src/share/vm/opto/loopTransform.cpp
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*** old/src/share/vm/opto/loopTransform.cpp	Wed May 18 15:31:42 2011
--- new/src/share/vm/opto/loopTransform.cpp	Wed May 18 15:31:41 2011

*** 1290,1302 **** --- 1290,1316 ---- } register_new_node(new_limit, ctrl); } assert(new_limit != NULL, ""); // Replace in loop test. + assert(loop_end->in(1)->in(1) == cmp, "sanity"); + if (cmp->outcnt() == 1 && loop_end->in(1)->outcnt() == 1) { + // Don't need to create new test since only one user. _igvn.hash_delete(cmp); cmp->set_req(2, new_limit); + } else { + // Create new test since it is shared. + Node* ctrl2 = loop_end->in(0); + Node* cmp2 = cmp->clone(); + cmp2->set_req(2, new_limit); + register_new_node(cmp2, ctrl2); + Node* bol2 = loop_end->in(1)->clone(); + bol2->set_req(1, cmp2); + register_new_node(bol2, ctrl2); + _igvn.hash_delete(loop_end); + loop_end->set_req(1, bol2); + } // Step 3: Find the min-trip test guaranteed before a 'main' loop. // Make it a 1-trip test (means at least 2 trips). // Guard test uses an 'opaque' node which is not shared. Hence I // can edit it's inputs directly. Hammer in the new limit for the

src/share/vm/opto/loopTransform.cpp
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