forked from OSchip/llvm-project
2175 lines
78 KiB
C++
2175 lines
78 KiB
C++
//===-- Constants.cpp - Implement Constant nodes --------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Constant* classes.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Constants.h"
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#include "LLVMContextImpl.h"
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#include "ConstantFold.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/Operator.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/STLExtras.h"
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#include <algorithm>
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#include <cstdarg>
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Constant Class
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//===----------------------------------------------------------------------===//
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bool Constant::isNegativeZeroValue() const {
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// Floating point values have an explicit -0.0 value.
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if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
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return CFP->isZero() && CFP->isNegative();
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// Otherwise, just use +0.0.
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return isNullValue();
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}
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bool Constant::isNullValue() const {
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// 0 is null.
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
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return CI->isZero();
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// +0.0 is null.
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if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
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return CFP->isZero() && !CFP->isNegative();
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// constant zero is zero for aggregates and cpnull is null for pointers.
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return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this);
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}
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bool Constant::isAllOnesValue() const {
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// Check for -1 integers
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
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return CI->isMinusOne();
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// Check for FP which are bitcasted from -1 integers
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if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
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return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
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// Check for constant vectors
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if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
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return CV->isAllOnesValue();
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return false;
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}
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// Constructor to create a '0' constant of arbitrary type...
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Constant *Constant::getNullValue(Type *Ty) {
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switch (Ty->getTypeID()) {
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case Type::IntegerTyID:
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return ConstantInt::get(Ty, 0);
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case Type::FloatTyID:
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return ConstantFP::get(Ty->getContext(),
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APFloat::getZero(APFloat::IEEEsingle));
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case Type::DoubleTyID:
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return ConstantFP::get(Ty->getContext(),
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APFloat::getZero(APFloat::IEEEdouble));
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case Type::X86_FP80TyID:
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return ConstantFP::get(Ty->getContext(),
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APFloat::getZero(APFloat::x87DoubleExtended));
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case Type::FP128TyID:
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return ConstantFP::get(Ty->getContext(),
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APFloat::getZero(APFloat::IEEEquad));
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case Type::PPC_FP128TyID:
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return ConstantFP::get(Ty->getContext(),
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APFloat(APInt::getNullValue(128)));
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case Type::PointerTyID:
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return ConstantPointerNull::get(cast<PointerType>(Ty));
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case Type::StructTyID:
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case Type::ArrayTyID:
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case Type::VectorTyID:
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return ConstantAggregateZero::get(Ty);
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default:
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// Function, Label, or Opaque type?
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assert(0 && "Cannot create a null constant of that type!");
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return 0;
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}
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}
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Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
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Type *ScalarTy = Ty->getScalarType();
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// Create the base integer constant.
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Constant *C = ConstantInt::get(Ty->getContext(), V);
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// Convert an integer to a pointer, if necessary.
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if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
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C = ConstantExpr::getIntToPtr(C, PTy);
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// Broadcast a scalar to a vector, if necessary.
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if (VectorType *VTy = dyn_cast<VectorType>(Ty))
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C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
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return C;
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}
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Constant *Constant::getAllOnesValue(Type *Ty) {
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if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
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return ConstantInt::get(Ty->getContext(),
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APInt::getAllOnesValue(ITy->getBitWidth()));
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if (Ty->isFloatingPointTy()) {
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APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
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!Ty->isPPC_FP128Ty());
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return ConstantFP::get(Ty->getContext(), FL);
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}
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SmallVector<Constant*, 16> Elts;
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VectorType *VTy = cast<VectorType>(Ty);
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Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
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assert(Elts[0] && "Invalid AllOnes value!");
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return cast<ConstantVector>(ConstantVector::get(Elts));
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}
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void Constant::destroyConstantImpl() {
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// When a Constant is destroyed, there may be lingering
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// references to the constant by other constants in the constant pool. These
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// constants are implicitly dependent on the module that is being deleted,
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// but they don't know that. Because we only find out when the CPV is
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// deleted, we must now notify all of our users (that should only be
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// Constants) that they are, in fact, invalid now and should be deleted.
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//
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while (!use_empty()) {
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Value *V = use_back();
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#ifndef NDEBUG // Only in -g mode...
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if (!isa<Constant>(V)) {
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dbgs() << "While deleting: " << *this
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<< "\n\nUse still stuck around after Def is destroyed: "
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<< *V << "\n\n";
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}
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#endif
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assert(isa<Constant>(V) && "References remain to Constant being destroyed");
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Constant *CV = cast<Constant>(V);
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CV->destroyConstant();
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// The constant should remove itself from our use list...
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assert((use_empty() || use_back() != V) && "Constant not removed!");
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}
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// Value has no outstanding references it is safe to delete it now...
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delete this;
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}
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/// canTrap - Return true if evaluation of this constant could trap. This is
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/// true for things like constant expressions that could divide by zero.
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bool Constant::canTrap() const {
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assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
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// The only thing that could possibly trap are constant exprs.
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const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
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if (!CE) return false;
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// ConstantExpr traps if any operands can trap.
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for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
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if (CE->getOperand(i)->canTrap())
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return true;
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// Otherwise, only specific operations can trap.
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switch (CE->getOpcode()) {
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default:
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return false;
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case Instruction::UDiv:
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case Instruction::SDiv:
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case Instruction::FDiv:
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case Instruction::URem:
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case Instruction::SRem:
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case Instruction::FRem:
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// Div and rem can trap if the RHS is not known to be non-zero.
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if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
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return true;
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return false;
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}
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}
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/// isConstantUsed - Return true if the constant has users other than constant
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/// exprs and other dangling things.
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bool Constant::isConstantUsed() const {
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for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
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const Constant *UC = dyn_cast<Constant>(*UI);
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if (UC == 0 || isa<GlobalValue>(UC))
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return true;
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if (UC->isConstantUsed())
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return true;
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}
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return false;
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}
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/// getRelocationInfo - This method classifies the entry according to
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/// whether or not it may generate a relocation entry. This must be
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/// conservative, so if it might codegen to a relocatable entry, it should say
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/// so. The return values are:
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///
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/// NoRelocation: This constant pool entry is guaranteed to never have a
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/// relocation applied to it (because it holds a simple constant like
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/// '4').
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/// LocalRelocation: This entry has relocations, but the entries are
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/// guaranteed to be resolvable by the static linker, so the dynamic
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/// linker will never see them.
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/// GlobalRelocations: This entry may have arbitrary relocations.
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///
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/// FIXME: This really should not be in VMCore.
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Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
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if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
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if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
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return LocalRelocation; // Local to this file/library.
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return GlobalRelocations; // Global reference.
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}
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if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
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return BA->getFunction()->getRelocationInfo();
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// While raw uses of blockaddress need to be relocated, differences between
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// two of them don't when they are for labels in the same function. This is a
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// common idiom when creating a table for the indirect goto extension, so we
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// handle it efficiently here.
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if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
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if (CE->getOpcode() == Instruction::Sub) {
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ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
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ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
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if (LHS && RHS &&
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LHS->getOpcode() == Instruction::PtrToInt &&
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RHS->getOpcode() == Instruction::PtrToInt &&
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isa<BlockAddress>(LHS->getOperand(0)) &&
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isa<BlockAddress>(RHS->getOperand(0)) &&
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cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
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cast<BlockAddress>(RHS->getOperand(0))->getFunction())
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return NoRelocation;
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}
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PossibleRelocationsTy Result = NoRelocation;
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for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
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Result = std::max(Result,
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cast<Constant>(getOperand(i))->getRelocationInfo());
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return Result;
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}
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/// getVectorElements - This method, which is only valid on constant of vector
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/// type, returns the elements of the vector in the specified smallvector.
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/// This handles breaking down a vector undef into undef elements, etc. For
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/// constant exprs and other cases we can't handle, we return an empty vector.
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void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const {
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assert(getType()->isVectorTy() && "Not a vector constant!");
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if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
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for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
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Elts.push_back(CV->getOperand(i));
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return;
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}
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VectorType *VT = cast<VectorType>(getType());
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if (isa<ConstantAggregateZero>(this)) {
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Elts.assign(VT->getNumElements(),
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Constant::getNullValue(VT->getElementType()));
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return;
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}
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if (isa<UndefValue>(this)) {
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Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
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return;
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}
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// Unknown type, must be constant expr etc.
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}
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/// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
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/// it. This involves recursively eliminating any dead users of the
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/// constantexpr.
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static bool removeDeadUsersOfConstant(const Constant *C) {
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if (isa<GlobalValue>(C)) return false; // Cannot remove this
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while (!C->use_empty()) {
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const Constant *User = dyn_cast<Constant>(C->use_back());
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if (!User) return false; // Non-constant usage;
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if (!removeDeadUsersOfConstant(User))
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return false; // Constant wasn't dead
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}
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const_cast<Constant*>(C)->destroyConstant();
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return true;
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}
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/// removeDeadConstantUsers - If there are any dead constant users dangling
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/// off of this constant, remove them. This method is useful for clients
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/// that want to check to see if a global is unused, but don't want to deal
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/// with potentially dead constants hanging off of the globals.
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void Constant::removeDeadConstantUsers() const {
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Value::const_use_iterator I = use_begin(), E = use_end();
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Value::const_use_iterator LastNonDeadUser = E;
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while (I != E) {
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const Constant *User = dyn_cast<Constant>(*I);
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if (User == 0) {
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LastNonDeadUser = I;
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++I;
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continue;
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}
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if (!removeDeadUsersOfConstant(User)) {
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// If the constant wasn't dead, remember that this was the last live use
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// and move on to the next constant.
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LastNonDeadUser = I;
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++I;
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continue;
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}
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// If the constant was dead, then the iterator is invalidated.
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if (LastNonDeadUser == E) {
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I = use_begin();
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if (I == E) break;
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} else {
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I = LastNonDeadUser;
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++I;
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}
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}
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}
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//===----------------------------------------------------------------------===//
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// ConstantInt
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//===----------------------------------------------------------------------===//
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ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
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: Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
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assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
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}
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ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
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LLVMContextImpl *pImpl = Context.pImpl;
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if (!pImpl->TheTrueVal)
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pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
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return pImpl->TheTrueVal;
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}
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ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
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LLVMContextImpl *pImpl = Context.pImpl;
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if (!pImpl->TheFalseVal)
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pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
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return pImpl->TheFalseVal;
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}
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Constant *ConstantInt::getTrue(Type *Ty) {
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VectorType *VTy = dyn_cast<VectorType>(Ty);
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if (!VTy) {
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assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
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return ConstantInt::getTrue(Ty->getContext());
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}
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assert(VTy->getElementType()->isIntegerTy(1) &&
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"True must be vector of i1 or i1.");
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SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
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ConstantInt::getTrue(Ty->getContext()));
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return ConstantVector::get(Splat);
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}
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Constant *ConstantInt::getFalse(Type *Ty) {
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VectorType *VTy = dyn_cast<VectorType>(Ty);
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if (!VTy) {
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assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
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return ConstantInt::getFalse(Ty->getContext());
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}
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assert(VTy->getElementType()->isIntegerTy(1) &&
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"False must be vector of i1 or i1.");
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SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
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ConstantInt::getFalse(Ty->getContext()));
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return ConstantVector::get(Splat);
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}
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// Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
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// as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
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// operator== and operator!= to ensure that the DenseMap doesn't attempt to
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// compare APInt's of different widths, which would violate an APInt class
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// invariant which generates an assertion.
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ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
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// Get the corresponding integer type for the bit width of the value.
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IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
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// get an existing value or the insertion position
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DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
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ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
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if (!Slot) Slot = new ConstantInt(ITy, V);
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return Slot;
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}
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Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
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Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
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// For vectors, broadcast the value.
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if (VectorType *VTy = dyn_cast<VectorType>(Ty))
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return ConstantVector::get(SmallVector<Constant*,
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16>(VTy->getNumElements(), C));
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return C;
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}
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ConstantInt* ConstantInt::get(IntegerType* Ty, uint64_t V,
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bool isSigned) {
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return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
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}
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ConstantInt* ConstantInt::getSigned(IntegerType* Ty, int64_t V) {
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return get(Ty, V, true);
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}
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Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
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return get(Ty, V, true);
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}
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Constant *ConstantInt::get(Type* Ty, const APInt& V) {
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ConstantInt *C = get(Ty->getContext(), V);
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assert(C->getType() == Ty->getScalarType() &&
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"ConstantInt type doesn't match the type implied by its value!");
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// For vectors, broadcast the value.
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if (VectorType *VTy = dyn_cast<VectorType>(Ty))
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return ConstantVector::get(
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SmallVector<Constant *, 16>(VTy->getNumElements(), C));
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return C;
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}
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ConstantInt* ConstantInt::get(IntegerType* Ty, StringRef Str,
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uint8_t radix) {
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return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
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}
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//===----------------------------------------------------------------------===//
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// ConstantFP
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//===----------------------------------------------------------------------===//
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static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
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if (Ty->isFloatTy())
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return &APFloat::IEEEsingle;
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if (Ty->isDoubleTy())
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return &APFloat::IEEEdouble;
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if (Ty->isX86_FP80Ty())
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return &APFloat::x87DoubleExtended;
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else if (Ty->isFP128Ty())
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return &APFloat::IEEEquad;
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assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
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return &APFloat::PPCDoubleDouble;
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}
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/// get() - This returns a constant fp for the specified value in the
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/// specified type. This should only be used for simple constant values like
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/// 2.0/1.0 etc, that are known-valid both as double and as the target format.
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Constant *ConstantFP::get(Type* Ty, double V) {
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LLVMContext &Context = Ty->getContext();
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APFloat FV(V);
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bool ignored;
|
|
FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
|
|
APFloat::rmNearestTiesToEven, &ignored);
|
|
Constant *C = get(Context, FV);
|
|
|
|
// For vectors, broadcast the value.
|
|
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
|
|
return ConstantVector::get(
|
|
SmallVector<Constant *, 16>(VTy->getNumElements(), C));
|
|
|
|
return C;
|
|
}
|
|
|
|
|
|
Constant *ConstantFP::get(Type* Ty, StringRef Str) {
|
|
LLVMContext &Context = Ty->getContext();
|
|
|
|
APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
|
|
Constant *C = get(Context, FV);
|
|
|
|
// For vectors, broadcast the value.
|
|
if (VectorType *VTy = dyn_cast<VectorType>(Ty))
|
|
return ConstantVector::get(
|
|
SmallVector<Constant *, 16>(VTy->getNumElements(), C));
|
|
|
|
return C;
|
|
}
|
|
|
|
|
|
ConstantFP* ConstantFP::getNegativeZero(Type* Ty) {
|
|
LLVMContext &Context = Ty->getContext();
|
|
APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
|
|
apf.changeSign();
|
|
return get(Context, apf);
|
|
}
|
|
|
|
|
|
Constant *ConstantFP::getZeroValueForNegation(Type* Ty) {
|
|
if (VectorType *PTy = dyn_cast<VectorType>(Ty))
|
|
if (PTy->getElementType()->isFloatingPointTy()) {
|
|
SmallVector<Constant*, 16> zeros(PTy->getNumElements(),
|
|
getNegativeZero(PTy->getElementType()));
|
|
return ConstantVector::get(zeros);
|
|
}
|
|
|
|
if (Ty->isFloatingPointTy())
|
|
return getNegativeZero(Ty);
|
|
|
|
return Constant::getNullValue(Ty);
|
|
}
|
|
|
|
|
|
// ConstantFP accessors.
|
|
ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
|
|
DenseMapAPFloatKeyInfo::KeyTy Key(V);
|
|
|
|
LLVMContextImpl* pImpl = Context.pImpl;
|
|
|
|
ConstantFP *&Slot = pImpl->FPConstants[Key];
|
|
|
|
if (!Slot) {
|
|
Type *Ty;
|
|
if (&V.getSemantics() == &APFloat::IEEEsingle)
|
|
Ty = Type::getFloatTy(Context);
|
|
else if (&V.getSemantics() == &APFloat::IEEEdouble)
|
|
Ty = Type::getDoubleTy(Context);
|
|
else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
|
|
Ty = Type::getX86_FP80Ty(Context);
|
|
else if (&V.getSemantics() == &APFloat::IEEEquad)
|
|
Ty = Type::getFP128Ty(Context);
|
|
else {
|
|
assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
|
|
"Unknown FP format");
|
|
Ty = Type::getPPC_FP128Ty(Context);
|
|
}
|
|
Slot = new ConstantFP(Ty, V);
|
|
}
|
|
|
|
return Slot;
|
|
}
|
|
|
|
ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
|
|
const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
|
|
return ConstantFP::get(Ty->getContext(),
|
|
APFloat::getInf(Semantics, Negative));
|
|
}
|
|
|
|
ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
|
|
: Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
|
|
assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
|
|
"FP type Mismatch");
|
|
}
|
|
|
|
bool ConstantFP::isExactlyValue(const APFloat &V) const {
|
|
return Val.bitwiseIsEqual(V);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ConstantXXX Classes
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
|
|
: Constant(T, ConstantArrayVal,
|
|
OperandTraits<ConstantArray>::op_end(this) - V.size(),
|
|
V.size()) {
|
|
assert(V.size() == T->getNumElements() &&
|
|
"Invalid initializer vector for constant array");
|
|
for (unsigned i = 0, e = V.size(); i != e; ++i)
|
|
assert(V[i]->getType() == T->getElementType() &&
|
|
"Initializer for array element doesn't match array element type!");
|
|
std::copy(V.begin(), V.end(), op_begin());
|
|
}
|
|
|
|
Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
|
|
for (unsigned i = 0, e = V.size(); i != e; ++i) {
|
|
assert(V[i]->getType() == Ty->getElementType() &&
|
|
"Wrong type in array element initializer");
|
|
}
|
|
LLVMContextImpl *pImpl = Ty->getContext().pImpl;
|
|
// If this is an all-zero array, return a ConstantAggregateZero object
|
|
if (!V.empty()) {
|
|
Constant *C = V[0];
|
|
if (!C->isNullValue())
|
|
return pImpl->ArrayConstants.getOrCreate(Ty, V);
|
|
|
|
for (unsigned i = 1, e = V.size(); i != e; ++i)
|
|
if (V[i] != C)
|
|
return pImpl->ArrayConstants.getOrCreate(Ty, V);
|
|
}
|
|
|
|
return ConstantAggregateZero::get(Ty);
|
|
}
|
|
|
|
/// ConstantArray::get(const string&) - Return an array that is initialized to
|
|
/// contain the specified string. If length is zero then a null terminator is
|
|
/// added to the specified string so that it may be used in a natural way.
|
|
/// Otherwise, the length parameter specifies how much of the string to use
|
|
/// and it won't be null terminated.
|
|
///
|
|
Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
|
|
bool AddNull) {
|
|
std::vector<Constant*> ElementVals;
|
|
ElementVals.reserve(Str.size() + size_t(AddNull));
|
|
for (unsigned i = 0; i < Str.size(); ++i)
|
|
ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
|
|
|
|
// Add a null terminator to the string...
|
|
if (AddNull) {
|
|
ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
|
|
}
|
|
|
|
ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
|
|
return get(ATy, ElementVals);
|
|
}
|
|
|
|
/// getTypeForElements - Return an anonymous struct type to use for a constant
|
|
/// with the specified set of elements. The list must not be empty.
|
|
StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
|
|
ArrayRef<Constant*> V,
|
|
bool Packed) {
|
|
SmallVector<Type*, 16> EltTypes;
|
|
for (unsigned i = 0, e = V.size(); i != e; ++i)
|
|
EltTypes.push_back(V[i]->getType());
|
|
|
|
return StructType::get(Context, EltTypes, Packed);
|
|
}
|
|
|
|
|
|
StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
|
|
bool Packed) {
|
|
assert(!V.empty() &&
|
|
"ConstantStruct::getTypeForElements cannot be called on empty list");
|
|
return getTypeForElements(V[0]->getContext(), V, Packed);
|
|
}
|
|
|
|
|
|
ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
|
|
: Constant(T, ConstantStructVal,
|
|
OperandTraits<ConstantStruct>::op_end(this) - V.size(),
|
|
V.size()) {
|
|
assert(V.size() == T->getNumElements() &&
|
|
"Invalid initializer vector for constant structure");
|
|
for (unsigned i = 0, e = V.size(); i != e; ++i)
|
|
assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
|
|
"Initializer for struct element doesn't match struct element type!");
|
|
std::copy(V.begin(), V.end(), op_begin());
|
|
}
|
|
|
|
// ConstantStruct accessors.
|
|
Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
|
|
// Create a ConstantAggregateZero value if all elements are zeros.
|
|
for (unsigned i = 0, e = V.size(); i != e; ++i)
|
|
if (!V[i]->isNullValue())
|
|
return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
|
|
|
|
assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
|
|
"Incorrect # elements specified to ConstantStruct::get");
|
|
return ConstantAggregateZero::get(ST);
|
|
}
|
|
|
|
Constant *ConstantStruct::get(StructType *T, ...) {
|
|
va_list ap;
|
|
SmallVector<Constant*, 8> Values;
|
|
va_start(ap, T);
|
|
while (Constant *Val = va_arg(ap, llvm::Constant*))
|
|
Values.push_back(Val);
|
|
va_end(ap);
|
|
return get(T, Values);
|
|
}
|
|
|
|
ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
|
|
: Constant(T, ConstantVectorVal,
|
|
OperandTraits<ConstantVector>::op_end(this) - V.size(),
|
|
V.size()) {
|
|
for (size_t i = 0, e = V.size(); i != e; i++)
|
|
assert(V[i]->getType() == T->getElementType() &&
|
|
"Initializer for vector element doesn't match vector element type!");
|
|
std::copy(V.begin(), V.end(), op_begin());
|
|
}
|
|
|
|
// ConstantVector accessors.
|
|
Constant *ConstantVector::get(ArrayRef<Constant*> V) {
|
|
assert(!V.empty() && "Vectors can't be empty");
|
|
VectorType *T = VectorType::get(V.front()->getType(), V.size());
|
|
LLVMContextImpl *pImpl = T->getContext().pImpl;
|
|
|
|
// If this is an all-undef or all-zero vector, return a
|
|
// ConstantAggregateZero or UndefValue.
|
|
Constant *C = V[0];
|
|
bool isZero = C->isNullValue();
|
|
bool isUndef = isa<UndefValue>(C);
|
|
|
|
if (isZero || isUndef) {
|
|
for (unsigned i = 1, e = V.size(); i != e; ++i)
|
|
if (V[i] != C) {
|
|
isZero = isUndef = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (isZero)
|
|
return ConstantAggregateZero::get(T);
|
|
if (isUndef)
|
|
return UndefValue::get(T);
|
|
|
|
return pImpl->VectorConstants.getOrCreate(T, V);
|
|
}
|
|
|
|
// Utility function for determining if a ConstantExpr is a CastOp or not. This
|
|
// can't be inline because we don't want to #include Instruction.h into
|
|
// Constant.h
|
|
bool ConstantExpr::isCast() const {
|
|
return Instruction::isCast(getOpcode());
|
|
}
|
|
|
|
bool ConstantExpr::isCompare() const {
|
|
return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
|
|
}
|
|
|
|
bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
|
|
if (getOpcode() != Instruction::GetElementPtr) return false;
|
|
|
|
gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
|
|
User::const_op_iterator OI = llvm::next(this->op_begin());
|
|
|
|
// Skip the first index, as it has no static limit.
|
|
++GEPI;
|
|
++OI;
|
|
|
|
// The remaining indices must be compile-time known integers within the
|
|
// bounds of the corresponding notional static array types.
|
|
for (; GEPI != E; ++GEPI, ++OI) {
|
|
ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
|
|
if (!CI) return false;
|
|
if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
|
|
if (CI->getValue().getActiveBits() > 64 ||
|
|
CI->getZExtValue() >= ATy->getNumElements())
|
|
return false;
|
|
}
|
|
|
|
// All the indices checked out.
|
|
return true;
|
|
}
|
|
|
|
bool ConstantExpr::hasIndices() const {
|
|
return getOpcode() == Instruction::ExtractValue ||
|
|
getOpcode() == Instruction::InsertValue;
|
|
}
|
|
|
|
ArrayRef<unsigned> ConstantExpr::getIndices() const {
|
|
if (const ExtractValueConstantExpr *EVCE =
|
|
dyn_cast<ExtractValueConstantExpr>(this))
|
|
return EVCE->Indices;
|
|
|
|
return cast<InsertValueConstantExpr>(this)->Indices;
|
|
}
|
|
|
|
unsigned ConstantExpr::getPredicate() const {
|
|
assert(isCompare());
|
|
return ((const CompareConstantExpr*)this)->predicate;
|
|
}
|
|
|
|
/// getWithOperandReplaced - Return a constant expression identical to this
|
|
/// one, but with the specified operand set to the specified value.
|
|
Constant *
|
|
ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
|
|
assert(OpNo < getNumOperands() && "Operand num is out of range!");
|
|
assert(Op->getType() == getOperand(OpNo)->getType() &&
|
|
"Replacing operand with value of different type!");
|
|
if (getOperand(OpNo) == Op)
|
|
return const_cast<ConstantExpr*>(this);
|
|
|
|
Constant *Op0, *Op1, *Op2;
|
|
switch (getOpcode()) {
|
|
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::PtrToInt:
|
|
case Instruction::IntToPtr:
|
|
case Instruction::BitCast:
|
|
return ConstantExpr::getCast(getOpcode(), Op, getType());
|
|
case Instruction::Select:
|
|
Op0 = (OpNo == 0) ? Op : getOperand(0);
|
|
Op1 = (OpNo == 1) ? Op : getOperand(1);
|
|
Op2 = (OpNo == 2) ? Op : getOperand(2);
|
|
return ConstantExpr::getSelect(Op0, Op1, Op2);
|
|
case Instruction::InsertElement:
|
|
Op0 = (OpNo == 0) ? Op : getOperand(0);
|
|
Op1 = (OpNo == 1) ? Op : getOperand(1);
|
|
Op2 = (OpNo == 2) ? Op : getOperand(2);
|
|
return ConstantExpr::getInsertElement(Op0, Op1, Op2);
|
|
case Instruction::ExtractElement:
|
|
Op0 = (OpNo == 0) ? Op : getOperand(0);
|
|
Op1 = (OpNo == 1) ? Op : getOperand(1);
|
|
return ConstantExpr::getExtractElement(Op0, Op1);
|
|
case Instruction::ShuffleVector:
|
|
Op0 = (OpNo == 0) ? Op : getOperand(0);
|
|
Op1 = (OpNo == 1) ? Op : getOperand(1);
|
|
Op2 = (OpNo == 2) ? Op : getOperand(2);
|
|
return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
|
|
case Instruction::GetElementPtr: {
|
|
SmallVector<Constant*, 8> Ops;
|
|
Ops.resize(getNumOperands()-1);
|
|
for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
|
|
Ops[i-1] = getOperand(i);
|
|
if (OpNo == 0)
|
|
return
|
|
ConstantExpr::getGetElementPtr(Op, Ops,
|
|
cast<GEPOperator>(this)->isInBounds());
|
|
Ops[OpNo-1] = Op;
|
|
return
|
|
ConstantExpr::getGetElementPtr(getOperand(0), Ops,
|
|
cast<GEPOperator>(this)->isInBounds());
|
|
}
|
|
default:
|
|
assert(getNumOperands() == 2 && "Must be binary operator?");
|
|
Op0 = (OpNo == 0) ? Op : getOperand(0);
|
|
Op1 = (OpNo == 1) ? Op : getOperand(1);
|
|
return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
|
|
}
|
|
}
|
|
|
|
/// getWithOperands - This returns the current constant expression with the
|
|
/// operands replaced with the specified values. The specified array must
|
|
/// have the same number of operands as our current one.
|
|
Constant *ConstantExpr::
|
|
getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
|
|
assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
|
|
bool AnyChange = Ty != getType();
|
|
for (unsigned i = 0; i != Ops.size(); ++i)
|
|
AnyChange |= Ops[i] != getOperand(i);
|
|
|
|
if (!AnyChange) // No operands changed, return self.
|
|
return const_cast<ConstantExpr*>(this);
|
|
|
|
switch (getOpcode()) {
|
|
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::PtrToInt:
|
|
case Instruction::IntToPtr:
|
|
case Instruction::BitCast:
|
|
return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
|
|
case Instruction::Select:
|
|
return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
|
|
case Instruction::InsertElement:
|
|
return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
|
|
case Instruction::ExtractElement:
|
|
return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
|
|
case Instruction::ShuffleVector:
|
|
return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
|
|
case Instruction::GetElementPtr:
|
|
return
|
|
ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
|
|
cast<GEPOperator>(this)->isInBounds());
|
|
case Instruction::ICmp:
|
|
case Instruction::FCmp:
|
|
return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
|
|
default:
|
|
assert(getNumOperands() == 2 && "Must be binary operator?");
|
|
return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
|
|
}
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// isValueValidForType implementations
|
|
|
|
bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
|
|
unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
|
|
if (Ty == Type::getInt1Ty(Ty->getContext()))
|
|
return Val == 0 || Val == 1;
|
|
if (NumBits >= 64)
|
|
return true; // always true, has to fit in largest type
|
|
uint64_t Max = (1ll << NumBits) - 1;
|
|
return Val <= Max;
|
|
}
|
|
|
|
bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
|
|
unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
|
|
if (Ty == Type::getInt1Ty(Ty->getContext()))
|
|
return Val == 0 || Val == 1 || Val == -1;
|
|
if (NumBits >= 64)
|
|
return true; // always true, has to fit in largest type
|
|
int64_t Min = -(1ll << (NumBits-1));
|
|
int64_t Max = (1ll << (NumBits-1)) - 1;
|
|
return (Val >= Min && Val <= Max);
|
|
}
|
|
|
|
bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
|
|
// convert modifies in place, so make a copy.
|
|
APFloat Val2 = APFloat(Val);
|
|
bool losesInfo;
|
|
switch (Ty->getTypeID()) {
|
|
default:
|
|
return false; // These can't be represented as floating point!
|
|
|
|
// FIXME rounding mode needs to be more flexible
|
|
case Type::FloatTyID: {
|
|
if (&Val2.getSemantics() == &APFloat::IEEEsingle)
|
|
return true;
|
|
Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
|
|
return !losesInfo;
|
|
}
|
|
case Type::DoubleTyID: {
|
|
if (&Val2.getSemantics() == &APFloat::IEEEsingle ||
|
|
&Val2.getSemantics() == &APFloat::IEEEdouble)
|
|
return true;
|
|
Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
|
|
return !losesInfo;
|
|
}
|
|
case Type::X86_FP80TyID:
|
|
return &Val2.getSemantics() == &APFloat::IEEEsingle ||
|
|
&Val2.getSemantics() == &APFloat::IEEEdouble ||
|
|
&Val2.getSemantics() == &APFloat::x87DoubleExtended;
|
|
case Type::FP128TyID:
|
|
return &Val2.getSemantics() == &APFloat::IEEEsingle ||
|
|
&Val2.getSemantics() == &APFloat::IEEEdouble ||
|
|
&Val2.getSemantics() == &APFloat::IEEEquad;
|
|
case Type::PPC_FP128TyID:
|
|
return &Val2.getSemantics() == &APFloat::IEEEsingle ||
|
|
&Val2.getSemantics() == &APFloat::IEEEdouble ||
|
|
&Val2.getSemantics() == &APFloat::PPCDoubleDouble;
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Factory Function Implementation
|
|
|
|
ConstantAggregateZero* ConstantAggregateZero::get(Type* Ty) {
|
|
assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
|
|
"Cannot create an aggregate zero of non-aggregate type!");
|
|
|
|
LLVMContextImpl *pImpl = Ty->getContext().pImpl;
|
|
return pImpl->AggZeroConstants.getOrCreate(Ty, 0);
|
|
}
|
|
|
|
/// destroyConstant - Remove the constant from the constant table...
|
|
///
|
|
void ConstantAggregateZero::destroyConstant() {
|
|
getType()->getContext().pImpl->AggZeroConstants.remove(this);
|
|
destroyConstantImpl();
|
|
}
|
|
|
|
/// destroyConstant - Remove the constant from the constant table...
|
|
///
|
|
void ConstantArray::destroyConstant() {
|
|
getType()->getContext().pImpl->ArrayConstants.remove(this);
|
|
destroyConstantImpl();
|
|
}
|
|
|
|
/// isString - This method returns true if the array is an array of i8, and
|
|
/// if the elements of the array are all ConstantInt's.
|
|
bool ConstantArray::isString() const {
|
|
// Check the element type for i8...
|
|
if (!getType()->getElementType()->isIntegerTy(8))
|
|
return false;
|
|
// Check the elements to make sure they are all integers, not constant
|
|
// expressions.
|
|
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
|
|
if (!isa<ConstantInt>(getOperand(i)))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/// isCString - This method returns true if the array is a string (see
|
|
/// isString) and it ends in a null byte \\0 and does not contains any other
|
|
/// null bytes except its terminator.
|
|
bool ConstantArray::isCString() const {
|
|
// Check the element type for i8...
|
|
if (!getType()->getElementType()->isIntegerTy(8))
|
|
return false;
|
|
|
|
// Last element must be a null.
|
|
if (!getOperand(getNumOperands()-1)->isNullValue())
|
|
return false;
|
|
// Other elements must be non-null integers.
|
|
for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
|
|
if (!isa<ConstantInt>(getOperand(i)))
|
|
return false;
|
|
if (getOperand(i)->isNullValue())
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
/// convertToString - Helper function for getAsString() and getAsCString().
|
|
static std::string convertToString(const User *U, unsigned len) {
|
|
std::string Result;
|
|
Result.reserve(len);
|
|
for (unsigned i = 0; i != len; ++i)
|
|
Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
|
|
return Result;
|
|
}
|
|
|
|
/// getAsString - If this array is isString(), then this method converts the
|
|
/// array to an std::string and returns it. Otherwise, it asserts out.
|
|
///
|
|
std::string ConstantArray::getAsString() const {
|
|
assert(isString() && "Not a string!");
|
|
return convertToString(this, getNumOperands());
|
|
}
|
|
|
|
|
|
/// getAsCString - If this array is isCString(), then this method converts the
|
|
/// array (without the trailing null byte) to an std::string and returns it.
|
|
/// Otherwise, it asserts out.
|
|
///
|
|
std::string ConstantArray::getAsCString() const {
|
|
assert(isCString() && "Not a string!");
|
|
return convertToString(this, getNumOperands() - 1);
|
|
}
|
|
|
|
|
|
//---- ConstantStruct::get() implementation...
|
|
//
|
|
|
|
// destroyConstant - Remove the constant from the constant table...
|
|
//
|
|
void ConstantStruct::destroyConstant() {
|
|
getType()->getContext().pImpl->StructConstants.remove(this);
|
|
destroyConstantImpl();
|
|
}
|
|
|
|
// destroyConstant - Remove the constant from the constant table...
|
|
//
|
|
void ConstantVector::destroyConstant() {
|
|
getType()->getContext().pImpl->VectorConstants.remove(this);
|
|
destroyConstantImpl();
|
|
}
|
|
|
|
/// This function will return true iff every element in this vector constant
|
|
/// is set to all ones.
|
|
/// @returns true iff this constant's elements are all set to all ones.
|
|
/// @brief Determine if the value is all ones.
|
|
bool ConstantVector::isAllOnesValue() const {
|
|
// Check out first element.
|
|
const Constant *Elt = getOperand(0);
|
|
const ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
|
|
const ConstantFP *CF = dyn_cast<ConstantFP>(Elt);
|
|
|
|
// Then make sure all remaining elements point to the same value.
|
|
for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
|
|
if (getOperand(I) != Elt)
|
|
return false;
|
|
|
|
// First value is all-ones.
|
|
return (CI && CI->isAllOnesValue()) ||
|
|
(CF && CF->isAllOnesValue());
|
|
}
|
|
|
|
/// getSplatValue - If this is a splat constant, where all of the
|
|
/// elements have the same value, return that value. Otherwise return null.
|
|
Constant *ConstantVector::getSplatValue() const {
|
|
// Check out first element.
|
|
Constant *Elt = getOperand(0);
|
|
// Then make sure all remaining elements point to the same value.
|
|
for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
|
|
if (getOperand(I) != Elt)
|
|
return 0;
|
|
return Elt;
|
|
}
|
|
|
|
//---- ConstantPointerNull::get() implementation.
|
|
//
|
|
|
|
ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
|
|
return Ty->getContext().pImpl->NullPtrConstants.getOrCreate(Ty, 0);
|
|
}
|
|
|
|
// destroyConstant - Remove the constant from the constant table...
|
|
//
|
|
void ConstantPointerNull::destroyConstant() {
|
|
getType()->getContext().pImpl->NullPtrConstants.remove(this);
|
|
destroyConstantImpl();
|
|
}
|
|
|
|
|
|
//---- UndefValue::get() implementation.
|
|
//
|
|
|
|
UndefValue *UndefValue::get(Type *Ty) {
|
|
return Ty->getContext().pImpl->UndefValueConstants.getOrCreate(Ty, 0);
|
|
}
|
|
|
|
// destroyConstant - Remove the constant from the constant table.
|
|
//
|
|
void UndefValue::destroyConstant() {
|
|
getType()->getContext().pImpl->UndefValueConstants.remove(this);
|
|
destroyConstantImpl();
|
|
}
|
|
|
|
//---- BlockAddress::get() implementation.
|
|
//
|
|
|
|
BlockAddress *BlockAddress::get(BasicBlock *BB) {
|
|
assert(BB->getParent() != 0 && "Block must have a parent");
|
|
return get(BB->getParent(), BB);
|
|
}
|
|
|
|
BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
|
|
BlockAddress *&BA =
|
|
F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
|
|
if (BA == 0)
|
|
BA = new BlockAddress(F, BB);
|
|
|
|
assert(BA->getFunction() == F && "Basic block moved between functions");
|
|
return BA;
|
|
}
|
|
|
|
BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
|
|
: Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
|
|
&Op<0>(), 2) {
|
|
setOperand(0, F);
|
|
setOperand(1, BB);
|
|
BB->AdjustBlockAddressRefCount(1);
|
|
}
|
|
|
|
|
|
// destroyConstant - Remove the constant from the constant table.
|
|
//
|
|
void BlockAddress::destroyConstant() {
|
|
getFunction()->getType()->getContext().pImpl
|
|
->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
|
|
getBasicBlock()->AdjustBlockAddressRefCount(-1);
|
|
destroyConstantImpl();
|
|
}
|
|
|
|
void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
|
|
// This could be replacing either the Basic Block or the Function. In either
|
|
// case, we have to remove the map entry.
|
|
Function *NewF = getFunction();
|
|
BasicBlock *NewBB = getBasicBlock();
|
|
|
|
if (U == &Op<0>())
|
|
NewF = cast<Function>(To);
|
|
else
|
|
NewBB = cast<BasicBlock>(To);
|
|
|
|
// See if the 'new' entry already exists, if not, just update this in place
|
|
// and return early.
|
|
BlockAddress *&NewBA =
|
|
getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
|
|
if (NewBA == 0) {
|
|
getBasicBlock()->AdjustBlockAddressRefCount(-1);
|
|
|
|
// Remove the old entry, this can't cause the map to rehash (just a
|
|
// tombstone will get added).
|
|
getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
|
|
getBasicBlock()));
|
|
NewBA = this;
|
|
setOperand(0, NewF);
|
|
setOperand(1, NewBB);
|
|
getBasicBlock()->AdjustBlockAddressRefCount(1);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, I do need to replace this with an existing value.
|
|
assert(NewBA != this && "I didn't contain From!");
|
|
|
|
// Everyone using this now uses the replacement.
|
|
replaceAllUsesWith(NewBA);
|
|
|
|
destroyConstant();
|
|
}
|
|
|
|
//---- ConstantExpr::get() implementations.
|
|
//
|
|
|
|
/// This is a utility function to handle folding of casts and lookup of the
|
|
/// cast in the ExprConstants map. It is used by the various get* methods below.
|
|
static inline Constant *getFoldedCast(
|
|
Instruction::CastOps opc, Constant *C, Type *Ty) {
|
|
assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
|
|
// Fold a few common cases
|
|
if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
|
|
return FC;
|
|
|
|
LLVMContextImpl *pImpl = Ty->getContext().pImpl;
|
|
|
|
// Look up the constant in the table first to ensure uniqueness
|
|
std::vector<Constant*> argVec(1, C);
|
|
ExprMapKeyType Key(opc, argVec);
|
|
|
|
return pImpl->ExprConstants.getOrCreate(Ty, Key);
|
|
}
|
|
|
|
Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
|
|
Instruction::CastOps opc = Instruction::CastOps(oc);
|
|
assert(Instruction::isCast(opc) && "opcode out of range");
|
|
assert(C && Ty && "Null arguments to getCast");
|
|
assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
|
|
|
|
switch (opc) {
|
|
default:
|
|
llvm_unreachable("Invalid cast opcode");
|
|
break;
|
|
case Instruction::Trunc: return getTrunc(C, Ty);
|
|
case Instruction::ZExt: return getZExt(C, Ty);
|
|
case Instruction::SExt: return getSExt(C, Ty);
|
|
case Instruction::FPTrunc: return getFPTrunc(C, Ty);
|
|
case Instruction::FPExt: return getFPExtend(C, Ty);
|
|
case Instruction::UIToFP: return getUIToFP(C, Ty);
|
|
case Instruction::SIToFP: return getSIToFP(C, Ty);
|
|
case Instruction::FPToUI: return getFPToUI(C, Ty);
|
|
case Instruction::FPToSI: return getFPToSI(C, Ty);
|
|
case Instruction::PtrToInt: return getPtrToInt(C, Ty);
|
|
case Instruction::IntToPtr: return getIntToPtr(C, Ty);
|
|
case Instruction::BitCast: return getBitCast(C, Ty);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
|
|
if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
|
|
return getBitCast(C, Ty);
|
|
return getZExt(C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
|
|
if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
|
|
return getBitCast(C, Ty);
|
|
return getSExt(C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
|
|
if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
|
|
return getBitCast(C, Ty);
|
|
return getTrunc(C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
|
|
assert(S->getType()->isPointerTy() && "Invalid cast");
|
|
assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
|
|
|
|
if (Ty->isIntegerTy())
|
|
return getPtrToInt(S, Ty);
|
|
return getBitCast(S, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
|
|
bool isSigned) {
|
|
assert(C->getType()->isIntOrIntVectorTy() &&
|
|
Ty->isIntOrIntVectorTy() && "Invalid cast");
|
|
unsigned SrcBits = C->getType()->getScalarSizeInBits();
|
|
unsigned DstBits = Ty->getScalarSizeInBits();
|
|
Instruction::CastOps opcode =
|
|
(SrcBits == DstBits ? Instruction::BitCast :
|
|
(SrcBits > DstBits ? Instruction::Trunc :
|
|
(isSigned ? Instruction::SExt : Instruction::ZExt)));
|
|
return getCast(opcode, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
|
|
assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
|
|
"Invalid cast");
|
|
unsigned SrcBits = C->getType()->getScalarSizeInBits();
|
|
unsigned DstBits = Ty->getScalarSizeInBits();
|
|
if (SrcBits == DstBits)
|
|
return C; // Avoid a useless cast
|
|
Instruction::CastOps opcode =
|
|
(SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
|
|
return getCast(opcode, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
|
|
assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
|
|
assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
|
|
"SrcTy must be larger than DestTy for Trunc!");
|
|
|
|
return getFoldedCast(Instruction::Trunc, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
|
|
assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
|
|
assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
|
|
"SrcTy must be smaller than DestTy for SExt!");
|
|
|
|
return getFoldedCast(Instruction::SExt, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
|
|
assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
|
|
assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
|
|
"SrcTy must be smaller than DestTy for ZExt!");
|
|
|
|
return getFoldedCast(Instruction::ZExt, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
|
|
C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
|
|
"This is an illegal floating point truncation!");
|
|
return getFoldedCast(Instruction::FPTrunc, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
|
|
C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
|
|
"This is an illegal floating point extension!");
|
|
return getFoldedCast(Instruction::FPExt, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
|
|
"This is an illegal uint to floating point cast!");
|
|
return getFoldedCast(Instruction::UIToFP, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
|
|
"This is an illegal sint to floating point cast!");
|
|
return getFoldedCast(Instruction::SIToFP, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
|
|
"This is an illegal floating point to uint cast!");
|
|
return getFoldedCast(Instruction::FPToUI, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
|
|
#ifndef NDEBUG
|
|
bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
|
|
bool toVec = Ty->getTypeID() == Type::VectorTyID;
|
|
#endif
|
|
assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
|
|
assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
|
|
"This is an illegal floating point to sint cast!");
|
|
return getFoldedCast(Instruction::FPToSI, C, Ty);
|
|
}
|
|
|
|
Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
|
|
assert(C->getType()->isPointerTy() && "PtrToInt source must be pointer");
|
|
assert(DstTy->isIntegerTy() && "PtrToInt destination must be integral");
|
|
return getFoldedCast(Instruction::PtrToInt, C, DstTy);
|
|
}
|
|
|
|
Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
|
|
assert(C->getType()->isIntegerTy() && "IntToPtr source must be integral");
|
|
assert(DstTy->isPointerTy() && "IntToPtr destination must be a pointer");
|
|
return getFoldedCast(Instruction::IntToPtr, C, DstTy);
|
|
}
|
|
|
|
Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
|
|
assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
|
|
"Invalid constantexpr bitcast!");
|
|
|
|
// It is common to ask for a bitcast of a value to its own type, handle this
|
|
// speedily.
|
|
if (C->getType() == DstTy) return C;
|
|
|
|
return getFoldedCast(Instruction::BitCast, C, DstTy);
|
|
}
|
|
|
|
Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
|
|
unsigned Flags) {
|
|
// Check the operands for consistency first.
|
|
assert(Opcode >= Instruction::BinaryOpsBegin &&
|
|
Opcode < Instruction::BinaryOpsEnd &&
|
|
"Invalid opcode in binary constant expression");
|
|
assert(C1->getType() == C2->getType() &&
|
|
"Operand types in binary constant expression should match");
|
|
|
|
#ifndef NDEBUG
|
|
switch (Opcode) {
|
|
case Instruction::Add:
|
|
case Instruction::Sub:
|
|
case Instruction::Mul:
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
assert(C1->getType()->isIntOrIntVectorTy() &&
|
|
"Tried to create an integer operation on a non-integer type!");
|
|
break;
|
|
case Instruction::FAdd:
|
|
case Instruction::FSub:
|
|
case Instruction::FMul:
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
assert(C1->getType()->isFPOrFPVectorTy() &&
|
|
"Tried to create a floating-point operation on a "
|
|
"non-floating-point type!");
|
|
break;
|
|
case Instruction::UDiv:
|
|
case Instruction::SDiv:
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
assert(C1->getType()->isIntOrIntVectorTy() &&
|
|
"Tried to create an arithmetic operation on a non-arithmetic type!");
|
|
break;
|
|
case Instruction::FDiv:
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
assert(C1->getType()->isFPOrFPVectorTy() &&
|
|
"Tried to create an arithmetic operation on a non-arithmetic type!");
|
|
break;
|
|
case Instruction::URem:
|
|
case Instruction::SRem:
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
assert(C1->getType()->isIntOrIntVectorTy() &&
|
|
"Tried to create an arithmetic operation on a non-arithmetic type!");
|
|
break;
|
|
case Instruction::FRem:
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
assert(C1->getType()->isFPOrFPVectorTy() &&
|
|
"Tried to create an arithmetic operation on a non-arithmetic type!");
|
|
break;
|
|
case Instruction::And:
|
|
case Instruction::Or:
|
|
case Instruction::Xor:
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
assert(C1->getType()->isIntOrIntVectorTy() &&
|
|
"Tried to create a logical operation on a non-integral type!");
|
|
break;
|
|
case Instruction::Shl:
|
|
case Instruction::LShr:
|
|
case Instruction::AShr:
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
assert(C1->getType()->isIntOrIntVectorTy() &&
|
|
"Tried to create a shift operation on a non-integer type!");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
|
|
return FC; // Fold a few common cases.
|
|
|
|
std::vector<Constant*> argVec(1, C1);
|
|
argVec.push_back(C2);
|
|
ExprMapKeyType Key(Opcode, argVec, 0, Flags);
|
|
|
|
LLVMContextImpl *pImpl = C1->getContext().pImpl;
|
|
return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
|
|
}
|
|
|
|
Constant *ConstantExpr::getSizeOf(Type* Ty) {
|
|
// sizeof is implemented as: (i64) gep (Ty*)null, 1
|
|
// Note that a non-inbounds gep is used, as null isn't within any object.
|
|
Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
|
|
Constant *GEP = getGetElementPtr(
|
|
Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
|
|
return getPtrToInt(GEP,
|
|
Type::getInt64Ty(Ty->getContext()));
|
|
}
|
|
|
|
Constant *ConstantExpr::getAlignOf(Type* Ty) {
|
|
// alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
|
|
// Note that a non-inbounds gep is used, as null isn't within any object.
|
|
Type *AligningTy =
|
|
StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
|
|
Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
|
|
Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
|
|
Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
|
|
Constant *Indices[2] = { Zero, One };
|
|
Constant *GEP = getGetElementPtr(NullPtr, Indices);
|
|
return getPtrToInt(GEP,
|
|
Type::getInt64Ty(Ty->getContext()));
|
|
}
|
|
|
|
Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
|
|
return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
|
|
FieldNo));
|
|
}
|
|
|
|
Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
|
|
// offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
|
|
// Note that a non-inbounds gep is used, as null isn't within any object.
|
|
Constant *GEPIdx[] = {
|
|
ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
|
|
FieldNo
|
|
};
|
|
Constant *GEP = getGetElementPtr(
|
|
Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
|
|
return getPtrToInt(GEP,
|
|
Type::getInt64Ty(Ty->getContext()));
|
|
}
|
|
|
|
Constant *ConstantExpr::getCompare(unsigned short Predicate,
|
|
Constant *C1, Constant *C2) {
|
|
assert(C1->getType() == C2->getType() && "Op types should be identical!");
|
|
|
|
switch (Predicate) {
|
|
default: llvm_unreachable("Invalid CmpInst predicate");
|
|
case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
|
|
case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
|
|
case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
|
|
case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
|
|
case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
|
|
case CmpInst::FCMP_TRUE:
|
|
return getFCmp(Predicate, C1, C2);
|
|
|
|
case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
|
|
case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
|
|
case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
|
|
case CmpInst::ICMP_SLE:
|
|
return getICmp(Predicate, C1, C2);
|
|
}
|
|
}
|
|
|
|
Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
|
|
assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
|
|
|
|
if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
|
|
return SC; // Fold common cases
|
|
|
|
std::vector<Constant*> argVec(3, C);
|
|
argVec[1] = V1;
|
|
argVec[2] = V2;
|
|
ExprMapKeyType Key(Instruction::Select, argVec);
|
|
|
|
LLVMContextImpl *pImpl = C->getContext().pImpl;
|
|
return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
|
|
}
|
|
|
|
Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
|
|
bool InBounds) {
|
|
if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
|
|
return FC; // Fold a few common cases.
|
|
|
|
// Get the result type of the getelementptr!
|
|
Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
|
|
assert(Ty && "GEP indices invalid!");
|
|
unsigned AS = cast<PointerType>(C->getType())->getAddressSpace();
|
|
Type *ReqTy = Ty->getPointerTo(AS);
|
|
|
|
assert(C->getType()->isPointerTy() &&
|
|
"Non-pointer type for constant GetElementPtr expression");
|
|
// Look up the constant in the table first to ensure uniqueness
|
|
std::vector<Constant*> ArgVec;
|
|
ArgVec.reserve(1 + Idxs.size());
|
|
ArgVec.push_back(C);
|
|
for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
|
|
ArgVec.push_back(cast<Constant>(Idxs[i]));
|
|
const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
|
|
InBounds ? GEPOperator::IsInBounds : 0);
|
|
|
|
LLVMContextImpl *pImpl = C->getContext().pImpl;
|
|
return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
|
|
}
|
|
|
|
Constant *
|
|
ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
|
|
assert(LHS->getType() == RHS->getType());
|
|
assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
|
|
pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
|
|
|
|
if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
|
|
return FC; // Fold a few common cases...
|
|
|
|
// Look up the constant in the table first to ensure uniqueness
|
|
std::vector<Constant*> ArgVec;
|
|
ArgVec.push_back(LHS);
|
|
ArgVec.push_back(RHS);
|
|
// Get the key type with both the opcode and predicate
|
|
const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
|
|
|
|
Type *ResultTy = Type::getInt1Ty(LHS->getContext());
|
|
if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
|
|
ResultTy = VectorType::get(ResultTy, VT->getNumElements());
|
|
|
|
LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
|
|
return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
|
|
}
|
|
|
|
Constant *
|
|
ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
|
|
assert(LHS->getType() == RHS->getType());
|
|
assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
|
|
|
|
if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
|
|
return FC; // Fold a few common cases...
|
|
|
|
// Look up the constant in the table first to ensure uniqueness
|
|
std::vector<Constant*> ArgVec;
|
|
ArgVec.push_back(LHS);
|
|
ArgVec.push_back(RHS);
|
|
// Get the key type with both the opcode and predicate
|
|
const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
|
|
|
|
Type *ResultTy = Type::getInt1Ty(LHS->getContext());
|
|
if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
|
|
ResultTy = VectorType::get(ResultTy, VT->getNumElements());
|
|
|
|
LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
|
|
return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
|
|
}
|
|
|
|
Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
|
|
assert(Val->getType()->isVectorTy() &&
|
|
"Tried to create extractelement operation on non-vector type!");
|
|
assert(Idx->getType()->isIntegerTy(32) &&
|
|
"Extractelement index must be i32 type!");
|
|
|
|
if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
|
|
return FC; // Fold a few common cases.
|
|
|
|
// Look up the constant in the table first to ensure uniqueness
|
|
std::vector<Constant*> ArgVec(1, Val);
|
|
ArgVec.push_back(Idx);
|
|
const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
|
|
|
|
LLVMContextImpl *pImpl = Val->getContext().pImpl;
|
|
Type *ReqTy = cast<VectorType>(Val->getType())->getElementType();
|
|
return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
|
|
}
|
|
|
|
Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
|
|
Constant *Idx) {
|
|
assert(Val->getType()->isVectorTy() &&
|
|
"Tried to create insertelement operation on non-vector type!");
|
|
assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
|
|
&& "Insertelement types must match!");
|
|
assert(Idx->getType()->isIntegerTy(32) &&
|
|
"Insertelement index must be i32 type!");
|
|
|
|
if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
|
|
return FC; // Fold a few common cases.
|
|
// Look up the constant in the table first to ensure uniqueness
|
|
std::vector<Constant*> ArgVec(1, Val);
|
|
ArgVec.push_back(Elt);
|
|
ArgVec.push_back(Idx);
|
|
const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
|
|
|
|
LLVMContextImpl *pImpl = Val->getContext().pImpl;
|
|
return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
|
|
}
|
|
|
|
Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
|
|
Constant *Mask) {
|
|
assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
|
|
"Invalid shuffle vector constant expr operands!");
|
|
|
|
if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
|
|
return FC; // Fold a few common cases.
|
|
|
|
unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
|
|
Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
|
|
Type *ShufTy = VectorType::get(EltTy, NElts);
|
|
|
|
// Look up the constant in the table first to ensure uniqueness
|
|
std::vector<Constant*> ArgVec(1, V1);
|
|
ArgVec.push_back(V2);
|
|
ArgVec.push_back(Mask);
|
|
const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
|
|
|
|
LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
|
|
return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
|
|
}
|
|
|
|
Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
|
|
ArrayRef<unsigned> Idxs) {
|
|
assert(ExtractValueInst::getIndexedType(Agg->getType(),
|
|
Idxs) == Val->getType() &&
|
|
"insertvalue indices invalid!");
|
|
assert(Agg->getType()->isFirstClassType() &&
|
|
"Non-first-class type for constant insertvalue expression");
|
|
Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
|
|
assert(FC && "insertvalue constant expr couldn't be folded!");
|
|
return FC;
|
|
}
|
|
|
|
Constant *ConstantExpr::getExtractValue(Constant *Agg,
|
|
ArrayRef<unsigned> Idxs) {
|
|
assert(Agg->getType()->isFirstClassType() &&
|
|
"Tried to create extractelement operation on non-first-class type!");
|
|
|
|
Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
|
|
(void)ReqTy;
|
|
assert(ReqTy && "extractvalue indices invalid!");
|
|
|
|
assert(Agg->getType()->isFirstClassType() &&
|
|
"Non-first-class type for constant extractvalue expression");
|
|
Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
|
|
assert(FC && "ExtractValue constant expr couldn't be folded!");
|
|
return FC;
|
|
}
|
|
|
|
Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
|
|
assert(C->getType()->isIntOrIntVectorTy() &&
|
|
"Cannot NEG a nonintegral value!");
|
|
return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
|
|
C, HasNUW, HasNSW);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFNeg(Constant *C) {
|
|
assert(C->getType()->isFPOrFPVectorTy() &&
|
|
"Cannot FNEG a non-floating-point value!");
|
|
return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
|
|
}
|
|
|
|
Constant *ConstantExpr::getNot(Constant *C) {
|
|
assert(C->getType()->isIntOrIntVectorTy() &&
|
|
"Cannot NOT a nonintegral value!");
|
|
return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
|
|
}
|
|
|
|
Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
|
|
bool HasNUW, bool HasNSW) {
|
|
unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
|
|
(HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
|
|
return get(Instruction::Add, C1, C2, Flags);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
|
|
return get(Instruction::FAdd, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
|
|
bool HasNUW, bool HasNSW) {
|
|
unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
|
|
(HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
|
|
return get(Instruction::Sub, C1, C2, Flags);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
|
|
return get(Instruction::FSub, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
|
|
bool HasNUW, bool HasNSW) {
|
|
unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
|
|
(HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
|
|
return get(Instruction::Mul, C1, C2, Flags);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
|
|
return get(Instruction::FMul, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
|
|
return get(Instruction::UDiv, C1, C2,
|
|
isExact ? PossiblyExactOperator::IsExact : 0);
|
|
}
|
|
|
|
Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
|
|
return get(Instruction::SDiv, C1, C2,
|
|
isExact ? PossiblyExactOperator::IsExact : 0);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
|
|
return get(Instruction::FDiv, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
|
|
return get(Instruction::URem, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
|
|
return get(Instruction::SRem, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
|
|
return get(Instruction::FRem, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
|
|
return get(Instruction::And, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
|
|
return get(Instruction::Or, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
|
|
return get(Instruction::Xor, C1, C2);
|
|
}
|
|
|
|
Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
|
|
bool HasNUW, bool HasNSW) {
|
|
unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
|
|
(HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
|
|
return get(Instruction::Shl, C1, C2, Flags);
|
|
}
|
|
|
|
Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
|
|
return get(Instruction::LShr, C1, C2,
|
|
isExact ? PossiblyExactOperator::IsExact : 0);
|
|
}
|
|
|
|
Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
|
|
return get(Instruction::AShr, C1, C2,
|
|
isExact ? PossiblyExactOperator::IsExact : 0);
|
|
}
|
|
|
|
// destroyConstant - Remove the constant from the constant table...
|
|
//
|
|
void ConstantExpr::destroyConstant() {
|
|
getType()->getContext().pImpl->ExprConstants.remove(this);
|
|
destroyConstantImpl();
|
|
}
|
|
|
|
const char *ConstantExpr::getOpcodeName() const {
|
|
return Instruction::getOpcodeName(getOpcode());
|
|
}
|
|
|
|
|
|
|
|
GetElementPtrConstantExpr::
|
|
GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
|
|
Type *DestTy)
|
|
: ConstantExpr(DestTy, Instruction::GetElementPtr,
|
|
OperandTraits<GetElementPtrConstantExpr>::op_end(this)
|
|
- (IdxList.size()+1), IdxList.size()+1) {
|
|
OperandList[0] = C;
|
|
for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
|
|
OperandList[i+1] = IdxList[i];
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// replaceUsesOfWithOnConstant implementations
|
|
|
|
/// replaceUsesOfWithOnConstant - Update this constant array to change uses of
|
|
/// 'From' to be uses of 'To'. This must update the uniquing data structures
|
|
/// etc.
|
|
///
|
|
/// Note that we intentionally replace all uses of From with To here. Consider
|
|
/// a large array that uses 'From' 1000 times. By handling this case all here,
|
|
/// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
|
|
/// single invocation handles all 1000 uses. Handling them one at a time would
|
|
/// work, but would be really slow because it would have to unique each updated
|
|
/// array instance.
|
|
///
|
|
void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
|
|
Use *U) {
|
|
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
|
|
Constant *ToC = cast<Constant>(To);
|
|
|
|
LLVMContextImpl *pImpl = getType()->getContext().pImpl;
|
|
|
|
std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
|
|
Lookup.first.first = cast<ArrayType>(getType());
|
|
Lookup.second = this;
|
|
|
|
std::vector<Constant*> &Values = Lookup.first.second;
|
|
Values.reserve(getNumOperands()); // Build replacement array.
|
|
|
|
// Fill values with the modified operands of the constant array. Also,
|
|
// compute whether this turns into an all-zeros array.
|
|
bool isAllZeros = false;
|
|
unsigned NumUpdated = 0;
|
|
if (!ToC->isNullValue()) {
|
|
for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
|
|
Constant *Val = cast<Constant>(O->get());
|
|
if (Val == From) {
|
|
Val = ToC;
|
|
++NumUpdated;
|
|
}
|
|
Values.push_back(Val);
|
|
}
|
|
} else {
|
|
isAllZeros = true;
|
|
for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
|
|
Constant *Val = cast<Constant>(O->get());
|
|
if (Val == From) {
|
|
Val = ToC;
|
|
++NumUpdated;
|
|
}
|
|
Values.push_back(Val);
|
|
if (isAllZeros) isAllZeros = Val->isNullValue();
|
|
}
|
|
}
|
|
|
|
Constant *Replacement = 0;
|
|
if (isAllZeros) {
|
|
Replacement = ConstantAggregateZero::get(getType());
|
|
} else {
|
|
// Check to see if we have this array type already.
|
|
bool Exists;
|
|
LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
|
|
pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
|
|
|
|
if (Exists) {
|
|
Replacement = I->second;
|
|
} else {
|
|
// Okay, the new shape doesn't exist in the system yet. Instead of
|
|
// creating a new constant array, inserting it, replaceallusesof'ing the
|
|
// old with the new, then deleting the old... just update the current one
|
|
// in place!
|
|
pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
|
|
|
|
// Update to the new value. Optimize for the case when we have a single
|
|
// operand that we're changing, but handle bulk updates efficiently.
|
|
if (NumUpdated == 1) {
|
|
unsigned OperandToUpdate = U - OperandList;
|
|
assert(getOperand(OperandToUpdate) == From &&
|
|
"ReplaceAllUsesWith broken!");
|
|
setOperand(OperandToUpdate, ToC);
|
|
} else {
|
|
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
|
|
if (getOperand(i) == From)
|
|
setOperand(i, ToC);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Otherwise, I do need to replace this with an existing value.
|
|
assert(Replacement != this && "I didn't contain From!");
|
|
|
|
// Everyone using this now uses the replacement.
|
|
replaceAllUsesWith(Replacement);
|
|
|
|
// Delete the old constant!
|
|
destroyConstant();
|
|
}
|
|
|
|
void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
|
|
Use *U) {
|
|
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
|
|
Constant *ToC = cast<Constant>(To);
|
|
|
|
unsigned OperandToUpdate = U-OperandList;
|
|
assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
|
|
|
|
std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
|
|
Lookup.first.first = cast<StructType>(getType());
|
|
Lookup.second = this;
|
|
std::vector<Constant*> &Values = Lookup.first.second;
|
|
Values.reserve(getNumOperands()); // Build replacement struct.
|
|
|
|
|
|
// Fill values with the modified operands of the constant struct. Also,
|
|
// compute whether this turns into an all-zeros struct.
|
|
bool isAllZeros = false;
|
|
if (!ToC->isNullValue()) {
|
|
for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
|
|
Values.push_back(cast<Constant>(O->get()));
|
|
} else {
|
|
isAllZeros = true;
|
|
for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
|
|
Constant *Val = cast<Constant>(O->get());
|
|
Values.push_back(Val);
|
|
if (isAllZeros) isAllZeros = Val->isNullValue();
|
|
}
|
|
}
|
|
Values[OperandToUpdate] = ToC;
|
|
|
|
LLVMContextImpl *pImpl = getContext().pImpl;
|
|
|
|
Constant *Replacement = 0;
|
|
if (isAllZeros) {
|
|
Replacement = ConstantAggregateZero::get(getType());
|
|
} else {
|
|
// Check to see if we have this struct type already.
|
|
bool Exists;
|
|
LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
|
|
pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
|
|
|
|
if (Exists) {
|
|
Replacement = I->second;
|
|
} else {
|
|
// Okay, the new shape doesn't exist in the system yet. Instead of
|
|
// creating a new constant struct, inserting it, replaceallusesof'ing the
|
|
// old with the new, then deleting the old... just update the current one
|
|
// in place!
|
|
pImpl->StructConstants.MoveConstantToNewSlot(this, I);
|
|
|
|
// Update to the new value.
|
|
setOperand(OperandToUpdate, ToC);
|
|
return;
|
|
}
|
|
}
|
|
|
|
assert(Replacement != this && "I didn't contain From!");
|
|
|
|
// Everyone using this now uses the replacement.
|
|
replaceAllUsesWith(Replacement);
|
|
|
|
// Delete the old constant!
|
|
destroyConstant();
|
|
}
|
|
|
|
void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
|
|
Use *U) {
|
|
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
|
|
|
|
std::vector<Constant*> Values;
|
|
Values.reserve(getNumOperands()); // Build replacement array...
|
|
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
|
|
Constant *Val = getOperand(i);
|
|
if (Val == From) Val = cast<Constant>(To);
|
|
Values.push_back(Val);
|
|
}
|
|
|
|
Constant *Replacement = get(Values);
|
|
assert(Replacement != this && "I didn't contain From!");
|
|
|
|
// Everyone using this now uses the replacement.
|
|
replaceAllUsesWith(Replacement);
|
|
|
|
// Delete the old constant!
|
|
destroyConstant();
|
|
}
|
|
|
|
void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
|
|
Use *U) {
|
|
assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
|
|
Constant *To = cast<Constant>(ToV);
|
|
|
|
Constant *Replacement = 0;
|
|
if (getOpcode() == Instruction::GetElementPtr) {
|
|
SmallVector<Constant*, 8> Indices;
|
|
Constant *Pointer = getOperand(0);
|
|
Indices.reserve(getNumOperands()-1);
|
|
if (Pointer == From) Pointer = To;
|
|
|
|
for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
|
|
Constant *Val = getOperand(i);
|
|
if (Val == From) Val = To;
|
|
Indices.push_back(Val);
|
|
}
|
|
Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
|
|
cast<GEPOperator>(this)->isInBounds());
|
|
} else if (getOpcode() == Instruction::ExtractValue) {
|
|
Constant *Agg = getOperand(0);
|
|
if (Agg == From) Agg = To;
|
|
|
|
ArrayRef<unsigned> Indices = getIndices();
|
|
Replacement = ConstantExpr::getExtractValue(Agg, Indices);
|
|
} else if (getOpcode() == Instruction::InsertValue) {
|
|
Constant *Agg = getOperand(0);
|
|
Constant *Val = getOperand(1);
|
|
if (Agg == From) Agg = To;
|
|
if (Val == From) Val = To;
|
|
|
|
ArrayRef<unsigned> Indices = getIndices();
|
|
Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
|
|
} else if (isCast()) {
|
|
assert(getOperand(0) == From && "Cast only has one use!");
|
|
Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
|
|
} else if (getOpcode() == Instruction::Select) {
|
|
Constant *C1 = getOperand(0);
|
|
Constant *C2 = getOperand(1);
|
|
Constant *C3 = getOperand(2);
|
|
if (C1 == From) C1 = To;
|
|
if (C2 == From) C2 = To;
|
|
if (C3 == From) C3 = To;
|
|
Replacement = ConstantExpr::getSelect(C1, C2, C3);
|
|
} else if (getOpcode() == Instruction::ExtractElement) {
|
|
Constant *C1 = getOperand(0);
|
|
Constant *C2 = getOperand(1);
|
|
if (C1 == From) C1 = To;
|
|
if (C2 == From) C2 = To;
|
|
Replacement = ConstantExpr::getExtractElement(C1, C2);
|
|
} else if (getOpcode() == Instruction::InsertElement) {
|
|
Constant *C1 = getOperand(0);
|
|
Constant *C2 = getOperand(1);
|
|
Constant *C3 = getOperand(1);
|
|
if (C1 == From) C1 = To;
|
|
if (C2 == From) C2 = To;
|
|
if (C3 == From) C3 = To;
|
|
Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
|
|
} else if (getOpcode() == Instruction::ShuffleVector) {
|
|
Constant *C1 = getOperand(0);
|
|
Constant *C2 = getOperand(1);
|
|
Constant *C3 = getOperand(2);
|
|
if (C1 == From) C1 = To;
|
|
if (C2 == From) C2 = To;
|
|
if (C3 == From) C3 = To;
|
|
Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
|
|
} else if (isCompare()) {
|
|
Constant *C1 = getOperand(0);
|
|
Constant *C2 = getOperand(1);
|
|
if (C1 == From) C1 = To;
|
|
if (C2 == From) C2 = To;
|
|
if (getOpcode() == Instruction::ICmp)
|
|
Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
|
|
else {
|
|
assert(getOpcode() == Instruction::FCmp);
|
|
Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
|
|
}
|
|
} else if (getNumOperands() == 2) {
|
|
Constant *C1 = getOperand(0);
|
|
Constant *C2 = getOperand(1);
|
|
if (C1 == From) C1 = To;
|
|
if (C2 == From) C2 = To;
|
|
Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
|
|
} else {
|
|
llvm_unreachable("Unknown ConstantExpr type!");
|
|
return;
|
|
}
|
|
|
|
assert(Replacement != this && "I didn't contain From!");
|
|
|
|
// Everyone using this now uses the replacement.
|
|
replaceAllUsesWith(Replacement);
|
|
|
|
// Delete the old constant!
|
|
destroyConstant();
|
|
}
|