RFR: JDK-8294902: Undefined Behavior in C2 regalloc with null references [v3]

[Andrew Haley]

On Thu, 17 Nov 2022 16:55:53 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> > > Changes are good. Can you tell more about `-fsanitize=null` effect on libjvm size and performance of fastdebug build we use in testing? If it is only few percents I am for enabling it in debug build.
> > 
> > 
> > It might be a bit more than that: it's a test-and-branch on every memory access. Maybe enable it only on a non-optimized build?
> 
> I am fine with enabling it for debug VM. But can you give at least some numbers?

Sorry I'm being slow on this. I'm trying to get scoped values done before the fork.

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PR: https://git.openjdk.org/jdk/pull/10920