RFR: 8325467: Support methods with many arguments in C2 [v10]

[Roberto Castañeda Lozano]

On Mon, 24 Mar 2025 15:35:33 GMT, Daniel Lundén <dlunden at openjdk.org> wrote:

>> src/hotspot/share/opto/regmask.hpp line 188:
>> 
>>> 186:   // all registers/stack locations under _lwm and over _hwm are excluded.
>>> 187:   // The exception is (s10, s11, ...), where the value is decided solely by
>>> 188:   // _all_stack, regardless of the value of _hwm.
>> 
>> This comment illustrates the case with `_offset = 0`, I think it would be useful to extend it with an example where `_offset > 0`. Here is a suggestion: https://github.com/openjdk/jdk/commit/8377012ac485a70703921822d58bc535bafb7a0a. Feel free to merge as-is or edit to your liking, if you agree.
>
> Looks good to me, now merged. There are likely other opportunities for more source code comment illustrations throughout `regmask.hpp`. `SUBTRACT_inner` and `overlap` comes to mind, in particular. I'll have a look and see what can be improved.

Thanks, Daniel!

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PR Review Comment: https://git.openjdk.org/jdk/pull/20404#discussion_r2011688122