if (walk_data->walk_stmts_backward)
for (bsi = bsi_last (bb); !bsi_end_p (bsi); bsi_prev (&bsi))
(*walk_data->before_dom_children_walk_stmts) (walk_data, bb,
bsi);
else
for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
(*walk_data->before_dom_children_walk_stmts) (walk_data, bb,
bsi);
}
/* Callback for operations to execute before we have walked the
dominator children, and after we walk statements. */
if (walk_data->before_dom_children_after_stmts)
(*walk_data->before_dom_children_after_stmts) (walk_data, bb);
/* Mark the current BB to be popped out of the recursion stack
once childs are processed. */
worklist[sp++] = bb;
worklist[sp++] = NULL;
for (dest = first_dom_son (walk_data->dom_direction, bb);
dest; dest = next_dom_son (walk_data->dom_direction, dest))
worklist[sp++] = dest;
}
else
/* NULL is used to signalize pop operation in recursion stack. */
while (sp > 0 && !worklist[sp - 1])
{
bd = xcalloc (1, walk_data->block_local_data_size);
recycled = 0;
--sp;
bb = worklist[--sp];
is_interesting = walk_data->interesting_blocks == NULL
|| TEST_BIT (walk_data->interesting_blocks,
bb->index);
/* Callback for operations to execute after we have walked the
dominator children, but before we walk statements. */
if (walk_data->after_dom_children_before_stmts)
(*walk_data->after_dom_children_before_stmts) (walk_data, bb);
/* Statement walk after walking dominator children. */
if (is_interesting && walk_data->after_dom_children_walk_stmts)
{
if (walk_data->walk_stmts_backward)
for (bsi = bsi_last (bb); !bsi_end_p (bsi); bsi_prev (&bsi))
(*walk_data->after_dom_children_walk_stmts) (walk_data, bb,
bsi);
else
for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
(*walk_data->after_dom_children_walk_stmts) (walk_data, bb,
bsi);
}
/* Callback for operations to execute after we have walked the
dominator children and after we have walked statements. */
if (walk_data->after_dom_children_after_stmts)
(*walk_data->after_dom_children_after_stmts) (walk_data, bb);
if (walk_data->initialize_block_local_data)
{
/* And finally pop the record off the block local data stack. */
bd = VEC_pop (void_p, walk_data->block_data_stack);
/* And save the block data so that we can re-use it. */
VEC_safe_push (void_p, heap, walk_data->free_block_data, bd);
}
}
/* Push the local data into the local data stack. */
VEC_safe_push (void_p, heap, walk_data->block_data_stack, bd);
/* Call the initializer. */
walk_data->initialize_block_local_data (walk_data, bb, recycled);
}
/* Callback for operations to execute before we have walked the
dominator children, but before we walk statements. */
if (walk_data->before_dom_children_before_stmts)
(*walk_data->before_dom_children_before_stmts) (walk_data, bb);
/* Statement walk before walking dominator children. */
if (is_interesting && walk_data->before_dom_children_walk_stmts)
{
if (walk_data->walk_stmts_backward)
for (bsi = bsi_last (bb); !bsi_end_p (bsi); bsi_prev (&bsi))
(*walk_data->before_dom_children_walk_stmts) (walk_data, bb, bsi);
if (sp)
bb = worklist[--sp];
else
for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
(*walk_data->before_dom_children_walk_stmts) (walk_data, bb, bsi);
}
/* Callback for operations to execute before we have walked the
dominator children, and after we walk statements. */
if (walk_data->before_dom_children_after_stmts)
(*walk_data->before_dom_children_after_stmts) (walk_data, bb);
/* Recursively call ourselves on the dominator children of BB. */
for (dest = first_dom_son (walk_data->dom_direction, bb);
dest;
dest = next_dom_son (walk_data->dom_direction, dest))
{
/* The destination block may have become unreachable, in
which case there's no point in optimizing it. */
if (EDGE_COUNT (dest->preds) > 0)
walk_dominator_tree (walk_data, dest);
}
/* Callback for operations to execute after we have walked the
dominator children, but before we walk statements. */
if (walk_data->after_dom_children_before_stmts)
(*walk_data->after_dom_children_before_stmts) (walk_data, bb);
/* Statement walk after walking dominator children. */
if (is_interesting && walk_data->after_dom_children_walk_stmts)
{
if (walk_data->walk_stmts_backward)
for (bsi = bsi_last (bb); !bsi_end_p (bsi); bsi_prev (&bsi))
(*walk_data->after_dom_children_walk_stmts) (walk_data, bb, bsi);
else
for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
(*walk_data->after_dom_children_walk_stmts) (walk_data, bb, bsi);
}
/* Callback for operations to execute after we have walked the
dominator children and after we have walked statements. */
if (walk_data->after_dom_children_after_stmts)
(*walk_data->after_dom_children_after_stmts) (walk_data, bb);
if (walk_data->initialize_block_local_data)
{
/* And save the block data so that we can re-use it. */
VEC_safe_push (void_p, heap, walk_data->free_block_data, bd);
/* And finally pop the record off the block local data stack. */
VEC_pop (void_p, walk_data->block_data_stack);
break;
}
free (worklist);
}
void