* File name: ir/ana/irextbb2.c
* Purpose: Alternate extended basic block computation
* Author: Matthias Braun
- * Modified by:
* Created: 5.2005
* CVS-ID: $Id$
* Copyright: (c) 2002-2005 Universität Karlsruhe
*/
/**
- * @file irextbb.c
+ * @file irextbb2.c
*
* Alternative algorithm for computing extended basic blocks (using out edges
* and execution frequencies)
typedef struct _env {
struct obstack *obst; /**< the obstack where allocations took place */
ir_extblk *head; /**< head of the list of all extended blocks */
- exec_freq_t *execfreqs;
+ ir_exec_freq *execfreqs;
} env_t;
/**
edge = get_block_succ_first(block);
if (! edge)
return 0;
+
edge = get_block_succ_next(block, edge);
if (! edge)
return 1;
+
edge = get_block_succ_next(block, edge);
return edge ? 3 : 2;
}
static void create_extblk(ir_node *block, env_t *env)
{
- if(irn_visited(block))
+ ir_extblk *extblk;
+
+ if (irn_visited(block))
return;
- ir_extblk *extblk = allocate_extblk(block, env);
+ extblk = allocate_extblk(block, env);
mark_irn_visited(block);
pick_successor(block, extblk, env);
static void pick_successor(ir_node *block, ir_extblk *extblk, env_t *env)
{
const ir_edge_t *edge;
- ir_node *best_succ = NULL;
- double best_execfreq = -1;
-
- /* More than two successors means we have a jump table.
- * we cannot include a jump target into the current extended
- * basic block, so create a new one here.
- */
- if(get_block_n_succs(block) > 2) {
+ ir_node *best_succ = NULL;
+ double best_execfreq = -1;
+
+ /*
+ More than two successors means we have a jump table.
+ we cannot include a jump target into the current extended
+ basic block, so create a new one here.
+ */
+ if (get_block_n_succs(block) > 2) {
const ir_edge_t *edge;
foreach_block_succ(block, edge) {
ir_node *succ = get_edge_src_irn(edge);
double execfreq;
+ if(irn_visited(succ))
+ continue;
+
if(get_Block_n_cfgpreds(succ) > 1) {
create_extblk(succ, env);
continue;
execfreq = get_block_execfreq(env->execfreqs, succ);
- // remember best sucessor and make non best successor with only 1
- // pred block to new extbb leaders
- if(execfreq > best_execfreq) {
- if(best_succ != NULL) {
+ /*
+ Remember best successor and make non best successor with only 1
+ pred block to new extbb leaders.
+ */
+ if (execfreq > best_execfreq) {
+ if (best_succ != NULL) {
create_extblk(best_succ, env);
}
best_execfreq = execfreq;
best_succ = succ;
- } else {
+ }
+ else {
create_extblk(succ, env);
}
}
- // add best successor and recursively try to pick more
+ /* add best successor and recursively try to pick more */
if(best_succ != NULL) {
addto_extblk(extblk, best_succ);
mark_irn_visited(best_succ);
/*
* Compute the extended basic blocks for a graph
*/
-void compute_extbb_execfreqs(ir_graph *irg, exec_freq_t *execfreqs) {
- env_t env;
+void compute_extbb_execfreqs(ir_graph *irg, ir_exec_freq *execfreqs) {
+ env_t env;
ir_extblk *extbb, *next;
- ir_node *endblock;
+ ir_node *endblock;
if (irg->extbb_obst) {
obstack_free(irg->extbb_obst, NULL);
- } else {
+ }
+ else {
irg->extbb_obst = xmalloc(sizeof(*irg->extbb_obst));
}
obstack_init(irg->extbb_obst);
- env.obst = irg->extbb_obst;
- env.head = NULL;
+ env.obst = irg->extbb_obst;
+ env.head = NULL;
env.execfreqs = execfreqs;
assure_irg_outs(irg);
inc_irg_visited(irg);
create_extblk(get_irg_start_block(irg), &env);
- // the end block needs a extbb assigned (even for endless loops)
+ /* the end block needs a extbb assigned (even for endless loops) */
endblock = get_irg_end_block(irg);
- if(!irn_visited(endblock)) {
+ if (! irn_visited(endblock)) {
create_extblk(endblock, &env);
}
/*
- * Ok, we have now the list of all extended blocks starting with env.head
- * every extended block "knowns" the number of blocks in visited and
- * the blocks are linked in link.
- * Now we can create arrays that hold the blocks, some kind of "out" edges
- * for the extended block
- */
+ Ok, we have now the list of all extended blocks starting with env.head
+ every extended block "knowns" the number of blocks in visited and
+ the blocks are linked in link.
+ Now we can create arrays that hold the blocks, some kind of "out" edges
+ for the extended block
+ */
for (extbb = env.head; extbb; extbb = next) {
int i, len = (int)extbb->visited;
ir_node *block;
block = nblock;
}
+#if 0
for(i = 0; i < len; ++i) {
if(i > 0)
printf(", ");
ir_printf("%+F", extbb->blks[i]);
}
printf("\n");
+#endif
extbb->link = NULL;
extbb->visited = 0;
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