[llvm] [CodeGen] Expand unsupported interleave to shuffles (PR #210494)

[Kamlesh Kumar via llvm-commits]

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@@ -15277,6 +15287,15 @@ SDValue RISCVTargetLowering::lowerVECTOR_INTERLEAVE(SDValue Op,
   if (VecVT.getScalarSizeInBits() < Subtarget.getELen()) {
     Interleaved = getWideningInterleave(Op.getOperand(0), Op.getOperand(1), DL,
                                         DAG, Subtarget);
+  } else if (Factor == 2 && VecVT.isFixedLengthVector()) {
+    unsigned NumElts = VecVT.getVectorNumElements();
+    SmallVector<int, 8> ShuffleMask = createInterleaveMask(NumElts, Factor);
+    SmallVector<SDValue, 2> Results;
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kamleshbhalui wrote:

yes

https://github.com/llvm/llvm-project/pull/210494