RFR: 8325467: Support methods with many arguments in C2 [v4]

[Dean Long]

On Mon, 9 Sep 2024 12:16:47 GMT, Daniel Lundén <dlunden at openjdk.org> wrote:

> Add a STATIC_ASSERT that short can index the maximum size register mask.

This assumes the types in OptoRegPair won't change.  Something more future-proof would be to try to construct an OptoRegPair with RM_SIZE_MAX >> 5, then try to read it back.  We should probably have OptoRegPair check input values for overflow while we are at it.

> Add an upper bound for register mask growth

Does this mean "AllStack" no longer means infinite?

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PR Comment: https://git.openjdk.org/jdk/pull/20404#issuecomment-2347482489