RFR: 8282221: x86 intrinsics for divideUnsigned and remainderUnsigned methods in java.lang.Integer and java.lang.Long
Vamsi Parasa
duke at openjdk.java.net
Tue Feb 22 18:29:21 UTC 2022
Optimizes the divideUnsigned() and remainderUnsigned() methods in java.lang.Integer and java.lang.Long classes using x86 intrinsics. This change shows 3x improvement for Integer methods and upto 25% improvement for Long. This change also implements the DivMod optimization which fuses division and modulus operations if needed. The DivMod optimization shows 3x improvement for Integer and ~65% improvement for Long.
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Commit messages:
- fix trailing white space errors
- fix whitespaces
- revert comment to original for divmodI
- Update rax and rdx register usage in x86_64.ad
- 8282221: x86 intrinsics for divideUnsigned and remainderUnsigned methods in java.lang.Integer and java.lang.Long
Changes: https://git.openjdk.java.net/jdk/pull/7572/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7572&range=00
Issue: https://bugs.openjdk.java.net/browse/JDK-8282221
Stats: 741 lines in 16 files changed: 738 ins; 1 del; 2 mod
Patch: https://git.openjdk.java.net/jdk/pull/7572.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/7572/head:pull/7572
PR: https://git.openjdk.java.net/jdk/pull/7572
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