RFR: 8304049: C2 can not merge trivial Ifs due to CastII

Wed Mar 15 15:56:49 UTC 2023

On Wed, 15 Mar 2023 12:43:59 GMT, Yi Yang <yyang at openjdk.org> wrote:

> For carry_dependency, please let me do more investigation later to make sure they can be safely removed.

`carry_dependency` true or not, removing a Cast node must be done with care as it removes a dependency. There have been numerous bugs over the year when dependencies were simply dropped because they got in the way of some other transformation.

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PR: https://git.openjdk.org/jdk/pull/13039