On Fri, 26 Feb 2021 02:38:00 GMT, Jie Fu <ji...@openjdk.org> wrote:
>> Hi all,
>>
>> Vector API fails to work when:
>> - case 1: MaxVectorSize is set to <=8, or
>> - case 2: C2 is disabled
>>
>> The reason is that {max/preferred} VectorShape initialization fails in both
>> cases.
>> And the root cause is that VectorSupport_GetMaxLaneCount [1] returns
>> unreasonable values (0 for case 1 and -1 for case 2).
>>
>> Vector API should not depend on C2 to run.
>> It should work even there is no JIT compiler since it's a Java-level api.
>> So let's fix it.
>>
>> Testing:
>> - jdk/incubator/vector with -XX:MaxVectorSize=default/8 on Linux/x64
>>
>> Thanks.
>> Best regards,
>> Jie
>>
>> [1]
>> https://github.com/openjdk/jdk/blob/master/src/hotspot/share/prims/vectorSupport.cpp#L364
>
> Jie Fu has updated the pull request incrementally with one additional commit
> since the last revision:
>
> Remove -XX:TieredStopAtLevel=3
Marked as reviewed by psandoz (Reviewer).
-------------
PR: https://git.openjdk.java.net/jdk/pull/2722
