[PATCH] D80466: [X86] Improve i8 + 'slow' i16 funnel shift codegen

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

LGTM

For `fshl` case, we could introduce some more ILP: http://volta.cs.utah.edu:8080/z/UJ6viM
https://godbolt.org/z/xsJgPb  https://godbolt.org/z/5W26NV
Not sure it would be an improvement?
As a sidenote, we clearly don't fold to either variant in DAGCombiner.


Repository:
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https://reviews.llvm.org/D80466