RFR[M]: Adding MD5 Intrinsic on x86-64

[Anthony Scarpino]

I had looked at the java code changes and are fine with them

Tony

> On Aug 3, 2020, at 10:10 AM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
> 
> Hi Ludovic
> 
> This is very professional work!
> 
> CCing to Core-libs because you modified Java code and need review from Java library group.
> 
> Few notes:
> 
> Add tests to verify intrinsic implementation. You can use test/hotspot/jtreg/compiler/intrinsics/sha/ as examples.
> 
> In vm_version_x86.cpp move UseMD5Intrinsics flag setting near UseSHA flag setting.
> 
> In new file macroAssembler_x86_md5.cpp no need empty line after copyright line. There is also typo 'rrdistribute':
> 
> * This code is free software; you can rrdistribute it and/or modify it
> 
> Our validate-headers check failed. See GPL header template: ./make/templates/gpl-header
> 
> Ludovic, it looks like you used only general instructions to implement this code. Can you add comment where the algorithm come from? Or it is just direct translation of Java code?
> 
> Vivek, do we have SSE/AVX instructions which may improve performance of this code? It could be follow up update if we can.
> 
> Did you test it on 32-bit x86? Would be interesting to see result of artificially switching off AVX and SSE: '-XX:UseSSE=0 -XX:UseAVX=0'. It will make sure that only general instructions are needed.
> 
> Thanks,
> Vladimir
> 
>> On 8/3/20 7:39 AM, Ludovic Henry wrote:
>> Hi,
>> A quick follow up on that change. Are you happy with the general approach, or would rather have it done differently?
>> JBS: https://bugs.openjdk.java.net/browse/JDK-8250902
>> Webrev: http://cr.openjdk.java.net/~luhenry/8250902/webrev.01/
>> Thank you
>> Ludovic