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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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2
hotspot/src/share/vm/opto/loopUnswitch.cpp
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@ -59,7 +59,7 @@ bool IdealLoopTree::policy_unswitching( PhaseIdealLoop *phase ) const {
if (!_head->is_Loop()) {
return false;
}
uint nodes_left = MaxNodeLimit - phase->C->unique();
uint nodes_left = MaxNodeLimit - phase->C->live_nodes();
if (2 * _body.size() > nodes_left) {
return false; // Too speculative if running low on nodes.
}