Convert Alpha and Mips to use a MachineFunctionInfo subclass to

carry GlobalBaseReg, and GlobalRetAddr too in Alpha's case. This
eliminates the need for them to search through the
MachineRegisterInfo livein list in order to identify these
virtual registers. EmitLiveInCopies is now the only user of the
virtual register portion of MachineRegisterInfo's livein data.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72802 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 48 insertions, 0 deletions

diff --git a/lib/Target/Alpha/AlphaMachineFunctionInfo.h b/lib/Target/Alpha/AlphaMachineFunctionInfo.h
new file mode 100644
index 0000000000..47de5dfad9
--- /dev/null
+++ b/lib/Target/Alpha/AlphaMachineFunctionInfo.h
@@ -0,0 +1,48 @@
+//====- AlphaMachineFuctionInfo.h - Alpha machine function info -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares Alpha-specific per-machine-function information.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ALPHAMACHINEFUNCTIONINFO_H
+#define ALPHAMACHINEFUNCTIONINFO_H
+
+#include "llvm/CodeGen/MachineFunction.h"
+
+namespace llvm {
+
+/// AlphaMachineFunctionInfo - This class is derived from MachineFunction
+/// private Alpha target-specific information for each MachineFunction.
+class AlphaMachineFunctionInfo : public MachineFunctionInfo {
+  /// GlobalBaseReg - keeps track of the virtual register initialized for
+  /// use as the global base register. This is used for PIC in some PIC
+  /// relocation models.
+  unsigned GlobalBaseReg;
+
+  /// GlobalRetAddr = keeps track of the virtual register initialized for
+  /// the return address value.
+  unsigned GlobalRetAddr;
+
+public:
+  AlphaMachineFunctionInfo() : GlobalBaseReg(0), GlobalRetAddr(0) {}
+
+  AlphaMachineFunctionInfo(MachineFunction &MF) : GlobalBaseReg(0),
+                                                  GlobalRetAddr(0) {}
+
+  unsigned getGlobalBaseReg() const { return GlobalBaseReg; }
+  void setGlobalBaseReg(unsigned Reg) { GlobalBaseReg = Reg; }
+
+  unsigned getGlobalRetAddr() const { return GlobalRetAddr; }
+  void setGlobalRetAddr(unsigned Reg) { GlobalRetAddr = Reg; }
+};
+
+} // End llvm namespace
+
+#endif