1 //===-- Constants.cpp - Implement Constant nodes --------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Constant* classes.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Constants.h"
15 #include "LLVMContextImpl.h"
16 #include "ConstantFold.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/GlobalValue.h"
19 #include "llvm/Instructions.h"
20 #include "llvm/Module.h"
21 #include "llvm/Operator.h"
22 #include "llvm/ADT/FoldingSet.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/StringMap.h"
25 #include "llvm/Support/Compiler.h"
26 #include "llvm/Support/Debug.h"
27 #include "llvm/Support/ErrorHandling.h"
28 #include "llvm/Support/ManagedStatic.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include "llvm/Support/GetElementPtrTypeIterator.h"
32 #include "llvm/ADT/DenseMap.h"
33 #include "llvm/ADT/SmallVector.h"
34 #include "llvm/ADT/STLExtras.h"
39 //===----------------------------------------------------------------------===//
41 //===----------------------------------------------------------------------===//
43 void Constant::anchor() { }
45 bool Constant::isNegativeZeroValue() const {
46 // Floating point values have an explicit -0.0 value.
47 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
48 return CFP->isZero() && CFP->isNegative();
50 // Otherwise, just use +0.0.
54 bool Constant::isNullValue() const {
56 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
60 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
61 return CFP->isZero() && !CFP->isNegative();
63 // constant zero is zero for aggregates and cpnull is null for pointers.
64 return isa<ConstantAggregateZero>(this) || isa<ConstantPointerNull>(this);
67 bool Constant::isAllOnesValue() const {
68 // Check for -1 integers
69 if (const ConstantInt *CI = dyn_cast<ConstantInt>(this))
70 return CI->isMinusOne();
72 // Check for FP which are bitcasted from -1 integers
73 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(this))
74 return CFP->getValueAPF().bitcastToAPInt().isAllOnesValue();
76 // Check for constant vectors which are splats of -1 values.
77 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this))
78 if (Constant *Splat = CV->getSplatValue())
79 return Splat->isAllOnesValue();
84 // Constructor to create a '0' constant of arbitrary type...
85 Constant *Constant::getNullValue(Type *Ty) {
86 switch (Ty->getTypeID()) {
87 case Type::IntegerTyID:
88 return ConstantInt::get(Ty, 0);
90 return ConstantFP::get(Ty->getContext(),
91 APFloat::getZero(APFloat::IEEEhalf));
93 return ConstantFP::get(Ty->getContext(),
94 APFloat::getZero(APFloat::IEEEsingle));
95 case Type::DoubleTyID:
96 return ConstantFP::get(Ty->getContext(),
97 APFloat::getZero(APFloat::IEEEdouble));
98 case Type::X86_FP80TyID:
99 return ConstantFP::get(Ty->getContext(),
100 APFloat::getZero(APFloat::x87DoubleExtended));
101 case Type::FP128TyID:
102 return ConstantFP::get(Ty->getContext(),
103 APFloat::getZero(APFloat::IEEEquad));
104 case Type::PPC_FP128TyID:
105 return ConstantFP::get(Ty->getContext(),
106 APFloat(APInt::getNullValue(128)));
107 case Type::PointerTyID:
108 return ConstantPointerNull::get(cast<PointerType>(Ty));
109 case Type::StructTyID:
110 case Type::ArrayTyID:
111 case Type::VectorTyID:
112 return ConstantAggregateZero::get(Ty);
114 // Function, Label, or Opaque type?
115 assert(0 && "Cannot create a null constant of that type!");
120 Constant *Constant::getIntegerValue(Type *Ty, const APInt &V) {
121 Type *ScalarTy = Ty->getScalarType();
123 // Create the base integer constant.
124 Constant *C = ConstantInt::get(Ty->getContext(), V);
126 // Convert an integer to a pointer, if necessary.
127 if (PointerType *PTy = dyn_cast<PointerType>(ScalarTy))
128 C = ConstantExpr::getIntToPtr(C, PTy);
130 // Broadcast a scalar to a vector, if necessary.
131 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
132 C = ConstantVector::get(std::vector<Constant *>(VTy->getNumElements(), C));
137 Constant *Constant::getAllOnesValue(Type *Ty) {
138 if (IntegerType *ITy = dyn_cast<IntegerType>(Ty))
139 return ConstantInt::get(Ty->getContext(),
140 APInt::getAllOnesValue(ITy->getBitWidth()));
142 if (Ty->isFloatingPointTy()) {
143 APFloat FL = APFloat::getAllOnesValue(Ty->getPrimitiveSizeInBits(),
144 !Ty->isPPC_FP128Ty());
145 return ConstantFP::get(Ty->getContext(), FL);
148 SmallVector<Constant*, 16> Elts;
149 VectorType *VTy = cast<VectorType>(Ty);
150 Elts.resize(VTy->getNumElements(), getAllOnesValue(VTy->getElementType()));
151 assert(Elts[0] && "Invalid AllOnes value!");
152 return cast<ConstantVector>(ConstantVector::get(Elts));
155 void Constant::destroyConstantImpl() {
156 // When a Constant is destroyed, there may be lingering
157 // references to the constant by other constants in the constant pool. These
158 // constants are implicitly dependent on the module that is being deleted,
159 // but they don't know that. Because we only find out when the CPV is
160 // deleted, we must now notify all of our users (that should only be
161 // Constants) that they are, in fact, invalid now and should be deleted.
163 while (!use_empty()) {
164 Value *V = use_back();
165 #ifndef NDEBUG // Only in -g mode...
166 if (!isa<Constant>(V)) {
167 dbgs() << "While deleting: " << *this
168 << "\n\nUse still stuck around after Def is destroyed: "
172 assert(isa<Constant>(V) && "References remain to Constant being destroyed");
173 Constant *CV = cast<Constant>(V);
174 CV->destroyConstant();
176 // The constant should remove itself from our use list...
177 assert((use_empty() || use_back() != V) && "Constant not removed!");
180 // Value has no outstanding references it is safe to delete it now...
184 /// canTrap - Return true if evaluation of this constant could trap. This is
185 /// true for things like constant expressions that could divide by zero.
186 bool Constant::canTrap() const {
187 assert(getType()->isFirstClassType() && "Cannot evaluate aggregate vals!");
188 // The only thing that could possibly trap are constant exprs.
189 const ConstantExpr *CE = dyn_cast<ConstantExpr>(this);
190 if (!CE) return false;
192 // ConstantExpr traps if any operands can trap.
193 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
194 if (CE->getOperand(i)->canTrap())
197 // Otherwise, only specific operations can trap.
198 switch (CE->getOpcode()) {
201 case Instruction::UDiv:
202 case Instruction::SDiv:
203 case Instruction::FDiv:
204 case Instruction::URem:
205 case Instruction::SRem:
206 case Instruction::FRem:
207 // Div and rem can trap if the RHS is not known to be non-zero.
208 if (!isa<ConstantInt>(CE->getOperand(1)) ||CE->getOperand(1)->isNullValue())
214 /// isConstantUsed - Return true if the constant has users other than constant
215 /// exprs and other dangling things.
216 bool Constant::isConstantUsed() const {
217 for (const_use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
218 const Constant *UC = dyn_cast<Constant>(*UI);
219 if (UC == 0 || isa<GlobalValue>(UC))
222 if (UC->isConstantUsed())
230 /// getRelocationInfo - This method classifies the entry according to
231 /// whether or not it may generate a relocation entry. This must be
232 /// conservative, so if it might codegen to a relocatable entry, it should say
233 /// so. The return values are:
235 /// NoRelocation: This constant pool entry is guaranteed to never have a
236 /// relocation applied to it (because it holds a simple constant like
238 /// LocalRelocation: This entry has relocations, but the entries are
239 /// guaranteed to be resolvable by the static linker, so the dynamic
240 /// linker will never see them.
241 /// GlobalRelocations: This entry may have arbitrary relocations.
243 /// FIXME: This really should not be in VMCore.
244 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
245 if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
246 if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
247 return LocalRelocation; // Local to this file/library.
248 return GlobalRelocations; // Global reference.
251 if (const BlockAddress *BA = dyn_cast<BlockAddress>(this))
252 return BA->getFunction()->getRelocationInfo();
254 // While raw uses of blockaddress need to be relocated, differences between
255 // two of them don't when they are for labels in the same function. This is a
256 // common idiom when creating a table for the indirect goto extension, so we
257 // handle it efficiently here.
258 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(this))
259 if (CE->getOpcode() == Instruction::Sub) {
260 ConstantExpr *LHS = dyn_cast<ConstantExpr>(CE->getOperand(0));
261 ConstantExpr *RHS = dyn_cast<ConstantExpr>(CE->getOperand(1));
263 LHS->getOpcode() == Instruction::PtrToInt &&
264 RHS->getOpcode() == Instruction::PtrToInt &&
265 isa<BlockAddress>(LHS->getOperand(0)) &&
266 isa<BlockAddress>(RHS->getOperand(0)) &&
267 cast<BlockAddress>(LHS->getOperand(0))->getFunction() ==
268 cast<BlockAddress>(RHS->getOperand(0))->getFunction())
272 PossibleRelocationsTy Result = NoRelocation;
273 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
274 Result = std::max(Result,
275 cast<Constant>(getOperand(i))->getRelocationInfo());
281 /// getVectorElements - This method, which is only valid on constant of vector
282 /// type, returns the elements of the vector in the specified smallvector.
283 /// This handles breaking down a vector undef into undef elements, etc. For
284 /// constant exprs and other cases we can't handle, we return an empty vector.
285 void Constant::getVectorElements(SmallVectorImpl<Constant*> &Elts) const {
286 assert(getType()->isVectorTy() && "Not a vector constant!");
288 if (const ConstantVector *CV = dyn_cast<ConstantVector>(this)) {
289 for (unsigned i = 0, e = CV->getNumOperands(); i != e; ++i)
290 Elts.push_back(CV->getOperand(i));
294 VectorType *VT = cast<VectorType>(getType());
295 if (isa<ConstantAggregateZero>(this)) {
296 Elts.assign(VT->getNumElements(),
297 Constant::getNullValue(VT->getElementType()));
301 if (isa<UndefValue>(this)) {
302 Elts.assign(VT->getNumElements(), UndefValue::get(VT->getElementType()));
306 // Unknown type, must be constant expr etc.
310 /// removeDeadUsersOfConstant - If the specified constantexpr is dead, remove
311 /// it. This involves recursively eliminating any dead users of the
313 static bool removeDeadUsersOfConstant(const Constant *C) {
314 if (isa<GlobalValue>(C)) return false; // Cannot remove this
316 while (!C->use_empty()) {
317 const Constant *User = dyn_cast<Constant>(C->use_back());
318 if (!User) return false; // Non-constant usage;
319 if (!removeDeadUsersOfConstant(User))
320 return false; // Constant wasn't dead
323 const_cast<Constant*>(C)->destroyConstant();
328 /// removeDeadConstantUsers - If there are any dead constant users dangling
329 /// off of this constant, remove them. This method is useful for clients
330 /// that want to check to see if a global is unused, but don't want to deal
331 /// with potentially dead constants hanging off of the globals.
332 void Constant::removeDeadConstantUsers() const {
333 Value::const_use_iterator I = use_begin(), E = use_end();
334 Value::const_use_iterator LastNonDeadUser = E;
336 const Constant *User = dyn_cast<Constant>(*I);
343 if (!removeDeadUsersOfConstant(User)) {
344 // If the constant wasn't dead, remember that this was the last live use
345 // and move on to the next constant.
351 // If the constant was dead, then the iterator is invalidated.
352 if (LastNonDeadUser == E) {
364 //===----------------------------------------------------------------------===//
366 //===----------------------------------------------------------------------===//
368 void ConstantInt::anchor() { }
370 ConstantInt::ConstantInt(IntegerType *Ty, const APInt& V)
371 : Constant(Ty, ConstantIntVal, 0, 0), Val(V) {
372 assert(V.getBitWidth() == Ty->getBitWidth() && "Invalid constant for type");
375 ConstantInt *ConstantInt::getTrue(LLVMContext &Context) {
376 LLVMContextImpl *pImpl = Context.pImpl;
377 if (!pImpl->TheTrueVal)
378 pImpl->TheTrueVal = ConstantInt::get(Type::getInt1Ty(Context), 1);
379 return pImpl->TheTrueVal;
382 ConstantInt *ConstantInt::getFalse(LLVMContext &Context) {
383 LLVMContextImpl *pImpl = Context.pImpl;
384 if (!pImpl->TheFalseVal)
385 pImpl->TheFalseVal = ConstantInt::get(Type::getInt1Ty(Context), 0);
386 return pImpl->TheFalseVal;
389 Constant *ConstantInt::getTrue(Type *Ty) {
390 VectorType *VTy = dyn_cast<VectorType>(Ty);
392 assert(Ty->isIntegerTy(1) && "True must be i1 or vector of i1.");
393 return ConstantInt::getTrue(Ty->getContext());
395 assert(VTy->getElementType()->isIntegerTy(1) &&
396 "True must be vector of i1 or i1.");
397 SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
398 ConstantInt::getTrue(Ty->getContext()));
399 return ConstantVector::get(Splat);
402 Constant *ConstantInt::getFalse(Type *Ty) {
403 VectorType *VTy = dyn_cast<VectorType>(Ty);
405 assert(Ty->isIntegerTy(1) && "False must be i1 or vector of i1.");
406 return ConstantInt::getFalse(Ty->getContext());
408 assert(VTy->getElementType()->isIntegerTy(1) &&
409 "False must be vector of i1 or i1.");
410 SmallVector<Constant*, 16> Splat(VTy->getNumElements(),
411 ConstantInt::getFalse(Ty->getContext()));
412 return ConstantVector::get(Splat);
416 // Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
417 // as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
418 // operator== and operator!= to ensure that the DenseMap doesn't attempt to
419 // compare APInt's of different widths, which would violate an APInt class
420 // invariant which generates an assertion.
421 ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
422 // Get the corresponding integer type for the bit width of the value.
423 IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
424 // get an existing value or the insertion position
425 DenseMapAPIntKeyInfo::KeyTy Key(V, ITy);
426 ConstantInt *&Slot = Context.pImpl->IntConstants[Key];
427 if (!Slot) Slot = new ConstantInt(ITy, V);
431 Constant *ConstantInt::get(Type *Ty, uint64_t V, bool isSigned) {
432 Constant *C = get(cast<IntegerType>(Ty->getScalarType()), V, isSigned);
434 // For vectors, broadcast the value.
435 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
436 return ConstantVector::get(SmallVector<Constant*,
437 16>(VTy->getNumElements(), C));
442 ConstantInt* ConstantInt::get(IntegerType* Ty, uint64_t V,
444 return get(Ty->getContext(), APInt(Ty->getBitWidth(), V, isSigned));
447 ConstantInt* ConstantInt::getSigned(IntegerType* Ty, int64_t V) {
448 return get(Ty, V, true);
451 Constant *ConstantInt::getSigned(Type *Ty, int64_t V) {
452 return get(Ty, V, true);
455 Constant *ConstantInt::get(Type* Ty, const APInt& V) {
456 ConstantInt *C = get(Ty->getContext(), V);
457 assert(C->getType() == Ty->getScalarType() &&
458 "ConstantInt type doesn't match the type implied by its value!");
460 // For vectors, broadcast the value.
461 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
462 return ConstantVector::get(
463 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
468 ConstantInt* ConstantInt::get(IntegerType* Ty, StringRef Str,
470 return get(Ty->getContext(), APInt(Ty->getBitWidth(), Str, radix));
473 //===----------------------------------------------------------------------===//
475 //===----------------------------------------------------------------------===//
477 static const fltSemantics *TypeToFloatSemantics(Type *Ty) {
479 return &APFloat::IEEEhalf;
481 return &APFloat::IEEEsingle;
482 if (Ty->isDoubleTy())
483 return &APFloat::IEEEdouble;
484 if (Ty->isX86_FP80Ty())
485 return &APFloat::x87DoubleExtended;
486 else if (Ty->isFP128Ty())
487 return &APFloat::IEEEquad;
489 assert(Ty->isPPC_FP128Ty() && "Unknown FP format");
490 return &APFloat::PPCDoubleDouble;
493 void ConstantFP::anchor() { }
495 /// get() - This returns a constant fp for the specified value in the
496 /// specified type. This should only be used for simple constant values like
497 /// 2.0/1.0 etc, that are known-valid both as double and as the target format.
498 Constant *ConstantFP::get(Type* Ty, double V) {
499 LLVMContext &Context = Ty->getContext();
503 FV.convert(*TypeToFloatSemantics(Ty->getScalarType()),
504 APFloat::rmNearestTiesToEven, &ignored);
505 Constant *C = get(Context, FV);
507 // For vectors, broadcast the value.
508 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
509 return ConstantVector::get(
510 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
516 Constant *ConstantFP::get(Type* Ty, StringRef Str) {
517 LLVMContext &Context = Ty->getContext();
519 APFloat FV(*TypeToFloatSemantics(Ty->getScalarType()), Str);
520 Constant *C = get(Context, FV);
522 // For vectors, broadcast the value.
523 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
524 return ConstantVector::get(
525 SmallVector<Constant *, 16>(VTy->getNumElements(), C));
531 ConstantFP* ConstantFP::getNegativeZero(Type* Ty) {
532 LLVMContext &Context = Ty->getContext();
533 APFloat apf = cast <ConstantFP>(Constant::getNullValue(Ty))->getValueAPF();
535 return get(Context, apf);
539 Constant *ConstantFP::getZeroValueForNegation(Type* Ty) {
540 if (VectorType *PTy = dyn_cast<VectorType>(Ty))
541 if (PTy->getElementType()->isFloatingPointTy()) {
542 SmallVector<Constant*, 16> zeros(PTy->getNumElements(),
543 getNegativeZero(PTy->getElementType()));
544 return ConstantVector::get(zeros);
547 if (Ty->isFloatingPointTy())
548 return getNegativeZero(Ty);
550 return Constant::getNullValue(Ty);
554 // ConstantFP accessors.
555 ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
556 DenseMapAPFloatKeyInfo::KeyTy Key(V);
558 LLVMContextImpl* pImpl = Context.pImpl;
560 ConstantFP *&Slot = pImpl->FPConstants[Key];
564 if (&V.getSemantics() == &APFloat::IEEEhalf)
565 Ty = Type::getHalfTy(Context);
566 else if (&V.getSemantics() == &APFloat::IEEEsingle)
567 Ty = Type::getFloatTy(Context);
568 else if (&V.getSemantics() == &APFloat::IEEEdouble)
569 Ty = Type::getDoubleTy(Context);
570 else if (&V.getSemantics() == &APFloat::x87DoubleExtended)
571 Ty = Type::getX86_FP80Ty(Context);
572 else if (&V.getSemantics() == &APFloat::IEEEquad)
573 Ty = Type::getFP128Ty(Context);
575 assert(&V.getSemantics() == &APFloat::PPCDoubleDouble &&
576 "Unknown FP format");
577 Ty = Type::getPPC_FP128Ty(Context);
579 Slot = new ConstantFP(Ty, V);
585 ConstantFP *ConstantFP::getInfinity(Type *Ty, bool Negative) {
586 const fltSemantics &Semantics = *TypeToFloatSemantics(Ty);
587 return ConstantFP::get(Ty->getContext(),
588 APFloat::getInf(Semantics, Negative));
591 ConstantFP::ConstantFP(Type *Ty, const APFloat& V)
592 : Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
593 assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
597 bool ConstantFP::isExactlyValue(const APFloat &V) const {
598 return Val.bitwiseIsEqual(V);
601 //===----------------------------------------------------------------------===//
602 // ConstantXXX Classes
603 //===----------------------------------------------------------------------===//
606 ConstantArray::ConstantArray(ArrayType *T, ArrayRef<Constant *> V)
607 : Constant(T, ConstantArrayVal,
608 OperandTraits<ConstantArray>::op_end(this) - V.size(),
610 assert(V.size() == T->getNumElements() &&
611 "Invalid initializer vector for constant array");
612 for (unsigned i = 0, e = V.size(); i != e; ++i)
613 assert(V[i]->getType() == T->getElementType() &&
614 "Initializer for array element doesn't match array element type!");
615 std::copy(V.begin(), V.end(), op_begin());
618 Constant *ConstantArray::get(ArrayType *Ty, ArrayRef<Constant*> V) {
619 for (unsigned i = 0, e = V.size(); i != e; ++i) {
620 assert(V[i]->getType() == Ty->getElementType() &&
621 "Wrong type in array element initializer");
623 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
624 // If this is an all-zero array, return a ConstantAggregateZero object
627 if (!C->isNullValue())
628 return pImpl->ArrayConstants.getOrCreate(Ty, V);
630 for (unsigned i = 1, e = V.size(); i != e; ++i)
632 return pImpl->ArrayConstants.getOrCreate(Ty, V);
635 return ConstantAggregateZero::get(Ty);
638 /// ConstantArray::get(const string&) - Return an array that is initialized to
639 /// contain the specified string. If length is zero then a null terminator is
640 /// added to the specified string so that it may be used in a natural way.
641 /// Otherwise, the length parameter specifies how much of the string to use
642 /// and it won't be null terminated.
644 Constant *ConstantArray::get(LLVMContext &Context, StringRef Str,
646 std::vector<Constant*> ElementVals;
647 ElementVals.reserve(Str.size() + size_t(AddNull));
648 for (unsigned i = 0; i < Str.size(); ++i)
649 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), Str[i]));
651 // Add a null terminator to the string...
653 ElementVals.push_back(ConstantInt::get(Type::getInt8Ty(Context), 0));
656 ArrayType *ATy = ArrayType::get(Type::getInt8Ty(Context), ElementVals.size());
657 return get(ATy, ElementVals);
660 /// getTypeForElements - Return an anonymous struct type to use for a constant
661 /// with the specified set of elements. The list must not be empty.
662 StructType *ConstantStruct::getTypeForElements(LLVMContext &Context,
663 ArrayRef<Constant*> V,
665 SmallVector<Type*, 16> EltTypes;
666 for (unsigned i = 0, e = V.size(); i != e; ++i)
667 EltTypes.push_back(V[i]->getType());
669 return StructType::get(Context, EltTypes, Packed);
673 StructType *ConstantStruct::getTypeForElements(ArrayRef<Constant*> V,
676 "ConstantStruct::getTypeForElements cannot be called on empty list");
677 return getTypeForElements(V[0]->getContext(), V, Packed);
681 ConstantStruct::ConstantStruct(StructType *T, ArrayRef<Constant *> V)
682 : Constant(T, ConstantStructVal,
683 OperandTraits<ConstantStruct>::op_end(this) - V.size(),
685 assert(V.size() == T->getNumElements() &&
686 "Invalid initializer vector for constant structure");
687 for (unsigned i = 0, e = V.size(); i != e; ++i)
688 assert((T->isOpaque() || V[i]->getType() == T->getElementType(i)) &&
689 "Initializer for struct element doesn't match struct element type!");
690 std::copy(V.begin(), V.end(), op_begin());
693 // ConstantStruct accessors.
694 Constant *ConstantStruct::get(StructType *ST, ArrayRef<Constant*> V) {
695 // Create a ConstantAggregateZero value if all elements are zeros.
696 for (unsigned i = 0, e = V.size(); i != e; ++i)
697 if (!V[i]->isNullValue())
698 return ST->getContext().pImpl->StructConstants.getOrCreate(ST, V);
700 assert((ST->isOpaque() || ST->getNumElements() == V.size()) &&
701 "Incorrect # elements specified to ConstantStruct::get");
702 return ConstantAggregateZero::get(ST);
705 Constant *ConstantStruct::get(StructType *T, ...) {
707 SmallVector<Constant*, 8> Values;
709 while (Constant *Val = va_arg(ap, llvm::Constant*))
710 Values.push_back(Val);
712 return get(T, Values);
715 ConstantVector::ConstantVector(VectorType *T, ArrayRef<Constant *> V)
716 : Constant(T, ConstantVectorVal,
717 OperandTraits<ConstantVector>::op_end(this) - V.size(),
719 for (size_t i = 0, e = V.size(); i != e; i++)
720 assert(V[i]->getType() == T->getElementType() &&
721 "Initializer for vector element doesn't match vector element type!");
722 std::copy(V.begin(), V.end(), op_begin());
725 // ConstantVector accessors.
726 Constant *ConstantVector::get(ArrayRef<Constant*> V) {
727 assert(!V.empty() && "Vectors can't be empty");
728 VectorType *T = VectorType::get(V.front()->getType(), V.size());
729 LLVMContextImpl *pImpl = T->getContext().pImpl;
731 // If this is an all-undef or all-zero vector, return a
732 // ConstantAggregateZero or UndefValue.
734 bool isZero = C->isNullValue();
735 bool isUndef = isa<UndefValue>(C);
737 if (isZero || isUndef) {
738 for (unsigned i = 1, e = V.size(); i != e; ++i)
740 isZero = isUndef = false;
746 return ConstantAggregateZero::get(T);
748 return UndefValue::get(T);
750 return pImpl->VectorConstants.getOrCreate(T, V);
753 // Utility function for determining if a ConstantExpr is a CastOp or not. This
754 // can't be inline because we don't want to #include Instruction.h into
756 bool ConstantExpr::isCast() const {
757 return Instruction::isCast(getOpcode());
760 bool ConstantExpr::isCompare() const {
761 return getOpcode() == Instruction::ICmp || getOpcode() == Instruction::FCmp;
764 bool ConstantExpr::isGEPWithNoNotionalOverIndexing() const {
765 if (getOpcode() != Instruction::GetElementPtr) return false;
767 gep_type_iterator GEPI = gep_type_begin(this), E = gep_type_end(this);
768 User::const_op_iterator OI = llvm::next(this->op_begin());
770 // Skip the first index, as it has no static limit.
774 // The remaining indices must be compile-time known integers within the
775 // bounds of the corresponding notional static array types.
776 for (; GEPI != E; ++GEPI, ++OI) {
777 ConstantInt *CI = dyn_cast<ConstantInt>(*OI);
778 if (!CI) return false;
779 if (ArrayType *ATy = dyn_cast<ArrayType>(*GEPI))
780 if (CI->getValue().getActiveBits() > 64 ||
781 CI->getZExtValue() >= ATy->getNumElements())
785 // All the indices checked out.
789 bool ConstantExpr::hasIndices() const {
790 return getOpcode() == Instruction::ExtractValue ||
791 getOpcode() == Instruction::InsertValue;
794 ArrayRef<unsigned> ConstantExpr::getIndices() const {
795 if (const ExtractValueConstantExpr *EVCE =
796 dyn_cast<ExtractValueConstantExpr>(this))
797 return EVCE->Indices;
799 return cast<InsertValueConstantExpr>(this)->Indices;
802 unsigned ConstantExpr::getPredicate() const {
804 return ((const CompareConstantExpr*)this)->predicate;
807 /// getWithOperandReplaced - Return a constant expression identical to this
808 /// one, but with the specified operand set to the specified value.
810 ConstantExpr::getWithOperandReplaced(unsigned OpNo, Constant *Op) const {
811 assert(OpNo < getNumOperands() && "Operand num is out of range!");
812 assert(Op->getType() == getOperand(OpNo)->getType() &&
813 "Replacing operand with value of different type!");
814 if (getOperand(OpNo) == Op)
815 return const_cast<ConstantExpr*>(this);
817 Constant *Op0, *Op1, *Op2;
818 switch (getOpcode()) {
819 case Instruction::Trunc:
820 case Instruction::ZExt:
821 case Instruction::SExt:
822 case Instruction::FPTrunc:
823 case Instruction::FPExt:
824 case Instruction::UIToFP:
825 case Instruction::SIToFP:
826 case Instruction::FPToUI:
827 case Instruction::FPToSI:
828 case Instruction::PtrToInt:
829 case Instruction::IntToPtr:
830 case Instruction::BitCast:
831 return ConstantExpr::getCast(getOpcode(), Op, getType());
832 case Instruction::Select:
833 Op0 = (OpNo == 0) ? Op : getOperand(0);
834 Op1 = (OpNo == 1) ? Op : getOperand(1);
835 Op2 = (OpNo == 2) ? Op : getOperand(2);
836 return ConstantExpr::getSelect(Op0, Op1, Op2);
837 case Instruction::InsertElement:
838 Op0 = (OpNo == 0) ? Op : getOperand(0);
839 Op1 = (OpNo == 1) ? Op : getOperand(1);
840 Op2 = (OpNo == 2) ? Op : getOperand(2);
841 return ConstantExpr::getInsertElement(Op0, Op1, Op2);
842 case Instruction::ExtractElement:
843 Op0 = (OpNo == 0) ? Op : getOperand(0);
844 Op1 = (OpNo == 1) ? Op : getOperand(1);
845 return ConstantExpr::getExtractElement(Op0, Op1);
846 case Instruction::ShuffleVector:
847 Op0 = (OpNo == 0) ? Op : getOperand(0);
848 Op1 = (OpNo == 1) ? Op : getOperand(1);
849 Op2 = (OpNo == 2) ? Op : getOperand(2);
850 return ConstantExpr::getShuffleVector(Op0, Op1, Op2);
851 case Instruction::GetElementPtr: {
852 SmallVector<Constant*, 8> Ops;
853 Ops.resize(getNumOperands()-1);
854 for (unsigned i = 1, e = getNumOperands(); i != e; ++i)
855 Ops[i-1] = getOperand(i);
858 ConstantExpr::getGetElementPtr(Op, Ops,
859 cast<GEPOperator>(this)->isInBounds());
862 ConstantExpr::getGetElementPtr(getOperand(0), Ops,
863 cast<GEPOperator>(this)->isInBounds());
866 assert(getNumOperands() == 2 && "Must be binary operator?");
867 Op0 = (OpNo == 0) ? Op : getOperand(0);
868 Op1 = (OpNo == 1) ? Op : getOperand(1);
869 return ConstantExpr::get(getOpcode(), Op0, Op1, SubclassOptionalData);
873 /// getWithOperands - This returns the current constant expression with the
874 /// operands replaced with the specified values. The specified array must
875 /// have the same number of operands as our current one.
876 Constant *ConstantExpr::
877 getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const {
878 assert(Ops.size() == getNumOperands() && "Operand count mismatch!");
879 bool AnyChange = Ty != getType();
880 for (unsigned i = 0; i != Ops.size(); ++i)
881 AnyChange |= Ops[i] != getOperand(i);
883 if (!AnyChange) // No operands changed, return self.
884 return const_cast<ConstantExpr*>(this);
886 switch (getOpcode()) {
887 case Instruction::Trunc:
888 case Instruction::ZExt:
889 case Instruction::SExt:
890 case Instruction::FPTrunc:
891 case Instruction::FPExt:
892 case Instruction::UIToFP:
893 case Instruction::SIToFP:
894 case Instruction::FPToUI:
895 case Instruction::FPToSI:
896 case Instruction::PtrToInt:
897 case Instruction::IntToPtr:
898 case Instruction::BitCast:
899 return ConstantExpr::getCast(getOpcode(), Ops[0], Ty);
900 case Instruction::Select:
901 return ConstantExpr::getSelect(Ops[0], Ops[1], Ops[2]);
902 case Instruction::InsertElement:
903 return ConstantExpr::getInsertElement(Ops[0], Ops[1], Ops[2]);
904 case Instruction::ExtractElement:
905 return ConstantExpr::getExtractElement(Ops[0], Ops[1]);
906 case Instruction::ShuffleVector:
907 return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
908 case Instruction::GetElementPtr:
910 ConstantExpr::getGetElementPtr(Ops[0], Ops.slice(1),
911 cast<GEPOperator>(this)->isInBounds());
912 case Instruction::ICmp:
913 case Instruction::FCmp:
914 return ConstantExpr::getCompare(getPredicate(), Ops[0], Ops[1]);
916 assert(getNumOperands() == 2 && "Must be binary operator?");
917 return ConstantExpr::get(getOpcode(), Ops[0], Ops[1], SubclassOptionalData);
922 //===----------------------------------------------------------------------===//
923 // isValueValidForType implementations
925 bool ConstantInt::isValueValidForType(Type *Ty, uint64_t Val) {
926 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
927 if (Ty == Type::getInt1Ty(Ty->getContext()))
928 return Val == 0 || Val == 1;
930 return true; // always true, has to fit in largest type
931 uint64_t Max = (1ll << NumBits) - 1;
935 bool ConstantInt::isValueValidForType(Type *Ty, int64_t Val) {
936 unsigned NumBits = cast<IntegerType>(Ty)->getBitWidth(); // assert okay
937 if (Ty == Type::getInt1Ty(Ty->getContext()))
938 return Val == 0 || Val == 1 || Val == -1;
940 return true; // always true, has to fit in largest type
941 int64_t Min = -(1ll << (NumBits-1));
942 int64_t Max = (1ll << (NumBits-1)) - 1;
943 return (Val >= Min && Val <= Max);
946 bool ConstantFP::isValueValidForType(Type *Ty, const APFloat& Val) {
947 // convert modifies in place, so make a copy.
948 APFloat Val2 = APFloat(Val);
950 switch (Ty->getTypeID()) {
952 return false; // These can't be represented as floating point!
954 // FIXME rounding mode needs to be more flexible
955 case Type::HalfTyID: {
956 if (&Val2.getSemantics() == &APFloat::IEEEhalf)
958 Val2.convert(APFloat::IEEEhalf, APFloat::rmNearestTiesToEven, &losesInfo);
961 case Type::FloatTyID: {
962 if (&Val2.getSemantics() == &APFloat::IEEEsingle)
964 Val2.convert(APFloat::IEEEsingle, APFloat::rmNearestTiesToEven, &losesInfo);
967 case Type::DoubleTyID: {
968 if (&Val2.getSemantics() == &APFloat::IEEEhalf ||
969 &Val2.getSemantics() == &APFloat::IEEEsingle ||
970 &Val2.getSemantics() == &APFloat::IEEEdouble)
972 Val2.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &losesInfo);
975 case Type::X86_FP80TyID:
976 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
977 &Val2.getSemantics() == &APFloat::IEEEsingle ||
978 &Val2.getSemantics() == &APFloat::IEEEdouble ||
979 &Val2.getSemantics() == &APFloat::x87DoubleExtended;
980 case Type::FP128TyID:
981 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
982 &Val2.getSemantics() == &APFloat::IEEEsingle ||
983 &Val2.getSemantics() == &APFloat::IEEEdouble ||
984 &Val2.getSemantics() == &APFloat::IEEEquad;
985 case Type::PPC_FP128TyID:
986 return &Val2.getSemantics() == &APFloat::IEEEhalf ||
987 &Val2.getSemantics() == &APFloat::IEEEsingle ||
988 &Val2.getSemantics() == &APFloat::IEEEdouble ||
989 &Val2.getSemantics() == &APFloat::PPCDoubleDouble;
993 //===----------------------------------------------------------------------===//
994 // Factory Function Implementation
996 ConstantAggregateZero *ConstantAggregateZero::get(Type *Ty) {
997 assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
998 "Cannot create an aggregate zero of non-aggregate type!");
1000 ConstantAggregateZero *&Entry = Ty->getContext().pImpl->CAZConstants[Ty];
1002 Entry = new ConstantAggregateZero(Ty);
1007 /// destroyConstant - Remove the constant from the constant table...
1009 void ConstantAggregateZero::destroyConstant() {
1010 getContext().pImpl->CAZConstants.erase(getType());
1011 destroyConstantImpl();
1014 /// destroyConstant - Remove the constant from the constant table...
1016 void ConstantArray::destroyConstant() {
1017 getType()->getContext().pImpl->ArrayConstants.remove(this);
1018 destroyConstantImpl();
1021 /// isString - This method returns true if the array is an array of i8, and
1022 /// if the elements of the array are all ConstantInt's.
1023 bool ConstantArray::isString() const {
1024 // Check the element type for i8...
1025 if (!getType()->getElementType()->isIntegerTy(8))
1027 // Check the elements to make sure they are all integers, not constant
1029 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1030 if (!isa<ConstantInt>(getOperand(i)))
1035 /// isCString - This method returns true if the array is a string (see
1036 /// isString) and it ends in a null byte \\0 and does not contains any other
1037 /// null bytes except its terminator.
1038 bool ConstantArray::isCString() const {
1039 // Check the element type for i8...
1040 if (!getType()->getElementType()->isIntegerTy(8))
1043 // Last element must be a null.
1044 if (!getOperand(getNumOperands()-1)->isNullValue())
1046 // Other elements must be non-null integers.
1047 for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
1048 if (!isa<ConstantInt>(getOperand(i)))
1050 if (getOperand(i)->isNullValue())
1057 /// convertToString - Helper function for getAsString() and getAsCString().
1058 static std::string convertToString(const User *U, unsigned len) {
1060 Result.reserve(len);
1061 for (unsigned i = 0; i != len; ++i)
1062 Result.push_back((char)cast<ConstantInt>(U->getOperand(i))->getZExtValue());
1066 /// getAsString - If this array is isString(), then this method converts the
1067 /// array to an std::string and returns it. Otherwise, it asserts out.
1069 std::string ConstantArray::getAsString() const {
1070 assert(isString() && "Not a string!");
1071 return convertToString(this, getNumOperands());
1075 /// getAsCString - If this array is isCString(), then this method converts the
1076 /// array (without the trailing null byte) to an std::string and returns it.
1077 /// Otherwise, it asserts out.
1079 std::string ConstantArray::getAsCString() const {
1080 assert(isCString() && "Not a string!");
1081 return convertToString(this, getNumOperands() - 1);
1085 //---- ConstantStruct::get() implementation...
1088 // destroyConstant - Remove the constant from the constant table...
1090 void ConstantStruct::destroyConstant() {
1091 getType()->getContext().pImpl->StructConstants.remove(this);
1092 destroyConstantImpl();
1095 // destroyConstant - Remove the constant from the constant table...
1097 void ConstantVector::destroyConstant() {
1098 getType()->getContext().pImpl->VectorConstants.remove(this);
1099 destroyConstantImpl();
1102 /// getSplatValue - If this is a splat constant, where all of the
1103 /// elements have the same value, return that value. Otherwise return null.
1104 Constant *ConstantVector::getSplatValue() const {
1105 // Check out first element.
1106 Constant *Elt = getOperand(0);
1107 // Then make sure all remaining elements point to the same value.
1108 for (unsigned I = 1, E = getNumOperands(); I < E; ++I)
1109 if (getOperand(I) != Elt)
1114 //---- ConstantPointerNull::get() implementation.
1117 ConstantPointerNull *ConstantPointerNull::get(PointerType *Ty) {
1118 ConstantPointerNull *&Entry = Ty->getContext().pImpl->CPNConstants[Ty];
1120 Entry = new ConstantPointerNull(Ty);
1125 // destroyConstant - Remove the constant from the constant table...
1127 void ConstantPointerNull::destroyConstant() {
1128 getContext().pImpl->CPNConstants.erase(getType());
1129 // Free the constant and any dangling references to it.
1130 destroyConstantImpl();
1134 //---- UndefValue::get() implementation.
1137 UndefValue *UndefValue::get(Type *Ty) {
1138 UndefValue *&Entry = Ty->getContext().pImpl->UVConstants[Ty];
1140 Entry = new UndefValue(Ty);
1145 // destroyConstant - Remove the constant from the constant table.
1147 void UndefValue::destroyConstant() {
1148 // Free the constant and any dangling references to it.
1149 getContext().pImpl->UVConstants.erase(getType());
1150 destroyConstantImpl();
1153 //---- BlockAddress::get() implementation.
1156 BlockAddress *BlockAddress::get(BasicBlock *BB) {
1157 assert(BB->getParent() != 0 && "Block must have a parent");
1158 return get(BB->getParent(), BB);
1161 BlockAddress *BlockAddress::get(Function *F, BasicBlock *BB) {
1163 F->getContext().pImpl->BlockAddresses[std::make_pair(F, BB)];
1165 BA = new BlockAddress(F, BB);
1167 assert(BA->getFunction() == F && "Basic block moved between functions");
1171 BlockAddress::BlockAddress(Function *F, BasicBlock *BB)
1172 : Constant(Type::getInt8PtrTy(F->getContext()), Value::BlockAddressVal,
1176 BB->AdjustBlockAddressRefCount(1);
1180 // destroyConstant - Remove the constant from the constant table.
1182 void BlockAddress::destroyConstant() {
1183 getFunction()->getType()->getContext().pImpl
1184 ->BlockAddresses.erase(std::make_pair(getFunction(), getBasicBlock()));
1185 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1186 destroyConstantImpl();
1189 void BlockAddress::replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
1190 // This could be replacing either the Basic Block or the Function. In either
1191 // case, we have to remove the map entry.
1192 Function *NewF = getFunction();
1193 BasicBlock *NewBB = getBasicBlock();
1196 NewF = cast<Function>(To);
1198 NewBB = cast<BasicBlock>(To);
1200 // See if the 'new' entry already exists, if not, just update this in place
1201 // and return early.
1202 BlockAddress *&NewBA =
1203 getContext().pImpl->BlockAddresses[std::make_pair(NewF, NewBB)];
1205 getBasicBlock()->AdjustBlockAddressRefCount(-1);
1207 // Remove the old entry, this can't cause the map to rehash (just a
1208 // tombstone will get added).
1209 getContext().pImpl->BlockAddresses.erase(std::make_pair(getFunction(),
1212 setOperand(0, NewF);
1213 setOperand(1, NewBB);
1214 getBasicBlock()->AdjustBlockAddressRefCount(1);
1218 // Otherwise, I do need to replace this with an existing value.
1219 assert(NewBA != this && "I didn't contain From!");
1221 // Everyone using this now uses the replacement.
1222 replaceAllUsesWith(NewBA);
1227 //---- ConstantExpr::get() implementations.
1230 /// This is a utility function to handle folding of casts and lookup of the
1231 /// cast in the ExprConstants map. It is used by the various get* methods below.
1232 static inline Constant *getFoldedCast(
1233 Instruction::CastOps opc, Constant *C, Type *Ty) {
1234 assert(Ty->isFirstClassType() && "Cannot cast to an aggregate type!");
1235 // Fold a few common cases
1236 if (Constant *FC = ConstantFoldCastInstruction(opc, C, Ty))
1239 LLVMContextImpl *pImpl = Ty->getContext().pImpl;
1241 // Look up the constant in the table first to ensure uniqueness
1242 std::vector<Constant*> argVec(1, C);
1243 ExprMapKeyType Key(opc, argVec);
1245 return pImpl->ExprConstants.getOrCreate(Ty, Key);
1248 Constant *ConstantExpr::getCast(unsigned oc, Constant *C, Type *Ty) {
1249 Instruction::CastOps opc = Instruction::CastOps(oc);
1250 assert(Instruction::isCast(opc) && "opcode out of range");
1251 assert(C && Ty && "Null arguments to getCast");
1252 assert(CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!");
1256 llvm_unreachable("Invalid cast opcode");
1257 case Instruction::Trunc: return getTrunc(C, Ty);
1258 case Instruction::ZExt: return getZExt(C, Ty);
1259 case Instruction::SExt: return getSExt(C, Ty);
1260 case Instruction::FPTrunc: return getFPTrunc(C, Ty);
1261 case Instruction::FPExt: return getFPExtend(C, Ty);
1262 case Instruction::UIToFP: return getUIToFP(C, Ty);
1263 case Instruction::SIToFP: return getSIToFP(C, Ty);
1264 case Instruction::FPToUI: return getFPToUI(C, Ty);
1265 case Instruction::FPToSI: return getFPToSI(C, Ty);
1266 case Instruction::PtrToInt: return getPtrToInt(C, Ty);
1267 case Instruction::IntToPtr: return getIntToPtr(C, Ty);
1268 case Instruction::BitCast: return getBitCast(C, Ty);
1272 Constant *ConstantExpr::getZExtOrBitCast(Constant *C, Type *Ty) {
1273 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1274 return getBitCast(C, Ty);
1275 return getZExt(C, Ty);
1278 Constant *ConstantExpr::getSExtOrBitCast(Constant *C, Type *Ty) {
1279 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1280 return getBitCast(C, Ty);
1281 return getSExt(C, Ty);
1284 Constant *ConstantExpr::getTruncOrBitCast(Constant *C, Type *Ty) {
1285 if (C->getType()->getScalarSizeInBits() == Ty->getScalarSizeInBits())
1286 return getBitCast(C, Ty);
1287 return getTrunc(C, Ty);
1290 Constant *ConstantExpr::getPointerCast(Constant *S, Type *Ty) {
1291 assert(S->getType()->isPointerTy() && "Invalid cast");
1292 assert((Ty->isIntegerTy() || Ty->isPointerTy()) && "Invalid cast");
1294 if (Ty->isIntegerTy())
1295 return getPtrToInt(S, Ty);
1296 return getBitCast(S, Ty);
1299 Constant *ConstantExpr::getIntegerCast(Constant *C, Type *Ty,
1301 assert(C->getType()->isIntOrIntVectorTy() &&
1302 Ty->isIntOrIntVectorTy() && "Invalid cast");
1303 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1304 unsigned DstBits = Ty->getScalarSizeInBits();
1305 Instruction::CastOps opcode =
1306 (SrcBits == DstBits ? Instruction::BitCast :
1307 (SrcBits > DstBits ? Instruction::Trunc :
1308 (isSigned ? Instruction::SExt : Instruction::ZExt)));
1309 return getCast(opcode, C, Ty);
1312 Constant *ConstantExpr::getFPCast(Constant *C, Type *Ty) {
1313 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1315 unsigned SrcBits = C->getType()->getScalarSizeInBits();
1316 unsigned DstBits = Ty->getScalarSizeInBits();
1317 if (SrcBits == DstBits)
1318 return C; // Avoid a useless cast
1319 Instruction::CastOps opcode =
1320 (SrcBits > DstBits ? Instruction::FPTrunc : Instruction::FPExt);
1321 return getCast(opcode, C, Ty);
1324 Constant *ConstantExpr::getTrunc(Constant *C, Type *Ty) {
1326 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1327 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1329 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1330 assert(C->getType()->isIntOrIntVectorTy() && "Trunc operand must be integer");
1331 assert(Ty->isIntOrIntVectorTy() && "Trunc produces only integral");
1332 assert(C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1333 "SrcTy must be larger than DestTy for Trunc!");
1335 return getFoldedCast(Instruction::Trunc, C, Ty);
1338 Constant *ConstantExpr::getSExt(Constant *C, Type *Ty) {
1340 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1341 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1343 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1344 assert(C->getType()->isIntOrIntVectorTy() && "SExt operand must be integral");
1345 assert(Ty->isIntOrIntVectorTy() && "SExt produces only integer");
1346 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1347 "SrcTy must be smaller than DestTy for SExt!");
1349 return getFoldedCast(Instruction::SExt, C, Ty);
1352 Constant *ConstantExpr::getZExt(Constant *C, Type *Ty) {
1354 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1355 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1357 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1358 assert(C->getType()->isIntOrIntVectorTy() && "ZEXt operand must be integral");
1359 assert(Ty->isIntOrIntVectorTy() && "ZExt produces only integer");
1360 assert(C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1361 "SrcTy must be smaller than DestTy for ZExt!");
1363 return getFoldedCast(Instruction::ZExt, C, Ty);
1366 Constant *ConstantExpr::getFPTrunc(Constant *C, Type *Ty) {
1368 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1369 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1371 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1372 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1373 C->getType()->getScalarSizeInBits() > Ty->getScalarSizeInBits()&&
1374 "This is an illegal floating point truncation!");
1375 return getFoldedCast(Instruction::FPTrunc, C, Ty);
1378 Constant *ConstantExpr::getFPExtend(Constant *C, Type *Ty) {
1380 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1381 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1383 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1384 assert(C->getType()->isFPOrFPVectorTy() && Ty->isFPOrFPVectorTy() &&
1385 C->getType()->getScalarSizeInBits() < Ty->getScalarSizeInBits()&&
1386 "This is an illegal floating point extension!");
1387 return getFoldedCast(Instruction::FPExt, C, Ty);
1390 Constant *ConstantExpr::getUIToFP(Constant *C, Type *Ty) {
1392 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1393 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1395 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1396 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1397 "This is an illegal uint to floating point cast!");
1398 return getFoldedCast(Instruction::UIToFP, C, Ty);
1401 Constant *ConstantExpr::getSIToFP(Constant *C, Type *Ty) {
1403 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1404 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1406 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1407 assert(C->getType()->isIntOrIntVectorTy() && Ty->isFPOrFPVectorTy() &&
1408 "This is an illegal sint to floating point cast!");
1409 return getFoldedCast(Instruction::SIToFP, C, Ty);
1412 Constant *ConstantExpr::getFPToUI(Constant *C, Type *Ty) {
1414 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1415 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1417 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1418 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1419 "This is an illegal floating point to uint cast!");
1420 return getFoldedCast(Instruction::FPToUI, C, Ty);
1423 Constant *ConstantExpr::getFPToSI(Constant *C, Type *Ty) {
1425 bool fromVec = C->getType()->getTypeID() == Type::VectorTyID;
1426 bool toVec = Ty->getTypeID() == Type::VectorTyID;
1428 assert((fromVec == toVec) && "Cannot convert from scalar to/from vector");
1429 assert(C->getType()->isFPOrFPVectorTy() && Ty->isIntOrIntVectorTy() &&
1430 "This is an illegal floating point to sint cast!");
1431 return getFoldedCast(Instruction::FPToSI, C, Ty);
1434 Constant *ConstantExpr::getPtrToInt(Constant *C, Type *DstTy) {
1435 assert(C->getType()->getScalarType()->isPointerTy() &&
1436 "PtrToInt source must be pointer or pointer vector");
1437 assert(DstTy->getScalarType()->isIntegerTy() &&
1438 "PtrToInt destination must be integer or integer vector");
1439 assert(C->getType()->getNumElements() == DstTy->getNumElements() &&
1440 "Invalid cast between a different number of vector elements");
1441 return getFoldedCast(Instruction::PtrToInt, C, DstTy);
1444 Constant *ConstantExpr::getIntToPtr(Constant *C, Type *DstTy) {
1445 assert(C->getType()->getScalarType()->isIntegerTy() &&
1446 "IntToPtr source must be integer or integer vector");
1447 assert(DstTy->getScalarType()->isPointerTy() &&
1448 "IntToPtr destination must be a pointer or pointer vector");
1449 assert(C->getType()->getNumElements() == DstTy->getNumElements() &&
1450 "Invalid cast between a different number of vector elements");
1451 return getFoldedCast(Instruction::IntToPtr, C, DstTy);
1454 Constant *ConstantExpr::getBitCast(Constant *C, Type *DstTy) {
1455 assert(CastInst::castIsValid(Instruction::BitCast, C, DstTy) &&
1456 "Invalid constantexpr bitcast!");
1458 // It is common to ask for a bitcast of a value to its own type, handle this
1460 if (C->getType() == DstTy) return C;
1462 return getFoldedCast(Instruction::BitCast, C, DstTy);
1465 Constant *ConstantExpr::get(unsigned Opcode, Constant *C1, Constant *C2,
1467 // Check the operands for consistency first.
1468 assert(Opcode >= Instruction::BinaryOpsBegin &&
1469 Opcode < Instruction::BinaryOpsEnd &&
1470 "Invalid opcode in binary constant expression");
1471 assert(C1->getType() == C2->getType() &&
1472 "Operand types in binary constant expression should match");
1476 case Instruction::Add:
1477 case Instruction::Sub:
1478 case Instruction::Mul:
1479 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1480 assert(C1->getType()->isIntOrIntVectorTy() &&
1481 "Tried to create an integer operation on a non-integer type!");
1483 case Instruction::FAdd:
1484 case Instruction::FSub:
1485 case Instruction::FMul:
1486 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1487 assert(C1->getType()->isFPOrFPVectorTy() &&
1488 "Tried to create a floating-point operation on a "
1489 "non-floating-point type!");
1491 case Instruction::UDiv:
1492 case Instruction::SDiv:
1493 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1494 assert(C1->getType()->isIntOrIntVectorTy() &&
1495 "Tried to create an arithmetic operation on a non-arithmetic type!");
1497 case Instruction::FDiv:
1498 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1499 assert(C1->getType()->isFPOrFPVectorTy() &&
1500 "Tried to create an arithmetic operation on a non-arithmetic type!");
1502 case Instruction::URem:
1503 case Instruction::SRem:
1504 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1505 assert(C1->getType()->isIntOrIntVectorTy() &&
1506 "Tried to create an arithmetic operation on a non-arithmetic type!");
1508 case Instruction::FRem:
1509 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1510 assert(C1->getType()->isFPOrFPVectorTy() &&
1511 "Tried to create an arithmetic operation on a non-arithmetic type!");
1513 case Instruction::And:
1514 case Instruction::Or:
1515 case Instruction::Xor:
1516 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1517 assert(C1->getType()->isIntOrIntVectorTy() &&
1518 "Tried to create a logical operation on a non-integral type!");
1520 case Instruction::Shl:
1521 case Instruction::LShr:
1522 case Instruction::AShr:
1523 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1524 assert(C1->getType()->isIntOrIntVectorTy() &&
1525 "Tried to create a shift operation on a non-integer type!");
1532 if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
1533 return FC; // Fold a few common cases.
1535 std::vector<Constant*> argVec(1, C1);
1536 argVec.push_back(C2);
1537 ExprMapKeyType Key(Opcode, argVec, 0, Flags);
1539 LLVMContextImpl *pImpl = C1->getContext().pImpl;
1540 return pImpl->ExprConstants.getOrCreate(C1->getType(), Key);
1543 Constant *ConstantExpr::getSizeOf(Type* Ty) {
1544 // sizeof is implemented as: (i64) gep (Ty*)null, 1
1545 // Note that a non-inbounds gep is used, as null isn't within any object.
1546 Constant *GEPIdx = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1547 Constant *GEP = getGetElementPtr(
1548 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1549 return getPtrToInt(GEP,
1550 Type::getInt64Ty(Ty->getContext()));
1553 Constant *ConstantExpr::getAlignOf(Type* Ty) {
1554 // alignof is implemented as: (i64) gep ({i1,Ty}*)null, 0, 1
1555 // Note that a non-inbounds gep is used, as null isn't within any object.
1557 StructType::get(Type::getInt1Ty(Ty->getContext()), Ty, NULL);
1558 Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
1559 Constant *Zero = ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0);
1560 Constant *One = ConstantInt::get(Type::getInt32Ty(Ty->getContext()), 1);
1561 Constant *Indices[2] = { Zero, One };
1562 Constant *GEP = getGetElementPtr(NullPtr, Indices);
1563 return getPtrToInt(GEP,
1564 Type::getInt64Ty(Ty->getContext()));
1567 Constant *ConstantExpr::getOffsetOf(StructType* STy, unsigned FieldNo) {
1568 return getOffsetOf(STy, ConstantInt::get(Type::getInt32Ty(STy->getContext()),
1572 Constant *ConstantExpr::getOffsetOf(Type* Ty, Constant *FieldNo) {
1573 // offsetof is implemented as: (i64) gep (Ty*)null, 0, FieldNo
1574 // Note that a non-inbounds gep is used, as null isn't within any object.
1575 Constant *GEPIdx[] = {
1576 ConstantInt::get(Type::getInt64Ty(Ty->getContext()), 0),
1579 Constant *GEP = getGetElementPtr(
1580 Constant::getNullValue(PointerType::getUnqual(Ty)), GEPIdx);
1581 return getPtrToInt(GEP,
1582 Type::getInt64Ty(Ty->getContext()));
1585 Constant *ConstantExpr::getCompare(unsigned short Predicate,
1586 Constant *C1, Constant *C2) {
1587 assert(C1->getType() == C2->getType() && "Op types should be identical!");
1589 switch (Predicate) {
1590 default: llvm_unreachable("Invalid CmpInst predicate");
1591 case CmpInst::FCMP_FALSE: case CmpInst::FCMP_OEQ: case CmpInst::FCMP_OGT:
1592 case CmpInst::FCMP_OGE: case CmpInst::FCMP_OLT: case CmpInst::FCMP_OLE:
1593 case CmpInst::FCMP_ONE: case CmpInst::FCMP_ORD: case CmpInst::FCMP_UNO:
1594 case CmpInst::FCMP_UEQ: case CmpInst::FCMP_UGT: case CmpInst::FCMP_UGE:
1595 case CmpInst::FCMP_ULT: case CmpInst::FCMP_ULE: case CmpInst::FCMP_UNE:
1596 case CmpInst::FCMP_TRUE:
1597 return getFCmp(Predicate, C1, C2);
1599 case CmpInst::ICMP_EQ: case CmpInst::ICMP_NE: case CmpInst::ICMP_UGT:
1600 case CmpInst::ICMP_UGE: case CmpInst::ICMP_ULT: case CmpInst::ICMP_ULE:
1601 case CmpInst::ICMP_SGT: case CmpInst::ICMP_SGE: case CmpInst::ICMP_SLT:
1602 case CmpInst::ICMP_SLE:
1603 return getICmp(Predicate, C1, C2);
1607 Constant *ConstantExpr::getSelect(Constant *C, Constant *V1, Constant *V2) {
1608 assert(!SelectInst::areInvalidOperands(C, V1, V2)&&"Invalid select operands");
1610 if (Constant *SC = ConstantFoldSelectInstruction(C, V1, V2))
1611 return SC; // Fold common cases
1613 std::vector<Constant*> argVec(3, C);
1616 ExprMapKeyType Key(Instruction::Select, argVec);
1618 LLVMContextImpl *pImpl = C->getContext().pImpl;
1619 return pImpl->ExprConstants.getOrCreate(V1->getType(), Key);
1622 Constant *ConstantExpr::getGetElementPtr(Constant *C, ArrayRef<Value *> Idxs,
1624 if (Constant *FC = ConstantFoldGetElementPtr(C, InBounds, Idxs))
1625 return FC; // Fold a few common cases.
1627 // Get the result type of the getelementptr!
1628 Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), Idxs);
1629 assert(Ty && "GEP indices invalid!");
1630 unsigned AS = cast<PointerType>(C->getType())->getAddressSpace();
1631 Type *ReqTy = Ty->getPointerTo(AS);
1633 assert(C->getType()->isPointerTy() &&
1634 "Non-pointer type for constant GetElementPtr expression");
1635 // Look up the constant in the table first to ensure uniqueness
1636 std::vector<Constant*> ArgVec;
1637 ArgVec.reserve(1 + Idxs.size());
1638 ArgVec.push_back(C);
1639 for (unsigned i = 0, e = Idxs.size(); i != e; ++i)
1640 ArgVec.push_back(cast<Constant>(Idxs[i]));
1641 const ExprMapKeyType Key(Instruction::GetElementPtr, ArgVec, 0,
1642 InBounds ? GEPOperator::IsInBounds : 0);
1644 LLVMContextImpl *pImpl = C->getContext().pImpl;
1645 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1649 ConstantExpr::getICmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1650 assert(LHS->getType() == RHS->getType());
1651 assert(pred >= ICmpInst::FIRST_ICMP_PREDICATE &&
1652 pred <= ICmpInst::LAST_ICMP_PREDICATE && "Invalid ICmp Predicate");
1654 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1655 return FC; // Fold a few common cases...
1657 // Look up the constant in the table first to ensure uniqueness
1658 std::vector<Constant*> ArgVec;
1659 ArgVec.push_back(LHS);
1660 ArgVec.push_back(RHS);
1661 // Get the key type with both the opcode and predicate
1662 const ExprMapKeyType Key(Instruction::ICmp, ArgVec, pred);
1664 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1665 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1666 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1668 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1669 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1673 ConstantExpr::getFCmp(unsigned short pred, Constant *LHS, Constant *RHS) {
1674 assert(LHS->getType() == RHS->getType());
1675 assert(pred <= FCmpInst::LAST_FCMP_PREDICATE && "Invalid FCmp Predicate");
1677 if (Constant *FC = ConstantFoldCompareInstruction(pred, LHS, RHS))
1678 return FC; // Fold a few common cases...
1680 // Look up the constant in the table first to ensure uniqueness
1681 std::vector<Constant*> ArgVec;
1682 ArgVec.push_back(LHS);
1683 ArgVec.push_back(RHS);
1684 // Get the key type with both the opcode and predicate
1685 const ExprMapKeyType Key(Instruction::FCmp, ArgVec, pred);
1687 Type *ResultTy = Type::getInt1Ty(LHS->getContext());
1688 if (VectorType *VT = dyn_cast<VectorType>(LHS->getType()))
1689 ResultTy = VectorType::get(ResultTy, VT->getNumElements());
1691 LLVMContextImpl *pImpl = LHS->getType()->getContext().pImpl;
1692 return pImpl->ExprConstants.getOrCreate(ResultTy, Key);
1695 Constant *ConstantExpr::getExtractElement(Constant *Val, Constant *Idx) {
1696 assert(Val->getType()->isVectorTy() &&
1697 "Tried to create extractelement operation on non-vector type!");
1698 assert(Idx->getType()->isIntegerTy(32) &&
1699 "Extractelement index must be i32 type!");
1701 if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
1702 return FC; // Fold a few common cases.
1704 // Look up the constant in the table first to ensure uniqueness
1705 std::vector<Constant*> ArgVec(1, Val);
1706 ArgVec.push_back(Idx);
1707 const ExprMapKeyType Key(Instruction::ExtractElement,ArgVec);
1709 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1710 Type *ReqTy = cast<VectorType>(Val->getType())->getElementType();
1711 return pImpl->ExprConstants.getOrCreate(ReqTy, Key);
1714 Constant *ConstantExpr::getInsertElement(Constant *Val, Constant *Elt,
1716 assert(Val->getType()->isVectorTy() &&
1717 "Tried to create insertelement operation on non-vector type!");
1718 assert(Elt->getType() == cast<VectorType>(Val->getType())->getElementType()
1719 && "Insertelement types must match!");
1720 assert(Idx->getType()->isIntegerTy(32) &&
1721 "Insertelement index must be i32 type!");
1723 if (Constant *FC = ConstantFoldInsertElementInstruction(Val, Elt, Idx))
1724 return FC; // Fold a few common cases.
1725 // Look up the constant in the table first to ensure uniqueness
1726 std::vector<Constant*> ArgVec(1, Val);
1727 ArgVec.push_back(Elt);
1728 ArgVec.push_back(Idx);
1729 const ExprMapKeyType Key(Instruction::InsertElement,ArgVec);
1731 LLVMContextImpl *pImpl = Val->getContext().pImpl;
1732 return pImpl->ExprConstants.getOrCreate(Val->getType(), Key);
1735 Constant *ConstantExpr::getShuffleVector(Constant *V1, Constant *V2,
1737 assert(ShuffleVectorInst::isValidOperands(V1, V2, Mask) &&
1738 "Invalid shuffle vector constant expr operands!");
1740 if (Constant *FC = ConstantFoldShuffleVectorInstruction(V1, V2, Mask))
1741 return FC; // Fold a few common cases.
1743 unsigned NElts = cast<VectorType>(Mask->getType())->getNumElements();
1744 Type *EltTy = cast<VectorType>(V1->getType())->getElementType();
1745 Type *ShufTy = VectorType::get(EltTy, NElts);
1747 // Look up the constant in the table first to ensure uniqueness
1748 std::vector<Constant*> ArgVec(1, V1);
1749 ArgVec.push_back(V2);
1750 ArgVec.push_back(Mask);
1751 const ExprMapKeyType Key(Instruction::ShuffleVector,ArgVec);
1753 LLVMContextImpl *pImpl = ShufTy->getContext().pImpl;
1754 return pImpl->ExprConstants.getOrCreate(ShufTy, Key);
1757 Constant *ConstantExpr::getInsertValue(Constant *Agg, Constant *Val,
1758 ArrayRef<unsigned> Idxs) {
1759 assert(ExtractValueInst::getIndexedType(Agg->getType(),
1760 Idxs) == Val->getType() &&
1761 "insertvalue indices invalid!");
1762 assert(Agg->getType()->isFirstClassType() &&
1763 "Non-first-class type for constant insertvalue expression");
1764 Constant *FC = ConstantFoldInsertValueInstruction(Agg, Val, Idxs);
1765 assert(FC && "insertvalue constant expr couldn't be folded!");
1769 Constant *ConstantExpr::getExtractValue(Constant *Agg,
1770 ArrayRef<unsigned> Idxs) {
1771 assert(Agg->getType()->isFirstClassType() &&
1772 "Tried to create extractelement operation on non-first-class type!");
1774 Type *ReqTy = ExtractValueInst::getIndexedType(Agg->getType(), Idxs);
1776 assert(ReqTy && "extractvalue indices invalid!");
1778 assert(Agg->getType()->isFirstClassType() &&
1779 "Non-first-class type for constant extractvalue expression");
1780 Constant *FC = ConstantFoldExtractValueInstruction(Agg, Idxs);
1781 assert(FC && "ExtractValue constant expr couldn't be folded!");
1785 Constant *ConstantExpr::getNeg(Constant *C, bool HasNUW, bool HasNSW) {
1786 assert(C->getType()->isIntOrIntVectorTy() &&
1787 "Cannot NEG a nonintegral value!");
1788 return getSub(ConstantFP::getZeroValueForNegation(C->getType()),
1792 Constant *ConstantExpr::getFNeg(Constant *C) {
1793 assert(C->getType()->isFPOrFPVectorTy() &&
1794 "Cannot FNEG a non-floating-point value!");
1795 return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
1798 Constant *ConstantExpr::getNot(Constant *C) {
1799 assert(C->getType()->isIntOrIntVectorTy() &&
1800 "Cannot NOT a nonintegral value!");
1801 return get(Instruction::Xor, C, Constant::getAllOnesValue(C->getType()));
1804 Constant *ConstantExpr::getAdd(Constant *C1, Constant *C2,
1805 bool HasNUW, bool HasNSW) {
1806 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1807 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1808 return get(Instruction::Add, C1, C2, Flags);
1811 Constant *ConstantExpr::getFAdd(Constant *C1, Constant *C2) {
1812 return get(Instruction::FAdd, C1, C2);
1815 Constant *ConstantExpr::getSub(Constant *C1, Constant *C2,
1816 bool HasNUW, bool HasNSW) {
1817 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1818 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1819 return get(Instruction::Sub, C1, C2, Flags);
1822 Constant *ConstantExpr::getFSub(Constant *C1, Constant *C2) {
1823 return get(Instruction::FSub, C1, C2);
1826 Constant *ConstantExpr::getMul(Constant *C1, Constant *C2,
1827 bool HasNUW, bool HasNSW) {
1828 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1829 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1830 return get(Instruction::Mul, C1, C2, Flags);
1833 Constant *ConstantExpr::getFMul(Constant *C1, Constant *C2) {
1834 return get(Instruction::FMul, C1, C2);
1837 Constant *ConstantExpr::getUDiv(Constant *C1, Constant *C2, bool isExact) {
1838 return get(Instruction::UDiv, C1, C2,
1839 isExact ? PossiblyExactOperator::IsExact : 0);
1842 Constant *ConstantExpr::getSDiv(Constant *C1, Constant *C2, bool isExact) {
1843 return get(Instruction::SDiv, C1, C2,
1844 isExact ? PossiblyExactOperator::IsExact : 0);
1847 Constant *ConstantExpr::getFDiv(Constant *C1, Constant *C2) {
1848 return get(Instruction::FDiv, C1, C2);
1851 Constant *ConstantExpr::getURem(Constant *C1, Constant *C2) {
1852 return get(Instruction::URem, C1, C2);
1855 Constant *ConstantExpr::getSRem(Constant *C1, Constant *C2) {
1856 return get(Instruction::SRem, C1, C2);
1859 Constant *ConstantExpr::getFRem(Constant *C1, Constant *C2) {
1860 return get(Instruction::FRem, C1, C2);
1863 Constant *ConstantExpr::getAnd(Constant *C1, Constant *C2) {
1864 return get(Instruction::And, C1, C2);
1867 Constant *ConstantExpr::getOr(Constant *C1, Constant *C2) {
1868 return get(Instruction::Or, C1, C2);
1871 Constant *ConstantExpr::getXor(Constant *C1, Constant *C2) {
1872 return get(Instruction::Xor, C1, C2);
1875 Constant *ConstantExpr::getShl(Constant *C1, Constant *C2,
1876 bool HasNUW, bool HasNSW) {
1877 unsigned Flags = (HasNUW ? OverflowingBinaryOperator::NoUnsignedWrap : 0) |
1878 (HasNSW ? OverflowingBinaryOperator::NoSignedWrap : 0);
1879 return get(Instruction::Shl, C1, C2, Flags);
1882 Constant *ConstantExpr::getLShr(Constant *C1, Constant *C2, bool isExact) {
1883 return get(Instruction::LShr, C1, C2,
1884 isExact ? PossiblyExactOperator::IsExact : 0);
1887 Constant *ConstantExpr::getAShr(Constant *C1, Constant *C2, bool isExact) {
1888 return get(Instruction::AShr, C1, C2,
1889 isExact ? PossiblyExactOperator::IsExact : 0);
1892 // destroyConstant - Remove the constant from the constant table...
1894 void ConstantExpr::destroyConstant() {
1895 getType()->getContext().pImpl->ExprConstants.remove(this);
1896 destroyConstantImpl();
1899 const char *ConstantExpr::getOpcodeName() const {
1900 return Instruction::getOpcodeName(getOpcode());
1905 GetElementPtrConstantExpr::
1906 GetElementPtrConstantExpr(Constant *C, const std::vector<Constant*> &IdxList,
1908 : ConstantExpr(DestTy, Instruction::GetElementPtr,
1909 OperandTraits<GetElementPtrConstantExpr>::op_end(this)
1910 - (IdxList.size()+1), IdxList.size()+1) {
1912 for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
1913 OperandList[i+1] = IdxList[i];
1916 //===----------------------------------------------------------------------===//
1917 // ConstantData* implementations
1919 void ConstantDataArray::anchor() {}
1920 void ConstantDataVector::anchor() {}
1922 /// getElementType - Return the element type of the array/vector.
1923 Type *ConstantDataSequential::getElementType() const {
1924 return getType()->getElementType();
1927 /// isElementTypeConstantDataCompatible - Return true if this type is valid for
1928 /// a ConstantDataSequential. This is i8/i16/i32/i64/float/double.
1929 static bool isElementTypeConstantDataCompatible(const Type *Ty) {
1930 if (Ty->isFloatTy() || Ty->isDoubleTy()) return true;
1931 if (const IntegerType *IT = dyn_cast<IntegerType>(Ty)) {
1932 switch (IT->getBitWidth()) {
1944 /// getElementByteSize - Return the size in bytes of the elements in the data.
1945 uint64_t ConstantDataSequential::getElementByteSize() const {
1946 return getElementType()->getPrimitiveSizeInBits()/8;
1949 /// getElementPointer - Return the start of the specified element.
1950 const char *ConstantDataSequential::getElementPointer(unsigned Elt) const {
1951 assert(Elt < getElementType()->getNumElements() && "Invalid Elt");
1952 return DataElements+Elt*getElementByteSize();
1956 /// isAllZeros - return true if the array is empty or all zeros.
1957 static bool isAllZeros(StringRef Arr) {
1958 for (StringRef::iterator I = Arr.begin(), E = Arr.end(); I != E; ++I)
1963 /// getImpl - This is the underlying implementation of all of the
1964 /// ConstantDataSequential::get methods. They all thunk down to here, providing
1965 /// the correct element type. We take the bytes in as an StringRef because
1966 /// we *want* an underlying "char*" to avoid TBAA type punning violations.
1967 Constant *ConstantDataSequential::getImpl(StringRef Elements, Type *Ty) {
1968 assert(isElementTypeConstantDataCompatible(cast<SequentialType>(Ty)->
1970 // If the elements are all zero, return a CAZ, which is more dense.
1971 if (isAllZeros(Elements))
1972 return ConstantAggregateZero::get(Ty);
1974 // Do a lookup to see if we have already formed one of these.
1975 StringMap<ConstantDataSequential*>::MapEntryTy &Slot =
1976 Ty->getContext().pImpl->CDSConstants.GetOrCreateValue(Elements);
1978 // The bucket can point to a linked list of different CDS's that have the same
1979 // body but different types. For example, 0,0,0,1 could be a 4 element array
1980 // of i8, or a 1-element array of i32. They'll both end up in the same
1981 /// StringMap bucket, linked up by their Next pointers. Walk the list.
1982 ConstantDataSequential **Entry = &Slot.getValue();
1983 for (ConstantDataSequential *Node = *Entry; Node != 0;
1984 Entry = &Node->Next, Node = *Entry)
1985 if (Node->getType() == Ty)
1988 // Okay, we didn't get a hit. Create a node of the right class, link it in,
1990 if (isa<ArrayType>(Ty))
1991 return *Entry = new ConstantDataArray(Ty, Slot.getKeyData());
1993 assert(isa<VectorType>(Ty));
1994 return *Entry = new ConstantDataVector(Ty, Slot.getKeyData());
1997 void ConstantDataSequential::destroyConstant() {
1998 uint64_t ByteSize = getElementByteSize() * getElementType()->getNumElements();
2000 // Remove the constant from the StringMap.
2001 StringMap<ConstantDataSequential*> &CDSConstants =
2002 getType()->getContext().pImpl->CDSConstants;
2004 StringMap<ConstantDataSequential*>::iterator Slot =
2005 CDSConstants.find(StringRef(DataElements, ByteSize));
2007 assert(Slot != CDSConstants.end() && "CDS not found in uniquing table");
2009 ConstantDataSequential **Entry = &Slot->getValue();
2011 // Remove the entry from the hash table.
2012 if ((*Entry)->Next == 0) {
2013 // If there is only one value in the bucket (common case) it must be this
2014 // entry, and removing the entry should remove the bucket completely.
2015 assert((*Entry) == this && "Hash mismatch in ConstantDataSequential");
2016 getContext().pImpl->CDSConstants.erase(Slot);
2018 // Otherwise, there are multiple entries linked off the bucket, unlink the
2019 // node we care about but keep the bucket around.
2020 for (ConstantDataSequential *Node = *Entry; ;
2021 Entry = &Node->Next, Node = *Entry) {
2022 assert(Node && "Didn't find entry in its uniquing hash table!");
2023 // If we found our entry, unlink it from the list and we're done.
2025 *Entry = Node->Next;
2031 // If we were part of a list, make sure that we don't delete the list that is
2032 // still owned by the uniquing map.
2035 // Finally, actually delete it.
2036 destroyConstantImpl();
2039 /// get() constructors - Return a constant with array type with an element
2040 /// count and element type matching the ArrayRef passed in. Note that this
2041 /// can return a ConstantAggregateZero object.
2042 Constant *ConstantDataArray::get(ArrayRef<uint8_t> Elts, LLVMContext &Context) {
2043 Type *Ty = ArrayType::get(Type::getInt8Ty(Context), Elts.size());
2044 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2046 Constant *ConstantDataArray::get(ArrayRef<uint16_t> Elts, LLVMContext &Context){
2047 Type *Ty = ArrayType::get(Type::getInt16Ty(Context), Elts.size());
2048 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2050 Constant *ConstantDataArray::get(ArrayRef<uint32_t> Elts, LLVMContext &Context){
2051 Type *Ty = ArrayType::get(Type::getInt32Ty(Context), Elts.size());
2052 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2054 Constant *ConstantDataArray::get(ArrayRef<uint64_t> Elts, LLVMContext &Context){
2055 Type *Ty = ArrayType::get(Type::getInt64Ty(Context), Elts.size());
2056 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2058 Constant *ConstantDataArray::get(ArrayRef<float> Elts, LLVMContext &Context) {
2059 Type *Ty = ArrayType::get(Type::getFloatTy(Context), Elts.size());
2060 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2062 Constant *ConstantDataArray::get(ArrayRef<double> Elts, LLVMContext &Context) {
2063 Type *Ty = ArrayType::get(Type::getDoubleTy(Context), Elts.size());
2064 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2068 /// get() constructors - Return a constant with vector type with an element
2069 /// count and element type matching the ArrayRef passed in. Note that this
2070 /// can return a ConstantAggregateZero object.
2071 Constant *ConstantDataVector::get(ArrayRef<uint8_t> Elts, LLVMContext &Context) {
2072 Type *Ty = VectorType::get(Type::getInt8Ty(Context), Elts.size());
2073 return getImpl(StringRef((char*)Elts.data(), Elts.size()*1), Ty);
2075 Constant *ConstantDataVector::get(ArrayRef<uint16_t> Elts, LLVMContext &Context){
2076 Type *Ty = VectorType::get(Type::getInt16Ty(Context), Elts.size());
2077 return getImpl(StringRef((char*)Elts.data(), Elts.size()*2), Ty);
2079 Constant *ConstantDataVector::get(ArrayRef<uint32_t> Elts, LLVMContext &Context){
2080 Type *Ty = VectorType::get(Type::getInt32Ty(Context), Elts.size());
2081 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2083 Constant *ConstantDataVector::get(ArrayRef<uint64_t> Elts, LLVMContext &Context){
2084 Type *Ty = VectorType::get(Type::getInt64Ty(Context), Elts.size());
2085 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2087 Constant *ConstantDataVector::get(ArrayRef<float> Elts, LLVMContext &Context) {
2088 Type *Ty = VectorType::get(Type::getFloatTy(Context), Elts.size());
2089 return getImpl(StringRef((char*)Elts.data(), Elts.size()*4), Ty);
2091 Constant *ConstantDataVector::get(ArrayRef<double> Elts, LLVMContext &Context) {
2092 Type *Ty = VectorType::get(Type::getDoubleTy(Context), Elts.size());
2093 return getImpl(StringRef((char*)Elts.data(), Elts.size()*8), Ty);
2096 /// getElementAsInteger - If this is a sequential container of integers (of
2097 /// any size), return the specified element in the low bits of a uint64_t.
2098 uint64_t ConstantDataSequential::getElementAsInteger(unsigned Elt) const {
2099 assert(isa<IntegerType>(getElementType()) &&
2100 "Accessor can only be used when element is an integer");
2101 const char *EltPtr = getElementPointer(Elt);
2103 // The data is stored in host byte order, make sure to cast back to the right
2104 // type to load with the right endianness.
2105 switch (cast<IntegerType>(getElementType())->getBitWidth()) {
2106 default: assert(0 && "Invalid bitwidth for CDS");
2107 case 8: return *(uint8_t*)EltPtr;
2108 case 16: return *(uint16_t*)EltPtr;
2109 case 32: return *(uint32_t*)EltPtr;
2110 case 64: return *(uint64_t*)EltPtr;
2114 /// getElementAsAPFloat - If this is a sequential container of floating point
2115 /// type, return the specified element as an APFloat.
2116 APFloat ConstantDataSequential::getElementAsAPFloat(unsigned Elt) const {
2117 const char *EltPtr = getElementPointer(Elt);
2119 switch (getElementType()->getTypeID()) {
2120 default: assert("Accessor can only be used when element is float/double!");
2121 case Type::FloatTyID: return APFloat(*(float*)EltPtr);
2122 case Type::DoubleTyID: return APFloat(*(double*)EltPtr);
2126 /// getElementAsFloat - If this is an sequential container of floats, return
2127 /// the specified element as a float.
2128 float ConstantDataSequential::getElementAsFloat(unsigned Elt) const {
2129 assert(getElementType()->isFloatTy() &&
2130 "Accessor can only be used when element is a 'float'");
2131 return *(float*)getElementPointer(Elt);
2134 /// getElementAsDouble - If this is an sequential container of doubles, return
2135 /// the specified element as a float.
2136 double ConstantDataSequential::getElementAsDouble(unsigned Elt) const {
2137 assert(getElementType()->isDoubleTy() &&
2138 "Accessor can only be used when element is a 'float'");
2139 return *(double*)getElementPointer(Elt);
2142 /// getElementAsConstant - Return a Constant for a specified index's element.
2143 /// Note that this has to compute a new constant to return, so it isn't as
2144 /// efficient as getElementAsInteger/Float/Double.
2145 Constant *ConstantDataSequential::getElementAsConstant(unsigned Elt) const {
2146 if (getElementType()->isFloatTy() || getElementType()->isDoubleTy())
2147 return ConstantFP::get(getContext(), getElementAsAPFloat(Elt));
2149 return ConstantInt::get(getElementType(), getElementAsInteger(Elt));
2155 //===----------------------------------------------------------------------===//
2156 // replaceUsesOfWithOnConstant implementations
2158 /// replaceUsesOfWithOnConstant - Update this constant array to change uses of
2159 /// 'From' to be uses of 'To'. This must update the uniquing data structures
2162 /// Note that we intentionally replace all uses of From with To here. Consider
2163 /// a large array that uses 'From' 1000 times. By handling this case all here,
2164 /// ConstantArray::replaceUsesOfWithOnConstant is only invoked once, and that
2165 /// single invocation handles all 1000 uses. Handling them one at a time would
2166 /// work, but would be really slow because it would have to unique each updated
2169 void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
2171 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2172 Constant *ToC = cast<Constant>(To);
2174 LLVMContextImpl *pImpl = getType()->getContext().pImpl;
2176 std::pair<LLVMContextImpl::ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
2177 Lookup.first.first = cast<ArrayType>(getType());
2178 Lookup.second = this;
2180 std::vector<Constant*> &Values = Lookup.first.second;
2181 Values.reserve(getNumOperands()); // Build replacement array.
2183 // Fill values with the modified operands of the constant array. Also,
2184 // compute whether this turns into an all-zeros array.
2185 bool isAllZeros = false;
2186 unsigned NumUpdated = 0;
2187 if (!ToC->isNullValue()) {
2188 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2189 Constant *Val = cast<Constant>(O->get());
2194 Values.push_back(Val);
2198 for (Use *O = OperandList, *E = OperandList+getNumOperands();O != E; ++O) {
2199 Constant *Val = cast<Constant>(O->get());
2204 Values.push_back(Val);
2205 if (isAllZeros) isAllZeros = Val->isNullValue();
2209 Constant *Replacement = 0;
2211 Replacement = ConstantAggregateZero::get(getType());
2213 // Check to see if we have this array type already.
2215 LLVMContextImpl::ArrayConstantsTy::MapTy::iterator I =
2216 pImpl->ArrayConstants.InsertOrGetItem(Lookup, Exists);
2219 Replacement = I->second;
2221 // Okay, the new shape doesn't exist in the system yet. Instead of
2222 // creating a new constant array, inserting it, replaceallusesof'ing the
2223 // old with the new, then deleting the old... just update the current one
2225 pImpl->ArrayConstants.MoveConstantToNewSlot(this, I);
2227 // Update to the new value. Optimize for the case when we have a single
2228 // operand that we're changing, but handle bulk updates efficiently.
2229 if (NumUpdated == 1) {
2230 unsigned OperandToUpdate = U - OperandList;
2231 assert(getOperand(OperandToUpdate) == From &&
2232 "ReplaceAllUsesWith broken!");
2233 setOperand(OperandToUpdate, ToC);
2235 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
2236 if (getOperand(i) == From)
2243 // Otherwise, I do need to replace this with an existing value.
2244 assert(Replacement != this && "I didn't contain From!");
2246 // Everyone using this now uses the replacement.
2247 replaceAllUsesWith(Replacement);
2249 // Delete the old constant!
2253 void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
2255 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2256 Constant *ToC = cast<Constant>(To);
2258 unsigned OperandToUpdate = U-OperandList;
2259 assert(getOperand(OperandToUpdate) == From && "ReplaceAllUsesWith broken!");
2261 std::pair<LLVMContextImpl::StructConstantsTy::MapKey, ConstantStruct*> Lookup;
2262 Lookup.first.first = cast<StructType>(getType());
2263 Lookup.second = this;
2264 std::vector<Constant*> &Values = Lookup.first.second;
2265 Values.reserve(getNumOperands()); // Build replacement struct.
2268 // Fill values with the modified operands of the constant struct. Also,
2269 // compute whether this turns into an all-zeros struct.
2270 bool isAllZeros = false;
2271 if (!ToC->isNullValue()) {
2272 for (Use *O = OperandList, *E = OperandList + getNumOperands(); O != E; ++O)
2273 Values.push_back(cast<Constant>(O->get()));
2276 for (Use *O = OperandList, *E = OperandList+getNumOperands(); O != E; ++O) {
2277 Constant *Val = cast<Constant>(O->get());
2278 Values.push_back(Val);
2279 if (isAllZeros) isAllZeros = Val->isNullValue();
2282 Values[OperandToUpdate] = ToC;
2284 LLVMContextImpl *pImpl = getContext().pImpl;
2286 Constant *Replacement = 0;
2288 Replacement = ConstantAggregateZero::get(getType());
2290 // Check to see if we have this struct type already.
2292 LLVMContextImpl::StructConstantsTy::MapTy::iterator I =
2293 pImpl->StructConstants.InsertOrGetItem(Lookup, Exists);
2296 Replacement = I->second;
2298 // Okay, the new shape doesn't exist in the system yet. Instead of
2299 // creating a new constant struct, inserting it, replaceallusesof'ing the
2300 // old with the new, then deleting the old... just update the current one
2302 pImpl->StructConstants.MoveConstantToNewSlot(this, I);
2304 // Update to the new value.
2305 setOperand(OperandToUpdate, ToC);
2310 assert(Replacement != this && "I didn't contain From!");
2312 // Everyone using this now uses the replacement.
2313 replaceAllUsesWith(Replacement);
2315 // Delete the old constant!
2319 void ConstantVector::replaceUsesOfWithOnConstant(Value *From, Value *To,
2321 assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
2323 std::vector<Constant*> Values;
2324 Values.reserve(getNumOperands()); // Build replacement array...
2325 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
2326 Constant *Val = getOperand(i);
2327 if (Val == From) Val = cast<Constant>(To);
2328 Values.push_back(Val);
2331 Constant *Replacement = get(Values);
2332 assert(Replacement != this && "I didn't contain From!");
2334 // Everyone using this now uses the replacement.
2335 replaceAllUsesWith(Replacement);
2337 // Delete the old constant!
2341 void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
2343 assert(isa<Constant>(ToV) && "Cannot make Constant refer to non-constant!");
2344 Constant *To = cast<Constant>(ToV);
2346 Constant *Replacement = 0;
2347 if (getOpcode() == Instruction::GetElementPtr) {
2348 SmallVector<Constant*, 8> Indices;
2349 Constant *Pointer = getOperand(0);
2350 Indices.reserve(getNumOperands()-1);
2351 if (Pointer == From) Pointer = To;
2353 for (unsigned i = 1, e = getNumOperands(); i != e; ++i) {
2354 Constant *Val = getOperand(i);
2355 if (Val == From) Val = To;
2356 Indices.push_back(Val);
2358 Replacement = ConstantExpr::getGetElementPtr(Pointer, Indices,
2359 cast<GEPOperator>(this)->isInBounds());
2360 } else if (getOpcode() == Instruction::ExtractValue) {
2361 Constant *Agg = getOperand(0);
2362 if (Agg == From) Agg = To;
2364 ArrayRef<unsigned> Indices = getIndices();
2365 Replacement = ConstantExpr::getExtractValue(Agg, Indices);
2366 } else if (getOpcode() == Instruction::InsertValue) {
2367 Constant *Agg = getOperand(0);
2368 Constant *Val = getOperand(1);
2369 if (Agg == From) Agg = To;
2370 if (Val == From) Val = To;
2372 ArrayRef<unsigned> Indices = getIndices();
2373 Replacement = ConstantExpr::getInsertValue(Agg, Val, Indices);
2374 } else if (isCast()) {
2375 assert(getOperand(0) == From && "Cast only has one use!");
2376 Replacement = ConstantExpr::getCast(getOpcode(), To, getType());
2377 } else if (getOpcode() == Instruction::Select) {
2378 Constant *C1 = getOperand(0);
2379 Constant *C2 = getOperand(1);
2380 Constant *C3 = getOperand(2);
2381 if (C1 == From) C1 = To;
2382 if (C2 == From) C2 = To;
2383 if (C3 == From) C3 = To;
2384 Replacement = ConstantExpr::getSelect(C1, C2, C3);
2385 } else if (getOpcode() == Instruction::ExtractElement) {
2386 Constant *C1 = getOperand(0);
2387 Constant *C2 = getOperand(1);
2388 if (C1 == From) C1 = To;
2389 if (C2 == From) C2 = To;
2390 Replacement = ConstantExpr::getExtractElement(C1, C2);
2391 } else if (getOpcode() == Instruction::InsertElement) {
2392 Constant *C1 = getOperand(0);
2393 Constant *C2 = getOperand(1);
2394 Constant *C3 = getOperand(1);
2395 if (C1 == From) C1 = To;
2396 if (C2 == From) C2 = To;
2397 if (C3 == From) C3 = To;
2398 Replacement = ConstantExpr::getInsertElement(C1, C2, C3);
2399 } else if (getOpcode() == Instruction::ShuffleVector) {
2400 Constant *C1 = getOperand(0);
2401 Constant *C2 = getOperand(1);
2402 Constant *C3 = getOperand(2);
2403 if (C1 == From) C1 = To;
2404 if (C2 == From) C2 = To;
2405 if (C3 == From) C3 = To;
2406 Replacement = ConstantExpr::getShuffleVector(C1, C2, C3);
2407 } else if (isCompare()) {
2408 Constant *C1 = getOperand(0);
2409 Constant *C2 = getOperand(1);
2410 if (C1 == From) C1 = To;
2411 if (C2 == From) C2 = To;
2412 if (getOpcode() == Instruction::ICmp)
2413 Replacement = ConstantExpr::getICmp(getPredicate(), C1, C2);
2415 assert(getOpcode() == Instruction::FCmp);
2416 Replacement = ConstantExpr::getFCmp(getPredicate(), C1, C2);
2418 } else if (getNumOperands() == 2) {
2419 Constant *C1 = getOperand(0);
2420 Constant *C2 = getOperand(1);
2421 if (C1 == From) C1 = To;
2422 if (C2 == From) C2 = To;
2423 Replacement = ConstantExpr::get(getOpcode(), C1, C2, SubclassOptionalData);
2425 llvm_unreachable("Unknown ConstantExpr type!");
2428 assert(Replacement != this && "I didn't contain From!");
2430 // Everyone using this now uses the replacement.
2431 replaceAllUsesWith(Replacement);
2433 // Delete the old constant!