> Checking whether the indexes of masked lanes are inside of the valid memory > boundary is necessary for masked vector memory access. However, this could be > saved if the given offset is inside of the vector range that could make sure > no IOOBE (IndexOutOfBoundaryException) happens. The masked load APIs have > saved this kind of check for common cases. And this patch did the similar > optimization for the masked vector store. > > The performance for the new added store masked benchmarks improves about > `1.83x ~ 2.62x` on a x86 system: > > Benchmark Before After Gain Units > StoreMaskedBenchmark.byteStoreArrayMask 12757.936 23291.118 1.826 ops/ms > StoreMaskedBenchmark.doubleStoreArrayMask 1520.932 3921.616 2.578 ops/ms > StoreMaskedBenchmark.floatStoreArrayMask 2713.031 7122.535 2.625 ops/ms > StoreMaskedBenchmark.intStoreArrayMask 4113.772 8220.206 1.998 ops/ms > StoreMaskedBenchmark.longStoreArrayMask 1993.986 4874.148 2.444 ops/ms > StoreMaskedBenchmark.shortStoreArrayMask 8543.593 17821.086 2.086 ops/ms > > Similar performane gain can also be observed on ARM hardware.
Xiaohong Gong has updated the pull request incrementally with one additional commit since the last revision: Wrap the offset check into a static method ------------- Changes: - all: https://git.openjdk.java.net/jdk/pull/8620/files - new: https://git.openjdk.java.net/jdk/pull/8620/files/eb67f681..2229dd24 Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8620&range=01 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8620&range=00-01 Stats: 56 lines in 8 files changed: 5 ins; 0 del; 51 mod Patch: https://git.openjdk.java.net/jdk/pull/8620.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8620/head:pull/8620 PR: https://git.openjdk.java.net/jdk/pull/8620
