1 files changed, 0 insertions, 103 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 12211fe2c24..dfb5c0983cc 100644
--- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -282,109 +282,6 @@ SystemZInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
   return Count;
 }
 
-bool SystemZInstrInfo::analyzeCompare(const MachineInstr *MI,
-                                      unsigned &SrcReg, unsigned &SrcReg2,
-                                      int &Mask, int &Value) const {
-  assert(MI->isCompare() && "Caller should check that this is a compare");
-
-  // Ignore comparisons involving memory for now.
-  if (MI->getNumExplicitOperands() != 2)
-    return false;
-
-  SrcReg = MI->getOperand(0).getReg();
-  if (MI->getOperand(1).isReg()) {
-    SrcReg2 = MI->getOperand(1).getReg();
-    Value = 0;
-    Mask = ~0;
-    return true;
-  } else if (MI->getOperand(1).isImm()) {
-    SrcReg2 = 0;
-    Value = MI->getOperand(1).getImm();
-    Mask = ~0;
-    return true;
-  }
-  return false;
-}
-
-// Return true if CC is live after MBBI.  We can't rely on kill information
-// because of the way InsertBranch is used.
-static bool isCCLiveAfter(MachineBasicBlock::iterator MBBI,
-                          const TargetRegisterInfo *TRI) {
-  if (MBBI->killsRegister(SystemZ::CC, TRI))
-    return false;
-
-  MachineBasicBlock *MBB = MBBI->getParent();
-  MachineBasicBlock::iterator MBBE = MBB->end();
-  for (++MBBI; MBBI != MBBE; ++MBBI)
-    if (MBBI->readsRegister(SystemZ::CC, TRI))
-      return true;
-
-  for (MachineBasicBlock::succ_iterator SI = MBB->succ_begin(),
-         SE = MBB->succ_end(); SI != SE; ++SI)
-    if ((*SI)->isLiveIn(SystemZ::CC))
-      return true;
-
-  return false;
-}
-
-bool
-SystemZInstrInfo::optimizeCompareInstr(MachineInstr *Compare,
-                                       unsigned SrcReg, unsigned SrcReg2,
-                                       int Mask, int Value,
-                                       const MachineRegisterInfo *MRI) const {
-  MachineBasicBlock *MBB = Compare->getParent();
-  const TargetRegisterInfo *TRI = &getRegisterInfo();
-
-  // Try to fold a comparison into a following branch, if it is only used once.
-  if (unsigned FusedOpcode = getCompareAndBranch(Compare->getOpcode(),
-                                                 Compare)) {
-    MachineBasicBlock::iterator MBBI = Compare, MBBE = MBB->end();
-    for (++MBBI; MBBI != MBBE; ++MBBI) {
-      if (MBBI->getOpcode() == SystemZ::BRC && !isCCLiveAfter(MBBI, TRI)) {
-        // Read the branch mask and target.
-        MachineOperand CCMask(MBBI->getOperand(0));
-        MachineOperand Target(MBBI->getOperand(1));
-
-        // Clear out all current operands.
-        int CCUse = MBBI->findRegisterUseOperandIdx(SystemZ::CC, false, TRI);
-        assert(CCUse >= 0 && "BRC must use CC");
-        MBBI->RemoveOperand(CCUse);
-        MBBI->RemoveOperand(1);
-        MBBI->RemoveOperand(0);
-
-        // Rebuild MBBI as a fused compare and branch.
-        MBBI->setDesc(get(FusedOpcode));
-        MachineInstrBuilder(*MBB->getParent(), MBBI)
-          .addOperand(Compare->getOperand(0))
-          .addOperand(Compare->getOperand(1))
-          .addOperand(CCMask)
-          .addOperand(Target);
-
-        // Clear any intervening kills of SrcReg and SrcReg2.
-        MBBI = Compare;
-        for (++MBBI; MBBI != MBBE; ++MBBI) {
-          MBBI->clearRegisterKills(SrcReg, TRI);
-          if (SrcReg2)
-            MBBI->clearRegisterKills(SrcReg2, TRI);
-        }
-        Compare->removeFromParent();
-        return true;
-      }
-
-      // Stop if we find another reference to CC before a branch.
-      if (MBBI->readsRegister(SystemZ::CC, TRI) ||
-          MBBI->modifiesRegister(SystemZ::CC, TRI))
-        break;
-
-      // Stop if we find another assignment to the registers before the branch.
-      if (MBBI->modifiesRegister(SrcReg, TRI) ||
-          (SrcReg2 && MBBI->modifiesRegister(SrcReg2, TRI)))
-        break;
-    }
-  }
-  return false;
-}
-
 // If Opcode is a move that has a conditional variant, return that variant,
 // otherwise return 0.
 static unsigned getConditionalMove(unsigned Opcode) {