Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/opto/loopnode.cpp
src/share/vm/opto/loopnode.cpp
- changeset 9922
- f7691a80458c
- parent 9910
- 4373df7c4a92
- child 9931
- fd44df5e3bc3
- child 9977
- e649f2136368
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| 9921:9cbafea410f5 | 9922:f7691a80458c |
|---|---|
| 1 /* | 1 /* |
| 2 * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved. | 2 * Copyright (c) 1998, 2020, 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. |
| 1536 assert( phase->is_member( this, _head->in(2) ), "right edge is loop" ); | 1536 assert( phase->is_member( this, _head->in(2) ), "right edge is loop" ); |
| 1537 | 1537 |
| 1538 // If I am a shared header (multiple backedges), peel off the many | 1538 // If I am a shared header (multiple backedges), peel off the many |
| 1539 // backedges into a private merge point and use the merge point as | 1539 // backedges into a private merge point and use the merge point as |
| 1540 // the one true backedge. | 1540 // the one true backedge. |
| 1541 if (_head->req() > 3 && !_irreducible) { | 1541 if (_head->req() > 3) { |
| 1542 // Merge the many backedges into a single backedge but leave | 1542 // Merge the many backedges into a single backedge but leave |
| 1543 // the hottest backedge as separate edge for the following peel. | 1543 // the hottest backedge as separate edge for the following peel. |
| 1544 merge_many_backedges( phase ); | 1544 if (!_irreducible) { |
| 1545 merge_many_backedges( phase ); | |
| 1546 } | |
| 1547 | |
| 1548 // When recursively beautify my children, split_fall_in can change | |
| 1549 // loop tree structure when I am an irreducible loop. Then the head | |
| 1550 // of my children has a req() not bigger than 3. Here we need to set | |
| 1551 // result to true to catch that case in order to tell the caller to | |
| 1552 // rebuild loop tree. See issue JDK-8244407 for details. | |
| 1545 result = true; | 1553 result = true; |
| 1546 } | 1554 } |
| 1547 | 1555 |
| 1548 // If I have one hot backedge, peel off myself loop. | 1556 // If I have one hot backedge, peel off myself loop. |
| 1549 // I better be the outermost loop. | 1557 // I better be the outermost loop. |
