RFR (M) 8152753: C1 intrinsics for CompareAndExchange (x86)

Aleksey Shipilev aleksey.shipilev at oracle.com
Thu Apr 7 07:30:36 UTC 2016

On 04/01/2016 05:37 PM, Aleksey Shipilev wrote:
> On 03/25/2016 07:29 PM, Aleksey Shipilev wrote:
>> I would like to solicit comments for C1 support for new
>> Unsafe.compareAndExchange intrinsics (we have support for them in C2).
>> The rest of new Unsafe methods that are not intrinsified by C1 are
>> handled by Java fallbacks in Unsafe.java. compareAndExchange cannot be
>> emulated with existing APIs.
>> Bug:
>>   https://bugs.openjdk.java.net/browse/JDK-8152753
>> Webrev:
>>   http://cr.openjdk.java.net/~shade/8152753/webrev.00/
> Update:
>   http://cr.openjdk.java.net/~shade/8152753/webrev.01/
> Moved flags sensing to vmIntrinsics::is_disabled_by_flags, and did some
> other cleanups.
> Testing: compiler/unsafe regression tests; targeted microbenchmarks; RBT
> hs-comp testset (some unrelated timeouts on SPARC).



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