X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FMSP430%2FMSP430ISelLowering.h;h=01c5071622a7ac11361402d2f847b06c3e469ecf;hb=6a45d681e53a99b4c4f63e0b1664626a596a8151;hp=4921500d392eb7e8295b6970186f7d48f8f37a1d;hpb=2625de35eda2aec28bdec3370a81f533f9721736;p=oota-llvm.git

diff --git a/lib/Target/MSP430/MSP430ISelLowering.h b/lib/Target/MSP430/MSP430ISelLowering.h
index 4921500d392..01c5071622a 100644
--- a/lib/Target/MSP430/MSP430ISelLowering.h
+++ b/lib/Target/MSP430/MSP430ISelLowering.h
@@ -74,7 +74,7 @@ namespace llvm {
     explicit MSP430TargetLowering(MSP430TargetMachine &TM);
 
     /// LowerOperation - Provide custom lowering hooks for some operations.
-    virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
+    virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
 
     /// getTargetNodeName - This method returns the name of a target specific
     /// DAG node.
@@ -83,28 +83,44 @@ namespace llvm {
     /// getFunctionAlignment - Return the Log2 alignment of this function.
     virtual unsigned getFunctionAlignment(const Function *F) const;
 
-    SDValue LowerShifts(SDValue Op, SelectionDAG &DAG);
-    SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
-    SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG);
-    SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
-    SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG);
-    SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
-    SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG);
-    SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG);
-    SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG);
-    SDValue getReturnAddressFrameIndex(SelectionDAG &DAG);
+    SDValue LowerShifts(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const;
+    SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
+    SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
 
     TargetLowering::ConstraintType
     getConstraintType(const std::string &Constraint) const;
     std::pair<unsigned, const TargetRegisterClass*>
     getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const;
 
+    /// isTruncateFree - Return true if it's free to truncate a value of type
+    /// Ty1 to type Ty2. e.g. On msp430 it's free to truncate a i16 value in
+    /// register R15W to i8 by referencing its sub-register R15B.
+    virtual bool isTruncateFree(const Type *Ty1, const Type *Ty2) const;
+    virtual bool isTruncateFree(EVT VT1, EVT VT2) const;
+
+    /// isZExtFree - Return true if any actual instruction that defines a value
+    /// of type Ty1 implicit zero-extends the value to Ty2 in the result
+    /// register. This does not necessarily include registers defined in unknown
+    /// ways, such as incoming arguments, or copies from unknown virtual
+    /// registers. Also, if isTruncateFree(Ty2, Ty1) is true, this does not
+    /// necessarily apply to truncate instructions. e.g. on msp430, all
+    /// instructions that define 8-bit values implicit zero-extend the result
+    /// out to 16 bits.
+    virtual bool isZExtFree(const Type *Ty1, const Type *Ty2) const;
+    virtual bool isZExtFree(EVT VT1, EVT VT2) const;
+
     MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
-                                                   MachineBasicBlock *BB,
-                    DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
+                                                   MachineBasicBlock *BB) const;
     MachineBasicBlock* EmitShiftInstr(MachineInstr *MI,
-                                      MachineBasicBlock *BB,
-                    DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
+                                      MachineBasicBlock *BB) const;
 
   private:
     SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
@@ -113,7 +129,7 @@ namespace llvm {
                            const SmallVectorImpl<ISD::OutputArg> &Outs,
                            const SmallVectorImpl<ISD::InputArg> &Ins,
                            DebugLoc dl, SelectionDAG &DAG,
-                           SmallVectorImpl<SDValue> &InVals);
+                           SmallVectorImpl<SDValue> &InVals) const;
 
     SDValue LowerCCCArguments(SDValue Chain,
                               CallingConv::ID CallConv,
@@ -121,33 +137,33 @@ namespace llvm {
                               const SmallVectorImpl<ISD::InputArg> &Ins,
                               DebugLoc dl,
                               SelectionDAG &DAG,
-                              SmallVectorImpl<SDValue> &InVals);
+                              SmallVectorImpl<SDValue> &InVals) const;
 
     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
                             CallingConv::ID CallConv, bool isVarArg,
                             const SmallVectorImpl<ISD::InputArg> &Ins,
                             DebugLoc dl, SelectionDAG &DAG,
-                            SmallVectorImpl<SDValue> &InVals);
+                            SmallVectorImpl<SDValue> &InVals) const;
 
     virtual SDValue
       LowerFormalArguments(SDValue Chain,
                            CallingConv::ID CallConv, bool isVarArg,
                            const SmallVectorImpl<ISD::InputArg> &Ins,
                            DebugLoc dl, SelectionDAG &DAG,
-                           SmallVectorImpl<SDValue> &InVals);
+                           SmallVectorImpl<SDValue> &InVals) const;
     virtual SDValue
       LowerCall(SDValue Chain, SDValue Callee,
-                CallingConv::ID CallConv, bool isVarArg, bool isTailCall,
+                CallingConv::ID CallConv, bool isVarArg, bool &isTailCall,
                 const SmallVectorImpl<ISD::OutputArg> &Outs,
                 const SmallVectorImpl<ISD::InputArg> &Ins,
                 DebugLoc dl, SelectionDAG &DAG,
-                SmallVectorImpl<SDValue> &InVals);
+                SmallVectorImpl<SDValue> &InVals) const;
 
     virtual SDValue
       LowerReturn(SDValue Chain,
                   CallingConv::ID CallConv, bool isVarArg,
                   const SmallVectorImpl<ISD::OutputArg> &Outs,
-                  DebugLoc dl, SelectionDAG &DAG);
+                  DebugLoc dl, SelectionDAG &DAG) const;
 
     virtual bool getPostIndexedAddressParts(SDNode *N, SDNode *Op,
                                             SDValue &Base,