JDK-8261008 : Optimize Xor
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 17
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2021-02-03
- Updated: 2023-10-23
- Resolved: 2021-03-06
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| JDK 17 |
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17 b13Fixed  |
Related Reports
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Relates :
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Description
1). x ^ x ==> 0 2). Const ^ x ==> x ^ Const, so that GVN could replace with the pre-existed node. 3). x ^ y ==> x, if y is constant zero. 4). x ^ y ==> ~x, if y is constant bit mask value. See https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-November/041798.html for more detail.
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