nikic wrote:

I think this is the right canonicalization at the IR level, as select allows 
better analysis than zext(icmp). However, this seems to be universally worse 
for the backend: https://llvm.godbolt.org/z/Yh7brfc8b So I think we would need 
an SDAG undo transform. Interestingly, this already happens for riscv64, so 
maybe the undo transform already exists but is not enabled for all target.

@goldsteinn What do you think?

https://github.com/llvm/llvm-project/pull/66740
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