+// An EH_RETURN is the result of lowering llvm.eh.return which in turn is
+// generated from __builtin_eh_return (offset, handler)
+// The effect of this is to adjust the stack pointer by "offset"
+// and then branch to "handler".
+SDValue MipsTargetLowering::LowerEH_RETURN(SDValue Op, SelectionDAG &DAG)
+ const {
+ MachineFunction &MF = DAG.getMachineFunction();
+ MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
+
+ MipsFI->setCallsEhReturn();
+ SDValue Chain = Op.getOperand(0);
+ SDValue Offset = Op.getOperand(1);
+ SDValue Handler = Op.getOperand(2);
+ DebugLoc DL = Op.getDebugLoc();
+ EVT Ty = IsN64 ? MVT::i64 : MVT::i32;
+
+ // Store stack offset in V1, store jump target in V0. Glue CopyToReg and
+ // EH_RETURN nodes, so that instructions are emitted back-to-back.
+ unsigned OffsetReg = IsN64 ? Mips::V1_64 : Mips::V1;
+ unsigned AddrReg = IsN64 ? Mips::V0_64 : Mips::V0;
+ Chain = DAG.getCopyToReg(Chain, DL, OffsetReg, Offset, SDValue());
+ Chain = DAG.getCopyToReg(Chain, DL, AddrReg, Handler, Chain.getValue(1));
+ return DAG.getNode(MipsISD::EH_RETURN, DL, MVT::Other, Chain,
+ DAG.getRegister(OffsetReg, Ty),
+ DAG.getRegister(AddrReg, getPointerTy()),
+ Chain.getValue(1));
+}
+