Index: include/llvm/InitializePasses.h
===================================================================
--- include/llvm/InitializePasses.h
+++ include/llvm/InitializePasses.h
@@ -80,6 +80,7 @@
 void initializeBranchProbabilityInfoWrapperPassPass(PassRegistry&);
 void initializeBranchRelaxationPass(PassRegistry&);
 void initializeBreakCriticalEdgesPass(PassRegistry&);
+void initializeCallSiteSplittingLegacyPassPass(PassRegistry&);
 void initializeCFGOnlyPrinterLegacyPassPass(PassRegistry&);
 void initializeCFGOnlyViewerLegacyPassPass(PassRegistry&);
 void initializeCFGPrinterLegacyPassPass(PassRegistry&);
Index: include/llvm/Transforms/Scalar.h
===================================================================
--- include/llvm/Transforms/Scalar.h
+++ include/llvm/Transforms/Scalar.h
@@ -73,6 +73,14 @@
 //
 FunctionPass *createDeadStoreEliminationPass();
 
+
+//===----------------------------------------------------------------------===//
+//
+// CallSiteSplitting - This pass split call-site based on its known argument
+// values.
+FunctionPass *createCallSiteSplittingPass();
+
+
 //===----------------------------------------------------------------------===//
 //
 // AggressiveDCE - This pass uses the SSA based Aggressive DCE algorithm.  This
Index: include/llvm/Transforms/Scalar/CallSiteSplitting.h
===================================================================
--- /dev/null
+++ include/llvm/Transforms/Scalar/CallSiteSplitting.h
@@ -0,0 +1,29 @@
+//===- CallSiteSplitting..h - Callsite Splitting ------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TRANSFORMS_SCALAR_CALLSITESPLITTING__H
+#define LLVM_TRANSFORMS_SCALAR_CALLSITESPLITTING__H
+
+#include "llvm/ADT/SetVector.h"
+#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/PassManager.h"
+#include "llvm/Support/Compiler.h"
+#include <vector>
+
+namespace llvm {
+
+struct CallSiteSplittingPass : PassInfoMixin<CallSiteSplittingPass> {
+  /// \brief Run the pass over the function.
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
+} // end namespace llvm
+
+#endif // LLVM_TRANSFORMS_SCALAR_CALLSITESPLITTING__H
Index: lib/Passes/PassBuilder.cpp
===================================================================
--- lib/Passes/PassBuilder.cpp
+++ lib/Passes/PassBuilder.cpp
@@ -88,6 +88,7 @@
 #include "llvm/Transforms/Scalar/ADCE.h"
 #include "llvm/Transforms/Scalar/AlignmentFromAssumptions.h"
 #include "llvm/Transforms/Scalar/BDCE.h"
+#include "llvm/Transforms/Scalar/CallSiteSplitting.h"
 #include "llvm/Transforms/Scalar/ConstantHoisting.h"
 #include "llvm/Transforms/Scalar/CorrelatedValuePropagation.h"
 #include "llvm/Transforms/Scalar/DCE.h"
@@ -547,6 +548,9 @@
   EarlyFPM.addPass(SROA());
   EarlyFPM.addPass(EarlyCSEPass());
   EarlyFPM.addPass(LowerExpectIntrinsicPass());
+  if (Level == O3)
+    EarlyFPM.addPass(CallSiteSplittingPass());
+
   // In SamplePGO ThinLTO backend, we need instcombine before profile annotation
   // to convert bitcast to direct calls so that they can be inlined during the
   // profile annotation prepration step.
@@ -910,13 +914,16 @@
   MPM.addPass(InferFunctionAttrsPass());
 
   if (Level > 1) {
+    FunctionPassManager EarlyFPM(DebugLogging);
+    EarlyFPM.addPass(CallSiteSplittingPass());
+    MPM.addPass(createModuleToFunctionPassAdaptor(std::move(EarlyFPM)));
+
     // Indirect call promotion. This should promote all the targets that are
     // left by the earlier promotion pass that promotes intra-module targets.
     // This two-step promotion is to save the compile time. For LTO, it should
     // produce the same result as if we only do promotion here.
     MPM.addPass(PGOIndirectCallPromotion(
         true /* InLTO */, PGOOpt && !PGOOpt->SampleProfileFile.empty()));
-
     // Propagate constants at call sites into the functions they call.  This
     // opens opportunities for globalopt (and inlining) by substituting function
     // pointers passed as arguments to direct uses of functions.
Index: lib/Passes/PassRegistry.def
===================================================================
--- lib/Passes/PassRegistry.def
+++ lib/Passes/PassRegistry.def
@@ -139,6 +139,7 @@
 FUNCTION_PASS("alignment-from-assumptions", AlignmentFromAssumptionsPass())
 FUNCTION_PASS("bdce", BDCEPass())
 FUNCTION_PASS("break-crit-edges", BreakCriticalEdgesPass())
+FUNCTION_PASS("callsite-splitting", CallSiteSplittingPass())
 FUNCTION_PASS("consthoist", ConstantHoistingPass())
 FUNCTION_PASS("correlated-propagation", CorrelatedValuePropagationPass())
 FUNCTION_PASS("dce", DCEPass())
Index: lib/Transforms/IPO/PassManagerBuilder.cpp
===================================================================
--- lib/Transforms/IPO/PassManagerBuilder.cpp
+++ lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -459,6 +459,9 @@
 
   addExtensionsToPM(EP_ModuleOptimizerEarly, MPM);
 
+  if (OptLevel > 2)
+    MPM.add(createCallSiteSplittingPass());
+
   MPM.add(createIPSCCPPass());          // IP SCCP
   MPM.add(createGlobalOptimizerPass()); // Optimize out global vars
   // Promote any localized global vars.
@@ -692,6 +695,9 @@
   PM.add(createInferFunctionAttrsLegacyPass());
 
   if (OptLevel > 1) {
+    // Split call-site with more constrained arguments.
+    PM.add(createCallSiteSplittingPass());
+
     // Indirect call promotion. This should promote all the targets that are
     // left by the earlier promotion pass that promotes intra-module targets.
     // This two-step promotion is to save the compile time. For LTO, it should
Index: lib/Transforms/Scalar/CMakeLists.txt
===================================================================
--- lib/Transforms/Scalar/CMakeLists.txt
+++ lib/Transforms/Scalar/CMakeLists.txt
@@ -2,6 +2,7 @@
   ADCE.cpp
   AlignmentFromAssumptions.cpp
   BDCE.cpp
+  CallSiteSplitting.cpp
   ConstantHoisting.cpp
   ConstantProp.cpp
   CorrelatedValuePropagation.cpp
Index: lib/Transforms/Scalar/CallSiteSplitting.cpp
===================================================================
--- /dev/null
+++ lib/Transforms/Scalar/CallSiteSplitting.cpp
@@ -0,0 +1,488 @@
+//===- CallSiteSplitting.cpp ----------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a transformation that tries to split a call-site to pass
+// more constrained arguments if its argument is predicated in the control flow
+// so that we can expose better context to the later passes (e.g, inliner, jump
+// threading, or IPA-CP based function cloning, etc.).
+// As of now we support two cases :
+//
+// 1) If a call site is dominated by an OR condition and if any of its arguments
+// are predicated on this OR condition, try to split the condition with more
+// constrained arguments. For example, in the code below, we try to split the
+// call site since we can predicate the argument(ptr) based on the OR condition.
+//
+// Split from :
+//   if (!ptr || c)
+//     callee(ptr);
+// to :
+//   if (!ptr)
+//     callee(null)         // set the known constant value
+//   else if (c)
+//     callee(nonnull ptr)  // set non-null attribute in the argument
+//
+//
+// 2) We can also split a call-site based on constant incoming values of a PHI
+// For example,
+// from :
+//   Header:
+//    %c = icmp eq i32 %i1, %i2
+//    br i1 %c, label %Tail, label %TBB
+//   TBB:
+//    br label Tail%
+//   Tail:
+//    %p = phi i32 [ 0, %Header], [ 1, %TBB]
+//    call void @bar(i32 %p)
+// to
+//   Header:
+//    %c = icmp eq i32 %i1, %i2
+//    br i1 %c, label %Tail-split0, label %TBB
+//   TBB:
+//    br label %Tail-split1
+//   Tail-split0:
+//    call void @bar(i32 0)
+//    br label %Tail
+//   Tail-split1:
+//    call void @bar(i32 1)
+//    br label %Tail
+//   Tail:
+//    %p = phi i32 [ 0, %Tail-split0 ], [ 1, %Tail-split1 ]
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Scalar/CallSiteSplitting.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/PatternMatch.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/Transforms/Utils/BasicBlockUtils.h"
+#include "llvm/Transforms/Utils/Local.h"
+
+using namespace llvm;
+using namespace PatternMatch;
+
+#define DEBUG_TYPE "callsite-splitting"
+
+STATISTIC(NumCallSiteSplit, "Number of call-site split");
+
+static void addNonNullAttribute(Instruction *CallI, Instruction *&NewCallI,
+                                Value *Op) {
+  if (!NewCallI)
+    NewCallI = CallI->clone();
+  CallSite CS(NewCallI);
+  unsigned ArgNo = 0;
+  for (auto &I : CS.args()) {
+    if (&*I == Op)
+      CS.addParamAttr(ArgNo, Attribute::NonNull);
+    ++ArgNo;
+  }
+}
+
+static void setConstantInArgument(Instruction *CallI, Instruction *&NewCallI,
+                                  Value *Op, Constant *ConstValue) {
+  if (!NewCallI)
+    NewCallI = CallI->clone();
+  CallSite CS(NewCallI);
+  unsigned ArgNo = 0;
+  for (auto &I : CS.args()) {
+    if (&*I == Op)
+      CS.setArgument(ArgNo, ConstValue);
+    ++ArgNo;
+  }
+}
+
+static bool createCallSitesOnOrPredicatedArgument(
+    CallSite CS, Instruction *&NewCSTakenFromHeader,
+    Instruction *&NewCSTakenFromNextCond,
+    SmallVectorImpl<BranchInst *> &BranchInsts, BasicBlock *HeaderBB) {
+  assert(BranchInsts.size() <= 2 &&
+         "Unexpected number of blocks in the OR predicated condition");
+  Instruction *Instr = CS.getInstruction();
+  BasicBlock *CallSiteBB = Instr->getParent();
+  TerminatorInst *HeaderTI = HeaderBB->getTerminator();
+  bool IsCSInTakenPath = CallSiteBB == HeaderTI->getSuccessor(0);
+
+  for (unsigned I = 0, E = BranchInsts.size(); I != E; ++I) {
+    BranchInst *PBI = BranchInsts[I];
+    assert(isa<ICmpInst>(PBI->getCondition()) &&
+           "Unexpected condition in a conditional branch.");
+    ICmpInst *Cmp = cast<ICmpInst>(PBI->getCondition());
+    Value *Arg = Cmp->getOperand(0);
+    assert(isa<Constant>(Cmp->getOperand(1)) &&
+           "Expected op1 to be a constant.");
+    Constant *ConstVal = cast<Constant>(Cmp->getOperand(1));
+    CmpInst::Predicate Pred = Cmp->getPredicate();
+
+    if (PBI->getParent() == HeaderBB) {
+      Instruction *&CallTakenFromHeader =
+          IsCSInTakenPath ? NewCSTakenFromHeader : NewCSTakenFromNextCond;
+      Instruction *&CallUntakenFromHeader =
+          IsCSInTakenPath ? NewCSTakenFromNextCond : NewCSTakenFromHeader;
+
+      assert(Pred == ICmpInst::ICMP_EQ ||
+             Pred == ICmpInst::ICMP_NE &&
+                 "Unexpected predicate in an OR condition");
+
+      // Set the constant value for agruments in the call predicated based on
+      // the OR condition.
+      Instruction *&CallToSetConst = Pred == ICmpInst::ICMP_EQ
+                                         ? CallTakenFromHeader
+                                         : CallUntakenFromHeader;
+      setConstantInArgument(Instr, CallToSetConst, Arg, ConstVal);
+
+      // Add the NonNull attribute if compared with the null pointer.
+      if (ConstVal->getType()->isPointerTy() && ConstVal->isNullValue()) {
+        Instruction *&CallToSetAttr = Pred == ICmpInst::ICMP_EQ
+                                          ? CallUntakenFromHeader
+                                          : CallTakenFromHeader;
+        addNonNullAttribute(Instr, CallToSetAttr, Arg);
+      }
+      continue;
+    }
+
+    if (Pred == ICmpInst::ICMP_EQ) {
+      if (PBI->getSuccessor(0) == Instr->getParent()) {
+        // Set the constant value for the call taken from the second block in
+        // the OR condition.
+        setConstantInArgument(Instr, NewCSTakenFromNextCond, Arg, ConstVal);
+      } else {
+        // Add the NonNull attribute if compared with the null pointer for the
+        // call taken from the second block in the OR condition.
+        if (ConstVal->getType()->isPointerTy() && ConstVal->isNullValue())
+          addNonNullAttribute(Instr, NewCSTakenFromNextCond, Arg);
+      }
+    } else {
+      if (PBI->getSuccessor(0) == Instr->getParent()) {
+        // Add the NonNull attribute if compared with the null pointer for the
+        // call taken from the second block in the OR condition.
+        if (ConstVal->getType()->isPointerTy() && ConstVal->isNullValue())
+          addNonNullAttribute(Instr, NewCSTakenFromNextCond, Arg);
+      } else if (Pred == ICmpInst::ICMP_NE) {
+        // Set the constant value for the call in the untaken path from the
+        // header block.
+        setConstantInArgument(Instr, NewCSTakenFromNextCond, Arg, ConstVal);
+      } else
+        llvm_unreachable("Unexpected condition");
+    }
+  }
+  return NewCSTakenFromHeader || NewCSTakenFromNextCond;
+}
+
+static bool canSplitCallSite(CallSite CS) {
+  // FIXME: As of now we handle only CallInst. InvokeInst could be handled
+  // without too much effort.
+  Instruction *Instr = CS.getInstruction();
+  if (!isa<CallInst>(Instr))
+    return false;
+
+  // Allow splitting a call-site only when there is no instruction before the
+  // call-site in the basic block. Based on this constraint, we only clone the
+  // call instruction, and we do not move a call-site across any other
+  // instruction.
+  BasicBlock *CallSiteBB = Instr->getParent();
+  if (Instr != CallSiteBB->getFirstNonPHI())
+    return false;
+
+  pred_iterator PII = pred_begin(CallSiteBB);
+  pred_iterator PIE = pred_end(CallSiteBB);
+  unsigned NumPreds = std::distance(PII, PIE);
+
+  // Allow only one extra call-site. No more than two from one call-site.
+  if (NumPreds != 2)
+    return false;
+
+  // Cannot split an edge from an IndirectBrInst.
+  BasicBlock *Preds[2] = {*PII++, *PII};
+  if (isa<IndirectBrInst>(Preds[0]->getTerminator()) ||
+      isa<IndirectBrInst>(Preds[1]->getTerminator()))
+    return false;
+
+  return CallSiteBB->canSplitPredecessors();
+}
+
+/// Return true if the CS is split into its new predecessors which are directly
+/// hooked to each of its orignial predecessors pointed by PredBB1 and PredBB2.
+/// Note that PredBB1 and PredBB2 are decided in findPredicatedArgument(),
+/// especially for the OR predicated case where PredBB1 will point the header,
+/// and PredBB2 will point the the second compare block. CallInst1 and CallInst2
+/// will be the new call-sites placed in the new predecessors split for PredBB1
+/// and PredBB2, repectively. Therefore, CallInst1 will be the call-site placed
+/// between Header and Tail, and CallInst2 will be the call-site between TBB and
+/// Tail. For example, in the IR below with an OR condition, the call-site can
+/// be split
+///
+/// from :
+///
+///   Header:
+///     %c = icmp eq i32* %a, null
+///     br i1 %c %Tail, %TBB
+///   TBB:
+///     %c2 = icmp eq i32* %b, null
+///     br i1 %c %Tail, %End
+///   Tail:
+///     %ca = call i1  @callee (i32* %a, i32* %b)
+///
+///  to :
+///
+///   Header:                          // PredBB1 is Header
+///     %c = icmp eq i32* %a, null
+///     br i1 %c %Tail-split1, %TBB
+///   TBB:                             // PredBB2 is TBB
+///     %c2 = icmp eq i32* %b, null
+///     br i1 %c %Tail-split2, %End
+///   Tail-split1:
+///     %ca1 = call @callee (i32* null, i32* %b)         // CallInst1
+///    br %Tail
+///   Tail-split2:
+///     %ca2 = call @callee (i32* nonnull %a, i32* null) // CallInst2
+///    br %Tail
+///   Tail:
+///    %p = phi i1 [%ca1, %Tail-split1],[%ca2, %Tail-split2]
+///
+/// Note that for an OR predicated case, CallInst1 and CallInst2 should be
+/// created with more constrained arguments in
+/// createCallSitesOnOrPredicatedArgument().
+static void splitCallSite(CallSite CS, BasicBlock *PredBB1, BasicBlock *PredBB2,
+                          Instruction *CallInst1, Instruction *CallInst2) {
+  Instruction *Instr = CS.getInstruction();
+  BasicBlock *TailBB = Instr->getParent();
+  assert(Instr == (TailBB->getFirstNonPHI()) && "Unexpected call-site");
+
+  BasicBlock *SplitBlock1 =
+      SplitBlockPredecessors(TailBB, PredBB1, ".predBB1.split");
+  BasicBlock *SplitBlock2 =
+      SplitBlockPredecessors(TailBB, PredBB2, ".predBB2.split");
+
+  assert((SplitBlock1 && SplitBlock2) && "Unexpected new basic block split.");
+
+  if (!CallInst1)
+    CallInst1 = Instr->clone();
+  if (!CallInst2)
+    CallInst2 = Instr->clone();
+
+  CallInst1->insertBefore(&*SplitBlock1->getFirstInsertionPt());
+  CallInst2->insertBefore(&*SplitBlock2->getFirstInsertionPt());
+
+  CallSite CS1(CallInst1);
+  CallSite CS2(CallInst2);
+
+  // Handle PHIs used as arguments in the call-site.
+  for (auto &PI : *TailBB) {
+    PHINode *PN = dyn_cast<PHINode>(&PI);
+    if (!PN)
+      break;
+    unsigned ArgNo = 0;
+    for (auto &CI : CS.args()) {
+      if (&*CI == PN) {
+        CS1.setArgument(ArgNo, PN->getIncomingValueForBlock(SplitBlock1));
+        CS2.setArgument(ArgNo, PN->getIncomingValueForBlock(SplitBlock2));
+      }
+      ++ArgNo;
+    }
+  }
+
+  // Replace users of the original call with a PHI mering call-sites split.
+  if (Instr->getNumUses()) {
+    PHINode *PN = PHINode::Create(Instr->getType(), 2, "phi.call", Instr);
+    PN->addIncoming(CallInst1, SplitBlock1);
+    PN->addIncoming(CallInst2, SplitBlock2);
+    Instr->replaceAllUsesWith(PN);
+  }
+  Instr->eraseFromParent();
+  NumCallSiteSplit++;
+}
+
+static bool isCondRelevantToAnyCallArgument(ICmpInst *Cmp, CallSite CS) {
+  assert(isa<Constant>(Cmp->getOperand(1)) && "Expected a constant operand.");
+  Value *Op0 = Cmp->getOperand(0);
+  unsigned ArgNo = 0;
+  for (CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end(); I != E;
+       ++I, ++ArgNo) {
+    // Don't consider constant or arguments that are already known non-null.
+    if (isa<Constant>(*I) || CS.paramHasAttr(ArgNo, Attribute::NonNull))
+      continue;
+
+    if (*I == Op0)
+      return true;
+  }
+  return false;
+}
+
+static void findOrCondRelevantToCallArgument(
+    CallSite CS, BasicBlock *PredBB, BasicBlock *OtherPredBB,
+    SmallVectorImpl<BranchInst *> &BranchInsts, BasicBlock *&HeaderBB) {
+  auto *PBI = dyn_cast<BranchInst>(PredBB->getTerminator());
+  if (!PBI || !PBI->isConditional())
+    return;
+
+  if (PBI->getSuccessor(0) == OtherPredBB ||
+      PBI->getSuccessor(1) == OtherPredBB)
+    if (PredBB == OtherPredBB->getSinglePredecessor()) {
+      assert(!HeaderBB && "Expect to find only a single header block");
+      HeaderBB = PredBB;
+    }
+
+  CmpInst::Predicate Pred;
+  Value *Cond = PBI->getCondition();
+  if (!match(Cond, m_ICmp(Pred, m_Value(), m_Constant())))
+    return;
+  ICmpInst *Cmp = cast<ICmpInst>(Cond);
+  if (Pred == ICmpInst::ICMP_EQ || Pred == ICmpInst::ICMP_NE)
+    if (isCondRelevantToAnyCallArgument(Cmp, CS))
+      BranchInsts.push_back(PBI);
+}
+
+// Return true if the call-site has an argument which is a PHI with only
+// constant incoming values.
+static bool isPredicatedOnPHI(CallSite CS) {
+  Instruction *Instr = CS.getInstruction();
+  BasicBlock *Parent = Instr->getParent();
+  if (Instr != Parent->getFirstNonPHI())
+    return false;
+
+  for (auto &BI : *Parent) {
+    if (PHINode *PN = dyn_cast<PHINode>(&BI)) {
+      for (auto &I : CS.args())
+        if (&*I == PN) {
+          assert(PN->getNumIncomingValues() == 2 &&
+                 "Unexpected number of incoming values");
+          if (PN->getIncomingBlock(0) == PN->getIncomingBlock(1))
+            return false;
+          if (PN->getIncomingValue(0) == PN->getIncomingValue(1))
+            continue;
+          if (isa<Constant>(PN->getIncomingValue(0)) &&
+              isa<Constant>(PN->getIncomingValue(1)))
+            return true;
+        }
+    }
+    break;
+  }
+  return false;
+}
+
+// Return true if an agument in CS is predicated on an 'or' condition.
+// Create new call-site with arguments constrained based on the OR condition.
+static bool findPredicatedOnOrCondition(CallSite CS, BasicBlock *PredBB1,
+                                        BasicBlock *PredBB2,
+                                        Instruction *&NewCallTakenFromHeader,
+                                        Instruction *&NewCallTakenFromNextCond,
+                                        BasicBlock *&HeaderBB) {
+  SmallVector<BranchInst *, 4> BranchInsts;
+  findOrCondRelevantToCallArgument(CS, PredBB1, PredBB2, BranchInsts, HeaderBB);
+  findOrCondRelevantToCallArgument(CS, PredBB2, PredBB1, BranchInsts, HeaderBB);
+  if (BranchInsts.empty() || !HeaderBB)
+    return false;
+
+  // If an OR condition is detected, try to create call sites with constrained
+  // arguments (e.g., NonNull attribute or constant value).
+  return createCallSitesOnOrPredicatedArgument(CS, NewCallTakenFromHeader,
+                                               NewCallTakenFromNextCond,
+                                               BranchInsts, HeaderBB);
+}
+
+static bool findPredicatedArgument(CallSite CS, Instruction *&CallInst1,
+                                   Instruction *&CallInst2,
+                                   BasicBlock *&PredBB1, BasicBlock *&PredBB2) {
+  BasicBlock *CallSiteBB = CS.getInstruction()->getParent();
+  pred_iterator PII = pred_begin(CallSiteBB);
+  pred_iterator PIE = pred_end(CallSiteBB);
+  assert(std::distance(PII, PIE) == 2 && "Expect only two predecessors.");
+  BasicBlock *Preds[2] = {*PII++, *PII};
+  BasicBlock *&HeaderBB = PredBB1;
+  if (!findPredicatedOnOrCondition(CS, Preds[0], Preds[1], CallInst1, CallInst2,
+                                   HeaderBB) &&
+      !isPredicatedOnPHI(CS))
+    return false;
+
+  if (!PredBB1)
+    PredBB1 = Preds[0];
+
+  PredBB2 = PredBB1 == Preds[0] ? Preds[1] : Preds[0];
+  return true;
+}
+
+static bool tryToSplitCallSite(CallSite CS) {
+  if (!CS.arg_size())
+    return false;
+
+  BasicBlock *PredBB1 = nullptr;
+  BasicBlock *PredBB2 = nullptr;
+  Instruction *CallInst1 = nullptr;
+  Instruction *CallInst2 = nullptr;
+  if (!canSplitCallSite(CS) ||
+      !findPredicatedArgument(CS, CallInst1, CallInst2, PredBB1, PredBB2)) {
+    assert(!CallInst1 && !CallInst2 && "Unexpected new call-sites cloned.");
+    return false;
+  }
+  splitCallSite(CS, PredBB1, PredBB2, CallInst1, CallInst2);
+  return true;
+}
+
+static bool doCallSiteSplitting(Function &F, TargetLibraryInfo &TLI) {
+  bool Changed = false;
+  for (Function::iterator BI = F.begin(), BE = F.end(); BI != BE;) {
+    BasicBlock &BB = *BI++;
+    for (BasicBlock::iterator II = BB.begin(), IE = BB.end(); II != IE;) {
+      Instruction *I = &*II++;
+      CallSite CS(cast<Value>(I));
+      if (!CS || isa<IntrinsicInst>(I) || isInstructionTriviallyDead(I, &TLI))
+        continue;
+
+      Function *Callee = CS.getCalledFunction();
+      if (!Callee || Callee->isDeclaration())
+        continue;
+      Changed |= tryToSplitCallSite(CS);
+    }
+  }
+  return Changed;
+}
+
+namespace {
+struct CallSiteSplittingLegacyPass : public FunctionPass {
+  static char ID;
+  CallSiteSplittingLegacyPass() : FunctionPass(ID) {
+    initializeCallSiteSplittingLegacyPassPass(*PassRegistry::getPassRegistry());
+  }
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.addRequired<TargetLibraryInfoWrapperPass>();
+    FunctionPass::getAnalysisUsage(AU);
+  }
+
+  bool runOnFunction(Function &F) override {
+    if (skipFunction(F))
+      return false;
+
+    auto &TLI = getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
+    return doCallSiteSplitting(F, TLI);
+  }
+};
+} // namespace
+
+char CallSiteSplittingLegacyPass::ID = 0;
+INITIALIZE_PASS_BEGIN(CallSiteSplittingLegacyPass, "callsite-splitting",
+                      "Call-site splitting", false, false)
+INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
+INITIALIZE_PASS_END(CallSiteSplittingLegacyPass, "callsite-splitting",
+                    "Call-site splitting", false, false)
+FunctionPass *llvm::createCallSiteSplittingPass() {
+  return new CallSiteSplittingLegacyPass();
+}
+
+PreservedAnalyses CallSiteSplittingPass::run(Function &F,
+                                             FunctionAnalysisManager &AM) {
+  auto &TLI = AM.getResult<TargetLibraryAnalysis>(F);
+
+  if (!doCallSiteSplitting(F, TLI))
+    return PreservedAnalyses::all();
+  PreservedAnalyses PA;
+  return PA;
+}
Index: lib/Transforms/Scalar/Scalar.cpp
===================================================================
--- lib/Transforms/Scalar/Scalar.cpp
+++ lib/Transforms/Scalar/Scalar.cpp
@@ -35,6 +35,7 @@
   initializeADCELegacyPassPass(Registry);
   initializeBDCELegacyPassPass(Registry);
   initializeAlignmentFromAssumptionsPass(Registry);
+  initializeCallSiteSplittingLegacyPassPass(Registry);
   initializeConstantHoistingLegacyPassPass(Registry);
   initializeConstantPropagationPass(Registry);
   initializeCorrelatedValuePropagationPass(Registry);
Index: test/Other/new-pm-defaults.ll
===================================================================
--- test/Other/new-pm-defaults.ll
+++ test/Other/new-pm-defaults.ll
@@ -76,6 +76,7 @@
 ; CHECK-O-NEXT: Running pass: EarlyCSEPass
 ; CHECK-O-NEXT: Running analysis: TargetLibraryAnalysis
 ; CHECK-O-NEXT: Running pass: LowerExpectIntrinsicPass
+; CHECK-O3-NEXT: Running pass: CallSiteSplittingPass
 ; CHECK-O-NEXT: Finished llvm::Function pass manager run.
 ; CHECK-O-NEXT: Running pass: IPSCCPPass
 ; CHECK-O-NEXT: Running pass: GlobalOptPass
Index: test/Other/new-pm-lto-defaults.ll
===================================================================
--- test/Other/new-pm-lto-defaults.ll
+++ test/Other/new-pm-lto-defaults.ll
@@ -28,20 +28,27 @@
 ; CHECK-O-NEXT: Running pass: GlobalDCEPass
 ; CHECK-O-NEXT: Running pass: ForceFunctionAttrsPass
 ; CHECK-O-NEXT: Running pass: InferFunctionAttrsPass
-; CHECK-O-NEXT: Running analysis: TargetLibraryAnalysis
+; CHECK-O2-NEXT: Running analysis: TargetLibraryAnalysis
+; CHECK-O2-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>
+; CHECK-O2-NEXT: Running analysis: InnerAnalysisManagerProxy<{{.*}}Function
+; CHECK-O2-NEXT: Starting llvm::Function pass manager run.
+; CHECK-O2-NEXT: Running pass: CallSiteSplittingPass
+; CHECK-O2-NEXT: Running analysis: TargetLibraryAnalysis
+; CHECK-O2-NEXT: Finished llvm::Function pass manager run.
 ; CHECK-O2-NEXT: PGOIndirectCallPromotion
 ; CHECK-O2-NEXT: Running analysis: ProfileSummaryAnalysis
-; CHECK-O2-NEXT: Running analysis: InnerAnalysisManagerProxy<{{.*}}Function
 ; CHECK-O2-NEXT: Running analysis: OptimizationRemarkEmitterAnalysis
 ; CHECK-O2-NEXT: Running pass: IPSCCPPass
-; CHECK-O-NEXT: Running pass: ModuleToPostOrderCGSCCPassAdaptor<{{.*}}PostOrderFunctionAttrsPass>
+; CHECK-O2-NEXT: Running pass: ModuleToPostOrderCGSCCPassAdaptor<{{.*}}PostOrderFunctionAttrsPass>
+; CHECK-O1-NEXT: Running analysis: TargetLibraryAnalysis
+; CHECK-O1-NEXT: Running pass: ModuleToPostOrderCGSCCPassAdaptor<{{.*}}PostOrderFunctionAttrsPass>
 ; CHECK-O-NEXT: Running analysis: InnerAnalysisManagerProxy<{{.*}}SCC
 ; CHECK-O1-NEXT: Running analysis: InnerAnalysisManagerProxy<{{.*}}Function
 ; CHECK-O-NEXT: Running analysis: LazyCallGraphAnalysis
 ; CHECK-O-NEXT: Running analysis: FunctionAnalysisManagerCGSCCProxy
 ; CHECK-O-NEXT: Running analysis: OuterAnalysisManagerProxy<{{.*}}LazyCallGraph{{.*}}>
 ; CHECK-O-NEXT: Running analysis: AAManager
-; CHECK-O-NEXT: Running analysis: TargetLibraryAnalysis
+; CHECK-O1-NEXT: Running analysis: TargetLibraryAnalysis
 ; CHECK-O-NEXT: Running pass: ReversePostOrderFunctionAttrsPass
 ; CHECK-O-NEXT: Running analysis: CallGraphAnalysis
 ; CHECK-O-NEXT: Running pass: GlobalSplitPass
Index: test/Other/new-pm-thinlto-defaults.ll
===================================================================
--- test/Other/new-pm-thinlto-defaults.ll
+++ test/Other/new-pm-thinlto-defaults.ll
@@ -72,6 +72,7 @@
 ; CHECK-O-NEXT: Running pass: EarlyCSEPass
 ; CHECK-O-NEXT: Running analysis: TargetLibraryAnalysis
 ; CHECK-O-NEXT: Running pass: LowerExpectIntrinsicPass
+; CHECK-O3-NEXT: Running pass: CallSiteSplittingPass
 ; CHECK-O-NEXT: Finished llvm::Function pass manager run.
 ; CHECK-O-NEXT: Running pass: IPSCCPPass
 ; CHECK-O-NEXT: Running pass: GlobalOptPass
Index: test/Transforms/CallSiteSplitting/callsite-split-or-phi.ll
===================================================================
--- /dev/null
+++ test/Transforms/CallSiteSplitting/callsite-split-or-phi.ll
@@ -0,0 +1,339 @@
+; RUN: opt < %s -callsite-splitting -S | FileCheck %s
+; RUN: opt < %s  -passes='function(callsite-splitting)' -S | FileCheck %s
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-linaro-linux-gnueabi"
+
+;CHECK-LABEL: @test_eq_eq
+;CHECK-LABEL: Tail.predBB1.split:
+;CHECK: %[[CALL1:.*]] = call i32 @callee(i32* null, i32 %v, i32 1)
+;CHECK-LABEL: Tail.predBB2.split:
+;CHECK: %[[CALL2:.*]] = call i32 @callee(i32* nonnull %a, i32 1, i32 2)
+;CHECK-LABEL: Tail
+;CHECK: %p = phi i32 [ 1, %Tail.predBB1.split ], [ 2, %Tail.predBB2.split ]
+;CHECK: %[[MERGED:.*]] = phi i32 [ %[[CALL1]], %Tail.predBB1.split ], [ %[[CALL2]], %Tail.predBB2.split ]
+;CHECK: ret i32 %[[MERGED]]
+define i32 @test_eq_eq(i32* %a, i32 %v) {
+Header:
+  %tobool1 = icmp eq i32* %a, null
+  br i1 %tobool1, label %Tail, label %TBB
+
+TBB:
+  %cmp = icmp eq i32 %v, 1
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_ne_eq
+;CHECK-LABEL: Tail.predBB1.split:
+;CHECK: %[[CALL1:.*]] = call i32 @callee(i32* nonnull %a, i32 %v, i32 1)
+;CHECK-LABEL: Tail.predBB2.split:
+;CHECK: %[[CALL2:.*]] = call i32 @callee(i32* null, i32 1, i32 2)
+;CHECK-LABEL: Tail
+;CHECK: %p = phi i32 [ 1, %Tail.predBB1.split ], [ 2, %Tail.predBB2.split ]
+;CHECK: %[[MERGED:.*]] = phi i32 [ %[[CALL1]], %Tail.predBB1.split ], [ %[[CALL2]], %Tail.predBB2.split ]
+;CHECK: ret i32 %[[MERGED]]
+define i32 @test_ne_eq(i32* %a, i32 %v) {
+Header:
+  %tobool1 = icmp ne i32* %a, null
+  br i1 %tobool1, label %Tail, label %TBB
+
+TBB:
+  %cmp = icmp eq i32 %v, 1
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_ne_ne
+;CHECK-LABEL: Tail.predBB1.split:
+;CHECK: %[[CALL1:.*]] = call i32 @callee(i32* nonnull %a, i32 %v, i32 1)
+;CHECK-LABEL: Tail.predBB2.split:
+;CHECK: %[[CALL2:.*]] = call i32 @callee(i32* null, i32 %v, i32 2)
+;CHECK-LABEL: Tail
+;CHECK: %p = phi i32 [ 1, %Tail.predBB1.split ], [ 2, %Tail.predBB2.split ]
+;CHECK: %[[MERGED:.*]] = phi i32 [ %[[CALL1]], %Tail.predBB1.split ], [ %[[CALL2]], %Tail.predBB2.split ]
+;CHECK: ret i32 %[[MERGED]]
+define i32 @test_ne_ne(i32* %a, i32 %v) {
+Header:
+  %tobool1 = icmp ne i32* %a, null
+  br i1 %tobool1, label %Tail, label %TBB
+
+TBB:
+  %cmp = icmp ne i32 %v, 1
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_eq_eq_untaken
+;CHECK-LABEL: Tail.predBB1.split:
+;CHECK: %[[CALL1:.*]] = call i32 @callee(i32* nonnull %a, i32 %v, i32 1)
+;CHECK-LABEL: Tail.predBB2.split:
+;CHECK: %[[CALL2:.*]] = call i32 @callee(i32* null, i32 1, i32 2)
+;CHECK-LABEL: Tail
+;CHECK: %p = phi i32 [ 1, %Tail.predBB1.split ], [ 2, %Tail.predBB2.split ]
+;CHECK: %[[MERGED:.*]] = phi i32 [ %[[CALL1]], %Tail.predBB1.split ], [ %[[CALL2]], %Tail.predBB2.split ]
+;CHECK: ret i32 %[[MERGED]]
+define i32 @test_eq_eq_untaken(i32* %a, i32 %v) {
+Header:
+  %tobool1 = icmp eq i32* %a, null
+  br i1 %tobool1, label %TBB, label %Tail
+
+TBB:
+  %cmp = icmp eq i32 %v, 1
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_ne_eq_untaken
+;CHECK-LABEL: Tail.predBB1.split:
+;CHECK: %[[CALL1:.*]] = call i32 @callee(i32* null, i32 %v, i32 1)
+;CHECK-LABEL: Tail.predBB2.split:
+;CHECK: %[[CALL2:.*]] = call i32 @callee(i32* nonnull %a, i32 1, i32 2)
+;CHECK-LABEL: Tail
+;CHECK: %p = phi i32 [ 1, %Tail.predBB1.split ], [ 2, %Tail.predBB2.split ]
+;CHECK: %[[MERGED:.*]] = phi i32 [ %[[CALL1]], %Tail.predBB1.split ], [ %[[CALL2]], %Tail.predBB2.split ]
+;CHECK: ret i32 %[[MERGED]]
+define i32 @test_ne_eq_untaken(i32* %a, i32 %v) {
+Header:
+  %tobool1 = icmp ne i32* %a, null
+  br i1 %tobool1, label %TBB, label %Tail
+
+TBB:
+  %cmp = icmp eq i32 %v, 1
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_ne_ne_untaken
+;CHECK-LABEL: Tail.predBB1.split:
+;CHECK: %[[CALL1:.*]] = call i32 @callee(i32* null, i32 %v, i32 1)
+;CHECK-LABEL: Tail.predBB2.split:
+;CHECK: %[[CALL2:.*]] = call i32 @callee(i32* nonnull %a, i32 1, i32 2)
+;CHECK-LABEL: Tail
+;CHECK: %p = phi i32 [ 1, %Tail.predBB1.split ], [ 2, %Tail.predBB2.split ]
+;CHECK: %[[MERGED:.*]] = phi i32 [ %[[CALL1]], %Tail.predBB1.split ], [ %[[CALL2]], %Tail.predBB2.split ]
+;CHECK: ret i32 %[[MERGED]]
+define i32 @test_ne_ne_untaken(i32* %a, i32 %v) {
+Header:
+  %tobool1 = icmp ne i32* %a, null
+  br i1 %tobool1, label %TBB, label %Tail
+
+TBB:
+  %cmp = icmp ne i32 %v, 1
+  br i1 %cmp, label %End, label %Tail
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_nonconst_const_phi
+;CHECK-LABEL: Tail.predBB1.split:
+;CHECK: %[[CALL1:.*]] = call i32 @callee(i32* %a, i32 %v, i32 1)
+;CHECK-LABEL: Tail.predBB2.split:
+;CHECK: %[[CALL2:.*]] = call i32 @callee(i32* %a, i32 1, i32 2)
+;CHECK-LABEL: Tail
+;CHECK: %p = phi i32 [ 1, %Tail.predBB1.split ], [ 2, %Tail.predBB2.split ]
+;CHECK: %[[MERGED:.*]] = phi i32 [ %[[CALL1]], %Tail.predBB1.split ], [ %[[CALL2]], %Tail.predBB2.split ]
+;CHECK: ret i32 %[[MERGED]]
+define i32 @test_nonconst_const_phi(i32* %a, i32* %b, i32 %v) {
+Header:
+  %tobool1 = icmp eq i32* %a, %b
+  br i1 %tobool1, label %Tail, label %TBB
+
+TBB:
+  %cmp = icmp eq i32 %v, 1
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_nonconst_nonconst_phi
+;CHECK-LABEL: Tail.predBB1.split:
+;CHECK: %[[CALL1:.*]] = call i32 @callee(i32* %a, i32 %v, i32 1)
+;CHECK-LABEL: Tail.predBB2.split:
+;CHECK: %[[CALL2:.*]] = call i32 @callee(i32* %a, i32 %v, i32 2)
+;CHECK-LABEL: Tail
+;CHECK: %p = phi i32 [ 1, %Tail.predBB1.split ], [ 2, %Tail.predBB2.split ]
+;CHECK: %[[MERGED:.*]] = phi i32 [ %[[CALL1]], %Tail.predBB1.split ], [ %[[CALL2]], %Tail.predBB2.split ]
+;CHECK: ret i32 %[[MERGED]]
+define i32 @test_nonconst_nonconst_phi(i32* %a, i32* %b, i32 %v, i32 %v2) {
+Header:
+  %tobool1 = icmp eq i32* %a, %b
+  br i1 %tobool1, label %Tail, label %TBB
+
+TBB:
+  %cmp = icmp eq i32 %v, %v2 
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_nonconst_nonconst_phi_noncost
+;CHECK-NOT: Tail.predBB1.split:
+;CHECK-NOT: Tail.predBB2.split:
+;CHECK-LABEL: Tail:
+;CHECK: %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+;CHECK: ret i32 %r
+define i32 @test_nonconst_nonconst_phi_noncost(i32* %a, i32* %b, i32 %v, i32 %v2) {
+Header:
+  %tobool1 = icmp eq i32* %a, %b
+  br i1 %tobool1, label %Tail, label %TBB
+
+TBB:
+  %cmp = icmp eq i32 %v, %v2 
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[%v,%Header], [%v2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_fisrtnonphi
+;CHECK-NOT: Tail.predBB1.split:
+;CHECK-NOT: Tail.predBB2.split:
+;CHECK-LABEL: Tail:
+;CHECK: %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+;CHECK: ret i32 %r
+define i32 @test_fisrtnonphi(i32* %a, i32 %v) {
+Header:
+  %tobool1 = icmp eq i32* %a, null
+  br i1 %tobool1, label %Tail, label %TBB
+
+TBB:
+  %cmp = icmp eq i32 %v, 1
+  br i1 %cmp, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  store i32 %v, i32* %a
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_3preds_constphi
+;CHECK-NOT: Tail.predBB1.split:
+;CHECK-NOT: Tail.predBB2.split:
+;CHECK-LABEL: Tail:
+;CHECK: %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+;CHECK: ret i32 %r
+define i32 @test_3preds_constphi(i32* %a, i32 %v, i1 %c1, i1 %c2, i1 %c3) {
+Header:
+  br i1 %c1, label %Tail, label %TBB1
+
+TBB1:
+  br i1 %c2, label %Tail, label %TBB2
+
+TBB2:
+  br i1 %c3, label %Tail, label %End
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB1], [3, %TBB2]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+;CHECK-LABEL: @test_indirectbr_phi
+;CHECK-NOT: Tail.predBB1.split:
+;CHECK-NOT: Tail.predBB2.split:
+;CHECK-LABEL: Tail:
+;CHECK: %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+;CHECK: ret i32 %r
+define i32 @test_indirectbr_phi(i8* %address, i32* %a, i32* %b, i32 %v) {
+Header:
+   %indirect.goto.dest = select i1 undef, i8* blockaddress(@test_indirectbr_phi, %End), i8* %address
+   indirectbr i8* %indirect.goto.dest, [label %TBB, label %Tail]
+
+TBB:
+  %indirect.goto.dest2 = select i1 undef, i8* blockaddress(@test_indirectbr_phi, %End), i8* %address
+  indirectbr i8* %indirect.goto.dest2, [label %Tail, label %End]
+
+Tail:
+  %p = phi i32[1,%Header], [2, %TBB]
+  %r = call i32 @callee(i32* %a, i32 %v, i32 %p)
+  ret i32 %r
+
+End:
+  ret i32 %v
+}
+
+define i32 @callee(i32* %a, i32 %v, i32 %p) {
+entry:
+  %c = icmp ne i32* %a, null
+  br i1 %c, label %BB1, label %BB2
+
+BB1:
+  call void @dummy(i32* %a, i32 %p)
+  br label %End
+
+BB2:
+  call void @dummy2(i32 %v, i32 %p)
+  br label %End
+
+End:
+  ret i32 %p
+}
+
+declare void @dummy(i32*, i32)
+declare void @dummy2(i32, i32)
Index: test/Transforms/CallSiteSplitting/callsite-split.ll
===================================================================
--- /dev/null
+++ test/Transforms/CallSiteSplitting/callsite-split.ll
@@ -0,0 +1,119 @@
+; RUN: opt < %s -callsite-splitting -inline -instcombine -jump-threading -S | FileCheck %s
+; RUN: opt < %s  -passes='function(callsite-splitting),cgscc(inline),function(instcombine,jump-threading)' -S | FileCheck %s
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-linaro-linux-gnueabi"
+
+%struct.bitmap = type { i32, %struct.bitmap* }
+
+;CHECK-LABEL: @caller
+;CHECK-LABEL: NextCond:
+;CHECK: br {{.*}} label %callee.exit
+;CHECK-LABEL: CallSiteBB.predBB1.split:
+;CHECK: call void @callee(%struct.bitmap* null, %struct.bitmap* null, %struct.bitmap* %b_elt, i1 false)
+;CHECK-LABEL: callee.exit:
+;CHECK: call void @dummy2(%struct.bitmap* %a_elt)
+
+define void @caller(i1 %c, %struct.bitmap* %a_elt, %struct.bitmap* %b_elt) {
+entry:
+  br label %Top
+
+Top:
+  %tobool1 = icmp eq %struct.bitmap* %a_elt, null
+  br i1 %tobool1, label %CallSiteBB, label %NextCond
+
+NextCond:
+  %cmp = icmp ne %struct.bitmap* %b_elt, null
+  br i1 %cmp, label %CallSiteBB, label %End
+
+CallSiteBB:
+  %p = phi i1 [0, %Top], [%c, %NextCond]
+  call void @callee(%struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %b_elt, i1 %p)
+  br label %End
+
+End:
+  ret void
+}
+
+define void @callee(%struct.bitmap* %dst_elt, %struct.bitmap* %a_elt, %struct.bitmap* %b_elt, i1 %c) {
+entry:
+  %tobool = icmp ne %struct.bitmap* %a_elt, null
+  %tobool1 = icmp ne %struct.bitmap* %b_elt, null
+  %or.cond = and i1 %tobool, %tobool1
+  br i1 %or.cond, label %Cond, label %Big
+
+Cond:
+  %cmp = icmp eq %struct.bitmap*  %dst_elt, %a_elt
+  br i1 %cmp, label %Small, label %Big
+
+Small:
+  call void @dummy2(%struct.bitmap* %a_elt)
+  br label %End
+
+Big:
+  call void @dummy1(%struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt)
+  call void @dummy1(%struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt)
+  call void @dummy1(%struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt)
+  call void @dummy1(%struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt)
+  call void @dummy1(%struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt)
+  call void @dummy1(%struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt)
+  call void @dummy1(%struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt, %struct.bitmap* %a_elt)
+  br label %End
+
+End:
+  ret void
+}
+
+declare void @dummy2(%struct.bitmap*)
+declare void @dummy1(%struct.bitmap*, %struct.bitmap*, %struct.bitmap*, %struct.bitmap*, %struct.bitmap*, %struct.bitmap*)
+
+
+;CHECK-LABEL: @caller2
+;CHECK-LABEL: CallSiteBB.predBB1.split:
+;CHECK: call void @dummy4()
+;CHECK-LABEL: CallSiteBB.predBB2.split:
+;CHECK: call void @dummy3()
+;CheCK-LABEL: CallSiteBB:
+;CHECK: %phi.call = phi i1 [ false, %CallSiteBB.predBB1.split ], [ true, %CallSiteBB.predBB2.split ]
+;CHECK: call void @foo(i1 %phi.call)
+define void @caller2(i1 %c, %struct.bitmap* %a_elt, %struct.bitmap* %b_elt, %struct.bitmap* %c_elt) {
+entry:
+  br label %Top
+
+Top:
+  %tobool1 = icmp eq %struct.bitmap* %a_elt, %b_elt
+  br i1 %tobool1, label %CallSiteBB, label %NextCond
+
+NextCond:
+  %cmp = icmp ne %struct.bitmap* %b_elt, %c_elt
+  br i1 %cmp, label %CallSiteBB, label %End
+
+CallSiteBB:
+  %phi = phi i1 [0, %Top],[1, %NextCond]
+  %u = call i1 @callee2(i1 %phi)
+  call void @foo(i1 %u)
+  br label %End
+
+End:
+  ret void
+}
+
+define i1 @callee2(i1 %b) {
+entry:
+  br i1 %b, label %BB1, label %BB2
+
+BB1:
+  call void @dummy3()
+  br label %End
+
+BB2:
+  call void @dummy4()
+  br label %End
+
+End:
+  ret i1 %b
+}
+
+declare void @dummy3()
+declare void @dummy4()
+declare void @foo(i1)