[llvm] ISel: introduce vector ISD::LRINT, ISD::LLRINT; custom RISCV lowering (PR #66924)

[Craig Topper via llvm-commits]

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@@ -2945,6 +2945,34 @@ lowerFTRUNC_FCEIL_FFLOOR_FROUND(SDValue Op, SelectionDAG &DAG,
                      DAG.getTargetConstant(FRM, DL, Subtarget.getXLenVT()));
 }
 
+// Expand vector LRINT and LLRINT by converting to the integer domain.
+static SDValue lowerVectorXRINT(SDValue Op, SelectionDAG &DAG,
+                                const RISCVSubtarget &Subtarget) {
+  MVT VT = Op.getSimpleValueType();
+  assert(VT.isVector() && "Unexpected type");
+
+  SDLoc DL(Op);
+  SDValue Src = Op.getOperand(0);
+  MVT ContainerVT = VT;
+
+  if (VT.isFixedLengthVector()) {
+    ContainerVT = getContainerForFixedLengthVector(DAG, VT, Subtarget);
+    Src = convertToScalableVector(ContainerVT, Src, DAG, Subtarget);
+  }
+
+  // Freeze the source since we are increasing the number of uses.
+  Src = DAG.getFreeze(Src);
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topperc wrote:

We don't need a freeze here

https://github.com/llvm/llvm-project/pull/66924