RFR: 8252848: Optimize small primitive arrayCopy operations through partial inlining using AVX-512 masked instructions [v11]

[Jatin Bhateja]

On Fri, 6 Nov 2020 01:02:43 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> src/hotspot/cpu/x86/vm_version_x86.cpp line 1423:
>> 
>>> 1421:     if (ArrayCopyPartialInlineSize > MaxVectorSize) {
>>> 1422:       ArrayCopyPartialInlineSize = MaxVectorSize;
>>> 1423:       warning("Setting ArrayCopyPartialInlineSize as MaxVectorSize");
>> 
>> warning only if ArrayCopyPartialInlineSize is not default.
>
> I don't see your fix for my comment. I asked to add `if(!FLAG_IS_DEFAULT(ArrayCopyPartialInlineSize))` check

Default value for ArrayCopyPartialInlineSize = -1 with a value range [-1,64], default value for MaxVectorSize=0 with a value range [0,max_int]; control flow will be reaching to this warning only for a non-default value of ArrayCopyPartialInlineSize.

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PR: https://git.openjdk.java.net/jdk/pull/302