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7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post

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Removed predicate cloning from loop peeling optimization and from split fall-in paths.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2011-07-29 09:16:29 -07:00
parent e30a679033
commit df8d608ac7
8 changed files with 33 additions and 138 deletions
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7
hotspot/src/share/vm/opto/loopTransform.cpp
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@ -509,14 +509,13 @@ void PhaseIdealLoop::do_peeling( IdealLoopTree *loop, Node_List &old_new ) {
// backedges) and then map to the new peeled iteration. This leaves
// the pre-loop with only 1 user (the new peeled iteration), but the
// peeled-loop backedge has 2 users.
Node* new_exit_value = old_new[head->in(LoopNode::LoopBackControl)->_idx];
new_exit_value = move_loop_predicates(entry, new_exit_value, !counted_loop);
Node* new_entry = old_new[head->in(LoopNode::LoopBackControl)->_idx];
_igvn.hash_delete(head);
head->set_req(LoopNode::EntryControl, new_exit_value);
head->set_req(LoopNode::EntryControl, new_entry);
for (DUIterator_Fast jmax, j = head->fast_outs(jmax); j < jmax; j++) {
Node* old = head->fast_out(j);
if (old->in(0) == loop->_head && old->req() == 3 && old->is_Phi()) {
new_exit_value = old_new[old->in(LoopNode::LoopBackControl)->_idx];
Node* new_exit_value = old_new[old->in(LoopNode::LoopBackControl)->_idx];
if (!new_exit_value ) // Backedge value is ALSO loop invariant?
// Then loop body backedge value remains the same.
new_exit_value = old->in(LoopNode::LoopBackControl);