RFR: 8346664: C2: Optimize mask check with constant offset [v3]

[Emanuel Peter]

On Thu, 23 Jan 2025 07:04:00 GMT, Matthias Ernst <duke at openjdk.org> wrote:

>> Matthias Ernst has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   (c)
>
> What's left to do here? Thanks!

@mernst-github Thanks for the test update!

I see there is still discussion around this line:
`  return zeros > 0 && ((((jlong)1) << zeros) > mask_t->hi_as_long() && mask_t->lo_as_long() >= 0);`

It is indeed difficult to read. Maybe even just some clever names of temporary variables could help. But I leave that up to you ;)

Ping me when you want me to run testing and review again :)

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PR Comment: https://git.openjdk.org/jdk/pull/22856#issuecomment-2615044394