[mips] Custom-lower ISD::FRAME_TO_ARGS_OFFSET node.
Patch by Sasa Stankovic.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167548 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index 239140c..e225b6c 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -247,6 +247,10 @@
setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
}
+ setOperationAction(ISD::ADD, MVT::i32, Custom);
+ if (HasMips64)
+ setOperationAction(ISD::ADD, MVT::i64, Custom);
+
setOperationAction(ISD::SDIV, MVT::i32, Expand);
setOperationAction(ISD::SREM, MVT::i32, Expand);
setOperationAction(ISD::UDIV, MVT::i32, Expand);
@@ -914,6 +918,7 @@
case ISD::STORE: return LowerSTORE(Op, DAG);
case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
case ISD::INTRINSIC_W_CHAIN: return LowerINTRINSIC_W_CHAIN(Op, DAG);
+ case ISD::ADD: return LowerADD(Op, DAG);
}
return SDValue();
}
@@ -2541,6 +2546,27 @@
}
}
+SDValue MipsTargetLowering::LowerADD(SDValue Op, SelectionDAG &DAG) const {
+ if (Op->getOperand(0).getOpcode() != ISD::FRAMEADDR
+ || cast<ConstantSDNode>
+ (Op->getOperand(0).getOperand(0))->getZExtValue() != 0
+ || Op->getOperand(1).getOpcode() != ISD::FRAME_TO_ARGS_OFFSET)
+ return SDValue();
+
+ // The pattern
+ // (add (frameaddr 0), (frame_to_args_offset))
+ // results from lowering llvm.eh.dwarf.cfa intrinsic. Transform it to
+ // (add FrameObject, 0)
+ // where FrameObject is a fixed StackObject with offset 0 which points to
+ // the old stack pointer.
+ MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
+ EVT ValTy = Op->getValueType(0);
+ int FI = MFI->CreateFixedObject(Op.getValueSizeInBits() / 8, 0, false);
+ SDValue InArgsAddr = DAG.getFrameIndex(FI, ValTy);
+ return DAG.getNode(ISD::ADD, Op->getDebugLoc(), ValTy, InArgsAddr,
+ DAG.getConstant(0, ValTy));
+}
+
//===----------------------------------------------------------------------===//
// Calling Convention Implementation
//===----------------------------------------------------------------------===//