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<p class="MsoNormal">Hi Eirik,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Yes, it will be wonderful to add this benchmark. Please go ahead and create a PR.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If there are objections to adding it to mainline JDK, we could fall back to the panama-vectror vectorIntrinsics branch.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal">Sandhya<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> panama-dev <panama-dev-retn@openjdk.org> <b>On Behalf Of
</b>Eirik Bjørsnøs<br>
<b>Sent:</b> Tuesday, February 21, 2023 2:56 AM<br>
<b>To:</b> panama-dev@openjdk.org<br>
<b>Subject:</b> Vectorized latin1 equalsIgnoreCase<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I've been working on <a href="https://github.com/openjdk/jdk/pull/12623">
https://github.com/openjdk/jdk/pull/12623</a> (which speeds up latin1 equalsIgnoreCase using 'the oldest ASCII trick in the book).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I was thinking that this trick could lend itself to vectorization, so I made a quick exploration using the Vector API. (JMH results below)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">While a vectorized implementation is out of scope for the current PR, perhaps it could be useful to include this benchmark along the Vector API benchmarks?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It's my first time writing Vector API code (or any SIMD code at all), so this could probably be improved (a lot!):<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="https://github.com/openjdk/jdk/compare/master...eirbjo:jdk:vectorized-equalsignorecase">https://github.com/openjdk/jdk/compare/master...eirbjo:jdk:vectorized-equalsignorecase</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Let me know if there is interest in including this, and I can go ahead and make a PR.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers, <o:p></o:p></p>
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<p class="MsoNormal">Eirik.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Results:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Benchmark (size) Mode Cnt Score Error Units<br>
EqualsIgnoreCaseBenchmark.scalar 16 avgt 15 20.671 ± 0.718 ns/op<br>
EqualsIgnoreCaseBenchmark.scalar 32 avgt 15 46.155 ± 3.258 ns/op<br>
EqualsIgnoreCaseBenchmark.scalar 64 avgt 15 68.248 ± 1.767 ns/op<br>
EqualsIgnoreCaseBenchmark.scalar 128 avgt 15 148.948 ± 0.890 ns/op<br>
EqualsIgnoreCaseBenchmark.scalar 1024 avgt 15 1090.708 ± 7.540 ns/op<br>
EqualsIgnoreCaseBenchmark.vectorized 16 avgt 15 21.872 ± 0.232 ns/op<br>
EqualsIgnoreCaseBenchmark.vectorized 32 avgt 15 11.378 ± 0.097 ns/op<br>
EqualsIgnoreCaseBenchmark.vectorized 64 avgt 15 13.703 ± 0.135 ns/op<br>
EqualsIgnoreCaseBenchmark.vectorized 128 avgt 15 21.632 ± 0.735 ns/op</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">EqualsIgnoreCaseBenchmark.vectorized 1024 avgt 15 105.509 ± 7.493 ns/op</span> <o:p></o:p></p>
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