Auto merge of #132238 - Urgau:midpoint-i64-hackers-impl, r=joboet

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Use Hacker's Delight impl in `i64::midpoint` instead of wide `i128` impl

This PR switches `i64::midpoint` and (`isize::midpoint` where `isize == i64`) to using our Hacker's Delight impl instead of wide `i128` implementation.

As LLVM seems to be outperformed by the complexity of signed 128-bits number compared to our Hacker's Delight implementation.[^1]

It doesn't seems like it's an improvement for the other sizes[^2], so we let them with the wide implementation.

[^1]: https://rust.godbolt.org/z/ravE75EYj
[^2]: https://rust.godbolt.org/z/fzr171zKh

r? libs

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bors 2024-10-30 02:26:18 +00:00

parent 635a75efe4 bfeadff2b2

commit 68076e1685

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