Make sure we don't get a warning from this variable that is only used

[oota-llvm.git] / lib / Target / Mips / Mips16RegisterInfo.cpp

diff --git a/lib/Target/Mips/Mips16RegisterInfo.cpp b/lib/Target/Mips/Mips16RegisterInfo.cpp
index 47a41d6fa846783499d1c74379281b3f71e0053a..9d0f2c927e4daa630cc7511ce584bf2d2d39c33b 100644 (file)
--- a/lib/Target/Mips/Mips16RegisterInfo.cpp
+++ b/lib/Target/Mips/Mips16RegisterInfo.cpp
@@ -1,4 +1,4 @@
-//===-- Mips16RegisterInfo.cpp - MIPS16 Register Information -== ----------===//
+//===-- Mips16RegisterInfo.cpp - MIPS16 Register Information --------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -12,42 +12,69 @@
 //===----------------------------------------------------------------------===//
 
 #include "Mips16RegisterInfo.h"
+#include "Mips16InstrInfo.h"
 #include "Mips.h"
+#include "Mips16InstrInfo.h"
 #include "MipsAnalyzeImmediate.h"
 #include "MipsInstrInfo.h"
-#include "MipsSubtarget.h"
 #include "MipsMachineFunction.h"
-#include "llvm/Constants.h"
-#include "llvm/DebugInfo.h"
-#include "llvm/Type.h"
-#include "llvm/Function.h"
-#include "llvm/CodeGen/ValueTypes.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/MachineFunction.h"
+#include "MipsSubtarget.h"
+#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/DebugInfo.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Type.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/STLExtras.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
 
 using namespace llvm;
 
 Mips16RegisterInfo::Mips16RegisterInfo(const MipsSubtarget &ST)
   : MipsRegisterInfo(ST) {}
 
-// This function eliminate ADJCALLSTACKDOWN,
-// ADJCALLSTACKUP pseudo instructions
-void Mips16RegisterInfo::
-eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
-                              MachineBasicBlock::iterator I) const {
-  // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
-  MBB.erase(I);
+bool Mips16RegisterInfo::requiresRegisterScavenging
+  (const MachineFunction &MF) const {
+  return false;
+}
+bool Mips16RegisterInfo::requiresFrameIndexScavenging
+  (const MachineFunction &MF) const {
+  return false;
+}
+
+bool Mips16RegisterInfo::useFPForScavengingIndex
+  (const MachineFunction &MF) const {
+  return false;
+}
+
+bool Mips16RegisterInfo::saveScavengerRegister
+  (MachineBasicBlock &MBB,
+   MachineBasicBlock::iterator I,
+   MachineBasicBlock::iterator &UseMI,
+   const TargetRegisterClass *RC,
+   unsigned Reg) const {
+  DebugLoc DL;
+  const TargetInstrInfo &TII = *MBB.getParent()->getTarget().getInstrInfo();
+  TII.copyPhysReg(MBB, I, DL, Mips::T0, Reg, true);
+  TII.copyPhysReg(MBB, UseMI, DL, Reg, Mips::T0, true);
+  return true;
+}
+
+const TargetRegisterClass *
+Mips16RegisterInfo::intRegClass(unsigned Size) const {
+  assert(Size == 4);
+  return &Mips::CPU16RegsRegClass;
 }
 
 void Mips16RegisterInfo::eliminateFI(MachineBasicBlock::iterator II,
@@ -100,13 +127,26 @@ void Mips16RegisterInfo::eliminateFI(MachineBasicBlock::iterator II,
   //   by adding the size of the stack:
   //   incoming argument, callee-saved register location or local variable.
   int64_t Offset;
+  bool IsKill = false;
   Offset = SPOffset + (int64_t)StackSize;
   Offset += MI.getOperand(OpNo + 1).getImm();
 
 
   DEBUG(errs() << "Offset     : " << Offset << "\n" << "<--------->\n");
 
-  MI.getOperand(OpNo).ChangeToRegister(FrameReg, false);
+  if (!MI.isDebugValue() &&
+      !Mips16InstrInfo::validImmediate(MI.getOpcode(), FrameReg, Offset)) {
+    MachineBasicBlock &MBB = *MI.getParent();
+    DebugLoc DL = II->getDebugLoc();
+    unsigned NewImm;
+    const Mips16InstrInfo &TII =
+      *static_cast<const Mips16InstrInfo*>(
+        MBB.getParent()->getTarget().getInstrInfo());
+    FrameReg = TII.loadImmediate(FrameReg, Offset, MBB, II, DL, NewImm);
+    Offset = SignExtend64<16>(NewImm);
+    IsKill = true;
+  }
+  MI.getOperand(OpNo).ChangeToRegister(FrameReg, false, false, IsKill);
   MI.getOperand(OpNo + 1).ChangeToImmediate(Offset);