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7092905: C2: Keep track of the number of dead nodes

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Keep an (almost) accurate running count of the reachable (live) flow graph nodes.

Reviewed-by: kvn, twisti, jrose, vlivanov
This commit is contained in:
Bharadwaj Yadavalli 2012-11-27 17:24:15 -08:00
parent 96562be9e5
commit 2d2532e740
28 changed files with 306 additions and 120 deletions
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9
hotspot/src/share/vm/opto/phaseX.cpp
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@ -383,6 +383,8 @@ PhaseRemoveUseless::PhaseRemoveUseless( PhaseGVN *gvn, Unique_Node_List *worklis
// Identify nodes that are reachable from below, useful.
C->identify_useful_nodes(_useful);
// Update dead node list
C->update_dead_node_list(_useful);
// Remove all useless nodes from PhaseValues' recorded types
// Must be done before disconnecting nodes to preserve hash-table-invariant
@ -1190,7 +1192,7 @@ void PhaseIterGVN::remove_globally_dead_node( Node *dead ) {
}
}
}
C->record_dead_node(dead->_idx);
if (dead->is_macro()) {
C->remove_macro_node(dead);
}
@ -1199,6 +1201,11 @@ void PhaseIterGVN::remove_globally_dead_node( Node *dead ) {
continue;
}
}
// Constant node that has no out-edges and has only one in-edge from
// root is usually dead. However, sometimes reshaping walk makes
// it reachable by adding use edges. So, we will NOT count Con nodes
// as dead to be conservative about the dead node count at any
// given time.
}
// Aggressively kill globally dead uses