Make F31 and D15 non-reserved registers.

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

diff --git a/lib/Target/Mips/MipsRegisterInfo.cpp b/lib/Target/Mips/MipsRegisterInfo.cpp
index c8598ec8ef9072ab3b56668adfc5bb6387707d67..bb06da9ac01984799da81cfb496dae709db1d777 100644 (file)
--- a/lib/Target/Mips/MipsRegisterInfo.cpp
+++ b/lib/Target/Mips/MipsRegisterInfo.cpp
@@ -24,7 +24,6 @@
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/CodeGen/MachineLocation.h"
 #include "llvm/Target/TargetFrameLowering.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
@@ -35,13 +34,16 @@
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/Analysis/DebugInfo.h"
+
+#define GET_REGINFO_TARGET_DESC
+#include "MipsGenRegisterInfo.inc"
 
 using namespace llvm;
 
 MipsRegisterInfo::MipsRegisterInfo(const MipsSubtarget &ST,
                                    const TargetInstrInfo &tii)
-  : MipsGenRegisterInfo(Mips::ADJCALLSTACKDOWN, Mips::ADJCALLSTACKUP),
-    Subtarget(ST), TII(tii) {}
+  : MipsGenRegisterInfo(Mips::RA), Subtarget(ST), TII(tii) {}
 
 /// getRegisterNumbering - Given the enum value for some register, e.g.
 /// Mips::RA, return the number that it corresponds to (e.g. 31).
@@ -128,11 +130,6 @@ getReservedRegs(const MachineFunction &MF) const {
   Reserved.set(Mips::FP);
   Reserved.set(Mips::RA);
 
-  // SRV4 requires that odd register can't be used.
-  if (!Subtarget.isSingleFloat() && !Subtarget.isMips32())
-    for (unsigned FReg=(Mips::F0)+1; FReg < Mips::F30; FReg+=2)
-      Reserved.set(FReg);
-
   return Reserved;
 }
 
@@ -174,28 +171,6 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
                << "spOffset   : " << spOffset << "\n"
                << "stackSize  : " << stackSize << "\n");
 
-  int Offset;
-
-  // Calculate final offset.
-  // - There is no need to change the offset if the frame object is an outgoing
-  //   argument or a $gp restore location,
-  // - If the frame object is any of the following, its offset must be adjusted
-  //   by adding the size of the stack:
-  //   incoming argument, callee-saved register location or local variable.  
-  if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isGPFI(FrameIndex))
-    Offset = spOffset;
-  else
-    Offset = spOffset + stackSize;
-
-  Offset    += MI.getOperand(i-1).getImm();
-
-  DEBUG(errs() << "Offset     : " << Offset << "\n" << "<--------->\n");
-
-  unsigned NewReg = 0;
-  int NewImm = 0;
-  MachineBasicBlock &MBB = *MI.getParent();
-  bool ATUsed;
-  unsigned FrameReg;
   const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
   int MinCSFI = 0;
   int MaxCSFI = -1;
@@ -211,47 +186,54 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
   //  3. Locations for callee-saved registers.
   // Everything else is referenced relative to whatever register 
   // getFrameRegister() returns.
-  if (MipsFI->isOutArgFI(FrameIndex) ||
+  unsigned FrameReg;
+
+  if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isDynAllocFI(FrameIndex) ||
       (FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI))
     FrameReg = Mips::SP;
   else
     FrameReg = getFrameRegister(MF); 
   
-  // Offset fits in the 16-bit field
-  if (Offset < 0x8000 && Offset >= -0x8000) {
-    NewReg = FrameReg;
-    NewImm = Offset;
-    ATUsed = false;
-  }
-  else {
-    const TargetInstrInfo *TII = MF.getTarget().getInstrInfo();
+  // Calculate final offset.
+  // - There is no need to change the offset if the frame object is one of the
+  //   following: an outgoing argument, pointer to a dynamically allocated
+  //   stack space or a $gp restore location,
+  // - If the frame object is any of the following, its offset must be adjusted
+  //   by adding the size of the stack:
+  //   incoming argument, callee-saved register location or local variable.  
+  int Offset;
+
+  if (MipsFI->isOutArgFI(FrameIndex) || MipsFI->isGPFI(FrameIndex) ||
+      MipsFI->isDynAllocFI(FrameIndex))
+    Offset = spOffset;
+  else
+    Offset = spOffset + stackSize;
+
+  Offset    += MI.getOperand(i+1).getImm();
+
+  DEBUG(errs() << "Offset     : " << Offset << "\n" << "<--------->\n");
+
+  // If MI is not a debug value, make sure Offset fits in the 16-bit immediate
+  // field. 
+  if (!MI.isDebugValue() && (Offset >= 0x8000 || Offset < -0x8000)) {
+    MachineBasicBlock &MBB = *MI.getParent();
     DebugLoc DL = II->getDebugLoc();
-    int ImmLo = (short)(Offset & 0xffff);
     int ImmHi = (((unsigned)Offset & 0xffff0000) >> 16) +
                 ((Offset & 0x8000) != 0);
 
     // FIXME: change this when mips goes MC".
-    BuildMI(MBB, II, DL, TII->get(Mips::NOAT));
-    BuildMI(MBB, II, DL, TII->get(Mips::LUi), Mips::AT).addImm(ImmHi);
-    BuildMI(MBB, II, DL, TII->get(Mips::ADDu), Mips::AT).addReg(FrameReg)
-                                                        .addReg(Mips::AT);
-    NewReg = Mips::AT;
-    NewImm = ImmLo;
-    
-    ATUsed = true;
-  }
+    BuildMI(MBB, II, DL, TII.get(Mips::NOAT));
+    BuildMI(MBB, II, DL, TII.get(Mips::LUi), Mips::AT).addImm(ImmHi);
+    BuildMI(MBB, II, DL, TII.get(Mips::ADDu), Mips::AT).addReg(FrameReg)
+                                                       .addReg(Mips::AT);
+    FrameReg = Mips::AT;
+    Offset = (short)(Offset & 0xffff);
 
-  // FIXME: change this when mips goes MC".
-  if (ATUsed)
     BuildMI(MBB, ++II, MI.getDebugLoc(), TII.get(Mips::ATMACRO));
+  }
 
-  MI.getOperand(i).ChangeToRegister(NewReg, false);
-  MI.getOperand(i-1).ChangeToImmediate(NewImm);
-}
-
-unsigned MipsRegisterInfo::
-getRARegister() const {
-  return Mips::RA;
+  MI.getOperand(i).ChangeToRegister(FrameReg, false);
+  MI.getOperand(i+1).ChangeToImmediate(Offset);
 }
 
 unsigned MipsRegisterInfo::
@@ -272,10 +254,3 @@ getEHHandlerRegister() const {
   llvm_unreachable("What is the exception handler register");
   return 0;
 }
-
-int MipsRegisterInfo::
-getDwarfRegNum(unsigned RegNum, bool isEH) const {
-  return MipsGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
-}
-
-#include "MipsGenRegisterInfo.inc"