RFR: 8288303: C1: Miscompilation due to broken Class.getModifiers intrinsic [v2]

[Aleksey Shipilev]

On Mon, 13 Jun 2022 17:14:19 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Looks like another instance when compilicated control flow in C1 LIR intrinsic confuses the C1 regalloc into miscompiling. Reliably reproduces on selected JFR tests in selected configurations, and I was unable to reproduce it in smaller test.
>> 
>> Additional testing:
>>  - [x] JFR reproducers now pass
>>  - [x] Linux x86_64 fastdebug `tier1`
>>  - [x] Linux x86_32 fastdebug `tier1`
>>  - [x] Linux x86_64 fastdebug `tier2`
>>  - [x] Linux x86_32 fastdebug `tier2`
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add test

Thanks for reviews!

-------------

PR: https://git.openjdk.org/jdk19/pull/8