I had the same issue as both of you when I was implementing this for my
backend. In LowerCall you can get the callee prototype info when the Callee
SDValue is a GlobalAddressSDNode doing cast<Function>(G->getGlobal())
(where G is GlobalAddressSDNode *G =
dyn_cast<GlobalAddressSDNode>(Callee)),
but this won't work when it is a ExternalSymbolSDNode, for that case i had
to add additional info into the ISD::OutputArg struct to know the real size
of the splitted argument.
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