Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/opto/loopTransform.cpp
src/share/vm/opto/loopTransform.cpp
- changeset 9806
- 758c07667682
- parent 9756
- 2be326848943
- parent 9772
- eee5798e1b28
- child 10015
- eb7ce841ccec
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| 9762:c97db0855565 | 9806:758c07667682 |
|---|---|
| 1 /* | 1 /* |
| 2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. | 2 * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | 4 * |
| 5 * This code is free software; you can redistribute it and/or modify it | 5 * This code is free software; you can redistribute it and/or modify it |
| 6 * under the terms of the GNU General Public License version 2 only, as | 6 * under the terms of the GNU General Public License version 2 only, as |
| 7 * published by the Free Software Foundation. | 7 * published by the Free Software Foundation. |
| 2229 Node *exact_limit = phase->exact_limit(this); | 2229 Node *exact_limit = phase->exact_limit(this); |
| 2230 if (exact_limit != cl->limit()) { | 2230 if (exact_limit != cl->limit()) { |
| 2231 // We also need to replace the original limit to collapse loop exit. | 2231 // We also need to replace the original limit to collapse loop exit. |
| 2232 Node* cmp = cl->loopexit()->cmp_node(); | 2232 Node* cmp = cl->loopexit()->cmp_node(); |
| 2233 assert(cl->limit() == cmp->in(2), "sanity"); | 2233 assert(cl->limit() == cmp->in(2), "sanity"); |
| 2234 // Duplicate cmp node if it has other users | |
| 2235 if (cmp->outcnt() > 1) { | |
| 2236 cmp = cmp->clone(); | |
| 2237 cmp = phase->_igvn.register_new_node_with_optimizer(cmp); | |
| 2238 BoolNode *bol = cl->loopexit()->in(CountedLoopEndNode::TestValue)->as_Bool(); | |
| 2239 phase->_igvn.replace_input_of(bol, 1, cmp); // put bol on worklist | |
| 2240 } | |
| 2234 phase->_igvn._worklist.push(cmp->in(2)); // put limit on worklist | 2241 phase->_igvn._worklist.push(cmp->in(2)); // put limit on worklist |
| 2235 phase->_igvn.replace_input_of(cmp, 2, exact_limit); // put cmp on worklist | 2242 phase->_igvn.replace_input_of(cmp, 2, exact_limit); // put cmp on worklist |
| 2236 } | 2243 } |
| 2237 // Note: the final value after increment should not overflow since | 2244 // Note: the final value after increment should not overflow since |
| 2238 // counted loop has limit check predicate. | 2245 // counted loop has limit check predicate. |
