DAG: Handle vector legalization of minimumnum/maximumnum (#109779)

Follow the same patterns as the other min/max variants.

Author: arsenm

llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp

@@ -4537,6 +4537,8 @@ void DAGTypeLegalizer::WidenVectorResult(SDNode *N, unsigned ResNo) {
   case ISD::VP_FMINIMUM:
   case ISD::FMAXIMUM:
   case ISD::VP_FMAXIMUM:
+  case ISD::FMINIMUMNUM:
+  case ISD::FMAXIMUMNUM:
   case ISD::SMIN: case ISD::VP_SMIN:
   case ISD::SMAX: case ISD::VP_SMAX:
   case ISD::UMIN: case ISD::VP_UMIN:

llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

@@ -8606,6 +8606,9 @@ SDValue TargetLowering::expandFMINIMUMNUM_FMAXIMUMNUM(SDNode *Node,
       return DAG.getNode(IEEE2008Op, DL, VT, LHS, RHS, Flags);
   }
 
+  if (VT.isVector() && !isOperationLegalOrCustom(ISD::VSELECT, VT))
+    return DAG.UnrollVectorOp(Node);
+
   // If only one operand is NaN, override it with another operand.
   if (!Flags.hasNoNaNs() && !DAG.isKnownNeverNaN(LHS)) {
     LHS = DAG.getSelectCC(DL, LHS, LHS, RHS, LHS, ISD::SETUO);

llvm/lib/Target/AMDGPU/SIISelLowering.cpp

@@ -753,7 +753,8 @@ SITargetLowering::SITargetLowering(const TargetMachine &TM,
     setOperationAction({ISD::FMAXNUM, ISD::FMINNUM}, MVT::f16, Custom);
     setOperationAction({ISD::FMAXNUM_IEEE, ISD::FMINNUM_IEEE}, MVT::f16, Legal);
 
-    setOperationAction({ISD::FMINNUM_IEEE, ISD::FMAXNUM_IEEE},
+    setOperationAction({ISD::FMINNUM_IEEE, ISD::FMAXNUM_IEEE, ISD::FMINIMUMNUM,
+                        ISD::FMAXIMUMNUM},
                        {MVT::v4f16, MVT::v8f16, MVT::v16f16, MVT::v32f16},
                        Custom);
 
@@ -5842,6 +5843,8 @@ SDValue SITargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
   case ISD::FMAXNUM_IEEE:
   case ISD::FMINIMUM:
   case ISD::FMAXIMUM:
+  case ISD::FMINIMUMNUM:
+  case ISD::FMAXIMUMNUM:
   case ISD::UADDSAT:
   case ISD::USUBSAT:
   case ISD::SADDSAT: