Fix a long-standing wart in the code generator: two-address instruction lowering

[oota-llvm.git] / lib / Target / X86 / X86RegisterInfo.h

diff --git a/lib/Target/X86/X86RegisterInfo.h b/lib/Target/X86/X86RegisterInfo.h
index 998fb398d911fa4e345ee0e34981fdab49da51aa..e86cc28d52c896cd5ca1318d93c34286a43c617c 100644 (file)
--- a/lib/Target/X86/X86RegisterInfo.h
+++ b/lib/Target/X86/X86RegisterInfo.h
@@ -15,15 +15,15 @@
 #define X86REGISTERINFO_H
 
 #include "llvm/Target/MRegisterInfo.h"
-
-class llvm::Type;
-
 #include "X86GenRegisterInfo.h.inc"
 
 namespace llvm {
+  class Type;
+  class TargetInstrInfo;
 
 struct X86RegisterInfo : public X86GenRegisterInfo {
-  X86RegisterInfo();
+  const TargetInstrInfo &TII;
+  X86RegisterInfo(const TargetInstrInfo &tii);
 
   /// Code Generation virtual methods...
   void storeRegToStackSlot(MachineBasicBlock &MBB,
@@ -47,10 +47,18 @@ struct X86RegisterInfo : public X86GenRegisterInfo {
   /// folding and return true, otherwise it should return false.  If it folds
   /// the instruction, it is likely that the MachineInstruction the iterator
   /// references has been changed.
-  virtual MachineInstr* foldMemoryOperand(MachineInstr* MI,
-                                          unsigned OpNum,
-                                          int FrameIndex) const;
+  MachineInstr* foldMemoryOperand(MachineInstr* MI,
+                                  unsigned OpNum,
+                                  int FrameIndex) const;
 
+  /// getCalleeSaveRegs - Return a null-terminated list of all of the
+  /// callee-save registers on this target.
+  const unsigned *getCalleeSaveRegs() const;
+
+  /// getCalleeSaveRegClasses - Return a null-terminated list of the preferred
+  /// register classes to spill each callee-saved register with.  The order and
+  /// length of this list match the getCalleeSaveRegs() list.
+  const TargetRegisterClass* const* getCalleeSaveRegClasses() const;
 
   void eliminateCallFramePseudoInstr(MachineFunction &MF,
                                      MachineBasicBlock &MBB,
@@ -64,9 +72,15 @@ struct X86RegisterInfo : public X86GenRegisterInfo {
   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
 
   // Debug information queries.
+  unsigned getRARegister() const;
   unsigned getFrameRegister(MachineFunction &MF) const;
 };
 
+// getX86SubSuperRegister - X86 utility function. It returns the sub or super
+// register of a specific X86 register.
+// e.g. getX86SubSuperRegister(X86::EAX, MVT::i16) return X86:AX
+unsigned getX86SubSuperRegister(unsigned, MVT::ValueType, bool High=false);
+
 } // End llvm namespace
 
 #endif