RFR: 8271600: C2: CheckCastPP which should closely follow Allocate is sunk of a loop [v2]

[Roland Westrelin]

On Mon, 23 Aug 2021 13:18:48 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> Ok, I'm fine with limiting the fix for raw-to-oop casts only.

Thanks for making the change.

> > The change you propose would then prevent sinking out of the outer loop.
> 
> I thought that the code at [loopopts.cpp#L1481](https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/loopopts.cpp#L1481) would handle it. Anyway.

Right. Sinking out of the outer loop wouldn't be prevented.

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PR: https://git.openjdk.java.net/jdk/pull/5199