1 files changed, 0 insertions, 74 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
index b03b4ed..8aab5c2 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -557,80 +557,6 @@ bool SystemZInstrInfo::analyzeCompare(const MachineInstr &MI, unsigned &SrcReg,
   return false;
 }
 
-// If Reg is a virtual register, return its definition, otherwise return null.
-static MachineInstr *getDef(unsigned Reg,
-                            const MachineRegisterInfo *MRI) {
-  if (TargetRegisterInfo::isPhysicalRegister(Reg))
-    return nullptr;
-  return MRI->getUniqueVRegDef(Reg);
-}
-
-// Return true if MI is a shift of type Opcode by Imm bits.
-static bool isShift(MachineInstr *MI, unsigned Opcode, int64_t Imm) {
-  return (MI->getOpcode() == Opcode &&
-          !MI->getOperand(2).getReg() &&
-          MI->getOperand(3).getImm() == Imm);
-}
-
-// If the destination of MI has no uses, delete it as dead.
-static void eraseIfDead(MachineInstr *MI, const MachineRegisterInfo *MRI) {
-  if (MRI->use_nodbg_empty(MI->getOperand(0).getReg()))
-    MI->eraseFromParent();
-}
-
-// Compare compares SrcReg against zero.  Check whether SrcReg contains
-// the result of an IPM sequence whose input CC survives until Compare,
-// and whether Compare is therefore redundant.  Delete it and return
-// true if so.
-static bool removeIPMBasedCompare(MachineInstr &Compare, unsigned SrcReg,
-                                  const MachineRegisterInfo *MRI,
-                                  const TargetRegisterInfo *TRI) {
-  MachineInstr *LGFR = nullptr;
-  MachineInstr *RLL = getDef(SrcReg, MRI);
-  if (RLL && RLL->getOpcode() == SystemZ::LGFR) {
-    LGFR = RLL;
-    RLL = getDef(LGFR->getOperand(1).getReg(), MRI);
-  }
-  if (!RLL || !isShift(RLL, SystemZ::RLL, 31))
-    return false;
-
-  MachineInstr *SRL = getDef(RLL->getOperand(1).getReg(), MRI);
-  if (!SRL || !isShift(SRL, SystemZ::SRL, SystemZ::IPM_CC))
-    return false;
-
-  MachineInstr *IPM = getDef(SRL->getOperand(1).getReg(), MRI);
-  if (!IPM || IPM->getOpcode() != SystemZ::IPM)
-    return false;
-
-  // Check that there are no assignments to CC between the IPM and Compare,
-  if (IPM->getParent() != Compare.getParent())
-    return false;
-  MachineBasicBlock::iterator MBBI = IPM, MBBE = Compare.getIterator();
-  for (++MBBI; MBBI != MBBE; ++MBBI) {
-    MachineInstr &MI = *MBBI;
-    if (MI.modifiesRegister(SystemZ::CC, TRI))
-      return false;
-  }
-
-  Compare.eraseFromParent();
-  if (LGFR)
-    eraseIfDead(LGFR, MRI);
-  eraseIfDead(RLL, MRI);
-  eraseIfDead(SRL, MRI);
-  eraseIfDead(IPM, MRI);
-
-  return true;
-}
-
-bool SystemZInstrInfo::optimizeCompareInstr(
-    MachineInstr &Compare, unsigned SrcReg, unsigned SrcReg2, int Mask,
-    int Value, const MachineRegisterInfo *MRI) const {
-  assert(!SrcReg2 && "Only optimizing constant comparisons so far");
-  bool IsLogical = (Compare.getDesc().TSFlags & SystemZII::IsLogical) != 0;
-  return Value == 0 && !IsLogical &&
-         removeIPMBasedCompare(Compare, SrcReg, MRI, &RI);
-}
-
 bool SystemZInstrInfo::canInsertSelect(const MachineBasicBlock &MBB,
                                        ArrayRef<MachineOperand> Pred,
                                        unsigned TrueReg, unsigned FalseReg,