RFR: 8367341: C2: apply KnownBits and unsigned bounds to And / Or operations

[Quan Anh Mai]

On Fri, 3 Oct 2025 06:07:50 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

> Hi,
> 
> This PR improves the implementation of `AndNode/OrNode/XorNode::Value` by taking advantages of the additional information in `TypeInt`. The implementation is pretty straightforward. A clever trick is that by analyzing the negative and positive ranges of a `TypeInt` separately, we have better info for the leading bits. I also implement gtest unit tests to verify the correctness and monotonicity of the inference functions.
> 
> Please take a look and leave your reviews, thanks a lot.

@eme64 I think it would be great if you take a look at this PR.

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PR Comment: https://git.openjdk.org/jdk/pull/27618#issuecomment-3397036741