[PATCH] D117499: [CodeGen] Support extracting fixed-length vectors from illegal scalable vectors

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

I'm okay with skipping the select optimization for now, sure.



================
Comment at: llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp:3034
+  if (SubVT.getScalarType() == MVT::i1 &&
+      getTypeAction(SubVT) != TargetLowering::TypePromoteInteger)
+    llvm_unreachable("Don't know how to extract fixed-width predicate "
----------------
`getTypeAction(SubVT)` is always going to be "legal", or we wouldn't be here.  (We always legalize results before operands.)


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  https://reviews.llvm.org/D117499/new/

https://reviews.llvm.org/D117499