RFR: 8257815: Replace global log2 functions with efficient implementations [v11]

[Claes Redestad]

On Thu, 17 Dec 2020 12:09:50 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>>> Hi Claes,
>>> I noticed that you're using `log2i_exact` in ppc.ad. That's wrong, we're hitting assertions because it's not used for exact powers of 2. Please change to `log2i`. I'll test with that change.
>> 
>> To have the same semantics as before I guess `log2i_graceful` is the better fit. I picked `log2i_exact` since the variable names suggested they were powers of two.
>
> You're right, looks like `log2i_exact` should be used and only braces are wrong. I'll try to fix it and get back to you. Thanks for your patience.

I've merged in a patch to ppc.ad from @TheRealMDoerr that has passed testing on PPC. I'm running a few tiers of testing now with the intent of pushing this later tonight.

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PR: https://git.openjdk.java.net/jdk/pull/1663