[llvm] [RISCV] Support the large code model. (PR #70308)

[Craig Topper via llvm-commits]

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@@ -7300,6 +7301,38 @@ static SDValue getTargetNode(JumpTableSDNode *N, const SDLoc &DL, EVT Ty,
   return DAG.getTargetJumpTable(N->getIndex(), Ty, Flags);
 }
 
+static SDValue getLargeGlobalAddress(GlobalAddressSDNode *N, SDLoc DL, EVT Ty,
+                                     SelectionDAG &DAG) {
+  RISCVConstantPoolValue *CPV = RISCVConstantPoolValue::Create(N->getGlobal());
+  SDValue CPAddr = DAG.getTargetConstantPool(CPV, Ty, Align(8));
+  SDValue LC = DAG.getNode(RISCVISD::LLA, DL, Ty, CPAddr);
+  return DAG.getLoad(
+      Ty, DL, DAG.getEntryNode(), LC,
+      MachinePointerInfo::getConstantPool(DAG.getMachineFunction()));
+}
+
+static SDValue getLargeExternalSymbol(ExternalSymbolSDNode *N, SDLoc DL, EVT Ty,
+                                      SelectionDAG &DAG) {
+  RISCVConstantPoolValue *CPV =
+      RISCVConstantPoolValue::Create(*DAG.getContext(), N->getSymbol());
+  SDValue CPAddr = DAG.getTargetConstantPool(CPV, Ty, Align(8));
+  SDValue LC = DAG.getNode(RISCVISD::LLA, DL, Ty, CPAddr);
+  return DAG.getLoad(
+      Ty, DL, DAG.getEntryNode(), LC,
+      MachinePointerInfo::getConstantPool(DAG.getMachineFunction()));
+}
+
+template <class NodeTy>
+static SDValue getLargeAddr(NodeTy *N, SDLoc DL, EVT Ty, SelectionDAG &DAG) {
+  if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(N)) {
+    return getLargeGlobalAddress(G, DL, Ty, DAG);
+  } else {
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topperc wrote:

No `else` after `return`

https://github.com/llvm/llvm-project/pull/70308