[SystemZ][NFC] Use new getPointerSize function (llvm#89623)

Use the new getPointerSize() function throughout the frame lowering class.

Author: redstar

llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp

@@ -181,7 +181,8 @@ bool SystemZELFFrameLowering::assignCalleeSavedSpillSlots(
         StartSPOffset = Offset;
       }
       Offset -= SystemZMC::ELFCallFrameSize;
-      int FrameIdx = MFFrame.CreateFixedSpillStackObject(8, Offset);
+      int FrameIdx =
+          MFFrame.CreateFixedSpillStackObject(getPointerSize(), Offset);
       CS.setFrameIdx(FrameIdx);
     } else
       CS.setFrameIdx(INT32_MAX);
@@ -456,8 +457,10 @@ void SystemZELFFrameLowering::processFunctionBeforeFrameFinalized(
     // are outside the reach of an unsigned 12-bit displacement.
     // Create 2 for the case where both addresses in an MVC are
     // out of range.
-    RS->addScavengingFrameIndex(MFFrame.CreateStackObject(8, Align(8), false));
-    RS->addScavengingFrameIndex(MFFrame.CreateStackObject(8, Align(8), false));
+    RS->addScavengingFrameIndex(
+        MFFrame.CreateStackObject(getPointerSize(), Align(8), false));
+    RS->addScavengingFrameIndex(
+        MFFrame.CreateStackObject(getPointerSize(), Align(8), false));
   }
 
   // If R6 is used as an argument register it is still callee saved. If it in
@@ -870,7 +873,7 @@ int SystemZELFFrameLowering::getOrCreateFramePointerSaveIndex(
   if (!FI) {
     MachineFrameInfo &MFFrame = MF.getFrameInfo();
     int Offset = getBackchainOffset(MF) - SystemZMC::ELFCallFrameSize;
-    FI = MFFrame.CreateFixedObject(8, Offset, false);
+    FI = MFFrame.CreateFixedObject(getPointerSize(), Offset, false);
     ZFI->setFramePointerSaveIndex(FI);
   }
   return FI;
@@ -906,7 +909,7 @@ int SystemZXPLINKFrameLowering::getOrCreateFramePointerSaveIndex(
   int FI = ZFI->getFramePointerSaveIndex();
   if (!FI) {
     MachineFrameInfo &MFFrame = MF.getFrameInfo();
-    FI = MFFrame.CreateFixedObject(8, 0, false);
+    FI = MFFrame.CreateFixedObject(getPointerSize(), 0, false);
     MFFrame.setStackID(FI, TargetStackID::NoAlloc);
     ZFI->setFramePointerSaveIndex(FI);
   }
@@ -1032,7 +1035,7 @@ bool SystemZXPLINKFrameLowering::assignCalleeSavedSpillSlots(
         // Non-volatile GPRs are saved in the dedicated register save area at
         // the bottom of the stack and are not truly part of the "normal" stack
         // frame. Mark the frame index as NoAlloc to indicate it as such.
-        unsigned RegSize = 8;
+        unsigned RegSize = getPointerSize();
         int FrameIdx =
             (FPSI && Offset == 0)
                 ? FPSI
@@ -1302,7 +1305,7 @@ void SystemZXPLINKFrameLowering::emitPrologue(MachineFunction &MF,
     for (unsigned I = FixedRegs; I < SystemZ::XPLINK64NumArgGPRs; I++) {
       uint64_t StartOffset = MFFrame.getOffsetAdjustment() +
                              MFFrame.getStackSize() + Regs.getCallFrameSize() +
-                             getOffsetOfLocalArea() + I * 8;
+                             getOffsetOfLocalArea() + I * getPointerSize();
       unsigned Reg = GPRs[I];
       BuildMI(MBB, MBBI, DL, TII->get(SystemZ::STG))
           .addReg(Reg)