dcaballe wrote:

Thanks for the info! I think making the interleave op at Vector level available 
to fixed vectors would also make sense. There is a point in knowing that a 
shuffle is actually implementing an interleave pattern.

I guess we should also be fine with this LLVM limitations for now:
```
While this intrinsic supports all vector types the recommended way to express 
this operation for fixed-width vectors is still to use a shufflevector, as that 
may allow for more optimization opportunities.
```

Again, if looks like we are building a small ad-hoc backend in here. Ultimately 
we may want this to be properly supported in LLVM.

https://github.com/llvm/llvm-project/pull/79494
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