* @date 06.12.2004
* @version $Id$
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
+
+/* statev is expensive here, only enable when needed */
+#define DISABLE_STATEV
#include "impl.h"
#include "iredges_t.h"
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
-/* see comment in compute_liveness() */
-#define LV_COMPUTE_SORTED
#define LV_STD_SIZE 64
+
+/* if defined, use binary search for already live nodes, else linear */
#define LV_USE_BINARY_SEARCH
#undef LV_INTESIVE_CHECKS
void be_live_chk_compare(be_lv_t *lv, lv_chk_t *lvc);
-static INLINE int is_liveness_node(const ir_node *irn)
+/**
+ * Filter out some nodes for which we never need liveness.
+ *
+ * @param irn the node t check
+ * @return 0 if no liveness info is needed, 1 else
+ */
+static inline int is_liveness_node(const ir_node *irn)
{
- switch(get_irn_opcode(irn)) {
+ switch (get_irn_opcode(irn)) {
case iro_Block:
case iro_Bad:
case iro_End:
case iro_Anchor:
case iro_NoMem:
return 0;
- default:;
+ default:
+ return 1;
}
-
- return 1;
}
int (be_lv_next_irn)(const struct _be_lv_t *lv, const ir_node *bl, unsigned flags, int i)
#ifdef LV_USE_BINARY_SEARCH
-static INLINE unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned idx)
+static inline unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned idx)
{
struct _be_lv_info_t *payload = arr + 1;
/**
* This function searches linearly for the node in the array.
*/
-static INLINE unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned idx) {
+static inline unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned idx) {
unsigned n = arr[0].u.head.n_members;
unsigned i;
/**
* Mark a node as live-in in a block.
*/
-static INLINE void mark_live_in(be_lv_t *lv, ir_node *block, ir_node *irn)
+static inline void mark_live_in(be_lv_t *lv, ir_node *block, ir_node *irn)
{
struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
DBG((dbg, LEVEL_2, "marking %+F live in at %+F\n", irn, block));
/**
* Mark a node as live-out in a block.
*/
-static INLINE void mark_live_out(be_lv_t *lv, ir_node *block, ir_node *irn)
+static inline void mark_live_out(be_lv_t *lv, ir_node *block, ir_node *irn)
{
struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
DBG((dbg, LEVEL_2, "marking %+F live out at %+F\n", irn, block));
/**
* Mark a node as live-end in a block.
*/
-static INLINE void mark_live_end(be_lv_t *lv, ir_node *block, ir_node *irn)
+static inline void mark_live_end(be_lv_t *lv, ir_node *block, ir_node *irn)
{
struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
DBG((dbg, LEVEL_2, "marking %+F live end at %+F\n", irn, block));
register_node(lv, irn);
}
+static struct {
+ be_lv_t *lv; /**< The liveness object. */
+ ir_node *def; /**< The node (value). */
+ ir_node *def_block; /**< The block of def. */
+ bitset_t *visited; /**< A set were all visited blocks are recorded. */
+} re;
+
/**
* Mark a node (value) live out at a certain block. Do this also
* transitively, i.e. if the block is not the block of the value's
* definition, all predecessors are also marked live.
- * @param def The node (value).
* @param block The block to mark the value live out of.
- * @param visited A set were all visited blocks are recorded.
* @param is_true_out Is the node real out there or only live at the end
* of the block.
*/
-static void live_end_at_block(be_lv_t *lv, ir_node *def, ir_node *block, bitset_t *visited, int is_true_out)
+static void live_end_at_block(ir_node *block, int is_true_out)
{
+ be_lv_t *lv = re.lv;
+ ir_node *def = re.def;
+ bitset_t *visited;
+
mark_live_end(lv, block, def);
- if(is_true_out)
+ if (is_true_out)
mark_live_out(lv, block, def);
- if(!bitset_contains_irn(visited, block)) {
+ visited = re.visited;
+ if (!bitset_contains_irn(visited, block)) {
bitset_add_irn(visited, block);
/*
- * If this block is not the definition block, we have to go up
- * further.
- */
- if(get_nodes_block(def) != block) {
- int i, n;
+ * If this block is not the definition block, we have to go up
+ * further.
+ */
+ if (re.def_block != block) {
+ int i;
mark_live_in(lv, block, def);
- for(i = 0, n = get_Block_n_cfgpreds(block); i < n; ++i)
- live_end_at_block(lv, def, get_Block_cfgpred_block(block, i), visited, 1);
+ for (i = get_Block_n_cfgpreds(block) - 1; i >= 0; --i)
+ live_end_at_block(get_Block_cfgpred_block(block, i), 1);
}
-
}
}
-struct _lv_walker_t {
+typedef struct _lv_walker_t {
be_lv_t *lv;
void *data;
-};
+} lv_walker_t;
typedef struct lv_remove_walker_t {
be_lv_t *lv;
/**
* Liveness analysis for a value.
- * This functions is meant to be called by a firm walker, to compute the
- * set of all blocks a value is live in.
- * @param irn The node (value).
- * @param env Ignored.
+ * Compute the set of all blocks a value is live in.
+ * @param irn The node (value).
*/
-static void liveness_for_node(ir_node *irn, void *data)
+static void liveness_for_node(ir_node *irn)
{
- struct _lv_walker_t *walker = data;
- be_lv_t *lv = walker->lv;
- bitset_t *visited = walker->data;
const ir_edge_t *edge;
ir_node *def_block;
- /* Don't compute liveness information for non-data nodes. */
- if(!is_liveness_node(irn))
- return;
-
- bitset_clear_all(visited);
+ bitset_clear_all(re.visited);
def_block = get_nodes_block(irn);
+ re.def = irn;
+ re.def_block = def_block;
+
/* Go over all uses of the value */
foreach_out_edge(irn, edge) {
ir_node *use = edge->src;
* If the usage is no data node, skip this use, since it does not
* affect the liveness of the node.
*/
- if(!is_liveness_node(use))
+ if (!is_liveness_node(use))
continue;
/* Get the block where the usage is in. */
* through which the value reaches the phi function and mark the
* value as live out of that block.
*/
- if(is_Phi(use)) {
+ if (is_Phi(use)) {
ir_node *pred_block = get_Block_cfgpred_block(use_block, edge->pos);
- live_end_at_block(lv, irn, pred_block, visited, 0);
+ live_end_at_block(pred_block, 0);
}
/*
* Else, the value is live in at this block. Mark it and call live
* out on the predecessors.
*/
- else if(def_block != use_block) {
- int i, n;
+ else if (def_block != use_block) {
+ int i;
- mark_live_in(lv, use_block, irn);
+ mark_live_in(re.lv, use_block, irn);
- for(i = 0, n = get_Block_n_cfgpreds(use_block); i < n; ++i) {
+ for (i = get_Block_n_cfgpreds(use_block) - 1; i >= 0; --i) {
ir_node *pred_block = get_Block_cfgpred_block(use_block, i);
- live_end_at_block(lv, irn, pred_block, visited, 1);
+ live_end_at_block(pred_block, 1);
}
}
}
return info;
}
-static void collect_nodes(ir_node *irn, void *data)
+/**
+ * Walker, collect all nodes for which we want calculate liveness info
+ * on an obstack.
+ */
+static void collect_liveness_nodes(ir_node *irn, void *data)
{
- struct obstack *obst = data;
+ ir_node **nodes = data;
if (is_liveness_node(irn))
- obstack_ptr_grow(obst, irn);
-}
-
-static int node_idx_cmp(const void *a, const void *b)
-{
- const ir_node *p = *(ir_node **) a;
- const ir_node *q = *(ir_node **) b;
- int ia = get_irn_idx(p);
- int ib = get_irn_idx(q);
- return ia - ib;
+ nodes[get_irn_idx(irn)] = irn;
}
static void compute_liveness(be_lv_t *lv)
{
- struct obstack obst;
- struct _lv_walker_t w;
ir_node **nodes;
int i, n;
stat_ev_tim_push();
- obstack_init(&obst);
- irg_walk_graph(lv->irg, collect_nodes, NULL, &obst);
- n = obstack_object_size(&obst) / sizeof(nodes[0]);
- nodes = obstack_finish(&obst);
+ n = get_irg_last_idx(lv->irg);
+ nodes = NEW_ARR_F(ir_node *, n);
+ memset(nodes, 0, sizeof(nodes[0]) * n);
/*
* inserting the variables sorted by their ID is probably
* more efficient since the binary sorted set insertion
* will not need to move around the data.
- * However, if sorting the variables a priori pays off
- * needs to be checked, hence the define.
*/
-#ifdef LV_COMPUTE_SORTED
- qsort(nodes, n, sizeof(nodes[0]), node_idx_cmp);
-#endif
+ irg_walk_graph(lv->irg, NULL, collect_liveness_nodes, nodes);
- w.lv = lv;
- w.data = bitset_obstack_alloc(&obst, get_irg_last_idx(lv->irg));
+ re.lv = lv;
+ re.visited = bitset_malloc(n);
- for (i = 0; i < n; ++i)
- liveness_for_node(nodes[i], &w);
+ for (i = 0; i < n; ++i) {
+ if (nodes[i] != NULL)
+ liveness_for_node(nodes[i]);
+ }
- obstack_free(&obst, NULL);
+ DEL_ARR_F(nodes);
+ free(re.visited);
register_hook(hook_node_info, &lv->hook_info);
stat_ev_tim_pop("be_lv_sets_cons");
}
}
/* Compute the inter block liveness for a graph. */
-be_lv_t *be_liveness(const be_irg_t *birg)
+be_lv_t *be_liveness(ir_graph *irg)
{
- be_lv_t *lv = xmalloc(sizeof(lv[0]));
+ be_lv_t *lv = XMALLOCZ(be_lv_t);
- memset(lv, 0, sizeof(lv[0]));
- lv->irg = be_get_birg_irg(birg);
- lv->birg = birg;
+ lv->irg = irg;
#ifdef USE_LIVE_CHK
- lv->dfs = dfs_new(&absgraph_irg_cfg_succ, lv->irg);
+ lv->dfs = dfs_new(&absgraph_irg_cfg_succ, irg);
lv->lvc = lv_chk_new(lv->irg, lv->dfs);
#endif
lv->hook_info.context = lv;
void be_liveness_free(be_lv_t *lv)
{
be_liveness_invalidate(lv);
- free(lv);
+#ifdef USE_LIVE_CHK
+ lv_chk_free(lv->lvc);
+ dfs_free(lv->dfs);
+#endif
+ xfree(lv);
}
void be_liveness_remove(be_lv_t *lv, const ir_node *irn)
void be_liveness_introduce(be_lv_t *lv, ir_node *irn)
{
- if (lv->nodes) {
- struct _lv_walker_t w;
- w.lv = lv;
- w.data = bitset_malloc(get_irg_last_idx(lv->irg));
- liveness_for_node(irn, &w);
- bitset_free(w.data);
+ /* Don't compute liveness information for non-data nodes. */
+ if (lv->nodes && is_liveness_node(irn)) {
+ re.lv = lv;
+ re.visited = bitset_malloc(get_irg_last_idx(lv->irg));
+ liveness_for_node(irn);
+ bitset_free(re.visited);
}
}
static void lv_check_walker(ir_node *bl, void *data)
{
- struct _lv_walker_t *w = data;
+ lv_walker_t *w = data;
be_lv_t *lv = w->lv;
be_lv_t *fresh = w->data;
void be_liveness_check(be_lv_t *lv)
{
- struct _lv_walker_t w;
- be_lv_t *fresh = be_liveness(lv->birg);
+ lv_walker_t w;
+ be_lv_t *fresh = be_liveness(lv->irg);
w.lv = lv;
w.data = fresh;
static void lv_dump_block_walker(ir_node *irn, void *data)
{
- struct _lv_walker_t *w = data;
+ lv_walker_t *w = data;
if(is_Block(irn))
lv_dump_block(w->lv, w->data, irn);
}
/* Dump the liveness information for a graph. */
void be_liveness_dump(const be_lv_t *lv, FILE *f)
{
- struct _lv_walker_t w;
+ lv_walker_t w;
w.lv = (be_lv_t *) lv;
w.data = f;
return !problem_found;
}
-void be_liveness_transfer(const arch_env_t *arch_env,
- const arch_register_class_t *cls,
+void be_liveness_transfer(const arch_register_class_t *cls,
ir_node *node, ir_nodeset_t *nodeset)
{
int i, arity;
foreach_out_edge(node, edge) {
ir_node *proj = get_edge_src_irn(edge);
- if (arch_irn_consider_in_reg_alloc(arch_env, cls, proj)) {
+ if (arch_irn_consider_in_reg_alloc(cls, proj)) {
ir_nodeset_remove(nodeset, proj);
}
}
- } else if (arch_irn_consider_in_reg_alloc(arch_env, cls, node)) {
+ } else if (arch_irn_consider_in_reg_alloc(cls, node)) {
ir_nodeset_remove(nodeset, node);
}
for (i = 0; i < arity; ++i) {
ir_node *op = get_irn_n(node, i);
- if (arch_irn_consider_in_reg_alloc(arch_env, cls, op))
+ if (arch_irn_consider_in_reg_alloc(cls, op))
ir_nodeset_insert(nodeset, op);
}
}
-void be_liveness_end_of_block(const be_lv_t *lv, const arch_env_t *arch_env,
+void be_liveness_end_of_block(const be_lv_t *lv,
const arch_register_class_t *cls,
const ir_node *block, ir_nodeset_t *live)
{
assert(lv->nodes && "live sets must be computed");
be_lv_foreach(lv, block, be_lv_state_end, i) {
ir_node *node = be_lv_get_irn(lv, block, i);
- if(!arch_irn_consider_in_reg_alloc(arch_env, cls, node))
+ if (!arch_irn_consider_in_reg_alloc(cls, node))
continue;
ir_nodeset_insert(live, node);
-void be_liveness_nodes_live_at(const be_lv_t *lv, const arch_env_t *arch_env,
+void be_liveness_nodes_live_at(const be_lv_t *lv,
const arch_register_class_t *cls,
const ir_node *pos, ir_nodeset_t *live)
{
const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
ir_node *irn;
- be_liveness_end_of_block(lv, arch_env, cls, bl, live);
+ be_liveness_end_of_block(lv, cls, bl, live);
sched_foreach_reverse(bl, irn) {
/*
* If we encounter the node we want to insert the Perm after,
if(irn == pos)
return;
- be_liveness_transfer(arch_env, cls, irn, live);
- }
-}
-
-void be_liveness_nodes_live_at_input(const be_lv_t *lv,
- const arch_env_t *arch_env,
- const arch_register_class_t *cls,
- const ir_node *pos, ir_nodeset_t *live)
-{
- const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
- ir_node *irn;
-
- assert(lv->nodes && "live sets must be computed");
- be_liveness_end_of_block(lv, arch_env, cls, bl, live);
- sched_foreach_reverse(bl, irn) {
- be_liveness_transfer(arch_env, cls, irn, live);
- if(irn == pos)
- return;
+ be_liveness_transfer(cls, irn, live);
}
}