1 files changed, 0 insertions, 948 deletions

diff --git a/contrib/llvm/lib/Transforms/Utils/FunctionComparator.cpp b/contrib/llvm/lib/Transforms/Utils/FunctionComparator.cpp
deleted file mode 100644
index a9b28754c8e9..000000000000
--- a/contrib/llvm/lib/Transforms/Utils/FunctionComparator.cpp
+++ /dev/null
@@ -1,948 +0,0 @@
-//===- FunctionComparator.h - Function Comparator -------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the FunctionComparator and GlobalNumberState classes
-// which are used by the MergeFunctions pass for comparing functions.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/Utils/FunctionComparator.h"
-#include "llvm/ADT/APFloat.h"
-#include "llvm/ADT/APInt.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/Hashing.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/IR/Attributes.h"
-#include "llvm/IR/BasicBlock.h"
-#include "llvm/IR/CallSite.h"
-#include "llvm/IR/Constant.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/GlobalValue.h"
-#include "llvm/IR/InlineAsm.h"
-#include "llvm/IR/InstrTypes.h"
-#include "llvm/IR/Instruction.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Metadata.h"
-#include "llvm/IR/Module.h"
-#include "llvm/IR/Operator.h"
-#include "llvm/IR/Type.h"
-#include "llvm/IR/Value.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/Compiler.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_ostream.h"
-#include <cassert>
-#include <cstddef>
-#include <cstdint>
-#include <utility>
-
-using namespace llvm;
-
-#define DEBUG_TYPE "functioncomparator"
-
-int FunctionComparator::cmpNumbers(uint64_t L, uint64_t R) const {
-  if (L < R) return -1;
-  if (L > R) return 1;
-  return 0;
-}
-
-int FunctionComparator::cmpOrderings(AtomicOrdering L, AtomicOrdering R) const {
-  if ((int)L < (int)R) return -1;
-  if ((int)L > (int)R) return 1;
-  return 0;
-}
-
-int FunctionComparator::cmpAPInts(const APInt &L, const APInt &R) const {
-  if (int Res = cmpNumbers(L.getBitWidth(), R.getBitWidth()))
-    return Res;
-  if (L.ugt(R)) return 1;
-  if (R.ugt(L)) return -1;
-  return 0;
-}
-
-int FunctionComparator::cmpAPFloats(const APFloat &L, const APFloat &R) const {
-  // Floats are ordered first by semantics (i.e. float, double, half, etc.),
-  // then by value interpreted as a bitstring (aka APInt).
-  const fltSemantics &SL = L.getSemantics(), &SR = R.getSemantics();
-  if (int Res = cmpNumbers(APFloat::semanticsPrecision(SL),
-                           APFloat::semanticsPrecision(SR)))
-    return Res;
-  if (int Res = cmpNumbers(APFloat::semanticsMaxExponent(SL),
-                           APFloat::semanticsMaxExponent(SR)))
-    return Res;
-  if (int Res = cmpNumbers(APFloat::semanticsMinExponent(SL),
-                           APFloat::semanticsMinExponent(SR)))
-    return Res;
-  if (int Res = cmpNumbers(APFloat::semanticsSizeInBits(SL),
-                           APFloat::semanticsSizeInBits(SR)))
-    return Res;
-  return cmpAPInts(L.bitcastToAPInt(), R.bitcastToAPInt());
-}
-
-int FunctionComparator::cmpMem(StringRef L, StringRef R) const {
-  // Prevent heavy comparison, compare sizes first.
-  if (int Res = cmpNumbers(L.size(), R.size()))
-    return Res;
-
-  // Compare strings lexicographically only when it is necessary: only when
-  // strings are equal in size.
-  return L.compare(R);
-}
-
-int FunctionComparator::cmpAttrs(const AttributeList L,
-                                 const AttributeList R) const {
-  if (int Res = cmpNumbers(L.getNumAttrSets(), R.getNumAttrSets()))
-    return Res;
-
-  for (unsigned i = L.index_begin(), e = L.index_end(); i != e; ++i) {
-    AttributeSet LAS = L.getAttributes(i);
-    AttributeSet RAS = R.getAttributes(i);
-    AttributeSet::iterator LI = LAS.begin(), LE = LAS.end();
-    AttributeSet::iterator RI = RAS.begin(), RE = RAS.end();
-    for (; LI != LE && RI != RE; ++LI, ++RI) {
-      Attribute LA = *LI;
-      Attribute RA = *RI;
-      if (LA.isTypeAttribute() && RA.isTypeAttribute()) {
-        if (LA.getKindAsEnum() != RA.getKindAsEnum())
-          return cmpNumbers(LA.getKindAsEnum(), RA.getKindAsEnum());
-
-        Type *TyL = LA.getValueAsType();
-        Type *TyR = RA.getValueAsType();
-        if (TyL && TyR)
-          return cmpTypes(TyL, TyR);
-
-        // Two pointers, at least one null, so the comparison result is
-        // independent of the value of a real pointer.
-        return cmpNumbers((uint64_t)TyL, (uint64_t)TyR);
-      }
-      if (LA < RA)
-        return -1;
-      if (RA < LA)
-        return 1;
-    }
-    if (LI != LE)
-      return 1;
-    if (RI != RE)
-      return -1;
-  }
-  return 0;
-}
-
-int FunctionComparator::cmpRangeMetadata(const MDNode *L,
-                                         const MDNode *R) const {
-  if (L == R)
-    return 0;
-  if (!L)
-    return -1;
-  if (!R)
-    return 1;
-  // Range metadata is a sequence of numbers. Make sure they are the same
-  // sequence.
-  // TODO: Note that as this is metadata, it is possible to drop and/or merge
-  // this data when considering functions to merge. Thus this comparison would
-  // return 0 (i.e. equivalent), but merging would become more complicated
-  // because the ranges would need to be unioned. It is not likely that
-  // functions differ ONLY in this metadata if they are actually the same
-  // function semantically.
-  if (int Res = cmpNumbers(L->getNumOperands(), R->getNumOperands()))
-    return Res;
-  for (size_t I = 0; I < L->getNumOperands(); ++I) {
-    ConstantInt *LLow = mdconst::extract<ConstantInt>(L->getOperand(I));
-    ConstantInt *RLow = mdconst::extract<ConstantInt>(R->getOperand(I));
-    if (int Res = cmpAPInts(LLow->getValue(), RLow->getValue()))
-      return Res;
-  }
-  return 0;
-}
-
-int FunctionComparator::cmpOperandBundlesSchema(const Instruction *L,
-                                                const Instruction *R) const {
-  ImmutableCallSite LCS(L);
-  ImmutableCallSite RCS(R);
-
-  assert(LCS && RCS && "Must be calls or invokes!");
-  assert(LCS.isCall() == RCS.isCall() && "Can't compare otherwise!");
-
-  if (int Res =
-          cmpNumbers(LCS.getNumOperandBundles(), RCS.getNumOperandBundles()))
-    return Res;
-
-  for (unsigned i = 0, e = LCS.getNumOperandBundles(); i != e; ++i) {
-    auto OBL = LCS.getOperandBundleAt(i);
-    auto OBR = RCS.getOperandBundleAt(i);
-
-    if (int Res = OBL.getTagName().compare(OBR.getTagName()))
-      return Res;
-
-    if (int Res = cmpNumbers(OBL.Inputs.size(), OBR.Inputs.size()))
-      return Res;
-  }
-
-  return 0;
-}
-
-/// Constants comparison:
-/// 1. Check whether type of L constant could be losslessly bitcasted to R
-/// type.
-/// 2. Compare constant contents.
-/// For more details see declaration comments.
-int FunctionComparator::cmpConstants(const Constant *L,
-                                     const Constant *R) const {
-  Type *TyL = L->getType();
-  Type *TyR = R->getType();
-
-  // Check whether types are bitcastable. This part is just re-factored
-  // Type::canLosslesslyBitCastTo method, but instead of returning true/false,
-  // we also pack into result which type is "less" for us.
-  int TypesRes = cmpTypes(TyL, TyR);
-  if (TypesRes != 0) {
-    // Types are different, but check whether we can bitcast them.
-    if (!TyL->isFirstClassType()) {
-      if (TyR->isFirstClassType())
-        return -1;
-      // Neither TyL nor TyR are values of first class type. Return the result
-      // of comparing the types
-      return TypesRes;
-    }
-    if (!TyR->isFirstClassType()) {
-      if (TyL->isFirstClassType())
-        return 1;
-      return TypesRes;
-    }
-
-    // Vector -> Vector conversions are always lossless if the two vector types
-    // have the same size, otherwise not.
-    unsigned TyLWidth = 0;
-    unsigned TyRWidth = 0;
-
-    if (auto *VecTyL = dyn_cast<VectorType>(TyL))
-      TyLWidth = VecTyL->getBitWidth();
-    if (auto *VecTyR = dyn_cast<VectorType>(TyR))
-      TyRWidth = VecTyR->getBitWidth();
-
-    if (TyLWidth != TyRWidth)
-      return cmpNumbers(TyLWidth, TyRWidth);
-
-    // Zero bit-width means neither TyL nor TyR are vectors.
-    if (!TyLWidth) {
-      PointerType *PTyL = dyn_cast<PointerType>(TyL);
-      PointerType *PTyR = dyn_cast<PointerType>(TyR);
-      if (PTyL && PTyR) {
-        unsigned AddrSpaceL = PTyL->getAddressSpace();
-        unsigned AddrSpaceR = PTyR->getAddressSpace();
-        if (int Res = cmpNumbers(AddrSpaceL, AddrSpaceR))
-          return Res;
-      }
-      if (PTyL)
-        return 1;
-      if (PTyR)
-        return -1;
-
-      // TyL and TyR aren't vectors, nor pointers. We don't know how to
-      // bitcast them.
-      return TypesRes;
-    }
-  }
-
-  // OK, types are bitcastable, now check constant contents.
-
-  if (L->isNullValue() && R->isNullValue())
-    return TypesRes;
-  if (L->isNullValue() && !R->isNullValue())
-    return 1;
-  if (!L->isNullValue() && R->isNullValue())
-    return -1;
-
-  auto GlobalValueL = const_cast<GlobalValue *>(dyn_cast<GlobalValue>(L));
-  auto GlobalValueR = const_cast<GlobalValue *>(dyn_cast<GlobalValue>(R));
-  if (GlobalValueL && GlobalValueR) {
-    return cmpGlobalValues(GlobalValueL, GlobalValueR);
-  }
-
-  if (int Res = cmpNumbers(L->getValueID(), R->getValueID()))
-    return Res;
-
-  if (const auto *SeqL = dyn_cast<ConstantDataSequential>(L)) {
-    const auto *SeqR = cast<ConstantDataSequential>(R);
-    // This handles ConstantDataArray and ConstantDataVector. Note that we
-    // compare the two raw data arrays, which might differ depending on the host
-    // endianness. This isn't a problem though, because the endiness of a module
-    // will affect the order of the constants, but this order is the same
-    // for a given input module and host platform.
-    return cmpMem(SeqL->getRawDataValues(), SeqR->getRawDataValues());
-  }
-
-  switch (L->getValueID()) {
-  case Value::UndefValueVal:
-  case Value::ConstantTokenNoneVal:
-    return TypesRes;
-  case Value::ConstantIntVal: {
-    const APInt &LInt = cast<ConstantInt>(L)->getValue();
-    const APInt &RInt = cast<ConstantInt>(R)->getValue();
-    return cmpAPInts(LInt, RInt);
-  }
-  case Value::ConstantFPVal: {
-    const APFloat &LAPF = cast<ConstantFP>(L)->getValueAPF();
-    const APFloat &RAPF = cast<ConstantFP>(R)->getValueAPF();
-    return cmpAPFloats(LAPF, RAPF);
-  }
-  case Value::ConstantArrayVal: {
-    const ConstantArray *LA = cast<ConstantArray>(L);
-    const ConstantArray *RA = cast<ConstantArray>(R);
-    uint64_t NumElementsL = cast<ArrayType>(TyL)->getNumElements();
-    uint64_t NumElementsR = cast<ArrayType>(TyR)->getNumElements();
-    if (int Res = cmpNumbers(NumElementsL, NumElementsR))
-      return Res;
-    for (uint64_t i = 0; i < NumElementsL; ++i) {
-      if (int Res = cmpConstants(cast<Constant>(LA->getOperand(i)),
-                                 cast<Constant>(RA->getOperand(i))))
-        return Res;
-    }
-    return 0;
-  }
-  case Value::ConstantStructVal: {
-    const ConstantStruct *LS = cast<ConstantStruct>(L);
-    const ConstantStruct *RS = cast<ConstantStruct>(R);
-    unsigned NumElementsL = cast<StructType>(TyL)->getNumElements();
-    unsigned NumElementsR = cast<StructType>(TyR)->getNumElements();
-    if (int Res = cmpNumbers(NumElementsL, NumElementsR))
-      return Res;
-    for (unsigned i = 0; i != NumElementsL; ++i) {
-      if (int Res = cmpConstants(cast<Constant>(LS->getOperand(i)),
-                                 cast<Constant>(RS->getOperand(i))))
-        return Res;
-    }
-    return 0;
-  }
-  case Value::ConstantVectorVal: {
-    const ConstantVector *LV = cast<ConstantVector>(L);
-    const ConstantVector *RV = cast<ConstantVector>(R);
-    unsigned NumElementsL = cast<VectorType>(TyL)->getNumElements();
-    unsigned NumElementsR = cast<VectorType>(TyR)->getNumElements();
-    if (int Res = cmpNumbers(NumElementsL, NumElementsR))
-      return Res;
-    for (uint64_t i = 0; i < NumElementsL; ++i) {
-      if (int Res = cmpConstants(cast<Constant>(LV->getOperand(i)),
-                                 cast<Constant>(RV->getOperand(i))))
-        return Res;
-    }
-    return 0;
-  }
-  case Value::ConstantExprVal: {
-    const ConstantExpr *LE = cast<ConstantExpr>(L);
-    const ConstantExpr *RE = cast<ConstantExpr>(R);
-    unsigned NumOperandsL = LE->getNumOperands();
-    unsigned NumOperandsR = RE->getNumOperands();
-    if (int Res = cmpNumbers(NumOperandsL, NumOperandsR))
-      return Res;
-    for (unsigned i = 0; i < NumOperandsL; ++i) {
-      if (int Res = cmpConstants(cast<Constant>(LE->getOperand(i)),
-                                 cast<Constant>(RE->getOperand(i))))
-        return Res;
-    }
-    return 0;
-  }
-  case Value::BlockAddressVal: {
-    const BlockAddress *LBA = cast<BlockAddress>(L);
-    const BlockAddress *RBA = cast<BlockAddress>(R);
-    if (int Res = cmpValues(LBA->getFunction(), RBA->getFunction()))
-      return Res;
-    if (LBA->getFunction() == RBA->getFunction()) {
-      // They are BBs in the same function. Order by which comes first in the
-      // BB order of the function. This order is deterministic.
-      Function* F = LBA->getFunction();
-      BasicBlock *LBB = LBA->getBasicBlock();
-      BasicBlock *RBB = RBA->getBasicBlock();
-      if (LBB == RBB)
-        return 0;
-      for(BasicBlock &BB : F->getBasicBlockList()) {
-        if (&BB == LBB) {
-          assert(&BB != RBB);
-          return -1;
-        }
-        if (&BB == RBB)
-          return 1;
-      }
-      llvm_unreachable("Basic Block Address does not point to a basic block in "
-                       "its function.");
-      return -1;
-    } else {
-      // cmpValues said the functions are the same. So because they aren't
-      // literally the same pointer, they must respectively be the left and
-      // right functions.
-      assert(LBA->getFunction() == FnL && RBA->getFunction() == FnR);
-      // cmpValues will tell us if these are equivalent BasicBlocks, in the
-      // context of their respective functions.
-      return cmpValues(LBA->getBasicBlock(), RBA->getBasicBlock());
-    }
-  }
-  default: // Unknown constant, abort.
-    LLVM_DEBUG(dbgs() << "Looking at valueID " << L->getValueID() << "\n");
-    llvm_unreachable("Constant ValueID not recognized.");
-    return -1;
-  }
-}
-
-int FunctionComparator::cmpGlobalValues(GlobalValue *L, GlobalValue *R) const {
-  uint64_t LNumber = GlobalNumbers->getNumber(L);
-  uint64_t RNumber = GlobalNumbers->getNumber(R);
-  return cmpNumbers(LNumber, RNumber);
-}
-
-/// cmpType - compares two types,
-/// defines total ordering among the types set.
-/// See method declaration comments for more details.
-int FunctionComparator::cmpTypes(Type *TyL, Type *TyR) const {
-  PointerType *PTyL = dyn_cast<PointerType>(TyL);
-  PointerType *PTyR = dyn_cast<PointerType>(TyR);
-
-  const DataLayout &DL = FnL->getParent()->getDataLayout();
-  if (PTyL && PTyL->getAddressSpace() == 0)
-    TyL = DL.getIntPtrType(TyL);
-  if (PTyR && PTyR->getAddressSpace() == 0)
-    TyR = DL.getIntPtrType(TyR);
-
-  if (TyL == TyR)
-    return 0;
-
-  if (int Res = cmpNumbers(TyL->getTypeID(), TyR->getTypeID()))
-    return Res;
-
-  switch (TyL->getTypeID()) {
-  default:
-    llvm_unreachable("Unknown type!");
-  case Type::IntegerTyID:
-    return cmpNumbers(cast<IntegerType>(TyL)->getBitWidth(),
-                      cast<IntegerType>(TyR)->getBitWidth());
-  // TyL == TyR would have returned true earlier, because types are uniqued.
-  case Type::VoidTyID:
-  case Type::FloatTyID:
-  case Type::DoubleTyID:
-  case Type::X86_FP80TyID:
-  case Type::FP128TyID:
-  case Type::PPC_FP128TyID:
-  case Type::LabelTyID:
-  case Type::MetadataTyID:
-  case Type::TokenTyID:
-    return 0;
-
-  case Type::PointerTyID:
-    assert(PTyL && PTyR && "Both types must be pointers here.");
-    return cmpNumbers(PTyL->getAddressSpace(), PTyR->getAddressSpace());
-
-  case Type::StructTyID: {
-    StructType *STyL = cast<StructType>(TyL);
-    StructType *STyR = cast<StructType>(TyR);
-    if (STyL->getNumElements() != STyR->getNumElements())
-      return cmpNumbers(STyL->getNumElements(), STyR->getNumElements());
-
-    if (STyL->isPacked() != STyR->isPacked())
-      return cmpNumbers(STyL->isPacked(), STyR->isPacked());
-
-    for (unsigned i = 0, e = STyL->getNumElements(); i != e; ++i) {
-      if (int Res = cmpTypes(STyL->getElementType(i), STyR->getElementType(i)))
-        return Res;
-    }
-    return 0;
-  }
-
-  case Type::FunctionTyID: {
-    FunctionType *FTyL = cast<FunctionType>(TyL);
-    FunctionType *FTyR = cast<FunctionType>(TyR);
-    if (FTyL->getNumParams() != FTyR->getNumParams())
-      return cmpNumbers(FTyL->getNumParams(), FTyR->getNumParams());
-
-    if (FTyL->isVarArg() != FTyR->isVarArg())
-      return cmpNumbers(FTyL->isVarArg(), FTyR->isVarArg());
-
-    if (int Res = cmpTypes(FTyL->getReturnType(), FTyR->getReturnType()))
-      return Res;
-
-    for (unsigned i = 0, e = FTyL->getNumParams(); i != e; ++i) {
-      if (int Res = cmpTypes(FTyL->getParamType(i), FTyR->getParamType(i)))
-        return Res;
-    }
-    return 0;
-  }
-
-  case Type::ArrayTyID:
-  case Type::VectorTyID: {
-    auto *STyL = cast<SequentialType>(TyL);
-    auto *STyR = cast<SequentialType>(TyR);
-    if (STyL->getNumElements() != STyR->getNumElements())
-      return cmpNumbers(STyL->getNumElements(), STyR->getNumElements());
-    return cmpTypes(STyL->getElementType(), STyR->getElementType());
-  }
-  }
-}
-
-// Determine whether the two operations are the same except that pointer-to-A
-// and pointer-to-B are equivalent. This should be kept in sync with
-// Instruction::isSameOperationAs.
-// Read method declaration comments for more details.
-int FunctionComparator::cmpOperations(const Instruction *L,
-                                      const Instruction *R,
-                                      bool &needToCmpOperands) const {
-  needToCmpOperands = true;
-  if (int Res = cmpValues(L, R))
-    return Res;
-
-  // Differences from Instruction::isSameOperationAs:
-  //  * replace type comparison with calls to cmpTypes.
-  //  * we test for I->getRawSubclassOptionalData (nuw/nsw/tail) at the top.
-  //  * because of the above, we don't test for the tail bit on calls later on.
-  if (int Res = cmpNumbers(L->getOpcode(), R->getOpcode()))
-    return Res;
-
-  if (const GetElementPtrInst *GEPL = dyn_cast<GetElementPtrInst>(L)) {
-    needToCmpOperands = false;
-    const GetElementPtrInst *GEPR = cast<GetElementPtrInst>(R);
-    if (int Res =
-            cmpValues(GEPL->getPointerOperand(), GEPR->getPointerOperand()))
-      return Res;
-    return cmpGEPs(GEPL, GEPR);
-  }
-
-  if (int Res = cmpNumbers(L->getNumOperands(), R->getNumOperands()))
-    return Res;
-
-  if (int Res = cmpTypes(L->getType(), R->getType()))
-    return Res;
-
-  if (int Res = cmpNumbers(L->getRawSubclassOptionalData(),
-                           R->getRawSubclassOptionalData()))
-    return Res;
-
-  // We have two instructions of identical opcode and #operands.  Check to see
-  // if all operands are the same type
-  for (unsigned i = 0, e = L->getNumOperands(); i != e; ++i) {
-    if (int Res =
-            cmpTypes(L->getOperand(i)->getType(), R->getOperand(i)->getType()))
-      return Res;
-  }
-
-  // Check special state that is a part of some instructions.
-  if (const AllocaInst *AI = dyn_cast<AllocaInst>(L)) {
-    if (int Res = cmpTypes(AI->getAllocatedType(),
-                           cast<AllocaInst>(R)->getAllocatedType()))
-      return Res;
-    return cmpNumbers(AI->getAlignment(), cast<AllocaInst>(R)->getAlignment());
-  }
-  if (const LoadInst *LI = dyn_cast<LoadInst>(L)) {
-    if (int Res = cmpNumbers(LI->isVolatile(), cast<LoadInst>(R)->isVolatile()))
-      return Res;
-    if (int Res =
-            cmpNumbers(LI->getAlignment(), cast<LoadInst>(R)->getAlignment()))
-      return Res;
-    if (int Res =
-            cmpOrderings(LI->getOrdering(), cast<LoadInst>(R)->getOrdering()))
-      return Res;
-    if (int Res = cmpNumbers(LI->getSyncScopeID(),
-                             cast<LoadInst>(R)->getSyncScopeID()))
-      return Res;
-    return cmpRangeMetadata(LI->getMetadata(LLVMContext::MD_range),
-        cast<LoadInst>(R)->getMetadata(LLVMContext::MD_range));
-  }
-  if (const StoreInst *SI = dyn_cast<StoreInst>(L)) {
-    if (int Res =
-            cmpNumbers(SI->isVolatile(), cast<StoreInst>(R)->isVolatile()))
-      return Res;
-    if (int Res =
-            cmpNumbers(SI->getAlignment(), cast<StoreInst>(R)->getAlignment()))
-      return Res;
-    if (int Res =
-            cmpOrderings(SI->getOrdering(), cast<StoreInst>(R)->getOrdering()))
-      return Res;
-    return cmpNumbers(SI->getSyncScopeID(),
-                      cast<StoreInst>(R)->getSyncScopeID());
-  }
-  if (const CmpInst *CI = dyn_cast<CmpInst>(L))
-    return cmpNumbers(CI->getPredicate(), cast<CmpInst>(R)->getPredicate());
-  if (auto CSL = CallSite(const_cast<Instruction *>(L))) {
-    auto CSR = CallSite(const_cast<Instruction *>(R));
-    if (int Res = cmpNumbers(CSL.getCallingConv(), CSR.getCallingConv()))
-      return Res;
-    if (int Res = cmpAttrs(CSL.getAttributes(), CSR.getAttributes()))
-      return Res;
-    if (int Res = cmpOperandBundlesSchema(L, R))
-      return Res;
-    if (const CallInst *CI = dyn_cast<CallInst>(L))
-      if (int Res = cmpNumbers(CI->getTailCallKind(),
-                               cast<CallInst>(R)->getTailCallKind()))
-        return Res;
-    return cmpRangeMetadata(L->getMetadata(LLVMContext::MD_range),
-                            R->getMetadata(LLVMContext::MD_range));
-  }
-  if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(L)) {
-    ArrayRef<unsigned> LIndices = IVI->getIndices();
-    ArrayRef<unsigned> RIndices = cast<InsertValueInst>(R)->getIndices();
-    if (int Res = cmpNumbers(LIndices.size(), RIndices.size()))
-      return Res;
-    for (size_t i = 0, e = LIndices.size(); i != e; ++i) {
-      if (int Res = cmpNumbers(LIndices[i], RIndices[i]))
-        return Res;
-    }
-    return 0;
-  }
-  if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(L)) {
-    ArrayRef<unsigned> LIndices = EVI->getIndices();
-    ArrayRef<unsigned> RIndices = cast<ExtractValueInst>(R)->getIndices();
-    if (int Res = cmpNumbers(LIndices.size(), RIndices.size()))
-      return Res;
-    for (size_t i = 0, e = LIndices.size(); i != e; ++i) {
-      if (int Res = cmpNumbers(LIndices[i], RIndices[i]))
-        return Res;
-    }
-  }
-  if (const FenceInst *FI = dyn_cast<FenceInst>(L)) {
-    if (int Res =
-            cmpOrderings(FI->getOrdering(), cast<FenceInst>(R)->getOrdering()))
-      return Res;
-    return cmpNumbers(FI->getSyncScopeID(),
-                      cast<FenceInst>(R)->getSyncScopeID());
-  }
-  if (const AtomicCmpXchgInst *CXI = dyn_cast<AtomicCmpXchgInst>(L)) {
-    if (int Res = cmpNumbers(CXI->isVolatile(),
-                             cast<AtomicCmpXchgInst>(R)->isVolatile()))
-      return Res;
-    if (int Res = cmpNumbers(CXI->isWeak(),
-                             cast<AtomicCmpXchgInst>(R)->isWeak()))
-      return Res;
-    if (int Res =
-            cmpOrderings(CXI->getSuccessOrdering(),
-                         cast<AtomicCmpXchgInst>(R)->getSuccessOrdering()))
-      return Res;
-    if (int Res =
-            cmpOrderings(CXI->getFailureOrdering(),
-                         cast<AtomicCmpXchgInst>(R)->getFailureOrdering()))
-      return Res;
-    return cmpNumbers(CXI->getSyncScopeID(),
-                      cast<AtomicCmpXchgInst>(R)->getSyncScopeID());
-  }
-  if (const AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(L)) {
-    if (int Res = cmpNumbers(RMWI->getOperation(),
-                             cast<AtomicRMWInst>(R)->getOperation()))
-      return Res;
-    if (int Res = cmpNumbers(RMWI->isVolatile(),
-                             cast<AtomicRMWInst>(R)->isVolatile()))
-      return Res;
-    if (int Res = cmpOrderings(RMWI->getOrdering(),
-                             cast<AtomicRMWInst>(R)->getOrdering()))
-      return Res;
-    return cmpNumbers(RMWI->getSyncScopeID(),
-                      cast<AtomicRMWInst>(R)->getSyncScopeID());
-  }
-  if (const PHINode *PNL = dyn_cast<PHINode>(L)) {
-    const PHINode *PNR = cast<PHINode>(R);
-    // Ensure that in addition to the incoming values being identical
-    // (checked by the caller of this function), the incoming blocks
-    // are also identical.
-    for (unsigned i = 0, e = PNL->getNumIncomingValues(); i != e; ++i) {
-      if (int Res =
-              cmpValues(PNL->getIncomingBlock(i), PNR->getIncomingBlock(i)))
-        return Res;
-    }
-  }
-  return 0;
-}
-
-// Determine whether two GEP operations perform the same underlying arithmetic.
-// Read method declaration comments for more details.
-int FunctionComparator::cmpGEPs(const GEPOperator *GEPL,
-                                const GEPOperator *GEPR) const {
-  unsigned int ASL = GEPL->getPointerAddressSpace();
-  unsigned int ASR = GEPR->getPointerAddressSpace();
-
-  if (int Res = cmpNumbers(ASL, ASR))
-    return Res;
-
-  // When we have target data, we can reduce the GEP down to the value in bytes
-  // added to the address.
-  const DataLayout &DL = FnL->getParent()->getDataLayout();
-  unsigned BitWidth = DL.getPointerSizeInBits(ASL);
-  APInt OffsetL(BitWidth, 0), OffsetR(BitWidth, 0);
-  if (GEPL->accumulateConstantOffset(DL, OffsetL) &&
-      GEPR->accumulateConstantOffset(DL, OffsetR))
-    return cmpAPInts(OffsetL, OffsetR);
-  if (int Res = cmpTypes(GEPL->getSourceElementType(),
-                         GEPR->getSourceElementType()))
-    return Res;
-
-  if (int Res = cmpNumbers(GEPL->getNumOperands(), GEPR->getNumOperands()))
-    return Res;
-
-  for (unsigned i = 0, e = GEPL->getNumOperands(); i != e; ++i) {
-    if (int Res = cmpValues(GEPL->getOperand(i), GEPR->getOperand(i)))
-      return Res;
-  }
-
-  return 0;
-}
-
-int FunctionComparator::cmpInlineAsm(const InlineAsm *L,
-                                     const InlineAsm *R) const {
-  // InlineAsm's are uniqued. If they are the same pointer, obviously they are
-  // the same, otherwise compare the fields.
-  if (L == R)
-    return 0;
-  if (int Res = cmpTypes(L->getFunctionType(), R->getFunctionType()))
-    return Res;
-  if (int Res = cmpMem(L->getAsmString(), R->getAsmString()))
-    return Res;
-  if (int Res = cmpMem(L->getConstraintString(), R->getConstraintString()))
-    return Res;
-  if (int Res = cmpNumbers(L->hasSideEffects(), R->hasSideEffects()))
-    return Res;
-  if (int Res = cmpNumbers(L->isAlignStack(), R->isAlignStack()))
-    return Res;
-  if (int Res = cmpNumbers(L->getDialect(), R->getDialect()))
-    return Res;
-  assert(L->getFunctionType() != R->getFunctionType());
-  return 0;
-}
-
-/// Compare two values used by the two functions under pair-wise comparison. If
-/// this is the first time the values are seen, they're added to the mapping so
-/// that we will detect mismatches on next use.
-/// See comments in declaration for more details.
-int FunctionComparator::cmpValues(const Value *L, const Value *R) const {
-  // Catch self-reference case.
-  if (L == FnL) {
-    if (R == FnR)
-      return 0;
-    return -1;
-  }
-  if (R == FnR) {
-    if (L == FnL)
-      return 0;
-    return 1;
-  }
-
-  const Constant *ConstL = dyn_cast<Constant>(L);
-  const Constant *ConstR = dyn_cast<Constant>(R);
-  if (ConstL && ConstR) {
-    if (L == R)
-      return 0;
-    return cmpConstants(ConstL, ConstR);
-  }
-
-  if (ConstL)
-    return 1;
-  if (ConstR)
-    return -1;
-
-  const InlineAsm *InlineAsmL = dyn_cast<InlineAsm>(L);
-  const InlineAsm *InlineAsmR = dyn_cast<InlineAsm>(R);
-
-  if (InlineAsmL && InlineAsmR)
-    return cmpInlineAsm(InlineAsmL, InlineAsmR);
-  if (InlineAsmL)
-    return 1;
-  if (InlineAsmR)
-    return -1;
-
-  auto LeftSN = sn_mapL.insert(std::make_pair(L, sn_mapL.size())),
-       RightSN = sn_mapR.insert(std::make_pair(R, sn_mapR.size()));
-
-  return cmpNumbers(LeftSN.first->second, RightSN.first->second);
-}
-
-// Test whether two basic blocks have equivalent behaviour.
-int FunctionComparator::cmpBasicBlocks(const BasicBlock *BBL,
-                                       const BasicBlock *BBR) const {
-  BasicBlock::const_iterator InstL = BBL->begin(), InstLE = BBL->end();
-  BasicBlock::const_iterator InstR = BBR->begin(), InstRE = BBR->end();
-
-  do {
-    bool needToCmpOperands = true;
-    if (int Res = cmpOperations(&*InstL, &*InstR, needToCmpOperands))
-      return Res;
-    if (needToCmpOperands) {
-      assert(InstL->getNumOperands() == InstR->getNumOperands());
-
-      for (unsigned i = 0, e = InstL->getNumOperands(); i != e; ++i) {
-        Value *OpL = InstL->getOperand(i);
-        Value *OpR = InstR->getOperand(i);
-        if (int Res = cmpValues(OpL, OpR))
-          return Res;
-        // cmpValues should ensure this is true.
-        assert(cmpTypes(OpL->getType(), OpR->getType()) == 0);
-      }
-    }
-
-    ++InstL;
-    ++InstR;
-  } while (InstL != InstLE && InstR != InstRE);
-
-  if (InstL != InstLE && InstR == InstRE)
-    return 1;
-  if (InstL == InstLE && InstR != InstRE)
-    return -1;
-  return 0;
-}
-
-int FunctionComparator::compareSignature() const {
-  if (int Res = cmpAttrs(FnL->getAttributes(), FnR->getAttributes()))
-    return Res;
-
-  if (int Res = cmpNumbers(FnL->hasGC(), FnR->hasGC()))
-    return Res;
-
-  if (FnL->hasGC()) {
-    if (int Res = cmpMem(FnL->getGC(), FnR->getGC()))
-      return Res;
-  }
-
-  if (int Res = cmpNumbers(FnL->hasSection(), FnR->hasSection()))
-    return Res;
-
-  if (FnL->hasSection()) {
-    if (int Res = cmpMem(FnL->getSection(), FnR->getSection()))
-      return Res;
-  }
-
-  if (int Res = cmpNumbers(FnL->isVarArg(), FnR->isVarArg()))
-    return Res;
-
-  // TODO: if it's internal and only used in direct calls, we could handle this
-  // case too.
-  if (int Res = cmpNumbers(FnL->getCallingConv(), FnR->getCallingConv()))
-    return Res;
-
-  if (int Res = cmpTypes(FnL->getFunctionType(), FnR->getFunctionType()))
-    return Res;
-
-  assert(FnL->arg_size() == FnR->arg_size() &&
-         "Identically typed functions have different numbers of args!");
-
-  // Visit the arguments so that they get enumerated in the order they're
-  // passed in.
-  for (Function::const_arg_iterator ArgLI = FnL->arg_begin(),
-       ArgRI = FnR->arg_begin(),
-       ArgLE = FnL->arg_end();
-       ArgLI != ArgLE; ++ArgLI, ++ArgRI) {
-    if (cmpValues(&*ArgLI, &*ArgRI) != 0)
-      llvm_unreachable("Arguments repeat!");
-  }
-  return 0;
-}
-
-// Test whether the two functions have equivalent behaviour.
-int FunctionComparator::compare() {
-  beginCompare();
-
-  if (int Res = compareSignature())
-    return Res;
-
-  // We do a CFG-ordered walk since the actual ordering of the blocks in the
-  // linked list is immaterial. Our walk starts at the entry block for both
-  // functions, then takes each block from each terminator in order. As an
-  // artifact, this also means that unreachable blocks are ignored.
-  SmallVector<const BasicBlock *, 8> FnLBBs, FnRBBs;
-  SmallPtrSet<const BasicBlock *, 32> VisitedBBs; // in terms of F1.
-
-  FnLBBs.push_back(&FnL->getEntryBlock());
-  FnRBBs.push_back(&FnR->getEntryBlock());
-
-  VisitedBBs.insert(FnLBBs[0]);
-  while (!FnLBBs.empty()) {
-    const BasicBlock *BBL = FnLBBs.pop_back_val();
-    const BasicBlock *BBR = FnRBBs.pop_back_val();
-
-    if (int Res = cmpValues(BBL, BBR))
-      return Res;
-
-    if (int Res = cmpBasicBlocks(BBL, BBR))
-      return Res;
-
-    const Instruction *TermL = BBL->getTerminator();
-    const Instruction *TermR = BBR->getTerminator();
-
-    assert(TermL->getNumSuccessors() == TermR->getNumSuccessors());
-    for (unsigned i = 0, e = TermL->getNumSuccessors(); i != e; ++i) {
-      if (!VisitedBBs.insert(TermL->getSuccessor(i)).second)
-        continue;
-
-      FnLBBs.push_back(TermL->getSuccessor(i));
-      FnRBBs.push_back(TermR->getSuccessor(i));
-    }
-  }
-  return 0;
-}
-
-namespace {
-
-// Accumulate the hash of a sequence of 64-bit integers. This is similar to a
-// hash of a sequence of 64bit ints, but the entire input does not need to be
-// available at once. This interface is necessary for functionHash because it
-// needs to accumulate the hash as the structure of the function is traversed
-// without saving these values to an intermediate buffer. This form of hashing
-// is not often needed, as usually the object to hash is just read from a
-// buffer.
-class HashAccumulator64 {
-  uint64_t Hash;
-
-public:
-  // Initialize to random constant, so the state isn't zero.
-  HashAccumulator64() { Hash = 0x6acaa36bef8325c5ULL; }
-
-  void add(uint64_t V) {
-     Hash = hashing::detail::hash_16_bytes(Hash, V);
-  }
-
-  // No finishing is required, because the entire hash value is used.
-  uint64_t getHash() { return Hash; }
-};
-
-} // end anonymous namespace
-
-// A function hash is calculated by considering only the number of arguments and
-// whether a function is varargs, the order of basic blocks (given by the
-// successors of each basic block in depth first order), and the order of
-// opcodes of each instruction within each of these basic blocks. This mirrors
-// the strategy compare() uses to compare functions by walking the BBs in depth
-// first order and comparing each instruction in sequence. Because this hash
-// does not look at the operands, it is insensitive to things such as the
-// target of calls and the constants used in the function, which makes it useful
-// when possibly merging functions which are the same modulo constants and call
-// targets.
-FunctionComparator::FunctionHash FunctionComparator::functionHash(Function &F) {
-  HashAccumulator64 H;
-  H.add(F.isVarArg());
-  H.add(F.arg_size());
-
-  SmallVector<const BasicBlock *, 8> BBs;
-  SmallPtrSet<const BasicBlock *, 16> VisitedBBs;
-
-  // Walk the blocks in the same order as FunctionComparator::cmpBasicBlocks(),
-  // accumulating the hash of the function "structure." (BB and opcode sequence)
-  BBs.push_back(&F.getEntryBlock());
-  VisitedBBs.insert(BBs[0]);
-  while (!BBs.empty()) {
-    const BasicBlock *BB = BBs.pop_back_val();
-    // This random value acts as a block header, as otherwise the partition of
-    // opcodes into BBs wouldn't affect the hash, only the order of the opcodes
-    H.add(45798);
-    for (auto &Inst : *BB) {
-      H.add(Inst.getOpcode());
-    }
-    const Instruction *Term = BB->getTerminator();
-    for (unsigned i = 0, e = Term->getNumSuccessors(); i != e; ++i) {
-      if (!VisitedBBs.insert(Term->getSuccessor(i)).second)
-        continue;
-      BBs.push_back(Term->getSuccessor(i));
-    }
-  }
-  return H.getHash();
-}