Remove the now defunct getCompactUnwindEncoding method from the frame lowering code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135634 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 0 insertions, 126 deletions

diff --git a/include/llvm/Target/TargetFrameLowering.h b/include/llvm/Target/TargetFrameLowering.h
index 352b7aee8c..bec84e5d16 100644
--- a/include/llvm/Target/TargetFrameLowering.h
+++ b/include/llvm/Target/TargetFrameLowering.h
@@ -186,14 +186,6 @@ public:
   ///
   virtual void processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
   }
-
-  /// getCompactUnwindEncoding - Get the compact unwind encoding for the
-  /// function. Return 0 if the compact unwind isn't available.
-  virtual uint32_t getCompactUnwindEncoding(ArrayRef<MCCFIInstruction> Instrs,
-                                            int DataAlignmentFactor,
-                                            bool IsEH) const {
-    return 0;
-  }
 };
 
 } // End llvm namespace
diff --git a/lib/Target/X86/X86FrameLowering.cpp b/lib/Target/X86/X86FrameLowering.cpp
index b97641f0b1..66296823c7 100644
--- a/lib/Target/X86/X86FrameLowering.cpp
+++ b/lib/Target/X86/X86FrameLowering.cpp
@@ -1076,118 +1076,3 @@ static uint32_t permuteEncode(unsigned SavedCount, unsigned Registers[6]) {
 
   return permutationEncoding;
 }
-
-uint32_t X86FrameLowering::
-getCompactUnwindEncoding(ArrayRef<MCCFIInstruction> Instrs,
-                         int DataAlignmentFactor, bool IsEH) const {
-  uint32_t Encoding = 0;
-  int CFAOffset = 0;
-  const TargetRegisterInfo *TRI = TM.getRegisterInfo();
-  unsigned SavedRegs[6] = { 0, 0, 0, 0, 0, 0 };
-  unsigned SavedRegIdx = 0;
-  int FramePointerReg = -1;
-
-  for (ArrayRef<MCCFIInstruction>::const_iterator
-         I = Instrs.begin(), E = Instrs.end(); I != E; ++I) {
-    const MCCFIInstruction &Inst = *I;
-    MCSymbol *Label = Inst.getLabel();
-
-    // Ignore invalid labels.
-    if (Label && !Label->isDefined()) continue;
-
-    unsigned Operation = Inst.getOperation();
-    if (Operation != MCCFIInstruction::Move &&
-        Operation != MCCFIInstruction::RelMove)
-      // FIXME: We can't handle this frame just yet.
-      return 0;
-
-    const MachineLocation &Dst = Inst.getDestination();
-    const MachineLocation &Src = Inst.getSource();
-    const bool IsRelative = (Operation == MCCFIInstruction::RelMove);
-
-    if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
-      if (Src.getReg() != MachineLocation::VirtualFP) {
-        // DW_CFA_def_cfa
-        assert(FramePointerReg == -1 &&"Defining more than one frame pointer?");
-        if (TRI->getLLVMRegNum(Src.getReg(), IsEH) != X86::EBP &&
-            TRI->getLLVMRegNum(Src.getReg(), IsEH) != X86::RBP)
-          // The frame pointer isn't EBP/RBP. Cannot make unwind information
-          // compact.
-          return 0;
-        FramePointerReg = TRI->getCompactUnwindRegNum(Src.getReg(), IsEH);
-      } // else DW_CFA_def_cfa_offset
-
-      if (IsRelative)
-        CFAOffset += Src.getOffset();
-      else
-        CFAOffset -= Src.getOffset();
-
-      continue;
-    }
-
-    if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
-      // DW_CFA_def_cfa_register
-      assert(FramePointerReg == -1 && "Defining more than one frame pointer?");
-
-      if (TRI->getLLVMRegNum(Dst.getReg(), IsEH) != X86::EBP &&
-          TRI->getLLVMRegNum(Dst.getReg(), IsEH) != X86::RBP)
-        // The frame pointer isn't EBP/RBP. Cannot make unwind information
-        // compact.
-        return 0;
-
-      FramePointerReg = TRI->getCompactUnwindRegNum(Dst.getReg(), IsEH);
-      if (SavedRegIdx != 1 || SavedRegs[0] != unsigned(FramePointerReg))
-        return 0;
-
-      SavedRegs[0] = 0;
-      SavedRegIdx = 0;
-      continue;
-    }
-
-    unsigned Reg = Src.getReg();
-    int Offset = Dst.getOffset();
-    if (IsRelative)
-      Offset -= CFAOffset;
-    Offset /= DataAlignmentFactor;
-
-    if (Offset < 0) {
-      // FIXME: Handle?
-      // DW_CFA_offset_extended_sf
-      return 0;
-    } else if (Reg < 64) {
-      // DW_CFA_offset + Reg
-      if (SavedRegIdx >= 6) return 0;
-      int CURegNum = TRI->getCompactUnwindRegNum(Reg, IsEH);
-      if (CURegNum == -1) return 0;
-      SavedRegs[SavedRegIdx++] = CURegNum;
-    } else {
-      // FIXME: Handle?
-      // DW_CFA_offset_extended
-      return 0;
-    }
-  }
-
-  // Bail if there are too many registers to encode.
-  if (SavedRegIdx > 6) return 0;
-
-  // Check if the offset is too big.
-  CFAOffset /= 4;
-  if ((CFAOffset & 0xFF) != CFAOffset)
-    return 0;
-  Encoding |= (CFAOffset & 0xFF) << 16; // Size encoding.
-
-  if (FramePointerReg != -1) {
-    Encoding |= 0x01000000;     // EBP/RBP Unwind Frame
-    for (unsigned I = 0; I != SavedRegIdx; ++I) {
-      unsigned Reg = SavedRegs[I];
-      if (Reg == unsigned(FramePointerReg)) continue;
-      Encoding |= (Reg & 0x7) << (I * 3); // Register encoding
-    }
-  } else {
-    Encoding |= 0x02000000;     // Frameless unwind with small stack
-    Encoding |= (SavedRegIdx & 0x7) << 10;
-    Encoding |= permuteEncode(SavedRegIdx, SavedRegs);
-  }
-
-  return Encoding;
-}
diff --git a/lib/Target/X86/X86FrameLowering.h b/lib/Target/X86/X86FrameLowering.h
index a03ea76f50..1fb167f1e2 100644
--- a/lib/Target/X86/X86FrameLowering.h
+++ b/lib/Target/X86/X86FrameLowering.h
@@ -58,9 +58,6 @@ public:
   bool hasReservedCallFrame(const MachineFunction &MF) const;
 
   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
-
-  uint32_t getCompactUnwindEncoding(ArrayRef<MCCFIInstruction> Instrs,
-                                    int DataAlignmentFactor, bool IsEH) const;
 };
 
 } // End llvm namespace