[llvm] [RISCV] custom scmp(x, 0) and scmp(0, x) lowering for RVV (PR #151753)

[Olaf Bernstein via llvm-commits]

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@@ -8223,6 +8225,40 @@ SDValue RISCVTargetLowering::LowerOperation(SDValue Op,
   case ISD::SADDSAT:
   case ISD::SSUBSAT:
     return lowerToScalableOp(Op, DAG);
+  case ISD::SCMP: {
+    SDLoc DL(Op);
+    EVT VT = Op->getValueType(0);
+    EVT CCVT = getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT);
+
+    SDValue LHS = DAG.getFreeze(Op->getOperand(0));
+    SDValue RHS = DAG.getFreeze(Op->getOperand(1));
+    unsigned SEW = VT.getScalarSizeInBits();
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camel-cdr wrote:

This is about the `DAG.getFreeze()` right? I moved those into the corresponding branch.

https://github.com/llvm/llvm-project/pull/151753