Change the Value argument to eliminateFrameIndex to a type-tagged value. This

is preparatory to having PEI's scavenged frame index value reuse logic
properly distinguish types of frame values (e.g., whether the value is
stack-pointer relative or frame-pointer relative).

No functionality change.

llvm-svn: 98086

4 files changed, 10 insertions, 6 deletions

diff --git a/llvm/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/llvm/lib/Target/ARM/ARMBaseRegisterInfo.cpp
index 8f35c37b9a9..d9b8323f4ae 100644
--- a/llvm/lib/Target/ARM/ARMBaseRegisterInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMBaseRegisterInfo.cpp
@@ -1153,7 +1153,7 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
 
 unsigned
 ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
-                                         int SPAdj, int *Value,
+                                         int SPAdj, FrameIndexValue *Value,
                                          RegScavenger *RS) const {
   unsigned i = 0;
   MachineInstr &MI = *II;
@@ -1205,7 +1205,10 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
     MI.getOperand(i).ChangeToRegister(FrameReg, false, false, false);
   else {
     ScratchReg = MF.getRegInfo().createVirtualRegister(ARM::GPRRegisterClass);
-    if (Value) *Value = Offset;
+    if (Value) {
+      Value->first = FrameReg; // use the frame register as a kind indicator
+      Value->second = Offset;
+    }
     if (!AFI->isThumbFunction())
       emitARMRegPlusImmediate(MBB, II, MI.getDebugLoc(), ScratchReg, FrameReg,
                               Offset, Pred, PredReg, TII);
diff --git a/llvm/lib/Target/ARM/ARMBaseRegisterInfo.h b/llvm/lib/Target/ARM/ARMBaseRegisterInfo.h
index 64f6ff1cb3d..456c39237d4 100644
--- a/llvm/lib/Target/ARM/ARMBaseRegisterInfo.h
+++ b/llvm/lib/Target/ARM/ARMBaseRegisterInfo.h
@@ -145,7 +145,7 @@ public:
                                              MachineBasicBlock::iterator I) const;
 
   virtual unsigned eliminateFrameIndex(MachineBasicBlock::iterator II,
-                                       int SPAdj, int *Value = NULL,
+                                       int SPAdj, FrameIndexValue *Value = NULL,
                                        RegScavenger *RS = NULL) const;
 
   virtual void emitPrologue(MachineFunction &MF) const;
diff --git a/llvm/lib/Target/ARM/Thumb1RegisterInfo.cpp b/llvm/lib/Target/ARM/Thumb1RegisterInfo.cpp
index 7731802de48..a4070bd4e17 100644
--- a/llvm/lib/Target/ARM/Thumb1RegisterInfo.cpp
+++ b/llvm/lib/Target/ARM/Thumb1RegisterInfo.cpp
@@ -429,7 +429,7 @@ Thumb1RegisterInfo::saveScavengerRegister(MachineBasicBlock &MBB,
 
 unsigned
 Thumb1RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
-                                        int SPAdj, int *Value,
+                                        int SPAdj, FrameIndexValue *Value,
                                         RegScavenger *RS) const{
   unsigned VReg = 0;
   unsigned i = 0;
@@ -641,9 +641,10 @@ Thumb1RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
   } else if (Desc.mayStore()) {
       VReg = MF.getRegInfo().createVirtualRegister(ARM::tGPRRegisterClass);
       assert (Value && "Frame index virtual allocated, but Value arg is NULL!");
-      *Value = Offset;
       bool UseRR = false;
       bool TrackVReg = FrameReg == ARM::SP;
+      Value->first = FrameReg; // use the frame register as a kind indicator
+      Value->second = Offset;
 
       if (Opcode == ARM::tSpill) {
         if (FrameReg == ARM::SP)
diff --git a/llvm/lib/Target/ARM/Thumb1RegisterInfo.h b/llvm/lib/Target/ARM/Thumb1RegisterInfo.h
index 37ad3881b21..4eca3673391 100644
--- a/llvm/lib/Target/ARM/Thumb1RegisterInfo.h
+++ b/llvm/lib/Target/ARM/Thumb1RegisterInfo.h
@@ -59,7 +59,7 @@ public:
                              const TargetRegisterClass *RC,
                              unsigned Reg) const;
   unsigned eliminateFrameIndex(MachineBasicBlock::iterator II,
-                               int SPAdj, int *Value = NULL,
+                               int SPAdj, FrameIndexValue *Value = NULL,
                                RegScavenger *RS = NULL) const;
 
   void emitPrologue(MachineFunction &MF) const;