Feature request: shuffle methods

[RReverser]

Looks like LLVM autovectorizer struggles with turning array operations into shuffles, so direct control would be very welcome. This would be particularly useful for things like bitonic sorting.

[Lokathor]

I'd love to have this. I think the shuffle pattern has to be a const value on x86, which might make it awkward, but even so it's a good idea.

If someone does the PR I'll try to review it as quickly as possible.

[RReverser]

I think the shuffle pattern has to be a const value on x86

Yeah, IIRC stdlib intrinsics solve this by taking such params (in shuffle and other ops with similar restriction) via const generics.

Same should work here.

[mcroomp]

What stable intrinsics would this translate to? Sadly most of the < 32 bit shuffle intrinsics are kind of special case

[Lokathor]

presumably these ones: https://docs.rs/safe_arch/latest/safe_arch/?search=shuffle