755 // 4799512: Stop split_if_with_blocks from splitting a block with a ConvI2LNode
756 // having a PhiNode input. This sidesteps the dangerous case where the split
757 // ConvI2LNode may become TOP if the input Value() does not
758 // overlap the ConvI2L range, leaving a node which may not dominate its
759 // uses.
760 // A better fix for this problem can be found in the BugTraq entry, but
761 // expediency for Mantis demands this hack.
762 // 6855164: If the merge point has a FastLockNode with a PhiNode input, we stop
763 // split_if_with_blocks from splitting a block because we could not move around
764 // the FastLockNode.
765 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) {
766 Node* n = region->fast_out(i);
767 if (n->is_Phi()) {
768 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
769 Node* m = n->fast_out(j);
770 if (m->is_FastLock())
771 return false;
772 #ifdef _LP64
773 if (m->Opcode() == Op_ConvI2L)
774 return false;
775 #endif
776 }
777 }
778 }
779 return true;
780 }
781
782
783 //------------------------------place_near_use---------------------------------
784 // Place some computation next to use but not inside inner loops.
785 // For inner loop uses move it to the preheader area.
786 Node *PhaseIdealLoop::place_near_use( Node *useblock ) const {
787 IdealLoopTree *u_loop = get_loop( useblock );
788 return (u_loop->_irreducible || u_loop->_child)
789 ? useblock
790 : u_loop->_head->in(LoopNode::EntryControl);
791 }
792
793
794 //------------------------------split_if_with_blocks_post----------------------
|
755 // 4799512: Stop split_if_with_blocks from splitting a block with a ConvI2LNode
756 // having a PhiNode input. This sidesteps the dangerous case where the split
757 // ConvI2LNode may become TOP if the input Value() does not
758 // overlap the ConvI2L range, leaving a node which may not dominate its
759 // uses.
760 // A better fix for this problem can be found in the BugTraq entry, but
761 // expediency for Mantis demands this hack.
762 // 6855164: If the merge point has a FastLockNode with a PhiNode input, we stop
763 // split_if_with_blocks from splitting a block because we could not move around
764 // the FastLockNode.
765 for (DUIterator_Fast imax, i = region->fast_outs(imax); i < imax; i++) {
766 Node* n = region->fast_out(i);
767 if (n->is_Phi()) {
768 for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
769 Node* m = n->fast_out(j);
770 if (m->is_FastLock())
771 return false;
772 #ifdef _LP64
773 if (m->Opcode() == Op_ConvI2L)
774 return false;
775 if (m->is_CastII() && m->isa_CastII()->has_range_check()) {
776 return false;
777 }
778 #endif
779 }
780 }
781 }
782 return true;
783 }
784
785
786 //------------------------------place_near_use---------------------------------
787 // Place some computation next to use but not inside inner loops.
788 // For inner loop uses move it to the preheader area.
789 Node *PhaseIdealLoop::place_near_use( Node *useblock ) const {
790 IdealLoopTree *u_loop = get_loop( useblock );
791 return (u_loop->_irreducible || u_loop->_child)
792 ? useblock
793 : u_loop->_head->in(LoopNode::EntryControl);
794 }
795
796
797 //------------------------------split_if_with_blocks_post----------------------
|