nikic wrote:

> So not exactly correctness, but so much performance that it effectively 
> equates to correctness?

Yes, basically.

Some related issues: https://github.com/rust-lang/rust/issues/131745 (can't use 
get_unchecked) https://github.com/rust-lang/stdarch/pull/1964 (can't use 
vreinterpret)

This *seems* like a relatively safe backport to me because it just extends the 
feature whitelist (which I believe is unique to ARM, I don't think any other 
target handles these via a whitelist and assumes superset compatibility by 
default). On the other hand, the issue is not exactly new, so waiting another 
release isn't the end of the world either.

https://github.com/llvm/llvm-project/pull/177974
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