1 files changed, 0 insertions, 165 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
index e5b2cf1..51d68fd 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -1605,168 +1605,3 @@ unsigned PPCInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
   }
 }
 
-#undef DEBUG_TYPE
-#define DEBUG_TYPE "ppc-early-ret"
-STATISTIC(NumBCLR, "Number of early conditional returns");
-STATISTIC(NumBLR,  "Number of early returns");
-
-namespace llvm {
-  void initializePPCEarlyReturnPass(PassRegistry&);
-}
-
-namespace {
-  // PPCEarlyReturn pass - For simple functions without epilogue code, move
-  // returns up, and create conditional returns, to avoid unnecessary
-  // branch-to-blr sequences.
-  struct PPCEarlyReturn : public MachineFunctionPass {
-    static char ID;
-    PPCEarlyReturn() : MachineFunctionPass(ID) {
-      initializePPCEarlyReturnPass(*PassRegistry::getPassRegistry());
-    }
-
-    const TargetInstrInfo *TII;
-
-protected:
-    bool processBlock(MachineBasicBlock &ReturnMBB) {
-      bool Changed = false;
-
-      MachineBasicBlock::iterator I = ReturnMBB.begin();
-      I = ReturnMBB.SkipPHIsAndLabels(I);
-
-      // The block must be essentially empty except for the blr.
-      if (I == ReturnMBB.end() ||
-          (I->getOpcode() != PPC::BLR && I->getOpcode() != PPC::BLR8) ||
-          I != ReturnMBB.getLastNonDebugInstr())
-        return Changed;
-
-      SmallVector<MachineBasicBlock*, 8> PredToRemove;
-      for (MachineBasicBlock::pred_iterator PI = ReturnMBB.pred_begin(),
-           PIE = ReturnMBB.pred_end(); PI != PIE; ++PI) {
-        bool OtherReference = false, BlockChanged = false;
-        for (MachineBasicBlock::iterator J = (*PI)->getLastNonDebugInstr();;) {
-          MachineInstrBuilder MIB;
-          if (J->getOpcode() == PPC::B) {
-            if (J->getOperand(0).getMBB() == &ReturnMBB) {
-              // This is an unconditional branch to the return. Replace the
-              // branch with a blr.
-              MIB =
-                BuildMI(**PI, J, J->getDebugLoc(), TII->get(I->getOpcode()));
-              MIB.copyImplicitOps(I);
-              MachineBasicBlock::iterator K = J--;
-              K->eraseFromParent();
-              BlockChanged = true;
-              ++NumBLR;
-              continue;
-            }
-          } else if (J->getOpcode() == PPC::BCC) {
-            if (J->getOperand(2).getMBB() == &ReturnMBB) {
-              // This is a conditional branch to the return. Replace the branch
-              // with a bclr.
-              MIB = BuildMI(**PI, J, J->getDebugLoc(), TII->get(PPC::BCCLR))
-                      .addImm(J->getOperand(0).getImm())
-                      .addReg(J->getOperand(1).getReg());
-              MIB.copyImplicitOps(I);
-              MachineBasicBlock::iterator K = J--;
-              K->eraseFromParent();
-              BlockChanged = true;
-              ++NumBCLR;
-              continue;
-            }
-          } else if (J->getOpcode() == PPC::BC || J->getOpcode() == PPC::BCn) {
-            if (J->getOperand(1).getMBB() == &ReturnMBB) {
-              // This is a conditional branch to the return. Replace the branch
-              // with a bclr.
-              MIB = BuildMI(**PI, J, J->getDebugLoc(),
-                            TII->get(J->getOpcode() == PPC::BC ?
-                                     PPC::BCLR : PPC::BCLRn))
-                      .addReg(J->getOperand(0).getReg());
-              MIB.copyImplicitOps(I);
-              MachineBasicBlock::iterator K = J--;
-              K->eraseFromParent();
-              BlockChanged = true;
-              ++NumBCLR;
-              continue;
-            }
-          } else if (J->isBranch()) {
-            if (J->isIndirectBranch()) {
-              if (ReturnMBB.hasAddressTaken())
-                OtherReference = true;
-            } else
-              for (unsigned i = 0; i < J->getNumOperands(); ++i)
-                if (J->getOperand(i).isMBB() &&
-                    J->getOperand(i).getMBB() == &ReturnMBB)
-                  OtherReference = true;
-          } else if (!J->isTerminator() && !J->isDebugValue())
-            break;
-
-          if (J == (*PI)->begin())
-            break;
-
-          --J;
-        }
-
-        if ((*PI)->canFallThrough() && (*PI)->isLayoutSuccessor(&ReturnMBB))
-          OtherReference = true;
-
-        // Predecessors are stored in a vector and can't be removed here.
-        if (!OtherReference && BlockChanged) {
-          PredToRemove.push_back(*PI);
-        }
-
-        if (BlockChanged)
-          Changed = true;
-      }
-
-      for (unsigned i = 0, ie = PredToRemove.size(); i != ie; ++i)
-        PredToRemove[i]->removeSuccessor(&ReturnMBB);
-
-      if (Changed && !ReturnMBB.hasAddressTaken()) {
-        // We now might be able to merge this blr-only block into its
-        // by-layout predecessor.
-        if (ReturnMBB.pred_size() == 1 &&
-            (*ReturnMBB.pred_begin())->isLayoutSuccessor(&ReturnMBB)) {
-          // Move the blr into the preceding block.
-          MachineBasicBlock &PrevMBB = **ReturnMBB.pred_begin();
-          PrevMBB.splice(PrevMBB.end(), &ReturnMBB, I);
-          PrevMBB.removeSuccessor(&ReturnMBB);
-        }
-
-        if (ReturnMBB.pred_empty())
-          ReturnMBB.eraseFromParent();
-      }
-
-      return Changed;
-    }
-
-public:
-    bool runOnMachineFunction(MachineFunction &MF) override {
-      TII = MF.getSubtarget().getInstrInfo();
-
-      bool Changed = false;
-
-      // If the function does not have at least two blocks, then there is
-      // nothing to do.
-      if (MF.size() < 2)
-        return Changed;
-
-      for (MachineFunction::iterator I = MF.begin(); I != MF.end();) {
-        MachineBasicBlock &B = *I++;
-        if (processBlock(B))
-          Changed = true;
-      }
-
-      return Changed;
-    }
-
-    void getAnalysisUsage(AnalysisUsage &AU) const override {
-      MachineFunctionPass::getAnalysisUsage(AU);
-    }
-  };
-}
-
-INITIALIZE_PASS(PPCEarlyReturn, DEBUG_TYPE,
-                "PowerPC Early-Return Creation", false, false)
-
-char PPCEarlyReturn::ID = 0;
-FunctionPass*
-llvm::createPPCEarlyReturnPass() { return new PPCEarlyReturn(); }