* @date 21.04.2007
* @author Sebastian Hack
* @version $Id$
- * @summary
+ * @brief
*
* Liveness checks as developed by Benoit Boissinot, Fabrice Rastello and myself.
*
*
* The precomputation remains valid as long as the CFG is not altered.
*/
-#ifdef HAVE_CONFIG_H
#include <config.h>
-#endif
#include <stdio.h>
#include "statev.h"
typedef struct _bl_info_t {
- ir_node *block; /**< The block. */
+ const ir_node *block; /**< The block. */
int be_tgt_calc : 1;
int id : 31; /**< a tight number for the block.
#define get_block_info(lv, bl) ((bl_info_t *) phase_get_irn_data(&(lv)->ph, bl))
struct _lv_chk_t {
- ir_phase ph;
+ ir_phase ph;
const dfs_t *dfs;
+ int n_blocks;
+ bitset_t *back_edge_src;
+ bitset_t *back_edge_tgt;
+ bl_info_t **map;
DEBUG_ONLY(firm_dbg_module_t *dbg;)
- int n_blocks;
- bitset_t *back_edge_src;
- bitset_t *back_edge_tgt;
- bl_info_t **map;
};
-static void *init_block_data(ir_phase *ph, ir_node *irn, void *old)
+static void *init_block_data(ir_phase *ph, const ir_node *irn, void *old)
{
lv_chk_t *lv = container_of(ph, lv_chk_t, ph);
bl_info_t *bi = phase_alloc(ph, sizeof(bi[0]));
* @param irn A node.
* @return 1 if the node shall be considered in liveness, 0 if not.
*/
-static INLINE int is_liveness_node(const ir_node *irn)
+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:
return 0;
- default:;
+ default:
+ break;
}
return 1;
}
-static void compute_back_edge_chain(lv_chk_t *lv, ir_node *bl)
+static void compute_back_edge_chain(lv_chk_t *lv, const ir_node *bl)
{
bitset_t *tmp = bitset_alloca(lv->n_blocks);
bl_info_t *bi = get_block_info(lv, bl);
- bitset_pos_t elm;
+ unsigned elm;
DBG((lv->dbg, LEVEL_2, "computing T_%d\n", bi->id));
}
-static INLINE void compute_back_edge_chains(lv_chk_t *lv)
+static inline void compute_back_edge_chains(lv_chk_t *lv)
{
- bitset_pos_t elm;
+ unsigned elm;
int i, n;
DBG((lv->dbg, LEVEL_2, "back edge sources: %B\n", lv->back_edge_src));
lv_chk_t *lv_chk_new(ir_graph *irg, const dfs_t *dfs)
{
- lv_chk_t *res = xmalloc(sizeof(res[0]));
+ lv_chk_t *res = XMALLOC(lv_chk_t);
struct obstack *obst;
int i;
+ edges_deactivate(irg);
+ edges_activate(irg);
+ compute_doms(irg);
+
stat_ev_tim_push();
- phase_init(&res->ph, "liveness check", irg, PHASE_DEFAULT_GROWTH, init_block_data, NULL);
+ phase_init(&res->ph, irg, init_block_data);
obst = phase_obst(&res->ph);
FIRM_DBG_REGISTER(res->dbg, "ir.ana.lvchk");
res->n_blocks = dfs_get_n_nodes(res->dfs);
res->back_edge_src = bitset_obstack_alloc(obst, res->n_blocks);
res->back_edge_tgt = bitset_obstack_alloc(obst, res->n_blocks);
- res->map = obstack_alloc(obst, res->n_blocks * sizeof(res->map[0]));
+ res->map = OALLOCNZ(obst, bl_info_t*, res->n_blocks);
#if 0
{
for (i = res->n_blocks - 1; i >= 0; --i) {
ir_node *irn = (ir_node *) dfs_get_pre_num_node(res->dfs, i);
bl_info_t *bi = phase_get_or_set_irn_data(&res->ph, irn);
+ assert(bi->id < res->n_blocks);
+ assert(res->map[bi->id] == NULL);
res->map[bi->id] = bi;
}
void lv_chk_free(lv_chk_t *lv)
{
- obstack_free(phase_obst(&lv->ph), NULL);
+ phase_deinit(&lv->ph);
xfree(lv);
}
+#if 0
/**
* Check if a node is live at the end of a block.
* This function is for internal use as its code is shared between
*/
unsigned lv_chk_bl_in_mask(const lv_chk_t *lv, const ir_node *bl, const ir_node *var)
{
- stat_ev_cnt_decl(uses);
-
ir_node *def_bl;
const ir_edge_t *edge;
+ stat_ev_cnt_decl(uses);
+
int res = 0;
assert(is_Block(bl) && "can only check for liveness in a block");
unsigned lv_chk_bl_end_mask(const lv_chk_t *lv, const ir_node *bl, const ir_node *var)
{
- stat_ev_cnt_decl(uses);
-
ir_node *def_bl;
const ir_edge_t *edge;
+ stat_ev_cnt_decl(uses);
+
int res = 0;
assert(is_Block(bl) && "can only check for liveness in a block");
def_bl = get_nodes_block(var);
if (!block_dominates(def_bl, bl)) {
goto end;
- }
-
- else {
+ } else {
bitset_t *uses = bitset_alloca(lv->n_blocks);
bitset_t *tmp = bitset_alloca(lv->n_blocks);
int min_dom = get_Block_dom_tree_pre_num(def_bl) + 1;
end:
return res;
}
+#endif
/**
* Check a nodes liveness situation of a block.
*/
unsigned lv_chk_bl_xxx(const lv_chk_t *lv, const ir_node *bl, const ir_node *var)
{
- stat_ev_cnt_decl(uses);
- stat_ev_cnt_decl(iter);
-
int res = 0;
ir_node *def_bl;
+ stat_ev_cnt_decl(uses);
+ stat_ev_cnt_decl(iter);
assert(is_Block(bl) && "can only check for liveness in a block");
* We try to gather as much information as possible during looking
* at the uses.
*
- * Note that we know for shure that bl != def_bl. That is sometimes
+ * Note that we know for sure that bl != def_bl. That is sometimes
* silently exploited below.
*/
else {
* will be left. */
DBG((lv->dbg, LEVEL_2, "\tbe tgt reach: %B, dom span: [%d, %d]\n", Tq, min_dom, max_dom));
i = bitset_next_set(Tq, min_dom);
- while(i <= max_dom) {
+ while (i <= max_dom) {
bl_info_t *ti = lv->map[i];
int use_in_current_block = bitset_is_set(uses, ti->id);
stat_ev_cnt_inc(iter);
/*
- * This is somehat tricky. Since this routine handles both, live in
+ * This is somewhat tricky. Since this routine handles both, live in
* and end/out we have to handle all the border cases correctly.
* Each node is in its own red_reachable set (see calculation
* function above). That means, that in the case where bl == t, the
- * intersection check of uses and rechability below will always
+ * intersection check of uses and reachability below will always
* find an intersection, namely t.
*
* However, if a block contains a use and the variable is dead
projects / libfirm / blobdiff