lenary wrote:

Can we check what this callback is doing against the guidance here and the 
other targets: 
https://llvm.org/docs/InstCombineContributorGuide.html#canonicalization-and-target-independence

It's not clear to me how much we can take subtarget features into account when 
doing these combines. AArch64 seems to take into account the presence or 
absence of streaming mode in their checks (`instCombineSMECntsd`), so maybe 
this is equally ok for us to take into account the vlmin from target features.

https://github.com/llvm/llvm-project/pull/218652
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