RFR: 8249893: AARCH64: optimize the construction of the value from the bits of the other two [v6]

[Andrew Haley]

On Thu, 5 Nov 2020 14:08:03 GMT, Andrew Dinn <adinn at openjdk.org> wrote:

> 
> In future I think it would be wise to spend time picking more rewarding candidates for optimization and, more importantly, discussing the likelihood of them being useful on the compiler-dev or aarch64-port lists before proceeding to implement them and present them for a review. That should help to obtain a much better return on effort than that has resulted from this patch.

I have to echo this. Compilation takes time and we should use it wisely. Given the expected advantage of this patch, I simply cannot tell whether it is worth the effort. I suppose we can take some comfort from the fact that C2 only kicks in after a lot of work has been done, but I don't like to be in such a quandary.

-------------

PR: https://git.openjdk.java.net/jdk/pull/511