[llvm] [LegalizeTypes] Handle non byte-sized elt types when splitting INSERT/EXTRACT_VECTOR_ELT (PR #93357)

[Matt Arsenault via llvm-commits]

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@@ -3443,11 +3438,13 @@ SDValue DAGTypeLegalizer::SplitVecOp_EXTRACT_VECTOR_ELT(SDNode *N) {
   // Make the vector elements byte-addressable if they aren't already.
   SDLoc dl(N);
   EVT EltVT = VecVT.getVectorElementType();
-  if (VecVT.getScalarSizeInBits() < 8) {
-    EltVT = MVT::i8;
-    VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT,
-                             VecVT.getVectorElementCount());
+  if (!EltVT.isByteSized()) {
+    EltVT = EltVT.changeTypeToInteger().getRoundIntegerType(*DAG.getContext());
+    VecVT = VecVT.changeElementType(EltVT);
     Vec = DAG.getNode(ISD::ANY_EXTEND, dl, VecVT, Vec);
+    SDValue NewExtract =
+        DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT, Vec, Idx);
+    return DAG.getZExtOrTrunc(NewExtract, dl, N->getValueType(0));
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arsenm wrote:

Why isn't this any ext or trunc? 

https://github.com/llvm/llvm-project/pull/93357