[LLVMdev] legalization of truncating stores in LegalizeDAG.cpp

[Hatanaka, Akira]

In LegalizeDAG.cpp, truncating stores are custom-lowered in line 1314-1317:


1314         case TargetLowering::Custom:
1315           ReplaceNode(SDValue(Node, 0),
1316                       TLI.LowerOperation(SDValue(Node, 0), DAG));
1317           break;


Is there a reason it doesn't check whether the SDValue returned from
TargetLowering::LowerOperation is null before it replaces the original node with the returned node? The return value is checked everywhere else TLI.LowerOperation is called (line 937, for example).

937         Tmp1 = TLI.LowerOperation(Tmp3, DAG);
938         if (Tmp1.getNode()) {
939           Tmp3 = Tmp1;
940           Tmp4 = Tmp1.getValue(1);
941         }
942         break;

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