diff options
Diffstat (limited to 'src/share/vm/opto/loopTransform.cpp')
| -rw-r--r-- | src/share/vm/opto/loopTransform.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/share/vm/opto/loopTransform.cpp b/src/share/vm/opto/loopTransform.cpp index 7ef67c155..e3637b652 100644 --- a/src/share/vm/opto/loopTransform.cpp +++ b/src/share/vm/opto/loopTransform.cpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it @@ -2231,6 +2231,13 @@ bool IdealLoopTree::policy_do_remove_empty_loop( PhaseIdealLoop *phase ) { // We also need to replace the original limit to collapse loop exit. Node* cmp = cl->loopexit()->cmp_node(); assert(cl->limit() == cmp->in(2), "sanity"); + // Duplicate cmp node if it has other users + if (cmp->outcnt() > 1) { + cmp = cmp->clone(); + cmp = phase->_igvn.register_new_node_with_optimizer(cmp); + BoolNode *bol = cl->loopexit()->in(CountedLoopEndNode::TestValue)->as_Bool(); + phase->_igvn.replace_input_of(bol, 1, cmp); // put bol on worklist + } phase->_igvn._worklist.push(cmp->in(2)); // put limit on worklist phase->_igvn.replace_input_of(cmp, 2, exact_limit); // put cmp on worklist } |