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

[Gaëtan Bossu via llvm-commits]

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@@ -8058,6 +8085,30 @@ SDValue DAGTypeLegalizer::WidenVecOp_CONCAT_VECTORS(SDNode *N) {
   return DAG.getBuildVector(VT, dl, Ops);
 }
 
+SDValue DAGTypeLegalizer::WidenVecOp_VECTOR_REPEAT(SDNode *N) {
+  SDLoc DL(N);
+  EVT VT = N->getValueType(0);
+  SDValue Src = N->getOperand(0);
+  EVT SrcVT = Src.getValueType();
+  EVT WidennedSrcVT = TLI.getTypeToTransformTo(*DAG.getContext(), SrcVT);
+  assert(WidennedSrcVT.getVectorElementCount().isKnownMultipleOf(
+             SrcVT.getVectorElementCount()) &&
+         "Cannot widen VECTOR_REPEAT operand to an ElementCount that's not "
+         "a multiple of the input ElementCount.");
+  unsigned NumConcat =
+      WidennedSrcVT.getVectorMinNumElements() / SrcVT.getVectorMinNumElements();
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gbossu wrote:

Changed and turned the assert into a `report_fatal_error`.

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