RFR (S) 8150669: C1 intrinsic for Class.isPrimitive

Aleksey Shipilev aleksey.shipilev at oracle.com
Mon Feb 29 21:58:59 UTC 2016

On 03/01/2016 12:46 AM, Christian Thalinger wrote:
>> I would like to amend C1 with handling Class.isPrimitive intrinsic:
>>  http://cr.openjdk.java.net/~shade/8150669/webrev.01/
>>  https://bugs.openjdk.java.net/browse/JDK-8150669
>> Through a long chain of dependencies, it would benefit String
>> concatenation, possibly startup (lots of usages in java.lang.invoke, and
>> who knows how many other places in JDK that use reflective meddling),
>> and also, for a fun of it, fastdebug builds.
> Can you explain the fastdebug comment a bit?  Have we seen real issues or is this just a nice side-effect?

See the notes at the bottom:

Nice side-effect of not going through Java-to-native transition. The
patch coincided with Zoltan trying to trim down on (fastdebug) testing
time, so I mentioned that for fun.


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