[llvm] [IR][REVEC] Define llvm.vector.broadcast intrinsic (PR #208212)

[Gaëtan Bossu via llvm-commits]

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@@ -17807,6 +17792,28 @@ SDValue AArch64TargetLowering::LowerEXTRACT_SUBVECTOR(SDValue Op,
   return SDValue();
 }
 
+SDValue AArch64TargetLowering::LowerVECTOR_REPEAT(SDValue Op,
+                                                  SelectionDAG &DAG) const {
+  SDLoc DL(Op);
+  EVT VT = Op.getValueType();
+  assert(isUnpackedType(VT, DAG) && "Expected an unpacked vector type!");
+
+  // Broadcast into a packed container before extracting the low lanes, which
+  // places the result elements at the spacing required by the unpacked type.
+  EVT PackedVT = getPackedSVEVectorVT(VT.getVectorElementType());
+  SDValue Src = Op.getOperand(0);
+  EVT SrcVT = Src.getValueType();
+  unsigned NumConcat =
+      PackedVT.getVectorMinNumElements() / SrcVT.getVectorMinNumElements();
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gbossu wrote:

Correct, this is a remnant from the previous VECTOR_BROADCAST node. Sorry about that.

https://github.com/llvm/llvm-project/pull/208212