1 files changed, 46 insertions, 41 deletions

diff --git a/lib/CodeGen/PrologEpilogInserter.cpp b/lib/CodeGen/PrologEpilogInserter.cpp
index c74a42f..b98d210 100644
--- a/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/lib/CodeGen/PrologEpilogInserter.cpp
@@ -160,7 +160,7 @@ bool PEI::runOnMachineFunction(MachineFunction &Fn) {
   replaceFrameIndices(Fn);
 
   // If register scavenging is needed, as we've enabled doing it as a
-  // post-pass, scavenge the virtual registers that frame index elimiation
+  // post-pass, scavenge the virtual registers that frame index elimination
   // inserted.
   if (TRI->requiresRegisterScavenging(Fn) && FrameIndexVirtualScavenging)
     scavengeFrameVirtualRegs(Fn);
@@ -268,51 +268,56 @@ void PEI::calculateCalleeSavedRegisters(MachineFunction &F) {
     }
   }
 
-  if (CSI.empty())
-    return;   // Early exit if no callee saved registers are modified!
+  if (!TFI->assignCalleeSavedSpillSlots(F, RegInfo, CSI)) {
+    // If target doesn't implement this, use generic code.
 
-  unsigned NumFixedSpillSlots;
-  const TargetFrameLowering::SpillSlot *FixedSpillSlots =
-    TFI->getCalleeSavedSpillSlots(NumFixedSpillSlots);
+    if (CSI.empty())
+      return; // Early exit if no callee saved registers are modified!
 
-  // Now that we know which registers need to be saved and restored, allocate
-  // stack slots for them.
-  for (std::vector<CalleeSavedInfo>::iterator
-         I = CSI.begin(), E = CSI.end(); I != E; ++I) {
-    unsigned Reg = I->getReg();
-    const TargetRegisterClass *RC = RegInfo->getMinimalPhysRegClass(Reg);
+    unsigned NumFixedSpillSlots;
+    const TargetFrameLowering::SpillSlot *FixedSpillSlots =
+        TFI->getCalleeSavedSpillSlots(NumFixedSpillSlots);
 
-    int FrameIdx;
-    if (RegInfo->hasReservedSpillSlot(F, Reg, FrameIdx)) {
-      I->setFrameIdx(FrameIdx);
-      continue;
-    }
+    // Now that we know which registers need to be saved and restored, allocate
+    // stack slots for them.
+    for (std::vector<CalleeSavedInfo>::iterator I = CSI.begin(), E = CSI.end();
+         I != E; ++I) {
+      unsigned Reg = I->getReg();
+      const TargetRegisterClass *RC = RegInfo->getMinimalPhysRegClass(Reg);
 
-    // Check to see if this physreg must be spilled to a particular stack slot
-    // on this target.
-    const TargetFrameLowering::SpillSlot *FixedSlot = FixedSpillSlots;
-    while (FixedSlot != FixedSpillSlots+NumFixedSpillSlots &&
-           FixedSlot->Reg != Reg)
-      ++FixedSlot;
-
-    if (FixedSlot == FixedSpillSlots + NumFixedSpillSlots) {
-      // Nope, just spill it anywhere convenient.
-      unsigned Align = RC->getAlignment();
-      unsigned StackAlign = TFI->getStackAlignment();
-
-      // We may not be able to satisfy the desired alignment specification of
-      // the TargetRegisterClass if the stack alignment is smaller. Use the
-      // min.
-      Align = std::min(Align, StackAlign);
-      FrameIdx = MFI->CreateStackObject(RC->getSize(), Align, true);
-      if ((unsigned)FrameIdx < MinCSFrameIndex) MinCSFrameIndex = FrameIdx;
-      if ((unsigned)FrameIdx > MaxCSFrameIndex) MaxCSFrameIndex = FrameIdx;
-    } else {
-      // Spill it to the stack where we must.
-      FrameIdx = MFI->CreateFixedObject(RC->getSize(), FixedSlot->Offset, true);
-    }
+      int FrameIdx;
+      if (RegInfo->hasReservedSpillSlot(F, Reg, FrameIdx)) {
+        I->setFrameIdx(FrameIdx);
+        continue;
+      }
+
+      // Check to see if this physreg must be spilled to a particular stack slot
+      // on this target.
+      const TargetFrameLowering::SpillSlot *FixedSlot = FixedSpillSlots;
+      while (FixedSlot != FixedSpillSlots + NumFixedSpillSlots &&
+             FixedSlot->Reg != Reg)
+        ++FixedSlot;
+
+      if (FixedSlot == FixedSpillSlots + NumFixedSpillSlots) {
+        // Nope, just spill it anywhere convenient.
+        unsigned Align = RC->getAlignment();
+        unsigned StackAlign = TFI->getStackAlignment();
+
+        // We may not be able to satisfy the desired alignment specification of
+        // the TargetRegisterClass if the stack alignment is smaller. Use the
+        // min.
+        Align = std::min(Align, StackAlign);
+        FrameIdx = MFI->CreateStackObject(RC->getSize(), Align, true);
+        if ((unsigned)FrameIdx < MinCSFrameIndex) MinCSFrameIndex = FrameIdx;
+        if ((unsigned)FrameIdx > MaxCSFrameIndex) MaxCSFrameIndex = FrameIdx;
+      } else {
+        // Spill it to the stack where we must.
+        FrameIdx =
+            MFI->CreateFixedSpillStackObject(RC->getSize(), FixedSlot->Offset);
+      }
 
-    I->setFrameIdx(FrameIdx);
+      I->setFrameIdx(FrameIdx);
+    }
   }
 
   MFI->setCalleeSavedInfo(CSI);