[Sparc] Add support for leaf functions in sparc backend.

llvm-svn: 182822

1 files changed, 5 insertions, 3 deletions

diff --git a/llvm/lib/Target/Sparc/SparcRegisterInfo.cpp b/llvm/lib/Target/Sparc/SparcRegisterInfo.cpp
index a5297dcae70..e860cbbaf41 100644
--- a/llvm/lib/Target/Sparc/SparcRegisterInfo.cpp
+++ b/llvm/lib/Target/Sparc/SparcRegisterInfo.cpp
@@ -13,6 +13,7 @@
 
 #include "SparcRegisterInfo.h"
 #include "Sparc.h"
+#include "SparcMachineFunctionInfo.h"
 #include "SparcSubtarget.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
@@ -89,12 +90,13 @@ SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
   int64_t Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
                    MI.getOperand(FIOperandNum + 1).getImm() +
                    Subtarget.getStackPointerBias();
-
+  SparcMachineFunctionInfo *FuncInfo = MF.getInfo<SparcMachineFunctionInfo>();
+  unsigned FramePtr = (FuncInfo->isLeafProc()) ? SP::O6 : SP::I6;
   // Replace frame index with a frame pointer reference.
   if (Offset >= -4096 && Offset <= 4095) {
     // If the offset is small enough to fit in the immediate field, directly
     // encode it.
-    MI.getOperand(FIOperandNum).ChangeToRegister(SP::I6, false);
+    MI.getOperand(FIOperandNum).ChangeToRegister(FramePtr, false);
     MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
   } else {
     // Otherwise, emit a G1 = SETHI %hi(offset).  FIXME: it would be better to 
@@ -103,7 +105,7 @@ SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
     BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi);
     // Emit G1 = G1 + I6
     BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1)
-      .addReg(SP::I6);
+      .addReg(FramePtr);
     // Insert: G1+%lo(offset) into the user.
     MI.getOperand(FIOperandNum).ChangeToRegister(SP::G1, false);
     MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset & ((1 << 10)-1));