RFR: 8260355: AArch64: deoptimization stub should save vector registers [v4]

[Andrew Haley]

On 2/4/21 10:03 AM, Vladimir Ivanov wrote:
> 
>>> I've also previously run the tier1 and java/incubator/vector/* tests
>>> with -XX:+DeoptimizeALot. My experience of modifying that code is that
>>> DeoptimizeALot fails pretty quickly if you get something wrong.
>>
>> Yeah. The problem here is that safepoints with live vectors aren't so
>> common, so it's hard to test, I get it. Maybe this will have to do.
> 
> FTR jdk/java/incubator/vector tests w/ -XX:+DeoptimizeALot are very good 
> at verifying that in-register vector values are properly preserved: 
> vectors (as exposed by Vector API) are routinely kept in registers 
> across safepoints and during deoptimization they are rematerialized into 
> full-blown Vector instances, so the tests fail quickly on broken vector 
> values.

Great, thanks.

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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