RFR: 8266332: Adler32 intrinsic for x86 64-bit platforms [v2]

[eric.caspole at oracle.com]

Hi Xubo, could you please make your JMH, noted below, conform to the 
others in, say, test/micro/org/openjdk/bench/java/util/ and it to to 
your PR. The JMH is useful work too and others could reuse it later.
Thanks,
Eric


On 4/30/21 3:57 PM, Xubo Zhang wrote:
>> Implement Adler32 intrinsic for x86 64-bit platform using vector instructions.
>>
>> For the following benchmark:
>> http://cr.openjdk.java.net/~pli/rfr/8216259/TestAdler32.java
>>
>> The optimization shows ~5x improvement.
>>
>> Base:
>> Benchmark (count) Mode Cnt Score Error Units
>> TestAdler32Perf.testAdler32Update 64 avgt 25 0.084 ± 0.001 us/op
>> TestAdler32Perf.testAdler32Update 128 avgt 25 0.104 ± 0.001 us/op
>> TestAdler32Perf.testAdler32Update 256 avgt 25 0.146 ± 0.002 us/op
>> TestAdler32Perf.testAdler32Update 512 avgt 25 0.226 ± 0.002 us/op
>> TestAdler32Perf.testAdler32Update 1024 avgt 25 0.390 ± 0.005 us/op
>> TestAdler32Perf.testAdler32Update 2048 avgt 25 0.714 ± 0.007 us/op
>> TestAdler32Perf.testAdler32Update 4096 avgt 25 1.359 ± 0.014 us/op
>> TestAdler32Perf.testAdler32Update 8192 avgt 25 2.751 ± 0.023 us/op
>> TestAdler32Perf.testAdler32Update 16384 avgt 25 5.494 ± 0.077 us/op
>> TestAdler32Perf.testAdler32Update 32768 avgt 25 11.058 ± 0.160 us/op
>> TestAdler32Perf.testAdler32Update 65536 avgt 25 22.198 ± 0.319 us/op
>>
>>
>> With patch:
>> Benchmark (count) Mode Cnt Score Error Units
>> TestAdler32Perf.testAdler32Update 64 avgt 25 0.020 ± 0.001 us/op
>> TestAdler32Perf.testAdler32Update 128 avgt 25 0.025 ± 0.001 us/op
>> TestAdler32Perf.testAdler32Update 256 avgt 25 0.031 ± 0.001 us/op
>> TestAdler32Perf.testAdler32Update 512 avgt 25 0.048 ± 0.001 us/op
>> TestAdler32Perf.testAdler32Update 1024 avgt 25 0.078 ± 0.001 us/op
>> TestAdler32Perf.testAdler32Update 2048 avgt 25 0.139 ± 0.002 us/op
>> TestAdler32Perf.testAdler32Update 4096 avgt 25 0.262 ± 0.004 us/op
>> TestAdler32Perf.testAdler32Update 8192 avgt 25 0.524 ± 0.010 us/op
>> TestAdler32Perf.testAdler32Update 16384 avgt 25 1.017 ± 0.022 us/op
>> TestAdler32Perf.testAdler32Update 32768 avgt 25 2.058 ± 0.052 us/op
>> TestAdler32Perf.testAdler32Update 65536 avgt 25 3.994 ± 0.013 us/op
> Xubo Zhang has updated the pull request incrementally with one additional commit since the last revision:
>
>    refactor adler32 algorithm to a new file x86/macroAssembler_x86_adler.cpp; added a scratch reg to vpmulld, and some other issues
>
> -------------
>
> Changes:
>    - all: https://git.openjdk.java.net/jdk/pull/3806/files
>    - new: https://git.openjdk.java.net/jdk/pull/3806/files/c2b5a126..9d8e0230
>
> Webrevs:
>   - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3806&range=01
>   - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3806&range=00-01
>
>    Stats: 387 lines in 4 files changed: 210 ins; 169 del; 8 mod
>    Patch: https://git.openjdk.java.net/jdk/pull/3806.diff
>    Fetch: git fetch https://git.openjdk.java.net/jdk pull/3806/head:pull/3806
>
> PR: https://git.openjdk.java.net/jdk/pull/3806