RFR(M): 6700100: optimize inline_native_clone() for small objects with exact klass

[Vladimir Kozlov]

This looks good.

Thanks,
Vladimir

On 10/23/14 4:50 AM, Roland Westrelin wrote:
> Vladimir,
>
> Here is a new webrev that takes your comments into account:
>
> http://cr.openjdk.java.net/~roland/6700100/webrev.01/
>
> I moved the ik->has_injected_fields() call last in ArrayCopyNode::get_count() and added a comment.
>
> I improved the code in fieldStreams.hpp
>
> LibraryCallKit::inline_arraycopy() had what turned out to be the fix for JDK-8060252 (performance regression on sparc). I removed it so it can be pushed as a separate fix.
>
> Roland.
>
>
>> On Oct 10, 2014, at 9:31 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
>>
>> I was thinking aloud :)
>>
>> Changes are good as it is. Thank you for discussion.
>>
>> Thanks,
>> Vladimir
>>
>> On 10/10/14 10:47 AM, Roland Westrelin wrote:
>>>>> If we wanted to delay that transformation, wouldn’t we also want a few passes of IGVN to happen before we do the transformation?
>>>>
>>>> The thing which can be improved is klass exactness. Which will allow to skip adding dependency. That is what I was thinking. But it may only happen after CCP phase. But I really want to do this optimization before EA which will greatly benefit from it. Also if klass is exact during parsing we may do optimization during parsing too.
>>>
>>> Ok. But I’m not sure if you’re suggesting a change or if it’s good as it is?
>>>
>>> Roland.
>>>
>