1 files changed, 0 insertions, 2546 deletions

diff --git a/contrib/llvm/lib/Analysis/ConstantFolding.cpp b/contrib/llvm/lib/Analysis/ConstantFolding.cpp
deleted file mode 100644
index 20231ca78b45..000000000000
--- a/contrib/llvm/lib/Analysis/ConstantFolding.cpp
+++ /dev/null
@@ -1,2546 +0,0 @@
-//===-- ConstantFolding.cpp - Fold instructions into constants ------------===//
-//
-// 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 defines routines for folding instructions into constants.
-//
-// Also, to supplement the basic IR ConstantExpr simplifications,
-// this file defines some additional folding routines that can make use of
-// DataLayout information. These functions cannot go in IR due to library
-// dependency issues.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/ConstantFolding.h"
-#include "llvm/ADT/APFloat.h"
-#include "llvm/ADT/APInt.h"
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/Analysis/TargetLibraryInfo.h"
-#include "llvm/Analysis/ValueTracking.h"
-#include "llvm/Analysis/VectorUtils.h"
-#include "llvm/Config/config.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/GlobalVariable.h"
-#include "llvm/IR/InstrTypes.h"
-#include "llvm/IR/Instruction.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Operator.h"
-#include "llvm/IR/Type.h"
-#include "llvm/IR/Value.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/KnownBits.h"
-#include "llvm/Support/MathExtras.h"
-#include <cassert>
-#include <cerrno>
-#include <cfenv>
-#include <cmath>
-#include <cstddef>
-#include <cstdint>
-
-using namespace llvm;
-
-namespace {
-
-//===----------------------------------------------------------------------===//
-// Constant Folding internal helper functions
-//===----------------------------------------------------------------------===//
-
-static Constant *foldConstVectorToAPInt(APInt &Result, Type *DestTy,
-                                        Constant *C, Type *SrcEltTy,
-                                        unsigned NumSrcElts,
-                                        const DataLayout &DL) {
-  // Now that we know that the input value is a vector of integers, just shift
-  // and insert them into our result.
-  unsigned BitShift = DL.getTypeSizeInBits(SrcEltTy);
-  for (unsigned i = 0; i != NumSrcElts; ++i) {
-    Constant *Element;
-    if (DL.isLittleEndian())
-      Element = C->getAggregateElement(NumSrcElts - i - 1);
-    else
-      Element = C->getAggregateElement(i);
-
-    if (Element && isa<UndefValue>(Element)) {
-      Result <<= BitShift;
-      continue;
-    }
-
-    auto *ElementCI = dyn_cast_or_null<ConstantInt>(Element);
-    if (!ElementCI)
-      return ConstantExpr::getBitCast(C, DestTy);
-
-    Result <<= BitShift;
-    Result |= ElementCI->getValue().zextOrSelf(Result.getBitWidth());
-  }
-
-  return nullptr;
-}
-
-/// Constant fold bitcast, symbolically evaluating it with DataLayout.
-/// This always returns a non-null constant, but it may be a
-/// ConstantExpr if unfoldable.
-Constant *FoldBitCast(Constant *C, Type *DestTy, const DataLayout &DL) {
-  // Catch the obvious splat cases.
-  if (C->isNullValue() && !DestTy->isX86_MMXTy())
-    return Constant::getNullValue(DestTy);
-  if (C->isAllOnesValue() && !DestTy->isX86_MMXTy() &&
-      !DestTy->isPtrOrPtrVectorTy()) // Don't get ones for ptr types!
-    return Constant::getAllOnesValue(DestTy);
-
-  if (auto *VTy = dyn_cast<VectorType>(C->getType())) {
-    // Handle a vector->scalar integer/fp cast.
-    if (isa<IntegerType>(DestTy) || DestTy->isFloatingPointTy()) {
-      unsigned NumSrcElts = VTy->getNumElements();
-      Type *SrcEltTy = VTy->getElementType();
-
-      // If the vector is a vector of floating point, convert it to vector of int
-      // to simplify things.
-      if (SrcEltTy->isFloatingPointTy()) {
-        unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits();
-        Type *SrcIVTy =
-          VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElts);
-        // Ask IR to do the conversion now that #elts line up.
-        C = ConstantExpr::getBitCast(C, SrcIVTy);
-      }
-
-      APInt Result(DL.getTypeSizeInBits(DestTy), 0);
-      if (Constant *CE = foldConstVectorToAPInt(Result, DestTy, C,
-                                                SrcEltTy, NumSrcElts, DL))
-        return CE;
-
-      if (isa<IntegerType>(DestTy))
-        return ConstantInt::get(DestTy, Result);
-
-      APFloat FP(DestTy->getFltSemantics(), Result);
-      return ConstantFP::get(DestTy->getContext(), FP);
-    }
-  }
-
-  // The code below only handles casts to vectors currently.
-  auto *DestVTy = dyn_cast<VectorType>(DestTy);
-  if (!DestVTy)
-    return ConstantExpr::getBitCast(C, DestTy);
-
-  // If this is a scalar -> vector cast, convert the input into a <1 x scalar>
-  // vector so the code below can handle it uniformly.
-  if (isa<ConstantFP>(C) || isa<ConstantInt>(C)) {
-    Constant *Ops = C; // don't take the address of C!
-    return FoldBitCast(ConstantVector::get(Ops), DestTy, DL);
-  }
-
-  // If this is a bitcast from constant vector -> vector, fold it.
-  if (!isa<ConstantDataVector>(C) && !isa<ConstantVector>(C))
-    return ConstantExpr::getBitCast(C, DestTy);
-
-  // If the element types match, IR can fold it.
-  unsigned NumDstElt = DestVTy->getNumElements();
-  unsigned NumSrcElt = C->getType()->getVectorNumElements();
-  if (NumDstElt == NumSrcElt)
-    return ConstantExpr::getBitCast(C, DestTy);
-
-  Type *SrcEltTy = C->getType()->getVectorElementType();
-  Type *DstEltTy = DestVTy->getElementType();
-
-  // Otherwise, we're changing the number of elements in a vector, which
-  // requires endianness information to do the right thing.  For example,
-  //    bitcast (<2 x i64> <i64 0, i64 1> to <4 x i32>)
-  // folds to (little endian):
-  //    <4 x i32> <i32 0, i32 0, i32 1, i32 0>
-  // and to (big endian):
-  //    <4 x i32> <i32 0, i32 0, i32 0, i32 1>
-
-  // First thing is first.  We only want to think about integer here, so if
-  // we have something in FP form, recast it as integer.
-  if (DstEltTy->isFloatingPointTy()) {
-    // Fold to an vector of integers with same size as our FP type.
-    unsigned FPWidth = DstEltTy->getPrimitiveSizeInBits();
-    Type *DestIVTy =
-      VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumDstElt);
-    // Recursively handle this integer conversion, if possible.
-    C = FoldBitCast(C, DestIVTy, DL);
-
-    // Finally, IR can handle this now that #elts line up.
-    return ConstantExpr::getBitCast(C, DestTy);
-  }
-
-  // Okay, we know the destination is integer, if the input is FP, convert
-  // it to integer first.
-  if (SrcEltTy->isFloatingPointTy()) {
-    unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits();
-    Type *SrcIVTy =
-      VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElt);
-    // Ask IR to do the conversion now that #elts line up.
-    C = ConstantExpr::getBitCast(C, SrcIVTy);
-    // If IR wasn't able to fold it, bail out.
-    if (!isa<ConstantVector>(C) &&  // FIXME: Remove ConstantVector.
-        !isa<ConstantDataVector>(C))
-      return C;
-  }
-
-  // Now we know that the input and output vectors are both integer vectors
-  // of the same size, and that their #elements is not the same.  Do the
-  // conversion here, which depends on whether the input or output has
-  // more elements.
-  bool isLittleEndian = DL.isLittleEndian();
-
-  SmallVector<Constant*, 32> Result;
-  if (NumDstElt < NumSrcElt) {
-    // Handle: bitcast (<4 x i32> <i32 0, i32 1, i32 2, i32 3> to <2 x i64>)
-    Constant *Zero = Constant::getNullValue(DstEltTy);
-    unsigned Ratio = NumSrcElt/NumDstElt;
-    unsigned SrcBitSize = SrcEltTy->getPrimitiveSizeInBits();
-    unsigned SrcElt = 0;
-    for (unsigned i = 0; i != NumDstElt; ++i) {
-      // Build each element of the result.
-      Constant *Elt = Zero;
-      unsigned ShiftAmt = isLittleEndian ? 0 : SrcBitSize*(Ratio-1);
-      for (unsigned j = 0; j != Ratio; ++j) {
-        Constant *Src = C->getAggregateElement(SrcElt++);
-        if (Src && isa<UndefValue>(Src))
-          Src = Constant::getNullValue(C->getType()->getVectorElementType());
-        else
-          Src = dyn_cast_or_null<ConstantInt>(Src);
-        if (!Src)  // Reject constantexpr elements.
-          return ConstantExpr::getBitCast(C, DestTy);
-
-        // Zero extend the element to the right size.
-        Src = ConstantExpr::getZExt(Src, Elt->getType());
-
-        // Shift it to the right place, depending on endianness.
-        Src = ConstantExpr::getShl(Src,
-                                   ConstantInt::get(Src->getType(), ShiftAmt));
-        ShiftAmt += isLittleEndian ? SrcBitSize : -SrcBitSize;
-
-        // Mix it in.
-        Elt = ConstantExpr::getOr(Elt, Src);
-      }
-      Result.push_back(Elt);
-    }
-    return ConstantVector::get(Result);
-  }
-
-  // Handle: bitcast (<2 x i64> <i64 0, i64 1> to <4 x i32>)
-  unsigned Ratio = NumDstElt/NumSrcElt;
-  unsigned DstBitSize = DL.getTypeSizeInBits(DstEltTy);
-
-  // Loop over each source value, expanding into multiple results.
-  for (unsigned i = 0; i != NumSrcElt; ++i) {
-    auto *Element = C->getAggregateElement(i);
-
-    if (!Element) // Reject constantexpr elements.
-      return ConstantExpr::getBitCast(C, DestTy);
-
-    if (isa<UndefValue>(Element)) {
-      // Correctly Propagate undef values.
-      Result.append(Ratio, UndefValue::get(DstEltTy));
-      continue;
-    }
-
-    auto *Src = dyn_cast<ConstantInt>(Element);
-    if (!Src)
-      return ConstantExpr::getBitCast(C, DestTy);
-
-    unsigned ShiftAmt = isLittleEndian ? 0 : DstBitSize*(Ratio-1);
-    for (unsigned j = 0; j != Ratio; ++j) {
-      // Shift the piece of the value into the right place, depending on
-      // endianness.
-      Constant *Elt = ConstantExpr::getLShr(Src,
-                                  ConstantInt::get(Src->getType(), ShiftAmt));
-      ShiftAmt += isLittleEndian ? DstBitSize : -DstBitSize;
-
-      // Truncate the element to an integer with the same pointer size and
-      // convert the element back to a pointer using a inttoptr.
-      if (DstEltTy->isPointerTy()) {
-        IntegerType *DstIntTy = Type::getIntNTy(C->getContext(), DstBitSize);
-        Constant *CE = ConstantExpr::getTrunc(Elt, DstIntTy);
-        Result.push_back(ConstantExpr::getIntToPtr(CE, DstEltTy));
-        continue;
-      }
-
-      // Truncate and remember this piece.
-      Result.push_back(ConstantExpr::getTrunc(Elt, DstEltTy));
-    }
-  }
-
-  return ConstantVector::get(Result);
-}
-
-} // end anonymous namespace
-
-/// If this constant is a constant offset from a global, return the global and
-/// the constant. Because of constantexprs, this function is recursive.
-bool llvm::IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV,
-                                      APInt &Offset, const DataLayout &DL) {
-  // Trivial case, constant is the global.
-  if ((GV = dyn_cast<GlobalValue>(C))) {
-    unsigned BitWidth = DL.getIndexTypeSizeInBits(GV->getType());
-    Offset = APInt(BitWidth, 0);
-    return true;
-  }
-
-  // Otherwise, if this isn't a constant expr, bail out.
-  auto *CE = dyn_cast<ConstantExpr>(C);
-  if (!CE) return false;
-
-  // Look through ptr->int and ptr->ptr casts.
-  if (CE->getOpcode() == Instruction::PtrToInt ||
-      CE->getOpcode() == Instruction::BitCast)
-    return IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, DL);
-
-  // i32* getelementptr ([5 x i32]* @a, i32 0, i32 5)
-  auto *GEP = dyn_cast<GEPOperator>(CE);
-  if (!GEP)
-    return false;
-
-  unsigned BitWidth = DL.getIndexTypeSizeInBits(GEP->getType());
-  APInt TmpOffset(BitWidth, 0);
-
-  // If the base isn't a global+constant, we aren't either.
-  if (!IsConstantOffsetFromGlobal(CE->getOperand(0), GV, TmpOffset, DL))
-    return false;
-
-  // Otherwise, add any offset that our operands provide.
-  if (!GEP->accumulateConstantOffset(DL, TmpOffset))
-    return false;
-
-  Offset = TmpOffset;
-  return true;
-}
-
-Constant *llvm::ConstantFoldLoadThroughBitcast(Constant *C, Type *DestTy,
-                                         const DataLayout &DL) {
-  do {
-    Type *SrcTy = C->getType();
-
-    // If the type sizes are the same and a cast is legal, just directly
-    // cast the constant.
-    if (DL.getTypeSizeInBits(DestTy) == DL.getTypeSizeInBits(SrcTy)) {
-      Instruction::CastOps Cast = Instruction::BitCast;
-      // If we are going from a pointer to int or vice versa, we spell the cast
-      // differently.
-      if (SrcTy->isIntegerTy() && DestTy->isPointerTy())
-        Cast = Instruction::IntToPtr;
-      else if (SrcTy->isPointerTy() && DestTy->isIntegerTy())
-        Cast = Instruction::PtrToInt;
-
-      if (CastInst::castIsValid(Cast, C, DestTy))
-        return ConstantExpr::getCast(Cast, C, DestTy);
-    }
-
-    // If this isn't an aggregate type, there is nothing we can do to drill down
-    // and find a bitcastable constant.
-    if (!SrcTy->isAggregateType())
-      return nullptr;
-
-    // We're simulating a load through a pointer that was bitcast to point to
-    // a different type, so we can try to walk down through the initial
-    // elements of an aggregate to see if some part of the aggregate is
-    // castable to implement the "load" semantic model.
-    if (SrcTy->isStructTy()) {
-      // Struct types might have leading zero-length elements like [0 x i32],
-      // which are certainly not what we are looking for, so skip them.
-      unsigned Elem = 0;
-      Constant *ElemC;
-      do {
-        ElemC = C->getAggregateElement(Elem++);
-      } while (ElemC && DL.getTypeSizeInBits(ElemC->getType()) == 0);
-      C = ElemC;
-    } else {
-      C = C->getAggregateElement(0u);
-    }
-  } while (C);
-
-  return nullptr;
-}
-
-namespace {
-
-/// Recursive helper to read bits out of global. C is the constant being copied
-/// out of. ByteOffset is an offset into C. CurPtr is the pointer to copy
-/// results into and BytesLeft is the number of bytes left in
-/// the CurPtr buffer. DL is the DataLayout.
-bool ReadDataFromGlobal(Constant *C, uint64_t ByteOffset, unsigned char *CurPtr,
-                        unsigned BytesLeft, const DataLayout &DL) {
-  assert(ByteOffset <= DL.getTypeAllocSize(C->getType()) &&
-         "Out of range access");
-
-  // If this element is zero or undefined, we can just return since *CurPtr is
-  // zero initialized.
-  if (isa<ConstantAggregateZero>(C) || isa<UndefValue>(C))
-    return true;
-
-  if (auto *CI = dyn_cast<ConstantInt>(C)) {
-    if (CI->getBitWidth() > 64 ||
-        (CI->getBitWidth() & 7) != 0)
-      return false;
-
-    uint64_t Val = CI->getZExtValue();
-    unsigned IntBytes = unsigned(CI->getBitWidth()/8);
-
-    for (unsigned i = 0; i != BytesLeft && ByteOffset != IntBytes; ++i) {
-      int n = ByteOffset;
-      if (!DL.isLittleEndian())
-        n = IntBytes - n - 1;
-      CurPtr[i] = (unsigned char)(Val >> (n * 8));
-      ++ByteOffset;
-    }
-    return true;
-  }
-
-  if (auto *CFP = dyn_cast<ConstantFP>(C)) {
-    if (CFP->getType()->isDoubleTy()) {
-      C = FoldBitCast(C, Type::getInt64Ty(C->getContext()), DL);
-      return ReadDataFromGlobal(C, ByteOffset, CurPtr, BytesLeft, DL);
-    }
-    if (CFP->getType()->isFloatTy()){
-      C = FoldBitCast(C, Type::getInt32Ty(C->getContext()), DL);
-      return ReadDataFromGlobal(C, ByteOffset, CurPtr, BytesLeft, DL);
-    }
-    if (CFP->getType()->isHalfTy()){
-      C = FoldBitCast(C, Type::getInt16Ty(C->getContext()), DL);
-      return ReadDataFromGlobal(C, ByteOffset, CurPtr, BytesLeft, DL);
-    }
-    return false;
-  }
-
-  if (auto *CS = dyn_cast<ConstantStruct>(C)) {
-    const StructLayout *SL = DL.getStructLayout(CS->getType());
-    unsigned Index = SL->getElementContainingOffset(ByteOffset);
-    uint64_t CurEltOffset = SL->getElementOffset(Index);
-    ByteOffset -= CurEltOffset;
-
-    while (true) {
-      // If the element access is to the element itself and not to tail padding,
-      // read the bytes from the element.
-      uint64_t EltSize = DL.getTypeAllocSize(CS->getOperand(Index)->getType());
-
-      if (ByteOffset < EltSize &&
-          !ReadDataFromGlobal(CS->getOperand(Index), ByteOffset, CurPtr,
-                              BytesLeft, DL))
-        return false;
-
-      ++Index;
-
-      // Check to see if we read from the last struct element, if so we're done.
-      if (Index == CS->getType()->getNumElements())
-        return true;
-
-      // If we read all of the bytes we needed from this element we're done.
-      uint64_t NextEltOffset = SL->getElementOffset(Index);
-
-      if (BytesLeft <= NextEltOffset - CurEltOffset - ByteOffset)
-        return true;
-
-      // Move to the next element of the struct.
-      CurPtr += NextEltOffset - CurEltOffset - ByteOffset;
-      BytesLeft -= NextEltOffset - CurEltOffset - ByteOffset;
-      ByteOffset = 0;
-      CurEltOffset = NextEltOffset;
-    }
-    // not reached.
-  }
-
-  if (isa<ConstantArray>(C) || isa<ConstantVector>(C) ||
-      isa<ConstantDataSequential>(C)) {
-    Type *EltTy = C->getType()->getSequentialElementType();
-    uint64_t EltSize = DL.getTypeAllocSize(EltTy);
-    uint64_t Index = ByteOffset / EltSize;
-    uint64_t Offset = ByteOffset - Index * EltSize;
-    uint64_t NumElts;
-    if (auto *AT = dyn_cast<ArrayType>(C->getType()))
-      NumElts = AT->getNumElements();
-    else
-      NumElts = C->getType()->getVectorNumElements();
-
-    for (; Index != NumElts; ++Index) {
-      if (!ReadDataFromGlobal(C->getAggregateElement(Index), Offset, CurPtr,
-                              BytesLeft, DL))
-        return false;
-
-      uint64_t BytesWritten = EltSize - Offset;
-      assert(BytesWritten <= EltSize && "Not indexing into this element?");
-      if (BytesWritten >= BytesLeft)
-        return true;
-
-      Offset = 0;
-      BytesLeft -= BytesWritten;
-      CurPtr += BytesWritten;
-    }
-    return true;
-  }
-
-  if (auto *CE = dyn_cast<ConstantExpr>(C)) {
-    if (CE->getOpcode() == Instruction::IntToPtr &&
-        CE->getOperand(0)->getType() == DL.getIntPtrType(CE->getType())) {
-      return ReadDataFromGlobal(CE->getOperand(0), ByteOffset, CurPtr,
-                                BytesLeft, DL);
-    }
-  }
-
-  // Otherwise, unknown initializer type.
-  return false;
-}
-
-Constant *FoldReinterpretLoadFromConstPtr(Constant *C, Type *LoadTy,
-                                          const DataLayout &DL) {
-  auto *PTy = cast<PointerType>(C->getType());
-  auto *IntType = dyn_cast<IntegerType>(LoadTy);
-
-  // If this isn't an integer load we can't fold it directly.
-  if (!IntType) {
-    unsigned AS = PTy->getAddressSpace();
-
-    // If this is a float/double load, we can try folding it as an int32/64 load
-    // and then bitcast the result.  This can be useful for union cases.  Note
-    // that address spaces don't matter here since we're not going to result in
-    // an actual new load.
-    Type *MapTy;
-    if (LoadTy->isHalfTy())
-      MapTy = Type::getInt16Ty(C->getContext());
-    else if (LoadTy->isFloatTy())
-      MapTy = Type::getInt32Ty(C->getContext());
-    else if (LoadTy->isDoubleTy())
-      MapTy = Type::getInt64Ty(C->getContext());
-    else if (LoadTy->isVectorTy()) {
-      MapTy = PointerType::getIntNTy(C->getContext(),
-                                     DL.getTypeSizeInBits(LoadTy));
-    } else
-      return nullptr;
-
-    C = FoldBitCast(C, MapTy->getPointerTo(AS), DL);
-    if (Constant *Res = FoldReinterpretLoadFromConstPtr(C, MapTy, DL))
-      return FoldBitCast(Res, LoadTy, DL);
-    return nullptr;
-  }
-
-  unsigned BytesLoaded = (IntType->getBitWidth() + 7) / 8;
-  if (BytesLoaded > 32 || BytesLoaded == 0)
-    return nullptr;
-
-  GlobalValue *GVal;
-  APInt OffsetAI;
-  if (!IsConstantOffsetFromGlobal(C, GVal, OffsetAI, DL))
-    return nullptr;
-
-  auto *GV = dyn_cast<GlobalVariable>(GVal);
-  if (!GV || !GV->isConstant() || !GV->hasDefinitiveInitializer() ||
-      !GV->getInitializer()->getType()->isSized())
-    return nullptr;
-
-  int64_t Offset = OffsetAI.getSExtValue();
-  int64_t InitializerSize = DL.getTypeAllocSize(GV->getInitializer()->getType());
-
-  // If we're not accessing anything in this constant, the result is undefined.
-  if (Offset + BytesLoaded <= 0)
-    return UndefValue::get(IntType);
-
-  // If we're not accessing anything in this constant, the result is undefined.
-  if (Offset >= InitializerSize)
-    return UndefValue::get(IntType);
-
-  unsigned char RawBytes[32] = {0};
-  unsigned char *CurPtr = RawBytes;
-  unsigned BytesLeft = BytesLoaded;
-
-  // If we're loading off the beginning of the global, some bytes may be valid.
-  if (Offset < 0) {
-    CurPtr += -Offset;
-    BytesLeft += Offset;
-    Offset = 0;
-  }
-
-  if (!ReadDataFromGlobal(GV->getInitializer(), Offset, CurPtr, BytesLeft, DL))
-    return nullptr;
-
-  APInt ResultVal = APInt(IntType->getBitWidth(), 0);
-  if (DL.isLittleEndian()) {
-    ResultVal = RawBytes[BytesLoaded - 1];
-    for (unsigned i = 1; i != BytesLoaded; ++i) {
-      ResultVal <<= 8;
-      ResultVal |= RawBytes[BytesLoaded - 1 - i];
-    }
-  } else {
-    ResultVal = RawBytes[0];
-    for (unsigned i = 1; i != BytesLoaded; ++i) {
-      ResultVal <<= 8;
-      ResultVal |= RawBytes[i];
-    }
-  }
-
-  return ConstantInt::get(IntType->getContext(), ResultVal);
-}
-
-Constant *ConstantFoldLoadThroughBitcastExpr(ConstantExpr *CE, Type *DestTy,
-                                             const DataLayout &DL) {
-  auto *SrcPtr = CE->getOperand(0);
-  auto *SrcPtrTy = dyn_cast<PointerType>(SrcPtr->getType());
-  if (!SrcPtrTy)
-    return nullptr;
-  Type *SrcTy = SrcPtrTy->getPointerElementType();
-
-  Constant *C = ConstantFoldLoadFromConstPtr(SrcPtr, SrcTy, DL);
-  if (!C)
-    return nullptr;
-
-  return llvm::ConstantFoldLoadThroughBitcast(C, DestTy, DL);
-}
-
-} // end anonymous namespace
-
-Constant *llvm::ConstantFoldLoadFromConstPtr(Constant *C, Type *Ty,
-                                             const DataLayout &DL) {
-  // First, try the easy cases:
-  if (auto *GV = dyn_cast<GlobalVariable>(C))
-    if (GV->isConstant() && GV->hasDefinitiveInitializer())
-      return GV->getInitializer();
-
-  if (auto *GA = dyn_cast<GlobalAlias>(C))
-    if (GA->getAliasee() && !GA->isInterposable())
-      return ConstantFoldLoadFromConstPtr(GA->getAliasee(), Ty, DL);
-
-  // If the loaded value isn't a constant expr, we can't handle it.
-  auto *CE = dyn_cast<ConstantExpr>(C);
-  if (!CE)
-    return nullptr;
-
-  if (CE->getOpcode() == Instruction::GetElementPtr) {
-    if (auto *GV = dyn_cast<GlobalVariable>(CE->getOperand(0))) {
-      if (GV->isConstant() && GV->hasDefinitiveInitializer()) {
-        if (Constant *V =
-             ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE))
-          return V;
-      }
-    }
-  }
-
-  if (CE->getOpcode() == Instruction::BitCast)
-    if (Constant *LoadedC = ConstantFoldLoadThroughBitcastExpr(CE, Ty, DL))
-      return LoadedC;
-
-  // Instead of loading constant c string, use corresponding integer value
-  // directly if string length is small enough.
-  StringRef Str;
-  if (getConstantStringInfo(CE, Str) && !Str.empty()) {
-    size_t StrLen = Str.size();
-    unsigned NumBits = Ty->getPrimitiveSizeInBits();
-    // Replace load with immediate integer if the result is an integer or fp
-    // value.
-    if ((NumBits >> 3) == StrLen + 1 && (NumBits & 7) == 0 &&
-        (isa<IntegerType>(Ty) || Ty->isFloatingPointTy())) {
-      APInt StrVal(NumBits, 0);
-      APInt SingleChar(NumBits, 0);
-      if (DL.isLittleEndian()) {
-        for (unsigned char C : reverse(Str.bytes())) {
-          SingleChar = static_cast<uint64_t>(C);
-          StrVal = (StrVal << 8) | SingleChar;
-        }
-      } else {
-        for (unsigned char C : Str.bytes()) {
-          SingleChar = static_cast<uint64_t>(C);
-          StrVal = (StrVal << 8) | SingleChar;
-        }
-        // Append NULL at the end.
-        SingleChar = 0;
-        StrVal = (StrVal << 8) | SingleChar;
-      }
-
-      Constant *Res = ConstantInt::get(CE->getContext(), StrVal);
-      if (Ty->isFloatingPointTy())
-        Res = ConstantExpr::getBitCast(Res, Ty);
-      return Res;
-    }
-  }
-
-  // If this load comes from anywhere in a constant global, and if the global
-  // is all undef or zero, we know what it loads.
-  if (auto *GV = dyn_cast<GlobalVariable>(GetUnderlyingObject(CE, DL))) {
-    if (GV->isConstant() && GV->hasDefinitiveInitializer()) {
-      if (GV->getInitializer()->isNullValue())
-        return Constant::getNullValue(Ty);
-      if (isa<UndefValue>(GV->getInitializer()))
-        return UndefValue::get(Ty);
-    }
-  }
-
-  // Try hard to fold loads from bitcasted strange and non-type-safe things.
-  return FoldReinterpretLoadFromConstPtr(CE, Ty, DL);
-}
-
-namespace {
-
-Constant *ConstantFoldLoadInst(const LoadInst *LI, const DataLayout &DL) {
-  if (LI->isVolatile()) return nullptr;
-
-  if (auto *C = dyn_cast<Constant>(LI->getOperand(0)))
-    return ConstantFoldLoadFromConstPtr(C, LI->getType(), DL);
-
-  return nullptr;
-}
-
-/// One of Op0/Op1 is a constant expression.
-/// Attempt to symbolically evaluate the result of a binary operator merging
-/// these together.  If target data info is available, it is provided as DL,
-/// otherwise DL is null.
-Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0, Constant *Op1,
-                                    const DataLayout &DL) {
-  // SROA
-
-  // Fold (and 0xffffffff00000000, (shl x, 32)) -> shl.
-  // Fold (lshr (or X, Y), 32) -> (lshr [X/Y], 32) if one doesn't contribute
-  // bits.
-
-  if (Opc == Instruction::And) {
-    KnownBits Known0 = computeKnownBits(Op0, DL);
-    KnownBits Known1 = computeKnownBits(Op1, DL);
-    if ((Known1.One | Known0.Zero).isAllOnesValue()) {
-      // All the bits of Op0 that the 'and' could be masking are already zero.
-      return Op0;
-    }
-    if ((Known0.One | Known1.Zero).isAllOnesValue()) {
-      // All the bits of Op1 that the 'and' could be masking are already zero.
-      return Op1;
-    }
-
-    Known0.Zero |= Known1.Zero;
-    Known0.One &= Known1.One;
-    if (Known0.isConstant())
-      return ConstantInt::get(Op0->getType(), Known0.getConstant());
-  }
-
-  // If the constant expr is something like &A[123] - &A[4].f, fold this into a
-  // constant.  This happens frequently when iterating over a global array.
-  if (Opc == Instruction::Sub) {
-    GlobalValue *GV1, *GV2;
-    APInt Offs1, Offs2;
-
-    if (IsConstantOffsetFromGlobal(Op0, GV1, Offs1, DL))
-      if (IsConstantOffsetFromGlobal(Op1, GV2, Offs2, DL) && GV1 == GV2) {
-        unsigned OpSize = DL.getTypeSizeInBits(Op0->getType());
-
-        // (&GV+C1) - (&GV+C2) -> C1-C2, pointer arithmetic cannot overflow.
-        // PtrToInt may change the bitwidth so we have convert to the right size
-        // first.
-        return ConstantInt::get(Op0->getType(), Offs1.zextOrTrunc(OpSize) -
-                                                Offs2.zextOrTrunc(OpSize));
-      }
-  }
-
-  return nullptr;
-}
-
-/// If array indices are not pointer-sized integers, explicitly cast them so
-/// that they aren't implicitly casted by the getelementptr.
-Constant *CastGEPIndices(Type *SrcElemTy, ArrayRef<Constant *> Ops,
-                         Type *ResultTy, Optional<unsigned> InRangeIndex,
-                         const DataLayout &DL, const TargetLibraryInfo *TLI) {
-  Type *IntPtrTy = DL.getIntPtrType(ResultTy);
-  Type *IntPtrScalarTy = IntPtrTy->getScalarType();
-
-  bool Any = false;
-  SmallVector<Constant*, 32> NewIdxs;
-  for (unsigned i = 1, e = Ops.size(); i != e; ++i) {
-    if ((i == 1 ||
-         !isa<StructType>(GetElementPtrInst::getIndexedType(
-             SrcElemTy, Ops.slice(1, i - 1)))) &&
-        Ops[i]->getType()->getScalarType() != IntPtrScalarTy) {
-      Any = true;
-      Type *NewType = Ops[i]->getType()->isVectorTy()
-                          ? IntPtrTy
-                          : IntPtrTy->getScalarType();
-      NewIdxs.push_back(ConstantExpr::getCast(CastInst::getCastOpcode(Ops[i],
-                                                                      true,
-                                                                      NewType,
-                                                                      true),
-                                              Ops[i], NewType));
-    } else
-      NewIdxs.push_back(Ops[i]);
-  }
-
-  if (!Any)
-    return nullptr;
-
-  Constant *C = ConstantExpr::getGetElementPtr(
-      SrcElemTy, Ops[0], NewIdxs, /*InBounds=*/false, InRangeIndex);
-  if (Constant *Folded = ConstantFoldConstant(C, DL, TLI))
-    C = Folded;
-
-  return C;
-}
-
-/// Strip the pointer casts, but preserve the address space information.
-Constant* StripPtrCastKeepAS(Constant* Ptr, Type *&ElemTy) {
-  assert(Ptr->getType()->isPointerTy() && "Not a pointer type");
-  auto *OldPtrTy = cast<PointerType>(Ptr->getType());
-  Ptr = Ptr->stripPointerCasts();
-  auto *NewPtrTy = cast<PointerType>(Ptr->getType());
-
-  ElemTy = NewPtrTy->getPointerElementType();
-
-  // Preserve the address space number of the pointer.
-  if (NewPtrTy->getAddressSpace() != OldPtrTy->getAddressSpace()) {
-    NewPtrTy = ElemTy->getPointerTo(OldPtrTy->getAddressSpace());
-    Ptr = ConstantExpr::getPointerCast(Ptr, NewPtrTy);
-  }
-  return Ptr;
-}
-
-/// If we can symbolically evaluate the GEP constant expression, do so.
-Constant *SymbolicallyEvaluateGEP(const GEPOperator *GEP,
-                                  ArrayRef<Constant *> Ops,
-                                  const DataLayout &DL,
-                                  const TargetLibraryInfo *TLI) {
-  const GEPOperator *InnermostGEP = GEP;
-  bool InBounds = GEP->isInBounds();
-
-  Type *SrcElemTy = GEP->getSourceElementType();
-  Type *ResElemTy = GEP->getResultElementType();
-  Type *ResTy = GEP->getType();
-  if (!SrcElemTy->isSized())
-    return nullptr;
-
-  if (Constant *C = CastGEPIndices(SrcElemTy, Ops, ResTy,
-                                   GEP->getInRangeIndex(), DL, TLI))
-    return C;
-
-  Constant *Ptr = Ops[0];
-  if (!Ptr->getType()->isPointerTy())
-    return nullptr;
-
-  Type *IntPtrTy = DL.getIntPtrType(Ptr->getType());
-
-  // If this is a constant expr gep that is effectively computing an
-  // "offsetof", fold it into 'cast int Size to T*' instead of 'gep 0, 0, 12'
-  for (unsigned i = 1, e = Ops.size(); i != e; ++i)
-      if (!isa<ConstantInt>(Ops[i])) {
-
-        // If this is "gep i8* Ptr, (sub 0, V)", fold this as:
-        // "inttoptr (sub (ptrtoint Ptr), V)"
-        if (Ops.size() == 2 && ResElemTy->isIntegerTy(8)) {
-          auto *CE = dyn_cast<ConstantExpr>(Ops[1]);
-          assert((!CE || CE->getType() == IntPtrTy) &&
-                 "CastGEPIndices didn't canonicalize index types!");
-          if (CE && CE->getOpcode() == Instruction::Sub &&
-              CE->getOperand(0)->isNullValue()) {
-            Constant *Res = ConstantExpr::getPtrToInt(Ptr, CE->getType());
-            Res = ConstantExpr::getSub(Res, CE->getOperand(1));
-            Res = ConstantExpr::getIntToPtr(Res, ResTy);
-            if (auto *FoldedRes = ConstantFoldConstant(Res, DL, TLI))
-              Res = FoldedRes;
-            return Res;
-          }
-        }
-        return nullptr;
-      }
-
-  unsigned BitWidth = DL.getTypeSizeInBits(IntPtrTy);
-  APInt Offset =
-      APInt(BitWidth,
-            DL.getIndexedOffsetInType(
-                SrcElemTy,
-                makeArrayRef((Value * const *)Ops.data() + 1, Ops.size() - 1)));
-  Ptr = StripPtrCastKeepAS(Ptr, SrcElemTy);
-
-  // If this is a GEP of a GEP, fold it all into a single GEP.
-  while (auto *GEP = dyn_cast<GEPOperator>(Ptr)) {
-    InnermostGEP = GEP;
-    InBounds &= GEP->isInBounds();
-
-    SmallVector<Value *, 4> NestedOps(GEP->op_begin() + 1, GEP->op_end());
-
-    // Do not try the incorporate the sub-GEP if some index is not a number.
-    bool AllConstantInt = true;
-    for (Value *NestedOp : NestedOps)
-      if (!isa<ConstantInt>(NestedOp)) {
-        AllConstantInt = false;
-        break;
-      }
-    if (!AllConstantInt)
-      break;
-
-    Ptr = cast<Constant>(GEP->getOperand(0));
-    SrcElemTy = GEP->getSourceElementType();
-    Offset += APInt(BitWidth, DL.getIndexedOffsetInType(SrcElemTy, NestedOps));
-    Ptr = StripPtrCastKeepAS(Ptr, SrcElemTy);
-  }
-
-  // If the base value for this address is a literal integer value, fold the
-  // getelementptr to the resulting integer value casted to the pointer type.
-  APInt BasePtr(BitWidth, 0);
-  if (auto *CE = dyn_cast<ConstantExpr>(Ptr)) {
-    if (CE->getOpcode() == Instruction::IntToPtr) {
-      if (auto *Base = dyn_cast<ConstantInt>(CE->getOperand(0)))
-        BasePtr = Base->getValue().zextOrTrunc(BitWidth);
-    }
-  }
-
-  auto *PTy = cast<PointerType>(Ptr->getType());
-  if ((Ptr->isNullValue() || BasePtr != 0) &&
-      !DL.isNonIntegralPointerType(PTy)) {
-    Constant *C = ConstantInt::get(Ptr->getContext(), Offset + BasePtr);
-    return ConstantExpr::getIntToPtr(C, ResTy);
-  }
-
-  // Otherwise form a regular getelementptr. Recompute the indices so that
-  // we eliminate over-indexing of the notional static type array bounds.
-  // This makes it easy to determine if the getelementptr is "inbounds".
-  // Also, this helps GlobalOpt do SROA on GlobalVariables.
-  Type *Ty = PTy;
-  SmallVector<Constant *, 32> NewIdxs;
-
-  do {
-    if (!Ty->isStructTy()) {
-      if (Ty->isPointerTy()) {
-        // The only pointer indexing we'll do is on the first index of the GEP.
-        if (!NewIdxs.empty())
-          break;
-
-        Ty = SrcElemTy;
-
-        // Only handle pointers to sized types, not pointers to functions.
-        if (!Ty->isSized())
-          return nullptr;
-      } else if (auto *ATy = dyn_cast<SequentialType>(Ty)) {
-        Ty = ATy->getElementType();
-      } else {
-        // We've reached some non-indexable type.
-        break;
-      }
-
-      // Determine which element of the array the offset points into.
-      APInt ElemSize(BitWidth, DL.getTypeAllocSize(Ty));
-      if (ElemSize == 0) {
-        // The element size is 0. This may be [0 x Ty]*, so just use a zero
-        // index for this level and proceed to the next level to see if it can
-        // accommodate the offset.
-        NewIdxs.push_back(ConstantInt::get(IntPtrTy, 0));
-      } else {
-        // The element size is non-zero divide the offset by the element
-        // size (rounding down), to compute the index at this level.
-        bool Overflow;
-        APInt NewIdx = Offset.sdiv_ov(ElemSize, Overflow);
-        if (Overflow)
-          break;
-        Offset -= NewIdx * ElemSize;
-        NewIdxs.push_back(ConstantInt::get(IntPtrTy, NewIdx));
-      }
-    } else {
-      auto *STy = cast<StructType>(Ty);
-      // If we end up with an offset that isn't valid for this struct type, we
-      // can't re-form this GEP in a regular form, so bail out. The pointer
-      // operand likely went through casts that are necessary to make the GEP
-      // sensible.
-      const StructLayout &SL = *DL.getStructLayout(STy);
-      if (Offset.isNegative() || Offset.uge(SL.getSizeInBytes()))
-        break;
-
-      // Determine which field of the struct the offset points into. The
-      // getZExtValue is fine as we've already ensured that the offset is
-      // within the range representable by the StructLayout API.
-      unsigned ElIdx = SL.getElementContainingOffset(Offset.getZExtValue());
-      NewIdxs.push_back(ConstantInt::get(Type::getInt32Ty(Ty->getContext()),
-                                         ElIdx));
-      Offset -= APInt(BitWidth, SL.getElementOffset(ElIdx));
-      Ty = STy->getTypeAtIndex(ElIdx);
-    }
-  } while (Ty != ResElemTy);
-
-  // If we haven't used up the entire offset by descending the static
-  // type, then the offset is pointing into the middle of an indivisible
-  // member, so we can't simplify it.
-  if (Offset != 0)
-    return nullptr;
-
-  // Preserve the inrange index from the innermost GEP if possible. We must
-  // have calculated the same indices up to and including the inrange index.
-  Optional<unsigned> InRangeIndex;
-  if (Optional<unsigned> LastIRIndex = InnermostGEP->getInRangeIndex())
-    if (SrcElemTy == InnermostGEP->getSourceElementType() &&
-        NewIdxs.size() > *LastIRIndex) {
-      InRangeIndex = LastIRIndex;
-      for (unsigned I = 0; I <= *LastIRIndex; ++I)
-        if (NewIdxs[I] != InnermostGEP->getOperand(I + 1))
-          return nullptr;
-    }
-
-  // Create a GEP.
-  Constant *C = ConstantExpr::getGetElementPtr(SrcElemTy, Ptr, NewIdxs,
-                                               InBounds, InRangeIndex);
-  assert(C->getType()->getPointerElementType() == Ty &&
-         "Computed GetElementPtr has unexpected type!");
-
-  // If we ended up indexing a member with a type that doesn't match
-  // the type of what the original indices indexed, add a cast.
-  if (Ty != ResElemTy)
-    C = FoldBitCast(C, ResTy, DL);
-
-  return C;
-}
-
-/// Attempt to constant fold an instruction with the
-/// specified opcode and operands.  If successful, the constant result is
-/// returned, if not, null is returned.  Note that this function can fail when
-/// attempting to fold instructions like loads and stores, which have no
-/// constant expression form.
-Constant *ConstantFoldInstOperandsImpl(const Value *InstOrCE, unsigned Opcode,
-                                       ArrayRef<Constant *> Ops,
-                                       const DataLayout &DL,
-                                       const TargetLibraryInfo *TLI) {
-  Type *DestTy = InstOrCE->getType();
-
-  if (Instruction::isUnaryOp(Opcode))
-    return ConstantFoldUnaryOpOperand(Opcode, Ops[0], DL);
-
-  if (Instruction::isBinaryOp(Opcode))
-    return ConstantFoldBinaryOpOperands(Opcode, Ops[0], Ops[1], DL);
-
-  if (Instruction::isCast(Opcode))
-    return ConstantFoldCastOperand(Opcode, Ops[0], DestTy, DL);
-
-  if (auto *GEP = dyn_cast<GEPOperator>(InstOrCE)) {
-    if (Constant *C = SymbolicallyEvaluateGEP(GEP, Ops, DL, TLI))
-      return C;
-
-    return ConstantExpr::getGetElementPtr(GEP->getSourceElementType(), Ops[0],
-                                          Ops.slice(1), GEP->isInBounds(),
-                                          GEP->getInRangeIndex());
-  }
-
-  if (auto *CE = dyn_cast<ConstantExpr>(InstOrCE))
-    return CE->getWithOperands(Ops);
-
-  switch (Opcode) {
-  default: return nullptr;
-  case Instruction::ICmp:
-  case Instruction::FCmp: llvm_unreachable("Invalid for compares");
-  case Instruction::Call:
-    if (auto *F = dyn_cast<Function>(Ops.back())) {
-      const auto *Call = cast<CallBase>(InstOrCE);
-      if (canConstantFoldCallTo(Call, F))
-        return ConstantFoldCall(Call, F, Ops.slice(0, Ops.size() - 1), TLI);
-    }
-    return nullptr;
-  case Instruction::Select:
-    return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
-  case Instruction::ExtractElement:
-    return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
-  case Instruction::ExtractValue:
-    return ConstantExpr::getExtractValue(
-        Ops[0], dyn_cast<ExtractValueInst>(InstOrCE)->getIndices());
-  case Instruction::InsertElement:
-    return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
-  case Instruction::ShuffleVector:
-    return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
-  }
-}
-
-} // end anonymous namespace
-
-//===----------------------------------------------------------------------===//
-// Constant Folding public APIs
-//===----------------------------------------------------------------------===//
-
-namespace {
-
-Constant *
-ConstantFoldConstantImpl(const Constant *C, const DataLayout &DL,
-                         const TargetLibraryInfo *TLI,
-                         SmallDenseMap<Constant *, Constant *> &FoldedOps) {
-  if (!isa<ConstantVector>(C) && !isa<ConstantExpr>(C))
-    return nullptr;
-
-  SmallVector<Constant *, 8> Ops;
-  for (const Use &NewU : C->operands()) {
-    auto *NewC = cast<Constant>(&NewU);
-    // Recursively fold the ConstantExpr's operands. If we have already folded
-    // a ConstantExpr, we don't have to process it again.
-    if (isa<ConstantVector>(NewC) || isa<ConstantExpr>(NewC)) {
-      auto It = FoldedOps.find(NewC);
-      if (It == FoldedOps.end()) {
-        if (auto *FoldedC =
-                ConstantFoldConstantImpl(NewC, DL, TLI, FoldedOps)) {
-          FoldedOps.insert({NewC, FoldedC});
-          NewC = FoldedC;
-        } else {
-          FoldedOps.insert({NewC, NewC});
-        }
-      } else {
-        NewC = It->second;
-      }
-    }
-    Ops.push_back(NewC);
-  }
-
-  if (auto *CE = dyn_cast<ConstantExpr>(C)) {
-    if (CE->isCompare())
-      return ConstantFoldCompareInstOperands(CE->getPredicate(), Ops[0], Ops[1],
-                                             DL, TLI);
-
-    return ConstantFoldInstOperandsImpl(CE, CE->getOpcode(), Ops, DL, TLI);
-  }
-
-  assert(isa<ConstantVector>(C));
-  return ConstantVector::get(Ops);
-}
-
-} // end anonymous namespace
-
-Constant *llvm::ConstantFoldInstruction(Instruction *I, const DataLayout &DL,
-                                        const TargetLibraryInfo *TLI) {
-  // Handle PHI nodes quickly here...
-  if (auto *PN = dyn_cast<PHINode>(I)) {
-    Constant *CommonValue = nullptr;
-
-    SmallDenseMap<Constant *, Constant *> FoldedOps;
-    for (Value *Incoming : PN->incoming_values()) {
-      // If the incoming value is undef then skip it.  Note that while we could
-      // skip the value if it is equal to the phi node itself we choose not to
-      // because that would break the rule that constant folding only applies if
-      // all operands are constants.
-      if (isa<UndefValue>(Incoming))
-        continue;
-      // If the incoming value is not a constant, then give up.
-      auto *C = dyn_cast<Constant>(Incoming);
-      if (!C)
-        return nullptr;
-      // Fold the PHI's operands.
-      if (auto *FoldedC = ConstantFoldConstantImpl(C, DL, TLI, FoldedOps))
-        C = FoldedC;
-      // If the incoming value is a different constant to
-      // the one we saw previously, then give up.
-      if (CommonValue && C != CommonValue)
-        return nullptr;
-      CommonValue = C;
-    }
-
-    // If we reach here, all incoming values are the same constant or undef.
-    return CommonValue ? CommonValue : UndefValue::get(PN->getType());
-  }
-
-  // Scan the operand list, checking to see if they are all constants, if so,
-  // hand off to ConstantFoldInstOperandsImpl.
-  if (!all_of(I->operands(), [](Use &U) { return isa<Constant>(U); }))
-    return nullptr;
-
-  SmallDenseMap<Constant *, Constant *> FoldedOps;
-  SmallVector<Constant *, 8> Ops;
-  for (const Use &OpU : I->operands()) {
-    auto *Op = cast<Constant>(&OpU);
-    // Fold the Instruction's operands.
-    if (auto *FoldedOp = ConstantFoldConstantImpl(Op, DL, TLI, FoldedOps))
-      Op = FoldedOp;
-
-    Ops.push_back(Op);
-  }
-
-  if (const auto *CI = dyn_cast<CmpInst>(I))
-    return ConstantFoldCompareInstOperands(CI->getPredicate(), Ops[0], Ops[1],
-                                           DL, TLI);
-
-  if (const auto *LI = dyn_cast<LoadInst>(I))
-    return ConstantFoldLoadInst(LI, DL);
-
-  if (auto *IVI = dyn_cast<InsertValueInst>(I)) {
-    return ConstantExpr::getInsertValue(
-                                cast<Constant>(IVI->getAggregateOperand()),
-                                cast<Constant>(IVI->getInsertedValueOperand()),
-                                IVI->getIndices());
-  }
-
-  if (auto *EVI = dyn_cast<ExtractValueInst>(I)) {
-    return ConstantExpr::getExtractValue(
-                                    cast<Constant>(EVI->getAggregateOperand()),
-                                    EVI->getIndices());
-  }
-
-  return ConstantFoldInstOperands(I, Ops, DL, TLI);
-}
-
-Constant *llvm::ConstantFoldConstant(const Constant *C, const DataLayout &DL,
-                                     const TargetLibraryInfo *TLI) {
-  SmallDenseMap<Constant *, Constant *> FoldedOps;
-  return ConstantFoldConstantImpl(C, DL, TLI, FoldedOps);
-}
-
-Constant *llvm::ConstantFoldInstOperands(Instruction *I,
-                                         ArrayRef<Constant *> Ops,
-                                         const DataLayout &DL,
-                                         const TargetLibraryInfo *TLI) {
-  return ConstantFoldInstOperandsImpl(I, I->getOpcode(), Ops, DL, TLI);
-}
-
-Constant *llvm::ConstantFoldCompareInstOperands(unsigned Predicate,
-                                                Constant *Ops0, Constant *Ops1,
-                                                const DataLayout &DL,
-                                                const TargetLibraryInfo *TLI) {
-  // fold: icmp (inttoptr x), null         -> icmp x, 0
-  // fold: icmp null, (inttoptr x)         -> icmp 0, x
-  // fold: icmp (ptrtoint x), 0            -> icmp x, null
-  // fold: icmp 0, (ptrtoint x)            -> icmp null, x
-  // fold: icmp (inttoptr x), (inttoptr y) -> icmp trunc/zext x, trunc/zext y
-  // fold: icmp (ptrtoint x), (ptrtoint y) -> icmp x, y
-  //
-  // FIXME: The following comment is out of data and the DataLayout is here now.
-  // ConstantExpr::getCompare cannot do this, because it doesn't have DL
-  // around to know if bit truncation is happening.
-  if (auto *CE0 = dyn_cast<ConstantExpr>(Ops0)) {
-    if (Ops1->isNullValue()) {
-      if (CE0->getOpcode() == Instruction::IntToPtr) {
-        Type *IntPtrTy = DL.getIntPtrType(CE0->getType());
-        // Convert the integer value to the right size to ensure we get the
-        // proper extension or truncation.
-        Constant *C = ConstantExpr::getIntegerCast(CE0->getOperand(0),
-                                                   IntPtrTy, false);
-        Constant *Null = Constant::getNullValue(C->getType());
-        return ConstantFoldCompareInstOperands(Predicate, C, Null, DL, TLI);
-      }
-
-      // Only do this transformation if the int is intptrty in size, otherwise
-      // there is a truncation or extension that we aren't modeling.
-      if (CE0->getOpcode() == Instruction::PtrToInt) {
-        Type *IntPtrTy = DL.getIntPtrType(CE0->getOperand(0)->getType());
-        if (CE0->getType() == IntPtrTy) {
-          Constant *C = CE0->getOperand(0);
-          Constant *Null = Constant::getNullValue(C->getType());
-          return ConstantFoldCompareInstOperands(Predicate, C, Null, DL, TLI);
-        }
-      }
-    }
-
-    if (auto *CE1 = dyn_cast<ConstantExpr>(Ops1)) {
-      if (CE0->getOpcode() == CE1->getOpcode()) {
-        if (CE0->getOpcode() == Instruction::IntToPtr) {
-          Type *IntPtrTy = DL.getIntPtrType(CE0->getType());
-
-          // Convert the integer value to the right size to ensure we get the
-          // proper extension or truncation.
-          Constant *C0 = ConstantExpr::getIntegerCast(CE0->getOperand(0),
-                                                      IntPtrTy, false);
-          Constant *C1 = ConstantExpr::getIntegerCast(CE1->getOperand(0),
-                                                      IntPtrTy, false);
-          return ConstantFoldCompareInstOperands(Predicate, C0, C1, DL, TLI);
-        }
-
-        // Only do this transformation if the int is intptrty in size, otherwise
-        // there is a truncation or extension that we aren't modeling.
-        if (CE0->getOpcode() == Instruction::PtrToInt) {
-          Type *IntPtrTy = DL.getIntPtrType(CE0->getOperand(0)->getType());
-          if (CE0->getType() == IntPtrTy &&
-              CE0->getOperand(0)->getType() == CE1->getOperand(0)->getType()) {
-            return ConstantFoldCompareInstOperands(
-                Predicate, CE0->getOperand(0), CE1->getOperand(0), DL, TLI);
-          }
-        }
-      }
-    }
-
-    // icmp eq (or x, y), 0 -> (icmp eq x, 0) & (icmp eq y, 0)
-    // icmp ne (or x, y), 0 -> (icmp ne x, 0) | (icmp ne y, 0)
-    if ((Predicate == ICmpInst::ICMP_EQ || Predicate == ICmpInst::ICMP_NE) &&
-        CE0->getOpcode() == Instruction::Or && Ops1->isNullValue()) {
-      Constant *LHS = ConstantFoldCompareInstOperands(
-          Predicate, CE0->getOperand(0), Ops1, DL, TLI);
-      Constant *RHS = ConstantFoldCompareInstOperands(
-          Predicate, CE0->getOperand(1), Ops1, DL, TLI);
-      unsigned OpC =
-        Predicate == ICmpInst::ICMP_EQ ? Instruction::And : Instruction::Or;
-      return ConstantFoldBinaryOpOperands(OpC, LHS, RHS, DL);
-    }
-  } else if (isa<ConstantExpr>(Ops1)) {
-    // If RHS is a constant expression, but the left side isn't, swap the
-    // operands and try again.
-    Predicate = ICmpInst::getSwappedPredicate((ICmpInst::Predicate)Predicate);
-    return ConstantFoldCompareInstOperands(Predicate, Ops1, Ops0, DL, TLI);
-  }
-
-  return ConstantExpr::getCompare(Predicate, Ops0, Ops1);
-}
-
-Constant *llvm::ConstantFoldUnaryOpOperand(unsigned Opcode, Constant *Op,
-                                           const DataLayout &DL) {
-  assert(Instruction::isUnaryOp(Opcode));
-
-  return ConstantExpr::get(Opcode, Op);
-}
-
-Constant *llvm::ConstantFoldBinaryOpOperands(unsigned Opcode, Constant *LHS,
-                                             Constant *RHS,
-                                             const DataLayout &DL) {
-  assert(Instruction::isBinaryOp(Opcode));
-  if (isa<ConstantExpr>(LHS) || isa<ConstantExpr>(RHS))
-    if (Constant *C = SymbolicallyEvaluateBinop(Opcode, LHS, RHS, DL))
-      return C;
-
-  return ConstantExpr::get(Opcode, LHS, RHS);
-}
-
-Constant *llvm::ConstantFoldCastOperand(unsigned Opcode, Constant *C,
-                                        Type *DestTy, const DataLayout &DL) {
-  assert(Instruction::isCast(Opcode));
-  switch (Opcode) {
-  default:
-    llvm_unreachable("Missing case");
-  case Instruction::PtrToInt:
-    // If the input is a inttoptr, eliminate the pair.  This requires knowing
-    // the width of a pointer, so it can't be done in ConstantExpr::getCast.
-    if (auto *CE = dyn_cast<ConstantExpr>(C)) {
-      if (CE->getOpcode() == Instruction::IntToPtr) {
-        Constant *Input = CE->getOperand(0);
-        unsigned InWidth = Input->getType()->getScalarSizeInBits();
-        unsigned PtrWidth = DL.getPointerTypeSizeInBits(CE->getType());
-        if (PtrWidth < InWidth) {
-          Constant *Mask =
-            ConstantInt::get(CE->getContext(),
-                             APInt::getLowBitsSet(InWidth, PtrWidth));
-          Input = ConstantExpr::getAnd(Input, Mask);
-        }
-        // Do a zext or trunc to get to the dest size.
-        return ConstantExpr::getIntegerCast(Input, DestTy, false);
-      }
-    }
-    return ConstantExpr::getCast(Opcode, C, DestTy);
-  case Instruction::IntToPtr:
-    // If the input is a ptrtoint, turn the pair into a ptr to ptr bitcast if
-    // the int size is >= the ptr size and the address spaces are the same.
-    // This requires knowing the width of a pointer, so it can't be done in
-    // ConstantExpr::getCast.
-    if (auto *CE = dyn_cast<ConstantExpr>(C)) {
-      if (CE->getOpcode() == Instruction::PtrToInt) {
-        Constant *SrcPtr = CE->getOperand(0);
-        unsigned SrcPtrSize = DL.getPointerTypeSizeInBits(SrcPtr->getType());
-        unsigned MidIntSize = CE->getType()->getScalarSizeInBits();
-
-        if (MidIntSize >= SrcPtrSize) {
-          unsigned SrcAS = SrcPtr->getType()->getPointerAddressSpace();
-          if (SrcAS == DestTy->getPointerAddressSpace())
-            return FoldBitCast(CE->getOperand(0), DestTy, DL);
-        }
-      }
-    }
-
-    return ConstantExpr::getCast(Opcode, C, DestTy);
-  case Instruction::Trunc:
-  case Instruction::ZExt:
-  case Instruction::SExt:
-  case Instruction::FPTrunc:
-  case Instruction::FPExt:
-  case Instruction::UIToFP:
-  case Instruction::SIToFP:
-  case Instruction::FPToUI:
-  case Instruction::FPToSI:
-  case Instruction::AddrSpaceCast:
-      return ConstantExpr::getCast(Opcode, C, DestTy);
-  case Instruction::BitCast:
-    return FoldBitCast(C, DestTy, DL);
-  }
-}
-
-Constant *llvm::ConstantFoldLoadThroughGEPConstantExpr(Constant *C,
-                                                       ConstantExpr *CE) {
-  if (!CE->getOperand(1)->isNullValue())
-    return nullptr;  // Do not allow stepping over the value!
-
-  // Loop over all of the operands, tracking down which value we are
-  // addressing.
-  for (unsigned i = 2, e = CE->getNumOperands(); i != e; ++i) {
-    C = C->getAggregateElement(CE->getOperand(i));
-    if (!C)
-      return nullptr;
-  }
-  return C;
-}
-
-Constant *
-llvm::ConstantFoldLoadThroughGEPIndices(Constant *C,
-                                        ArrayRef<Constant *> Indices) {
-  // Loop over all of the operands, tracking down which value we are
-  // addressing.
-  for (Constant *Index : Indices) {
-    C = C->getAggregateElement(Index);
-    if (!C)
-      return nullptr;
-  }
-  return C;
-}
-
-//===----------------------------------------------------------------------===//
-//  Constant Folding for Calls
-//
-
-bool llvm::canConstantFoldCallTo(const CallBase *Call, const Function *F) {
-  if (Call->isNoBuiltin() || Call->isStrictFP())
-    return false;
-  switch (F->getIntrinsicID()) {
-  case Intrinsic::fabs:
-  case Intrinsic::minnum:
-  case Intrinsic::maxnum:
-  case Intrinsic::minimum:
-  case Intrinsic::maximum:
-  case Intrinsic::log:
-  case Intrinsic::log2:
-  case Intrinsic::log10:
-  case Intrinsic::exp:
-  case Intrinsic::exp2:
-  case Intrinsic::floor:
-  case Intrinsic::ceil:
-  case Intrinsic::sqrt:
-  case Intrinsic::sin:
-  case Intrinsic::cos:
-  case Intrinsic::trunc:
-  case Intrinsic::rint:
-  case Intrinsic::nearbyint:
-  case Intrinsic::pow:
-  case Intrinsic::powi:
-  case Intrinsic::bswap:
-  case Intrinsic::ctpop:
-  case Intrinsic::ctlz:
-  case Intrinsic::cttz:
-  case Intrinsic::fshl:
-  case Intrinsic::fshr:
-  case Intrinsic::fma:
-  case Intrinsic::fmuladd:
-  case Intrinsic::copysign:
-  case Intrinsic::launder_invariant_group:
-  case Intrinsic::strip_invariant_group:
-  case Intrinsic::round:
-  case Intrinsic::masked_load:
-  case Intrinsic::sadd_with_overflow:
-  case Intrinsic::uadd_with_overflow:
-  case Intrinsic::ssub_with_overflow:
-  case Intrinsic::usub_with_overflow:
-  case Intrinsic::smul_with_overflow:
-  case Intrinsic::umul_with_overflow:
-  case Intrinsic::sadd_sat:
-  case Intrinsic::uadd_sat:
-  case Intrinsic::ssub_sat:
-  case Intrinsic::usub_sat:
-  case Intrinsic::smul_fix:
-  case Intrinsic::smul_fix_sat:
-  case Intrinsic::convert_from_fp16:
-  case Intrinsic::convert_to_fp16:
-  case Intrinsic::bitreverse:
-  case Intrinsic::x86_sse_cvtss2si:
-  case Intrinsic::x86_sse_cvtss2si64:
-  case Intrinsic::x86_sse_cvttss2si:
-  case Intrinsic::x86_sse_cvttss2si64:
-  case Intrinsic::x86_sse2_cvtsd2si:
-  case Intrinsic::x86_sse2_cvtsd2si64:
-  case Intrinsic::x86_sse2_cvttsd2si:
-  case Intrinsic::x86_sse2_cvttsd2si64:
-  case Intrinsic::x86_avx512_vcvtss2si32:
-  case Intrinsic::x86_avx512_vcvtss2si64:
-  case Intrinsic::x86_avx512_cvttss2si:
-  case Intrinsic::x86_avx512_cvttss2si64:
-  case Intrinsic::x86_avx512_vcvtsd2si32:
-  case Intrinsic::x86_avx512_vcvtsd2si64:
-  case Intrinsic::x86_avx512_cvttsd2si:
-  case Intrinsic::x86_avx512_cvttsd2si64:
-  case Intrinsic::x86_avx512_vcvtss2usi32:
-  case Intrinsic::x86_avx512_vcvtss2usi64:
-  case Intrinsic::x86_avx512_cvttss2usi:
-  case Intrinsic::x86_avx512_cvttss2usi64:
-  case Intrinsic::x86_avx512_vcvtsd2usi32:
-  case Intrinsic::x86_avx512_vcvtsd2usi64:
-  case Intrinsic::x86_avx512_cvttsd2usi:
-  case Intrinsic::x86_avx512_cvttsd2usi64:
-  case Intrinsic::is_constant:
-    return true;
-  default:
-    return false;
-  case Intrinsic::not_intrinsic: break;
-  }
-
-  if (!F->hasName())
-    return false;
-  StringRef Name = F->getName();
-
-  // In these cases, the check of the length is required.  We don't want to
-  // return true for a name like "cos\0blah" which strcmp would return equal to
-  // "cos", but has length 8.
-  switch (Name[0]) {
-  default:
-    return false;
-  case 'a':
-    return Name == "acos" || Name == "asin" || Name == "atan" ||
-           Name == "atan2" || Name == "acosf" || Name == "asinf" ||
-           Name == "atanf" || Name == "atan2f";
-  case 'c':
-    return Name == "ceil" || Name == "cos" || Name == "cosh" ||
-           Name == "ceilf" || Name == "cosf" || Name == "coshf";
-  case 'e':
-    return Name == "exp" || Name == "exp2" || Name == "expf" || Name == "exp2f";
-  case 'f':
-    return Name == "fabs" || Name == "floor" || Name == "fmod" ||
-           Name == "fabsf" || Name == "floorf" || Name == "fmodf";
-  case 'l':
-    return Name == "log" || Name == "log10" || Name == "logf" ||
-           Name == "log10f";
-  case 'p':
-    return Name == "pow" || Name == "powf";
-  case 'r':
-    return Name == "round" || Name == "roundf";
-  case 's':
-    return Name == "sin" || Name == "sinh" || Name == "sqrt" ||
-           Name == "sinf" || Name == "sinhf" || Name == "sqrtf";
-  case 't':
-    return Name == "tan" || Name == "tanh" || Name == "tanf" || Name == "tanhf";
-  case '_':
-
-    // Check for various function names that get used for the math functions
-    // when the header files are preprocessed with the macro
-    // __FINITE_MATH_ONLY__ enabled.
-    // The '12' here is the length of the shortest name that can match.
-    // We need to check the size before looking at Name[1] and Name[2]
-    // so we may as well check a limit that will eliminate mismatches.
-    if (Name.size() < 12 || Name[1] != '_')
-      return false;
-    switch (Name[2]) {
-    default:
-      return false;
-    case 'a':
-      return Name == "__acos_finite" || Name == "__acosf_finite" ||
-             Name == "__asin_finite" || Name == "__asinf_finite" ||
-             Name == "__atan2_finite" || Name == "__atan2f_finite";
-    case 'c':
-      return Name == "__cosh_finite" || Name == "__coshf_finite";
-    case 'e':
-      return Name == "__exp_finite" || Name == "__expf_finite" ||
-             Name == "__exp2_finite" || Name == "__exp2f_finite";
-    case 'l':
-      return Name == "__log_finite" || Name == "__logf_finite" ||
-             Name == "__log10_finite" || Name == "__log10f_finite";
-    case 'p':
-      return Name == "__pow_finite" || Name == "__powf_finite";
-    case 's':
-      return Name == "__sinh_finite" || Name == "__sinhf_finite";
-    }
-  }
-}
-
-namespace {
-
-Constant *GetConstantFoldFPValue(double V, Type *Ty) {
-  if (Ty->isHalfTy() || Ty->isFloatTy()) {
-    APFloat APF(V);
-    bool unused;
-    APF.convert(Ty->getFltSemantics(), APFloat::rmNearestTiesToEven, &unused);
-    return ConstantFP::get(Ty->getContext(), APF);
-  }
-  if (Ty->isDoubleTy())
-    return ConstantFP::get(Ty->getContext(), APFloat(V));
-  llvm_unreachable("Can only constant fold half/float/double");
-}
-
-/// Clear the floating-point exception state.
-inline void llvm_fenv_clearexcept() {
-#if defined(HAVE_FENV_H) && HAVE_DECL_FE_ALL_EXCEPT
-  feclearexcept(FE_ALL_EXCEPT);
-#endif
-  errno = 0;
-}
-
-/// Test if a floating-point exception was raised.
-inline bool llvm_fenv_testexcept() {
-  int errno_val = errno;
-  if (errno_val == ERANGE || errno_val == EDOM)
-    return true;
-#if defined(HAVE_FENV_H) && HAVE_DECL_FE_ALL_EXCEPT && HAVE_DECL_FE_INEXACT
-  if (fetestexcept(FE_ALL_EXCEPT & ~FE_INEXACT))
-    return true;
-#endif
-  return false;
-}
-
-Constant *ConstantFoldFP(double (*NativeFP)(double), double V, Type *Ty) {
-  llvm_fenv_clearexcept();
-  V = NativeFP(V);
-  if (llvm_fenv_testexcept()) {
-    llvm_fenv_clearexcept();
-    return nullptr;
-  }
-
-  return GetConstantFoldFPValue(V, Ty);
-}
-
-Constant *ConstantFoldBinaryFP(double (*NativeFP)(double, double), double V,
-                               double W, Type *Ty) {
-  llvm_fenv_clearexcept();
-  V = NativeFP(V, W);
-  if (llvm_fenv_testexcept()) {
-    llvm_fenv_clearexcept();
-    return nullptr;
-  }
-
-  return GetConstantFoldFPValue(V, Ty);
-}
-
-/// Attempt to fold an SSE floating point to integer conversion of a constant
-/// floating point. If roundTowardZero is false, the default IEEE rounding is
-/// used (toward nearest, ties to even). This matches the behavior of the
-/// non-truncating SSE instructions in the default rounding mode. The desired
-/// integer type Ty is used to select how many bits are available for the
-/// result. Returns null if the conversion cannot be performed, otherwise
-/// returns the Constant value resulting from the conversion.
-Constant *ConstantFoldSSEConvertToInt(const APFloat &Val, bool roundTowardZero,
-                                      Type *Ty, bool IsSigned) {
-  // All of these conversion intrinsics form an integer of at most 64bits.
-  unsigned ResultWidth = Ty->getIntegerBitWidth();
-  assert(ResultWidth <= 64 &&
-         "Can only constant fold conversions to 64 and 32 bit ints");
-
-  uint64_t UIntVal;
-  bool isExact = false;
-  APFloat::roundingMode mode = roundTowardZero? APFloat::rmTowardZero
-                                              : APFloat::rmNearestTiesToEven;
-  APFloat::opStatus status =
-      Val.convertToInteger(makeMutableArrayRef(UIntVal), ResultWidth,
-                           IsSigned, mode, &isExact);
-  if (status != APFloat::opOK &&
-      (!roundTowardZero || status != APFloat::opInexact))
-    return nullptr;
-  return ConstantInt::get(Ty, UIntVal, IsSigned);
-}
-
-double getValueAsDouble(ConstantFP *Op) {
-  Type *Ty = Op->getType();
-
-  if (Ty->isFloatTy())
-    return Op->getValueAPF().convertToFloat();
-
-  if (Ty->isDoubleTy())
-    return Op->getValueAPF().convertToDouble();
-
-  bool unused;
-  APFloat APF = Op->getValueAPF();
-  APF.convert(APFloat::IEEEdouble(), APFloat::rmNearestTiesToEven, &unused);
-  return APF.convertToDouble();
-}
-
-static bool isManifestConstant(const Constant *c) {
-  if (isa<ConstantData>(c)) {
-    return true;
-  } else if (isa<ConstantAggregate>(c) || isa<ConstantExpr>(c)) {
-    for (const Value *subc : c->operand_values()) {
-      if (!isManifestConstant(cast<Constant>(subc)))
-        return false;
-    }
-    return true;
-  }
-  return false;
-}
-
-static bool getConstIntOrUndef(Value *Op, const APInt *&C) {
-  if (auto *CI = dyn_cast<ConstantInt>(Op)) {
-    C = &CI->getValue();
-    return true;
-  }
-  if (isa<UndefValue>(Op)) {
-    C = nullptr;
-    return true;
-  }
-  return false;
-}
-
-static Constant *ConstantFoldScalarCall1(StringRef Name,
-                                         Intrinsic::ID IntrinsicID,
-                                         Type *Ty,
-                                         ArrayRef<Constant *> Operands,
-                                         const TargetLibraryInfo *TLI,
-                                         const CallBase *Call) {
-  assert(Operands.size() == 1 && "Wrong number of operands.");
-
-  if (IntrinsicID == Intrinsic::is_constant) {
-    // We know we have a "Constant" argument. But we want to only
-    // return true for manifest constants, not those that depend on
-    // constants with unknowable values, e.g. GlobalValue or BlockAddress.
-    if (isManifestConstant(Operands[0]))
-      return ConstantInt::getTrue(Ty->getContext());
-    return nullptr;
-  }
-  if (isa<UndefValue>(Operands[0])) {
-    // cosine(arg) is between -1 and 1. cosine(invalid arg) is NaN.
-    // ctpop() is between 0 and bitwidth, pick 0 for undef.
-    if (IntrinsicID == Intrinsic::cos ||
-        IntrinsicID == Intrinsic::ctpop)
-      return Constant::getNullValue(Ty);
-    if (IntrinsicID == Intrinsic::bswap ||
-        IntrinsicID == Intrinsic::bitreverse ||
-        IntrinsicID == Intrinsic::launder_invariant_group ||
-        IntrinsicID == Intrinsic::strip_invariant_group)
-      return Operands[0];
-  }
-
-  if (isa<ConstantPointerNull>(Operands[0])) {
-    // launder(null) == null == strip(null) iff in addrspace 0
-    if (IntrinsicID == Intrinsic::launder_invariant_group ||
-        IntrinsicID == Intrinsic::strip_invariant_group) {
-      // If instruction is not yet put in a basic block (e.g. when cloning
-      // a function during inlining), Call's caller may not be available.
-      // So check Call's BB first before querying Call->getCaller.
-      const Function *Caller =
-          Call->getParent() ? Call->getCaller() : nullptr;
-      if (Caller &&
-          !NullPointerIsDefined(
-              Caller, Operands[0]->getType()->getPointerAddressSpace())) {
-        return Operands[0];
-      }
-      return nullptr;
-    }
-  }
-
-  if (auto *Op = dyn_cast<ConstantFP>(Operands[0])) {
-    if (IntrinsicID == Intrinsic::convert_to_fp16) {
-      APFloat Val(Op->getValueAPF());
-
-      bool lost = false;
-      Val.convert(APFloat::IEEEhalf(), APFloat::rmNearestTiesToEven, &lost);
-
-      return ConstantInt::get(Ty->getContext(), Val.bitcastToAPInt());
-    }
-
-    if (!Ty->isHalfTy() && !Ty->isFloatTy() && !Ty->isDoubleTy())
-      return nullptr;
-
-    if (IntrinsicID == Intrinsic::round) {
-      APFloat V = Op->getValueAPF();
-      V.roundToIntegral(APFloat::rmNearestTiesToAway);
-      return ConstantFP::get(Ty->getContext(), V);
-    }
-
-    if (IntrinsicID == Intrinsic::floor) {
-      APFloat V = Op->getValueAPF();
-      V.roundToIntegral(APFloat::rmTowardNegative);
-      return ConstantFP::get(Ty->getContext(), V);
-    }
-
-    if (IntrinsicID == Intrinsic::ceil) {
-      APFloat V = Op->getValueAPF();
-      V.roundToIntegral(APFloat::rmTowardPositive);
-      return ConstantFP::get(Ty->getContext(), V);
-    }
-
-    if (IntrinsicID == Intrinsic::trunc) {
-      APFloat V = Op->getValueAPF();
-      V.roundToIntegral(APFloat::rmTowardZero);
-      return ConstantFP::get(Ty->getContext(), V);
-    }
-
-    if (IntrinsicID == Intrinsic::rint) {
-      APFloat V = Op->getValueAPF();
-      V.roundToIntegral(APFloat::rmNearestTiesToEven);
-      return ConstantFP::get(Ty->getContext(), V);
-    }
-
-    if (IntrinsicID == Intrinsic::nearbyint) {
-      APFloat V = Op->getValueAPF();
-      V.roundToIntegral(APFloat::rmNearestTiesToEven);
-      return ConstantFP::get(Ty->getContext(), V);
-    }
-
-    /// We only fold functions with finite arguments. Folding NaN and inf is
-    /// likely to be aborted with an exception anyway, and some host libms
-    /// have known errors raising exceptions.
-    if (Op->getValueAPF().isNaN() || Op->getValueAPF().isInfinity())
-      return nullptr;
-
-    /// Currently APFloat versions of these functions do not exist, so we use
-    /// the host native double versions.  Float versions are not called
-    /// directly but for all these it is true (float)(f((double)arg)) ==
-    /// f(arg).  Long double not supported yet.
-    double V = getValueAsDouble(Op);
-
-    switch (IntrinsicID) {
-      default: break;
-      case Intrinsic::fabs:
-        return ConstantFoldFP(fabs, V, Ty);
-      case Intrinsic::log2:
-        return ConstantFoldFP(Log2, V, Ty);
-      case Intrinsic::log:
-        return ConstantFoldFP(log, V, Ty);
-      case Intrinsic::log10:
-        return ConstantFoldFP(log10, V, Ty);
-      case Intrinsic::exp:
-        return ConstantFoldFP(exp, V, Ty);
-      case Intrinsic::exp2:
-        return ConstantFoldFP(exp2, V, Ty);
-      case Intrinsic::sin:
-        return ConstantFoldFP(sin, V, Ty);
-      case Intrinsic::cos:
-        return ConstantFoldFP(cos, V, Ty);
-      case Intrinsic::sqrt:
-        return ConstantFoldFP(sqrt, V, Ty);
-    }
-
-    if (!TLI)
-      return nullptr;
-
-    char NameKeyChar = Name[0];
-    if (Name[0] == '_' && Name.size() > 2 && Name[1] == '_')
-      NameKeyChar = Name[2];
-
-    switch (NameKeyChar) {
-    case 'a':
-      if ((Name == "acos" && TLI->has(LibFunc_acos)) ||
-          (Name == "acosf" && TLI->has(LibFunc_acosf)) ||
-          (Name == "__acos_finite" && TLI->has(LibFunc_acos_finite)) ||
-          (Name == "__acosf_finite" && TLI->has(LibFunc_acosf_finite)))
-        return ConstantFoldFP(acos, V, Ty);
-      else if ((Name == "asin" && TLI->has(LibFunc_asin)) ||
-               (Name == "asinf" && TLI->has(LibFunc_asinf)) ||
-               (Name == "__asin_finite" && TLI->has(LibFunc_asin_finite)) ||
-               (Name == "__asinf_finite" && TLI->has(LibFunc_asinf_finite)))
-        return ConstantFoldFP(asin, V, Ty);
-      else if ((Name == "atan" && TLI->has(LibFunc_atan)) ||
-               (Name == "atanf" && TLI->has(LibFunc_atanf)))
-        return ConstantFoldFP(atan, V, Ty);
-      break;
-    case 'c':
-      if ((Name == "ceil" && TLI->has(LibFunc_ceil)) ||
-          (Name == "ceilf" && TLI->has(LibFunc_ceilf)))
-        return ConstantFoldFP(ceil, V, Ty);
-      else if ((Name == "cos" && TLI->has(LibFunc_cos)) ||
-               (Name == "cosf" && TLI->has(LibFunc_cosf)))
-        return ConstantFoldFP(cos, V, Ty);
-      else if ((Name == "cosh" && TLI->has(LibFunc_cosh)) ||
-               (Name == "coshf" && TLI->has(LibFunc_coshf)) ||
-               (Name == "__cosh_finite" && TLI->has(LibFunc_cosh_finite)) ||
-               (Name == "__coshf_finite" && TLI->has(LibFunc_coshf_finite)))
-        return ConstantFoldFP(cosh, V, Ty);
-      break;
-    case 'e':
-      if ((Name == "exp" && TLI->has(LibFunc_exp)) ||
-          (Name == "expf" && TLI->has(LibFunc_expf)) ||
-          (Name == "__exp_finite" && TLI->has(LibFunc_exp_finite)) ||
-          (Name == "__expf_finite" && TLI->has(LibFunc_expf_finite)))
-        return ConstantFoldFP(exp, V, Ty);
-      if ((Name == "exp2" && TLI->has(LibFunc_exp2)) ||
-          (Name == "exp2f" && TLI->has(LibFunc_exp2f)) ||
-          (Name == "__exp2_finite" && TLI->has(LibFunc_exp2_finite)) ||
-          (Name == "__exp2f_finite" && TLI->has(LibFunc_exp2f_finite)))
-        // Constant fold exp2(x) as pow(2,x) in case the host doesn't have a
-        // C99 library.
-        return ConstantFoldBinaryFP(pow, 2.0, V, Ty);
-      break;
-    case 'f':
-      if ((Name == "fabs" && TLI->has(LibFunc_fabs)) ||
-          (Name == "fabsf" && TLI->has(LibFunc_fabsf)))
-        return ConstantFoldFP(fabs, V, Ty);
-      else if ((Name == "floor" && TLI->has(LibFunc_floor)) ||
-               (Name == "floorf" && TLI->has(LibFunc_floorf)))
-        return ConstantFoldFP(floor, V, Ty);
-      break;
-    case 'l':
-      if ((Name == "log" && V > 0 && TLI->has(LibFunc_log)) ||
-          (Name == "logf" && V > 0 && TLI->has(LibFunc_logf)) ||
-          (Name == "__log_finite" && V > 0 &&
-            TLI->has(LibFunc_log_finite)) ||
-          (Name == "__logf_finite" && V > 0 &&
-            TLI->has(LibFunc_logf_finite)))
-        return ConstantFoldFP(log, V, Ty);
-      else if ((Name == "log10" && V > 0 && TLI->has(LibFunc_log10)) ||
-               (Name == "log10f" && V > 0 && TLI->has(LibFunc_log10f)) ||
-               (Name == "__log10_finite" && V > 0 &&
-                 TLI->has(LibFunc_log10_finite)) ||
-               (Name == "__log10f_finite" && V > 0 &&
-                 TLI->has(LibFunc_log10f_finite)))
-        return ConstantFoldFP(log10, V, Ty);
-      break;
-    case 'r':
-      if ((Name == "round" && TLI->has(LibFunc_round)) ||
-          (Name == "roundf" && TLI->has(LibFunc_roundf)))
-        return ConstantFoldFP(round, V, Ty);
-      break;
-    case 's':
-      if ((Name == "sin" && TLI->has(LibFunc_sin)) ||
-          (Name == "sinf" && TLI->has(LibFunc_sinf)))
-        return ConstantFoldFP(sin, V, Ty);
-      else if ((Name == "sinh" && TLI->has(LibFunc_sinh)) ||
-               (Name == "sinhf" && TLI->has(LibFunc_sinhf)) ||
-               (Name == "__sinh_finite" && TLI->has(LibFunc_sinh_finite)) ||
-               (Name == "__sinhf_finite" && TLI->has(LibFunc_sinhf_finite)))
-        return ConstantFoldFP(sinh, V, Ty);
-      else if ((Name == "sqrt" && V >= 0 && TLI->has(LibFunc_sqrt)) ||
-               (Name == "sqrtf" && V >= 0 && TLI->has(LibFunc_sqrtf)))
-        return ConstantFoldFP(sqrt, V, Ty);
-      break;
-    case 't':
-      if ((Name == "tan" && TLI->has(LibFunc_tan)) ||
-          (Name == "tanf" && TLI->has(LibFunc_tanf)))
-        return ConstantFoldFP(tan, V, Ty);
-      else if ((Name == "tanh" && TLI->has(LibFunc_tanh)) ||
-               (Name == "tanhf" && TLI->has(LibFunc_tanhf)))
-        return ConstantFoldFP(tanh, V, Ty);
-      break;
-    default:
-      break;
-    }
-    return nullptr;
-  }
-
-  if (auto *Op = dyn_cast<ConstantInt>(Operands[0])) {
-    switch (IntrinsicID) {
-    case Intrinsic::bswap:
-      return ConstantInt::get(Ty->getContext(), Op->getValue().byteSwap());
-    case Intrinsic::ctpop:
-      return ConstantInt::get(Ty, Op->getValue().countPopulation());
-    case Intrinsic::bitreverse:
-      return ConstantInt::get(Ty->getContext(), Op->getValue().reverseBits());
-    case Intrinsic::convert_from_fp16: {
-      APFloat Val(APFloat::IEEEhalf(), Op->getValue());
-
-      bool lost = false;
-      APFloat::opStatus status = Val.convert(
-          Ty->getFltSemantics(), APFloat::rmNearestTiesToEven, &lost);
-
-      // Conversion is always precise.
-      (void)status;
-      assert(status == APFloat::opOK && !lost &&
-             "Precision lost during fp16 constfolding");
-
-      return ConstantFP::get(Ty->getContext(), Val);
-    }
-    default:
-      return nullptr;
-    }
-  }
-
-  // Support ConstantVector in case we have an Undef in the top.
-  if (isa<ConstantVector>(Operands[0]) ||
-      isa<ConstantDataVector>(Operands[0])) {
-    auto *Op = cast<Constant>(Operands[0]);
-    switch (IntrinsicID) {
-    default: break;
-    case Intrinsic::x86_sse_cvtss2si:
-    case Intrinsic::x86_sse_cvtss2si64:
-    case Intrinsic::x86_sse2_cvtsd2si:
-    case Intrinsic::x86_sse2_cvtsd2si64:
-      if (ConstantFP *FPOp =
-              dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U)))
-        return ConstantFoldSSEConvertToInt(FPOp->getValueAPF(),
-                                           /*roundTowardZero=*/false, Ty,
-                                           /*IsSigned*/true);
-      break;
-    case Intrinsic::x86_sse_cvttss2si:
-    case Intrinsic::x86_sse_cvttss2si64:
-    case Intrinsic::x86_sse2_cvttsd2si:
-    case Intrinsic::x86_sse2_cvttsd2si64:
-      if (ConstantFP *FPOp =
-              dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U)))
-        return ConstantFoldSSEConvertToInt(FPOp->getValueAPF(),
-                                           /*roundTowardZero=*/true, Ty,
-                                           /*IsSigned*/true);
-      break;
-    }
-  }
-
-  return nullptr;
-}
-
-static Constant *ConstantFoldScalarCall2(StringRef Name,
-                                         Intrinsic::ID IntrinsicID,
-                                         Type *Ty,
-                                         ArrayRef<Constant *> Operands,
-                                         const TargetLibraryInfo *TLI,
-                                         const CallBase *Call) {
-  assert(Operands.size() == 2 && "Wrong number of operands.");
-
-  if (auto *Op1 = dyn_cast<ConstantFP>(Operands[0])) {
-    if (!Ty->isHalfTy() && !Ty->isFloatTy() && !Ty->isDoubleTy())
-      return nullptr;
-    double Op1V = getValueAsDouble(Op1);
-
-    if (auto *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
-      if (Op2->getType() != Op1->getType())
-        return nullptr;
-
-      double Op2V = getValueAsDouble(Op2);
-      if (IntrinsicID == Intrinsic::pow) {
-        return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
-      }
-      if (IntrinsicID == Intrinsic::copysign) {
-        APFloat V1 = Op1->getValueAPF();
-        const APFloat &V2 = Op2->getValueAPF();
-        V1.copySign(V2);
-        return ConstantFP::get(Ty->getContext(), V1);
-      }
-
-      if (IntrinsicID == Intrinsic::minnum) {
-        const APFloat &C1 = Op1->getValueAPF();
-        const APFloat &C2 = Op2->getValueAPF();
-        return ConstantFP::get(Ty->getContext(), minnum(C1, C2));
-      }
-
-      if (IntrinsicID == Intrinsic::maxnum) {
-        const APFloat &C1 = Op1->getValueAPF();
-        const APFloat &C2 = Op2->getValueAPF();
-        return ConstantFP::get(Ty->getContext(), maxnum(C1, C2));
-      }
-
-      if (IntrinsicID == Intrinsic::minimum) {
-        const APFloat &C1 = Op1->getValueAPF();
-        const APFloat &C2 = Op2->getValueAPF();
-        return ConstantFP::get(Ty->getContext(), minimum(C1, C2));
-      }
-
-      if (IntrinsicID == Intrinsic::maximum) {
-        const APFloat &C1 = Op1->getValueAPF();
-        const APFloat &C2 = Op2->getValueAPF();
-        return ConstantFP::get(Ty->getContext(), maximum(C1, C2));
-      }
-
-      if (!TLI)
-        return nullptr;
-      if ((Name == "pow" && TLI->has(LibFunc_pow)) ||
-          (Name == "powf" && TLI->has(LibFunc_powf)) ||
-          (Name == "__pow_finite" && TLI->has(LibFunc_pow_finite)) ||
-          (Name == "__powf_finite" && TLI->has(LibFunc_powf_finite)))
-        return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
-      if ((Name == "fmod" && TLI->has(LibFunc_fmod)) ||
-          (Name == "fmodf" && TLI->has(LibFunc_fmodf)))
-        return ConstantFoldBinaryFP(fmod, Op1V, Op2V, Ty);
-      if ((Name == "atan2" && TLI->has(LibFunc_atan2)) ||
-          (Name == "atan2f" && TLI->has(LibFunc_atan2f)) ||
-          (Name == "__atan2_finite" && TLI->has(LibFunc_atan2_finite)) ||
-          (Name == "__atan2f_finite" && TLI->has(LibFunc_atan2f_finite)))
-        return ConstantFoldBinaryFP(atan2, Op1V, Op2V, Ty);
-    } else if (auto *Op2C = dyn_cast<ConstantInt>(Operands[1])) {
-      if (IntrinsicID == Intrinsic::powi && Ty->isHalfTy())
-        return ConstantFP::get(Ty->getContext(),
-                               APFloat((float)std::pow((float)Op1V,
-                                               (int)Op2C->getZExtValue())));
-      if (IntrinsicID == Intrinsic::powi && Ty->isFloatTy())
-        return ConstantFP::get(Ty->getContext(),
-                               APFloat((float)std::pow((float)Op1V,
-                                               (int)Op2C->getZExtValue())));
-      if (IntrinsicID == Intrinsic::powi && Ty->isDoubleTy())
-        return ConstantFP::get(Ty->getContext(),
-                               APFloat((double)std::pow((double)Op1V,
-                                                 (int)Op2C->getZExtValue())));
-    }
-    return nullptr;
-  }
-
-  if (Operands[0]->getType()->isIntegerTy() &&
-      Operands[1]->getType()->isIntegerTy()) {
-    const APInt *C0, *C1;
-    if (!getConstIntOrUndef(Operands[0], C0) ||
-        !getConstIntOrUndef(Operands[1], C1))
-      return nullptr;
-
-    switch (IntrinsicID) {
-    default: break;
-    case Intrinsic::smul_with_overflow:
-    case Intrinsic::umul_with_overflow:
-      // Even if both operands are undef, we cannot fold muls to undef
-      // in the general case. For example, on i2 there are no inputs
-      // that would produce { i2 -1, i1 true } as the result.
-      if (!C0 || !C1)
-        return Constant::getNullValue(Ty);
-      LLVM_FALLTHROUGH;
-    case Intrinsic::sadd_with_overflow:
-    case Intrinsic::uadd_with_overflow:
-    case Intrinsic::ssub_with_overflow:
-    case Intrinsic::usub_with_overflow: {
-      if (!C0 || !C1)
-        return UndefValue::get(Ty);
-
-      APInt Res;
-      bool Overflow;
-      switch (IntrinsicID) {
-      default: llvm_unreachable("Invalid case");
-      case Intrinsic::sadd_with_overflow:
-        Res = C0->sadd_ov(*C1, Overflow);
-        break;
-      case Intrinsic::uadd_with_overflow:
-        Res = C0->uadd_ov(*C1, Overflow);
-        break;
-      case Intrinsic::ssub_with_overflow:
-        Res = C0->ssub_ov(*C1, Overflow);
-        break;
-      case Intrinsic::usub_with_overflow:
-        Res = C0->usub_ov(*C1, Overflow);
-        break;
-      case Intrinsic::smul_with_overflow:
-        Res = C0->smul_ov(*C1, Overflow);
-        break;
-      case Intrinsic::umul_with_overflow:
-        Res = C0->umul_ov(*C1, Overflow);
-        break;
-      }
-      Constant *Ops[] = {
-        ConstantInt::get(Ty->getContext(), Res),
-        ConstantInt::get(Type::getInt1Ty(Ty->getContext()), Overflow)
-      };
-      return ConstantStruct::get(cast<StructType>(Ty), Ops);
-    }
-    case Intrinsic::uadd_sat:
-    case Intrinsic::sadd_sat:
-      if (!C0 && !C1)
-        return UndefValue::get(Ty);
-      if (!C0 || !C1)
-        return Constant::getAllOnesValue(Ty);
-      if (IntrinsicID == Intrinsic::uadd_sat)
-        return ConstantInt::get(Ty, C0->uadd_sat(*C1));
-      else
-        return ConstantInt::get(Ty, C0->sadd_sat(*C1));
-    case Intrinsic::usub_sat:
-    case Intrinsic::ssub_sat:
-      if (!C0 && !C1)
-        return UndefValue::get(Ty);
-      if (!C0 || !C1)
-        return Constant::getNullValue(Ty);
-      if (IntrinsicID == Intrinsic::usub_sat)
-        return ConstantInt::get(Ty, C0->usub_sat(*C1));
-      else
-        return ConstantInt::get(Ty, C0->ssub_sat(*C1));
-    case Intrinsic::cttz:
-    case Intrinsic::ctlz:
-      assert(C1 && "Must be constant int");
-
-      // cttz(0, 1) and ctlz(0, 1) are undef.
-      if (C1->isOneValue() && (!C0 || C0->isNullValue()))
-        return UndefValue::get(Ty);
-      if (!C0)
-        return Constant::getNullValue(Ty);
-      if (IntrinsicID == Intrinsic::cttz)
-        return ConstantInt::get(Ty, C0->countTrailingZeros());
-      else
-        return ConstantInt::get(Ty, C0->countLeadingZeros());
-    }
-
-    return nullptr;
-  }
-
-  // Support ConstantVector in case we have an Undef in the top.
-  if ((isa<ConstantVector>(Operands[0]) ||
-       isa<ConstantDataVector>(Operands[0])) &&
-      // Check for default rounding mode.
-      // FIXME: Support other rounding modes?
-      isa<ConstantInt>(Operands[1]) &&
-      cast<ConstantInt>(Operands[1])->getValue() == 4) {
-    auto *Op = cast<Constant>(Operands[0]);
-    switch (IntrinsicID) {
-    default: break;
-    case Intrinsic::x86_avx512_vcvtss2si32:
-    case Intrinsic::x86_avx512_vcvtss2si64:
-    case Intrinsic::x86_avx512_vcvtsd2si32:
-    case Intrinsic::x86_avx512_vcvtsd2si64:
-      if (ConstantFP *FPOp =
-              dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U)))
-        return ConstantFoldSSEConvertToInt(FPOp->getValueAPF(),
-                                           /*roundTowardZero=*/false, Ty,
-                                           /*IsSigned*/true);
-      break;
-    case Intrinsic::x86_avx512_vcvtss2usi32:
-    case Intrinsic::x86_avx512_vcvtss2usi64:
-    case Intrinsic::x86_avx512_vcvtsd2usi32:
-    case Intrinsic::x86_avx512_vcvtsd2usi64:
-      if (ConstantFP *FPOp =
-              dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U)))
-        return ConstantFoldSSEConvertToInt(FPOp->getValueAPF(),
-                                           /*roundTowardZero=*/false, Ty,
-                                           /*IsSigned*/false);
-      break;
-    case Intrinsic::x86_avx512_cvttss2si:
-    case Intrinsic::x86_avx512_cvttss2si64:
-    case Intrinsic::x86_avx512_cvttsd2si:
-    case Intrinsic::x86_avx512_cvttsd2si64:
-      if (ConstantFP *FPOp =
-              dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U)))
-        return ConstantFoldSSEConvertToInt(FPOp->getValueAPF(),
-                                           /*roundTowardZero=*/true, Ty,
-                                           /*IsSigned*/true);
-      break;
-    case Intrinsic::x86_avx512_cvttss2usi:
-    case Intrinsic::x86_avx512_cvttss2usi64:
-    case Intrinsic::x86_avx512_cvttsd2usi:
-    case Intrinsic::x86_avx512_cvttsd2usi64:
-      if (ConstantFP *FPOp =
-              dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U)))
-        return ConstantFoldSSEConvertToInt(FPOp->getValueAPF(),
-                                           /*roundTowardZero=*/true, Ty,
-                                           /*IsSigned*/false);
-      break;
-    }
-  }
-  return nullptr;
-}
-
-static Constant *ConstantFoldScalarCall3(StringRef Name,
-                                         Intrinsic::ID IntrinsicID,
-                                         Type *Ty,
-                                         ArrayRef<Constant *> Operands,
-                                         const TargetLibraryInfo *TLI,
-                                         const CallBase *Call) {
-  assert(Operands.size() == 3 && "Wrong number of operands.");
-
-  if (const auto *Op1 = dyn_cast<ConstantFP>(Operands[0])) {
-    if (const auto *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
-      if (const auto *Op3 = dyn_cast<ConstantFP>(Operands[2])) {
-        switch (IntrinsicID) {
-        default: break;
-        case Intrinsic::fma:
-        case Intrinsic::fmuladd: {
-          APFloat V = Op1->getValueAPF();
-          APFloat::opStatus s = V.fusedMultiplyAdd(Op2->getValueAPF(),
-                                                   Op3->getValueAPF(),
-                                                   APFloat::rmNearestTiesToEven);
-          if (s != APFloat::opInvalidOp)
-            return ConstantFP::get(Ty->getContext(), V);
-
-          return nullptr;
-        }
-        }
-      }
-    }
-  }
-
-  if (const auto *Op1 = dyn_cast<ConstantInt>(Operands[0])) {
-    if (const auto *Op2 = dyn_cast<ConstantInt>(Operands[1])) {
-      if (const auto *Op3 = dyn_cast<ConstantInt>(Operands[2])) {
-        switch (IntrinsicID) {
-        default: break;
-        case Intrinsic::smul_fix:
-        case Intrinsic::smul_fix_sat: {
-          // This code performs rounding towards negative infinity in case the
-          // result cannot be represented exactly for the given scale. Targets
-          // that do care about rounding should use a target hook for specifying
-          // how rounding should be done, and provide their own folding to be
-          // consistent with rounding. This is the same approach as used by
-          // DAGTypeLegalizer::ExpandIntRes_MULFIX.
-          APInt Lhs = Op1->getValue();
-          APInt Rhs = Op2->getValue();
-          unsigned Scale = Op3->getValue().getZExtValue();
-          unsigned Width = Lhs.getBitWidth();
-          assert(Scale < Width && "Illegal scale.");
-          unsigned ExtendedWidth = Width * 2;
-          APInt Product = (Lhs.sextOrSelf(ExtendedWidth) *
-                           Rhs.sextOrSelf(ExtendedWidth)).ashr(Scale);
-          if (IntrinsicID == Intrinsic::smul_fix_sat) {
-            APInt MaxValue =
-              APInt::getSignedMaxValue(Width).sextOrSelf(ExtendedWidth);
-            APInt MinValue =
-              APInt::getSignedMinValue(Width).sextOrSelf(ExtendedWidth);
-            Product = APIntOps::smin(Product, MaxValue);
-            Product = APIntOps::smax(Product, MinValue);
-          }
-          return ConstantInt::get(Ty->getContext(),
-                                  Product.sextOrTrunc(Width));
-        }
-        }
-      }
-    }
-  }
-
-  if (IntrinsicID == Intrinsic::fshl || IntrinsicID == Intrinsic::fshr) {
-    const APInt *C0, *C1, *C2;
-    if (!getConstIntOrUndef(Operands[0], C0) ||
-        !getConstIntOrUndef(Operands[1], C1) ||
-        !getConstIntOrUndef(Operands[2], C2))
-      return nullptr;
-
-    bool IsRight = IntrinsicID == Intrinsic::fshr;
-    if (!C2)
-      return Operands[IsRight ? 1 : 0];
-    if (!C0 && !C1)
-      return UndefValue::get(Ty);
-
-    // The shift amount is interpreted as modulo the bitwidth. If the shift
-    // amount is effectively 0, avoid UB due to oversized inverse shift below.
-    unsigned BitWidth = C2->getBitWidth();
-    unsigned ShAmt = C2->urem(BitWidth);
-    if (!ShAmt)
-      return Operands[IsRight ? 1 : 0];
-
-    // (C0 << ShlAmt) | (C1 >> LshrAmt)
-    unsigned LshrAmt = IsRight ? ShAmt : BitWidth - ShAmt;
-    unsigned ShlAmt = !IsRight ? ShAmt : BitWidth - ShAmt;
-    if (!C0)
-      return ConstantInt::get(Ty, C1->lshr(LshrAmt));
-    if (!C1)
-      return ConstantInt::get(Ty, C0->shl(ShlAmt));
-    return ConstantInt::get(Ty, C0->shl(ShlAmt) | C1->lshr(LshrAmt));
-  }
-
-  return nullptr;
-}
-
-static Constant *ConstantFoldScalarCall(StringRef Name,
-                                        Intrinsic::ID IntrinsicID,
-                                        Type *Ty,
-                                        ArrayRef<Constant *> Operands,
-                                        const TargetLibraryInfo *TLI,
-                                        const CallBase *Call) {
-  if (Operands.size() == 1)
-    return ConstantFoldScalarCall1(Name, IntrinsicID, Ty, Operands, TLI, Call);
-
-  if (Operands.size() == 2)
-    return ConstantFoldScalarCall2(Name, IntrinsicID, Ty, Operands, TLI, Call);
-
-  if (Operands.size() == 3)
-    return ConstantFoldScalarCall3(Name, IntrinsicID, Ty, Operands, TLI, Call);
-
-  return nullptr;
-}
-
-static Constant *ConstantFoldVectorCall(StringRef Name,
-                                        Intrinsic::ID IntrinsicID,
-                                        VectorType *VTy,
-                                        ArrayRef<Constant *> Operands,
-                                        const DataLayout &DL,
-                                        const TargetLibraryInfo *TLI,
-                                        const CallBase *Call) {
-  SmallVector<Constant *, 4> Result(VTy->getNumElements());
-  SmallVector<Constant *, 4> Lane(Operands.size());
-  Type *Ty = VTy->getElementType();
-
-  if (IntrinsicID == Intrinsic::masked_load) {
-    auto *SrcPtr = Operands[0];
-    auto *Mask = Operands[2];
-    auto *Passthru = Operands[3];
-
-    Constant *VecData = ConstantFoldLoadFromConstPtr(SrcPtr, VTy, DL);
-
-    SmallVector<Constant *, 32> NewElements;
-    for (unsigned I = 0, E = VTy->getNumElements(); I != E; ++I) {
-      auto *MaskElt = Mask->getAggregateElement(I);
-      if (!MaskElt)
-        break;
-      auto *PassthruElt = Passthru->getAggregateElement(I);
-      auto *VecElt = VecData ? VecData->getAggregateElement(I) : nullptr;
-      if (isa<UndefValue>(MaskElt)) {
-        if (PassthruElt)
-          NewElements.push_back(PassthruElt);
-        else if (VecElt)
-          NewElements.push_back(VecElt);
-        else
-          return nullptr;
-      }
-      if (MaskElt->isNullValue()) {
-        if (!PassthruElt)
-          return nullptr;
-        NewElements.push_back(PassthruElt);
-      } else if (MaskElt->isOneValue()) {
-        if (!VecElt)
-          return nullptr;
-        NewElements.push_back(VecElt);
-      } else {
-        return nullptr;
-      }
-    }
-    if (NewElements.size() != VTy->getNumElements())
-      return nullptr;
-    return ConstantVector::get(NewElements);
-  }
-
-  for (unsigned I = 0, E = VTy->getNumElements(); I != E; ++I) {
-    // Gather a column of constants.
-    for (unsigned J = 0, JE = Operands.size(); J != JE; ++J) {
-      // Some intrinsics use a scalar type for certain arguments.
-      if (hasVectorInstrinsicScalarOpd(IntrinsicID, J)) {
-        Lane[J] = Operands[J];
-        continue;
-      }
-
-      Constant *Agg = Operands[J]->getAggregateElement(I);
-      if (!Agg)
-        return nullptr;
-
-      Lane[J] = Agg;
-    }
-
-    // Use the regular scalar folding to simplify this column.
-    Constant *Folded =
-        ConstantFoldScalarCall(Name, IntrinsicID, Ty, Lane, TLI, Call);
-    if (!Folded)
-      return nullptr;
-    Result[I] = Folded;
-  }
-
-  return ConstantVector::get(Result);
-}
-
-} // end anonymous namespace
-
-Constant *llvm::ConstantFoldCall(const CallBase *Call, Function *F,
-                                 ArrayRef<Constant *> Operands,
-                                 const TargetLibraryInfo *TLI) {
-  if (Call->isNoBuiltin() || Call->isStrictFP())
-    return nullptr;
-  if (!F->hasName())
-    return nullptr;
-  StringRef Name = F->getName();
-
-  Type *Ty = F->getReturnType();
-
-  if (auto *VTy = dyn_cast<VectorType>(Ty))
-    return ConstantFoldVectorCall(Name, F->getIntrinsicID(), VTy, Operands,
-                                  F->getParent()->getDataLayout(), TLI, Call);
-
-  return ConstantFoldScalarCall(Name, F->getIntrinsicID(), Ty, Operands, TLI,
-                                Call);
-}
-
-bool llvm::isMathLibCallNoop(const CallBase *Call,
-                             const TargetLibraryInfo *TLI) {
-  // FIXME: Refactor this code; this duplicates logic in LibCallsShrinkWrap
-  // (and to some extent ConstantFoldScalarCall).
-  if (Call->isNoBuiltin() || Call->isStrictFP())
-    return false;
-  Function *F = Call->getCalledFunction();
-  if (!F)
-    return false;
-
-  LibFunc Func;
-  if (!TLI || !TLI->getLibFunc(*F, Func))
-    return false;
-
-  if (Call->getNumArgOperands() == 1) {
-    if (ConstantFP *OpC = dyn_cast<ConstantFP>(Call->getArgOperand(0))) {
-      const APFloat &Op = OpC->getValueAPF();
-      switch (Func) {
-      case LibFunc_logl:
-      case LibFunc_log:
-      case LibFunc_logf:
-      case LibFunc_log2l:
-      case LibFunc_log2:
-      case LibFunc_log2f:
-      case LibFunc_log10l:
-      case LibFunc_log10:
-      case LibFunc_log10f:
-        return Op.isNaN() || (!Op.isZero() && !Op.isNegative());
-
-      case LibFunc_expl:
-      case LibFunc_exp:
-      case LibFunc_expf:
-        // FIXME: These boundaries are slightly conservative.
-        if (OpC->getType()->isDoubleTy())
-          return Op.compare(APFloat(-745.0)) != APFloat::cmpLessThan &&
-                 Op.compare(APFloat(709.0)) != APFloat::cmpGreaterThan;
-        if (OpC->getType()->isFloatTy())
-          return Op.compare(APFloat(-103.0f)) != APFloat::cmpLessThan &&
-                 Op.compare(APFloat(88.0f)) != APFloat::cmpGreaterThan;
-        break;
-
-      case LibFunc_exp2l:
-      case LibFunc_exp2:
-      case LibFunc_exp2f:
-        // FIXME: These boundaries are slightly conservative.
-        if (OpC->getType()->isDoubleTy())
-          return Op.compare(APFloat(-1074.0)) != APFloat::cmpLessThan &&
-                 Op.compare(APFloat(1023.0)) != APFloat::cmpGreaterThan;
-        if (OpC->getType()->isFloatTy())
-          return Op.compare(APFloat(-149.0f)) != APFloat::cmpLessThan &&
-                 Op.compare(APFloat(127.0f)) != APFloat::cmpGreaterThan;
-        break;
-
-      case LibFunc_sinl:
-      case LibFunc_sin:
-      case LibFunc_sinf:
-      case LibFunc_cosl:
-      case LibFunc_cos:
-      case LibFunc_cosf:
-        return !Op.isInfinity();
-
-      case LibFunc_tanl:
-      case LibFunc_tan:
-      case LibFunc_tanf: {
-        // FIXME: Stop using the host math library.
-        // FIXME: The computation isn't done in the right precision.
-        Type *Ty = OpC->getType();
-        if (Ty->isDoubleTy() || Ty->isFloatTy() || Ty->isHalfTy()) {
-          double OpV = getValueAsDouble(OpC);
-          return ConstantFoldFP(tan, OpV, Ty) != nullptr;
-        }
-        break;
-      }
-
-      case LibFunc_asinl:
-      case LibFunc_asin:
-      case LibFunc_asinf:
-      case LibFunc_acosl:
-      case LibFunc_acos:
-      case LibFunc_acosf:
-        return Op.compare(APFloat(Op.getSemantics(), "-1")) !=
-                   APFloat::cmpLessThan &&
-               Op.compare(APFloat(Op.getSemantics(), "1")) !=
-                   APFloat::cmpGreaterThan;
-
-      case LibFunc_sinh:
-      case LibFunc_cosh:
-      case LibFunc_sinhf:
-      case LibFunc_coshf:
-      case LibFunc_sinhl:
-      case LibFunc_coshl:
-        // FIXME: These boundaries are slightly conservative.
-        if (OpC->getType()->isDoubleTy())
-          return Op.compare(APFloat(-710.0)) != APFloat::cmpLessThan &&
-                 Op.compare(APFloat(710.0)) != APFloat::cmpGreaterThan;
-        if (OpC->getType()->isFloatTy())
-          return Op.compare(APFloat(-89.0f)) != APFloat::cmpLessThan &&
-                 Op.compare(APFloat(89.0f)) != APFloat::cmpGreaterThan;
-        break;
-
-      case LibFunc_sqrtl:
-      case LibFunc_sqrt:
-      case LibFunc_sqrtf:
-        return Op.isNaN() || Op.isZero() || !Op.isNegative();
-
-      // FIXME: Add more functions: sqrt_finite, atanh, expm1, log1p,
-      // maybe others?
-      default:
-        break;
-      }
-    }
-  }
-
-  if (Call->getNumArgOperands() == 2) {
-    ConstantFP *Op0C = dyn_cast<ConstantFP>(Call->getArgOperand(0));
-    ConstantFP *Op1C = dyn_cast<ConstantFP>(Call->getArgOperand(1));
-    if (Op0C && Op1C) {
-      const APFloat &Op0 = Op0C->getValueAPF();
-      const APFloat &Op1 = Op1C->getValueAPF();
-
-      switch (Func) {
-      case LibFunc_powl:
-      case LibFunc_pow:
-      case LibFunc_powf: {
-        // FIXME: Stop using the host math library.
-        // FIXME: The computation isn't done in the right precision.
-        Type *Ty = Op0C->getType();
-        if (Ty->isDoubleTy() || Ty->isFloatTy() || Ty->isHalfTy()) {
-          if (Ty == Op1C->getType()) {
-            double Op0V = getValueAsDouble(Op0C);
-            double Op1V = getValueAsDouble(Op1C);
-            return ConstantFoldBinaryFP(pow, Op0V, Op1V, Ty) != nullptr;
-          }
-        }
-        break;
-      }
-
-      case LibFunc_fmodl:
-      case LibFunc_fmod:
-      case LibFunc_fmodf:
-        return Op0.isNaN() || Op1.isNaN() ||
-               (!Op0.isInfinity() && !Op1.isZero());
-
-      default:
-        break;
-      }
-    }
-  }
-
-  return false;
-}