1 files changed, 0 insertions, 79 deletions
diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index 87f4a9946f2..a9b29818505 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -5577,85 +5577,6 @@ bool X86InstrInfo::isUnpredicatedTerminator(const MachineInstr &MI) const {
   return !isPredicated(MI);
 }
 
-bool X86InstrInfo::isUnconditionalTailCall(const MachineInstr &MI) const {
-  switch (MI.getOpcode()) {
-  case X86::TCRETURNdi:
-  case X86::TCRETURNri:
-  case X86::TCRETURNmi:
-  case X86::TCRETURNdi64:
-  case X86::TCRETURNri64:
-  case X86::TCRETURNmi64:
-    return true;
-  default:
-    return false;
-  }
-}
-
-bool X86InstrInfo::canMakeTailCallConditional(
-    SmallVectorImpl<MachineOperand> &BranchCond,
-    const MachineInstr &TailCall) const {
-  if (TailCall.getOpcode() != X86::TCRETURNdi &&
-      TailCall.getOpcode() != X86::TCRETURNdi64) {
-    // Only direct calls can be done with a conditional branch.
-    return false;
-  }
-
-  if (Subtarget.isTargetWin64()) {
-    // Conditional tail calls confuse the Win64 unwinder.
-    // TODO: Allow them for "leaf" functions; PR30337.
-    return false;
-  }
-
-  assert(BranchCond.size() == 1);
-  if (BranchCond[0].getImm() > X86::LAST_VALID_COND) {
-    // Can't make a conditional tail call with this condition.
-    return false;
-  }
-
-  const X86MachineFunctionInfo *X86FI =
-      TailCall.getParent()->getParent()->getInfo<X86MachineFunctionInfo>();
-  if (X86FI->getTCReturnAddrDelta() != 0 ||
-      TailCall.getOperand(1).getImm() != 0) {
-    // A conditional tail call cannot do any stack adjustment.
-    return false;
-  }
-
-  return true;
-}
-
-void X86InstrInfo::replaceBranchWithTailCall(
-    MachineBasicBlock &MBB, SmallVectorImpl<MachineOperand> &BranchCond,
-    const MachineInstr &TailCall) const {
-  assert(canMakeTailCallConditional(BranchCond, TailCall));
-
-  MachineBasicBlock::iterator I = MBB.end();
-  while (I != MBB.begin()) {
-    --I;
-    if (I->isDebugValue())
-      continue;
-    if (!I->isBranch())
-      assert(0 && "Can't find the branch to replace!");
-
-    X86::CondCode CC = getCondFromBranchOpc(I->getOpcode());
-    assert(BranchCond.size() == 1);
-    if (CC != BranchCond[0].getImm())
-      continue;
-
-    break;
-  }
-
-  unsigned Opc = TailCall.getOpcode() == X86::TCRETURNdi ? X86::TCRETURNdicc
-                                                         : X86::TCRETURNdi64cc;
-
-  auto MIB = BuildMI(MBB, I, MBB.findDebugLoc(I), get(Opc));
-  MIB->addOperand(TailCall.getOperand(0)); // Destination.
-  MIB.addImm(0); // Stack offset (not used).
-  MIB->addOperand(BranchCond[0]); // Condition.
-  MIB.copyImplicitOps(TailCall); // Regmask and (imp-used) parameters.
-
-  I->eraseFromParent();
-}
-
 // Given a MBB and its TBB, find the FBB which was a fallthrough MBB (it may
 // not be a fallthrough MBB now due to layout changes). Return nullptr if the
 // fallthrough MBB cannot be identified.