RFR: 8073108: GHASH Intrinsics

Anthony Scarpino anthony.scarpino at oracle.com
Tue Feb 17 21:00:41 UTC 2015


On 02/17/2015 12:05 PM, Florian Weimer wrote:
> On 02/17/2015 08:59 PM, Anthony Scarpino wrote:
>> On 02/17/2015 12:57 AM, Florian Weimer wrote:
>>> On 02/16/2015 10:11 PM, Anthony Scarpino wrote:
>>>> http://cr.openjdk.java.net/~ascarpino/8073108/jdk/webrev/
>>>
>>> I think the “state” field in GHASH should be final.  Is C2 able to
>>> eliminate the array bounds checks?  (Although it's not in the inner loop
>>> and thus probably not relevant for performance.)
>>
>> I'm not sure want you asking about in regard to the bounds checking? Are
>> you asking about checking the bounds of "state"?
>
> state[0] and state[1]—I wonder if those expressions need array bounds
> checks when compiled.

The glossary says C2 eliminates array range checking.
http://openjdk.java.net/groups/hotspot/docs/HotSpotGlossary.html

Tony



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