#include "llvm/Function.h"
#include "llvm/GlobalAlias.h"
#include "llvm/GlobalVariable.h"
-#include "llvm/LLVMContext.h"
+#include "llvm/Operator.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
/// BitCastConstantVector - Convert the specified ConstantVector node to the
/// specified vector type. At this point, we know that the elements of the
/// input vector constant are all simple integer or FP values.
-static Constant *BitCastConstantVector(LLVMContext &Context, ConstantVector *CV,
+static Constant *BitCastConstantVector(ConstantVector *CV,
const VectorType *DstTy) {
+
+ if (CV->isAllOnesValue()) return Constant::getAllOnesValue(DstTy);
+ if (CV->isNullValue()) return Constant::getNullValue(DstTy);
+
// If this cast changes element count then we can't handle it here:
// doing so requires endianness information. This should be handled by
// Analysis/ConstantFolding.cpp
Type::getInt64Ty(DstTy->getContext()));
}
-static Constant *FoldBitCast(LLVMContext &Context,
- Constant *V, const Type *DestTy) {
+static Constant *FoldBitCast(Constant *V, const Type *DestTy) {
const Type *SrcTy = V->getType();
if (SrcTy == DestTy)
return V; // no-op cast
if (const PointerType *DPTy = dyn_cast<PointerType>(DestTy))
if (PTy->getAddressSpace() == DPTy->getAddressSpace()) {
SmallVector<Value*, 8> IdxList;
- Value *Zero = Constant::getNullValue(Type::getInt32Ty(Context));
+ Value *Zero =
+ Constant::getNullValue(Type::getInt32Ty(DPTy->getContext()));
IdxList.push_back(Zero);
const Type *ElTy = PTy->getElementType();
while (ElTy != DPTy->getElementType()) {
IdxList.push_back(Zero);
} else if (const SequentialType *STy =
dyn_cast<SequentialType>(ElTy)) {
- if (isa<PointerType>(ElTy)) break; // Can't index into pointers!
+ if (ElTy->isPointerTy()) break; // Can't index into pointers!
ElTy = STy->getElementType();
IdxList.push_back(Zero);
} else {
return Constant::getNullValue(DestTy);
if (ConstantVector *CV = dyn_cast<ConstantVector>(V))
- return BitCastConstantVector(Context, CV, DestPTy);
+ return BitCastConstantVector(CV, DestPTy);
}
// Canonicalize scalar-to-vector bitcasts into vector-to-vector bitcasts
// This allows for other simplifications (although some of them
// can only be handled by Analysis/ConstantFolding.cpp).
if (isa<ConstantInt>(V) || isa<ConstantFP>(V))
- return ConstantExpr::getBitCast(
- ConstantVector::get(&V, 1), DestPTy);
+ return ConstantExpr::getBitCast(ConstantVector::get(V), DestPTy);
}
// Finally, implement bitcast folding now. The code below doesn't handle
// Handle integral constant input.
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
- if (DestTy->isInteger())
+ if (DestTy->isIntegerTy())
// Integral -> Integral. This is a no-op because the bit widths must
// be the same. Consequently, we just fold to V.
return V;
- if (DestTy->isFloatingPoint())
- return ConstantFP::get(Context, APFloat(CI->getValue(),
- DestTy != Type::getPPC_FP128Ty(Context)));
+ if (DestTy->isFloatingPointTy())
+ return ConstantFP::get(DestTy->getContext(),
+ APFloat(CI->getValue(),
+ !DestTy->isPPC_FP128Ty()));
// Otherwise, can't fold this (vector?)
return 0;
}
- // Handle ConstantFP input.
+ // Handle ConstantFP input: FP -> Integral.
if (ConstantFP *FP = dyn_cast<ConstantFP>(V))
- // FP -> Integral.
- return ConstantInt::get(Context, FP->getValueAPF().bitcastToAPInt());
+ return ConstantInt::get(FP->getContext(),
+ FP->getValueAPF().bitcastToAPInt());
return 0;
}
-Constant *llvm::ConstantFoldCastInstruction(LLVMContext &Context,
- unsigned opc, Constant *V,
+/// ExtractConstantBytes - V is an integer constant which only has a subset of
+/// its bytes used. The bytes used are indicated by ByteStart (which is the
+/// first byte used, counting from the least significant byte) and ByteSize,
+/// which is the number of bytes used.
+///
+/// This function analyzes the specified constant to see if the specified byte
+/// range can be returned as a simplified constant. If so, the constant is
+/// returned, otherwise null is returned.
+///
+static Constant *ExtractConstantBytes(Constant *C, unsigned ByteStart,
+ unsigned ByteSize) {
+ assert(C->getType()->isIntegerTy() &&
+ (cast<IntegerType>(C->getType())->getBitWidth() & 7) == 0 &&
+ "Non-byte sized integer input");
+ unsigned CSize = cast<IntegerType>(C->getType())->getBitWidth()/8;
+ assert(ByteSize && "Must be accessing some piece");
+ assert(ByteStart+ByteSize <= CSize && "Extracting invalid piece from input");
+ assert(ByteSize != CSize && "Should not extract everything");
+
+ // Constant Integers are simple.
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
+ APInt V = CI->getValue();
+ if (ByteStart)
+ V = V.lshr(ByteStart*8);
+ V = V.trunc(ByteSize*8);
+ return ConstantInt::get(CI->getContext(), V);
+ }
+
+ // In the input is a constant expr, we might be able to recursively simplify.
+ // If not, we definitely can't do anything.
+ ConstantExpr *CE = dyn_cast<ConstantExpr>(C);
+ if (CE == 0) return 0;
+
+ switch (CE->getOpcode()) {
+ default: return 0;
+ case Instruction::Or: {
+ Constant *RHS = ExtractConstantBytes(CE->getOperand(1), ByteStart,ByteSize);
+ if (RHS == 0)
+ return 0;
+
+ // X | -1 -> -1.
+ if (ConstantInt *RHSC = dyn_cast<ConstantInt>(RHS))
+ if (RHSC->isAllOnesValue())
+ return RHSC;
+
+ Constant *LHS = ExtractConstantBytes(CE->getOperand(0), ByteStart,ByteSize);
+ if (LHS == 0)
+ return 0;
+ return ConstantExpr::getOr(LHS, RHS);
+ }
+ case Instruction::And: {
+ Constant *RHS = ExtractConstantBytes(CE->getOperand(1), ByteStart,ByteSize);
+ if (RHS == 0)
+ return 0;
+
+ // X & 0 -> 0.
+ if (RHS->isNullValue())
+ return RHS;
+
+ Constant *LHS = ExtractConstantBytes(CE->getOperand(0), ByteStart,ByteSize);
+ if (LHS == 0)
+ return 0;
+ return ConstantExpr::getAnd(LHS, RHS);
+ }
+ case Instruction::LShr: {
+ ConstantInt *Amt = dyn_cast<ConstantInt>(CE->getOperand(1));
+ if (Amt == 0)
+ return 0;
+ unsigned ShAmt = Amt->getZExtValue();
+ // Cannot analyze non-byte shifts.
+ if ((ShAmt & 7) != 0)
+ return 0;
+ ShAmt >>= 3;
+
+ // If the extract is known to be all zeros, return zero.
+ if (ByteStart >= CSize-ShAmt)
+ return Constant::getNullValue(IntegerType::get(CE->getContext(),
+ ByteSize*8));
+ // If the extract is known to be fully in the input, extract it.
+ if (ByteStart+ByteSize+ShAmt <= CSize)
+ return ExtractConstantBytes(CE->getOperand(0), ByteStart+ShAmt, ByteSize);
+
+ // TODO: Handle the 'partially zero' case.
+ return 0;
+ }
+
+ case Instruction::Shl: {
+ ConstantInt *Amt = dyn_cast<ConstantInt>(CE->getOperand(1));
+ if (Amt == 0)
+ return 0;
+ unsigned ShAmt = Amt->getZExtValue();
+ // Cannot analyze non-byte shifts.
+ if ((ShAmt & 7) != 0)
+ return 0;
+ ShAmt >>= 3;
+
+ // If the extract is known to be all zeros, return zero.
+ if (ByteStart+ByteSize <= ShAmt)
+ return Constant::getNullValue(IntegerType::get(CE->getContext(),
+ ByteSize*8));
+ // If the extract is known to be fully in the input, extract it.
+ if (ByteStart >= ShAmt)
+ return ExtractConstantBytes(CE->getOperand(0), ByteStart-ShAmt, ByteSize);
+
+ // TODO: Handle the 'partially zero' case.
+ return 0;
+ }
+
+ case Instruction::ZExt: {
+ unsigned SrcBitSize =
+ cast<IntegerType>(CE->getOperand(0)->getType())->getBitWidth();
+
+ // If extracting something that is completely zero, return 0.
+ if (ByteStart*8 >= SrcBitSize)
+ return Constant::getNullValue(IntegerType::get(CE->getContext(),
+ ByteSize*8));
+
+ // If exactly extracting the input, return it.
+ if (ByteStart == 0 && ByteSize*8 == SrcBitSize)
+ return CE->getOperand(0);
+
+ // If extracting something completely in the input, if if the input is a
+ // multiple of 8 bits, recurse.
+ if ((SrcBitSize&7) == 0 && (ByteStart+ByteSize)*8 <= SrcBitSize)
+ return ExtractConstantBytes(CE->getOperand(0), ByteStart, ByteSize);
+
+ // Otherwise, if extracting a subset of the input, which is not multiple of
+ // 8 bits, do a shift and trunc to get the bits.
+ if ((ByteStart+ByteSize)*8 < SrcBitSize) {
+ assert((SrcBitSize&7) && "Shouldn't get byte sized case here");
+ Constant *Res = CE->getOperand(0);
+ if (ByteStart)
+ Res = ConstantExpr::getLShr(Res,
+ ConstantInt::get(Res->getType(), ByteStart*8));
+ return ConstantExpr::getTrunc(Res, IntegerType::get(C->getContext(),
+ ByteSize*8));
+ }
+
+ // TODO: Handle the 'partially zero' case.
+ return 0;
+ }
+ }
+}
+
+/// getFoldedSizeOf - Return a ConstantExpr with type DestTy for sizeof
+/// on Ty, with any known factors factored out. If Folded is false,
+/// return null if no factoring was possible, to avoid endlessly
+/// bouncing an unfoldable expression back into the top-level folder.
+///
+static Constant *getFoldedSizeOf(const Type *Ty, const Type *DestTy,
+ bool Folded) {
+ if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
+ Constant *N = ConstantInt::get(DestTy, ATy->getNumElements());
+ Constant *E = getFoldedSizeOf(ATy->getElementType(), DestTy, true);
+ return ConstantExpr::getNUWMul(E, N);
+ }
+
+ if (const StructType *STy = dyn_cast<StructType>(Ty))
+ if (!STy->isPacked()) {
+ unsigned NumElems = STy->getNumElements();
+ // An empty struct has size zero.
+ if (NumElems == 0)
+ return ConstantExpr::getNullValue(DestTy);
+ // Check for a struct with all members having the same size.
+ Constant *MemberSize =
+ getFoldedSizeOf(STy->getElementType(0), DestTy, true);
+ bool AllSame = true;
+ for (unsigned i = 1; i != NumElems; ++i)
+ if (MemberSize !=
+ getFoldedSizeOf(STy->getElementType(i), DestTy, true)) {
+ AllSame = false;
+ break;
+ }
+ if (AllSame) {
+ Constant *N = ConstantInt::get(DestTy, NumElems);
+ return ConstantExpr::getNUWMul(MemberSize, N);
+ }
+ }
+
+ // Pointer size doesn't depend on the pointee type, so canonicalize them
+ // to an arbitrary pointee.
+ if (const PointerType *PTy = dyn_cast<PointerType>(Ty))
+ if (!PTy->getElementType()->isIntegerTy(1))
+ return
+ getFoldedSizeOf(PointerType::get(IntegerType::get(PTy->getContext(), 1),
+ PTy->getAddressSpace()),
+ DestTy, true);
+
+ // If there's no interesting folding happening, bail so that we don't create
+ // a constant that looks like it needs folding but really doesn't.
+ if (!Folded)
+ return 0;
+
+ // Base case: Get a regular sizeof expression.
+ Constant *C = ConstantExpr::getSizeOf(Ty);
+ C = ConstantExpr::getCast(CastInst::getCastOpcode(C, false,
+ DestTy, false),
+ C, DestTy);
+ return C;
+}
+
+/// getFoldedAlignOf - Return a ConstantExpr with type DestTy for alignof
+/// on Ty, with any known factors factored out. If Folded is false,
+/// return null if no factoring was possible, to avoid endlessly
+/// bouncing an unfoldable expression back into the top-level folder.
+///
+static Constant *getFoldedAlignOf(const Type *Ty, const Type *DestTy,
+ bool Folded) {
+ // The alignment of an array is equal to the alignment of the
+ // array element. Note that this is not always true for vectors.
+ if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
+ Constant *C = ConstantExpr::getAlignOf(ATy->getElementType());
+ C = ConstantExpr::getCast(CastInst::getCastOpcode(C, false,
+ DestTy,
+ false),
+ C, DestTy);
+ return C;
+ }
+
+ if (const StructType *STy = dyn_cast<StructType>(Ty)) {
+ // Packed structs always have an alignment of 1.
+ if (STy->isPacked())
+ return ConstantInt::get(DestTy, 1);
+
+ // Otherwise, struct alignment is the maximum alignment of any member.
+ // Without target data, we can't compare much, but we can check to see
+ // if all the members have the same alignment.
+ unsigned NumElems = STy->getNumElements();
+ // An empty struct has minimal alignment.
+ if (NumElems == 0)
+ return ConstantInt::get(DestTy, 1);
+ // Check for a struct with all members having the same alignment.
+ Constant *MemberAlign =
+ getFoldedAlignOf(STy->getElementType(0), DestTy, true);
+ bool AllSame = true;
+ for (unsigned i = 1; i != NumElems; ++i)
+ if (MemberAlign != getFoldedAlignOf(STy->getElementType(i), DestTy, true)) {
+ AllSame = false;
+ break;
+ }
+ if (AllSame)
+ return MemberAlign;
+ }
+
+ // Pointer alignment doesn't depend on the pointee type, so canonicalize them
+ // to an arbitrary pointee.
+ if (const PointerType *PTy = dyn_cast<PointerType>(Ty))
+ if (!PTy->getElementType()->isIntegerTy(1))
+ return
+ getFoldedAlignOf(PointerType::get(IntegerType::get(PTy->getContext(),
+ 1),
+ PTy->getAddressSpace()),
+ DestTy, true);
+
+ // If there's no interesting folding happening, bail so that we don't create
+ // a constant that looks like it needs folding but really doesn't.
+ if (!Folded)
+ return 0;
+
+ // Base case: Get a regular alignof expression.
+ Constant *C = ConstantExpr::getAlignOf(Ty);
+ C = ConstantExpr::getCast(CastInst::getCastOpcode(C, false,
+ DestTy, false),
+ C, DestTy);
+ return C;
+}
+
+/// getFoldedOffsetOf - Return a ConstantExpr with type DestTy for offsetof
+/// on Ty and FieldNo, with any known factors factored out. If Folded is false,
+/// return null if no factoring was possible, to avoid endlessly
+/// bouncing an unfoldable expression back into the top-level folder.
+///
+static Constant *getFoldedOffsetOf(const Type *Ty, Constant *FieldNo,
+ const Type *DestTy,
+ bool Folded) {
+ if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
+ Constant *N = ConstantExpr::getCast(CastInst::getCastOpcode(FieldNo, false,
+ DestTy, false),
+ FieldNo, DestTy);
+ Constant *E = getFoldedSizeOf(ATy->getElementType(), DestTy, true);
+ return ConstantExpr::getNUWMul(E, N);
+ }
+
+ if (const StructType *STy = dyn_cast<StructType>(Ty))
+ if (!STy->isPacked()) {
+ unsigned NumElems = STy->getNumElements();
+ // An empty struct has no members.
+ if (NumElems == 0)
+ return 0;
+ // Check for a struct with all members having the same size.
+ Constant *MemberSize =
+ getFoldedSizeOf(STy->getElementType(0), DestTy, true);
+ bool AllSame = true;
+ for (unsigned i = 1; i != NumElems; ++i)
+ if (MemberSize !=
+ getFoldedSizeOf(STy->getElementType(i), DestTy, true)) {
+ AllSame = false;
+ break;
+ }
+ if (AllSame) {
+ Constant *N = ConstantExpr::getCast(CastInst::getCastOpcode(FieldNo,
+ false,
+ DestTy,
+ false),
+ FieldNo, DestTy);
+ return ConstantExpr::getNUWMul(MemberSize, N);
+ }
+ }
+
+ // If there's no interesting folding happening, bail so that we don't create
+ // a constant that looks like it needs folding but really doesn't.
+ if (!Folded)
+ return 0;
+
+ // Base case: Get a regular offsetof expression.
+ Constant *C = ConstantExpr::getOffsetOf(Ty, FieldNo);
+ C = ConstantExpr::getCast(CastInst::getCastOpcode(C, false,
+ DestTy, false),
+ C, DestTy);
+ return C;
+}
+
+Constant *llvm::ConstantFoldCastInstruction(unsigned opc, Constant *V,
const Type *DestTy) {
if (isa<UndefValue>(V)) {
// zext(undef) = 0, because the top bits will be zero.
return Constant::getNullValue(DestTy);
return UndefValue::get(DestTy);
}
+
// No compile-time operations on this type yet.
if (V->getType()->isPPC_FP128Ty() || DestTy->isPPC_FP128Ty())
return 0;
+ if (V->isNullValue() && !DestTy->isX86_MMXTy())
+ return Constant::getNullValue(DestTy);
+
// If the cast operand is a constant expression, there's a few things we can
// do to try to simplify it.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
// operating on each element. In the cast of bitcasts, the element
// count may be mismatched; don't attempt to handle that here.
if (ConstantVector *CV = dyn_cast<ConstantVector>(V))
- if (isa<VectorType>(DestTy) &&
+ if (DestTy->isVectorTy() &&
cast<VectorType>(DestTy)->getNumElements() ==
CV->getType()->getNumElements()) {
std::vector<Constant*> res;
// We actually have to do a cast now. Perform the cast according to the
// opcode specified.
switch (opc) {
+ default:
+ llvm_unreachable("Failed to cast constant expression");
case Instruction::FPTrunc:
case Instruction::FPExt:
if (ConstantFP *FPC = dyn_cast<ConstantFP>(V)) {
DestTy->isFP128Ty() ? APFloat::IEEEquad :
APFloat::Bogus,
APFloat::rmNearestTiesToEven, &ignored);
- return ConstantFP::get(Context, Val);
+ return ConstantFP::get(V->getContext(), Val);
}
return 0; // Can't fold.
case Instruction::FPToUI:
(void) V.convertToInteger(x, DestBitWidth, opc==Instruction::FPToSI,
APFloat::rmTowardZero, &ignored);
APInt Val(DestBitWidth, 2, x);
- return ConstantInt::get(Context, Val);
+ return ConstantInt::get(FPC->getContext(), Val);
}
return 0; // Can't fold.
case Instruction::IntToPtr: //always treated as unsigned
return ConstantPointerNull::get(cast<PointerType>(DestTy));
return 0; // Other pointer types cannot be casted
case Instruction::PtrToInt: // always treated as unsigned
- if (V->isNullValue()) // is it a null pointer value?
+ // Is it a null pointer value?
+ if (V->isNullValue())
return ConstantInt::get(DestTy, 0);
- return 0; // Other pointer types cannot be casted
+ // If this is a sizeof-like expression, pull out multiplications by
+ // known factors to expose them to subsequent folding. If it's an
+ // alignof-like expression, factor out known factors.
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
+ if (CE->getOpcode() == Instruction::GetElementPtr &&
+ CE->getOperand(0)->isNullValue()) {
+ const Type *Ty =
+ cast<PointerType>(CE->getOperand(0)->getType())->getElementType();
+ if (CE->getNumOperands() == 2) {
+ // Handle a sizeof-like expression.
+ Constant *Idx = CE->getOperand(1);
+ bool isOne = isa<ConstantInt>(Idx) && cast<ConstantInt>(Idx)->isOne();
+ if (Constant *C = getFoldedSizeOf(Ty, DestTy, !isOne)) {
+ Idx = ConstantExpr::getCast(CastInst::getCastOpcode(Idx, true,
+ DestTy, false),
+ Idx, DestTy);
+ return ConstantExpr::getMul(C, Idx);
+ }
+ } else if (CE->getNumOperands() == 3 &&
+ CE->getOperand(1)->isNullValue()) {
+ // Handle an alignof-like expression.
+ if (const StructType *STy = dyn_cast<StructType>(Ty))
+ if (!STy->isPacked()) {
+ ConstantInt *CI = cast<ConstantInt>(CE->getOperand(2));
+ if (CI->isOne() &&
+ STy->getNumElements() == 2 &&
+ STy->getElementType(0)->isIntegerTy(1)) {
+ return getFoldedAlignOf(STy->getElementType(1), DestTy, false);
+ }
+ }
+ // Handle an offsetof-like expression.
+ if (Ty->isStructTy() || Ty->isArrayTy()) {
+ if (Constant *C = getFoldedOffsetOf(Ty, CE->getOperand(2),
+ DestTy, false))
+ return C;
+ }
+ }
+ }
+ // Other pointer types cannot be casted
+ return 0;
case Instruction::UIToFP:
case Instruction::SIToFP:
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
APInt api = CI->getValue();
- const uint64_t zero[] = {0, 0};
- APFloat apf = APFloat(APInt(DestTy->getPrimitiveSizeInBits(),
- 2, zero));
+ APFloat apf(APInt::getNullValue(DestTy->getPrimitiveSizeInBits()), true);
(void)apf.convertFromAPInt(api,
opc==Instruction::SIToFP,
APFloat::rmNearestTiesToEven);
- return ConstantFP::get(Context, apf);
+ return ConstantFP::get(V->getContext(), apf);
}
return 0;
case Instruction::ZExt:
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
uint32_t BitWidth = cast<IntegerType>(DestTy)->getBitWidth();
- APInt Result(CI->getValue());
- Result.zext(BitWidth);
- return ConstantInt::get(Context, Result);
+ return ConstantInt::get(V->getContext(),
+ CI->getValue().zext(BitWidth));
}
return 0;
case Instruction::SExt:
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
uint32_t BitWidth = cast<IntegerType>(DestTy)->getBitWidth();
- APInt Result(CI->getValue());
- Result.sext(BitWidth);
- return ConstantInt::get(Context, Result);
+ return ConstantInt::get(V->getContext(),
+ CI->getValue().sext(BitWidth));
}
return 0;
- case Instruction::Trunc:
+ case Instruction::Trunc: {
+ uint32_t DestBitWidth = cast<IntegerType>(DestTy)->getBitWidth();
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
- uint32_t BitWidth = cast<IntegerType>(DestTy)->getBitWidth();
- APInt Result(CI->getValue());
- Result.trunc(BitWidth);
- return ConstantInt::get(Context, Result);
+ return ConstantInt::get(V->getContext(),
+ CI->getValue().trunc(DestBitWidth));
}
+
+ // The input must be a constantexpr. See if we can simplify this based on
+ // the bytes we are demanding. Only do this if the source and dest are an
+ // even multiple of a byte.
+ if ((DestBitWidth & 7) == 0 &&
+ (cast<IntegerType>(V->getType())->getBitWidth() & 7) == 0)
+ if (Constant *Res = ExtractConstantBytes(V, 0, DestBitWidth / 8))
+ return Res;
+
return 0;
+ }
case Instruction::BitCast:
- return FoldBitCast(Context, V, DestTy);
- default:
- assert(!"Invalid CE CastInst opcode");
- break;
+ return FoldBitCast(V, DestTy);
}
-
- llvm_unreachable("Failed to cast constant expression");
- return 0;
}
-Constant *llvm::ConstantFoldSelectInstruction(LLVMContext&,
- Constant *Cond,
+Constant *llvm::ConstantFoldSelectInstruction(Constant *Cond,
Constant *V1, Constant *V2) {
if (ConstantInt *CB = dyn_cast<ConstantInt>(Cond))
return CB->getZExtValue() ? V1 : V2;
+ // Check for zero aggregate and ConstantVector of zeros
+ if (Cond->isNullValue()) return V2;
+
+ if (ConstantVector* CondV = dyn_cast<ConstantVector>(Cond)) {
+
+ if (CondV->isAllOnesValue()) return V1;
+
+ const VectorType *VTy = cast<VectorType>(V1->getType());
+ ConstantVector *CP1 = dyn_cast<ConstantVector>(V1);
+ ConstantVector *CP2 = dyn_cast<ConstantVector>(V2);
+
+ if ((CP1 || isa<ConstantAggregateZero>(V1)) &&
+ (CP2 || isa<ConstantAggregateZero>(V2))) {
+
+ // Find the element type of the returned vector
+ const Type *EltTy = VTy->getElementType();
+ unsigned NumElem = VTy->getNumElements();
+ std::vector<Constant*> Res(NumElem);
+
+ bool Valid = true;
+ for (unsigned i = 0; i < NumElem; ++i) {
+ ConstantInt* c = dyn_cast<ConstantInt>(CondV->getOperand(i));
+ if (!c) {
+ Valid = false;
+ break;
+ }
+ Constant *C1 = CP1 ? CP1->getOperand(i) : Constant::getNullValue(EltTy);
+ Constant *C2 = CP2 ? CP2->getOperand(i) : Constant::getNullValue(EltTy);
+ Res[i] = c->getZExtValue() ? C1 : C2;
+ }
+ // If we were able to build the vector, return it
+ if (Valid) return ConstantVector::get(Res);
+ }
+ }
+
+
if (isa<UndefValue>(V1)) return V2;
if (isa<UndefValue>(V2)) return V1;
if (isa<UndefValue>(Cond)) return V1;
if (V1 == V2) return V1;
+
+ if (ConstantExpr *TrueVal = dyn_cast<ConstantExpr>(V1)) {
+ if (TrueVal->getOpcode() == Instruction::Select)
+ if (TrueVal->getOperand(0) == Cond)
+ return ConstantExpr::getSelect(Cond, TrueVal->getOperand(1), V2);
+ }
+ if (ConstantExpr *FalseVal = dyn_cast<ConstantExpr>(V2)) {
+ if (FalseVal->getOpcode() == Instruction::Select)
+ if (FalseVal->getOperand(0) == Cond)
+ return ConstantExpr::getSelect(Cond, V1, FalseVal->getOperand(2));
+ }
+
return 0;
}
-Constant *llvm::ConstantFoldExtractElementInstruction(LLVMContext &Context,
- Constant *Val,
+Constant *llvm::ConstantFoldExtractElementInstruction(Constant *Val,
Constant *Idx) {
if (isa<UndefValue>(Val)) // ee(undef, x) -> undef
return UndefValue::get(cast<VectorType>(Val->getType())->getElementType());
return 0;
}
-Constant *llvm::ConstantFoldInsertElementInstruction(LLVMContext &Context,
- Constant *Val,
+Constant *llvm::ConstantFoldInsertElementInstruction(Constant *Val,
Constant *Elt,
Constant *Idx) {
ConstantInt *CIdx = dyn_cast<ConstantInt>(Idx);
/// GetVectorElement - If C is a ConstantVector, ConstantAggregateZero or Undef
/// return the specified element value. Otherwise return null.
-static Constant *GetVectorElement(LLVMContext &Context, Constant *C,
- unsigned EltNo) {
+static Constant *GetVectorElement(Constant *C, unsigned EltNo) {
if (ConstantVector *CV = dyn_cast<ConstantVector>(C))
return CV->getOperand(EltNo);
return 0;
}
-Constant *llvm::ConstantFoldShuffleVectorInstruction(LLVMContext &Context,
- Constant *V1,
+Constant *llvm::ConstantFoldShuffleVectorInstruction(Constant *V1,
Constant *V2,
Constant *Mask) {
// Undefined shuffle mask -> undefined value.
// Loop over the shuffle mask, evaluating each element.
SmallVector<Constant*, 32> Result;
for (unsigned i = 0; i != MaskNumElts; ++i) {
- Constant *InElt = GetVectorElement(Context, Mask, i);
+ Constant *InElt = GetVectorElement(Mask, i);
if (InElt == 0) return 0;
if (isa<UndefValue>(InElt))
if (Elt >= SrcNumElts*2)
InElt = UndefValue::get(EltTy);
else if (Elt >= SrcNumElts)
- InElt = GetVectorElement(Context, V2, Elt - SrcNumElts);
+ InElt = GetVectorElement(V2, Elt - SrcNumElts);
else
- InElt = GetVectorElement(Context, V1, Elt);
+ InElt = GetVectorElement(V1, Elt);
if (InElt == 0) return 0;
} else {
// Unknown value.
Result.push_back(InElt);
}
- return ConstantVector::get(&Result[0], Result.size());
+ return ConstantVector::get(Result);
}
-Constant *llvm::ConstantFoldExtractValueInstruction(LLVMContext &Context,
- Constant *Agg,
+Constant *llvm::ConstantFoldExtractValueInstruction(Constant *Agg,
const unsigned *Idxs,
unsigned NumIdx) {
// Base case: no indices, so return the entire value.
Idxs + NumIdx));
// Otherwise recurse.
- return ConstantFoldExtractValueInstruction(Context, Agg->getOperand(*Idxs),
+ if (ConstantStruct *CS = dyn_cast<ConstantStruct>(Agg))
+ return ConstantFoldExtractValueInstruction(CS->getOperand(*Idxs),
+ Idxs+1, NumIdx-1);
+
+ if (ConstantArray *CA = dyn_cast<ConstantArray>(Agg))
+ return ConstantFoldExtractValueInstruction(CA->getOperand(*Idxs),
+ Idxs+1, NumIdx-1);
+ ConstantVector *CV = cast<ConstantVector>(Agg);
+ return ConstantFoldExtractValueInstruction(CV->getOperand(*Idxs),
Idxs+1, NumIdx-1);
}
-Constant *llvm::ConstantFoldInsertValueInstruction(LLVMContext &Context,
- Constant *Agg,
+Constant *llvm::ConstantFoldInsertValueInstruction(Constant *Agg,
Constant *Val,
const unsigned *Idxs,
unsigned NumIdx) {
const Type *MemberTy = AggTy->getTypeAtIndex(i);
Constant *Op =
(*Idxs == i) ?
- ConstantFoldInsertValueInstruction(Context, UndefValue::get(MemberTy),
+ ConstantFoldInsertValueInstruction(UndefValue::get(MemberTy),
Val, Idxs+1, NumIdx-1) :
UndefValue::get(MemberTy);
Ops[i] = Op;
}
if (const StructType* ST = dyn_cast<StructType>(AggTy))
- return ConstantStruct::get(Context, Ops, ST->isPacked());
+ return ConstantStruct::get(ST->getContext(), Ops, ST->isPacked());
return ConstantArray::get(cast<ArrayType>(AggTy), Ops);
}
const Type *MemberTy = AggTy->getTypeAtIndex(i);
Constant *Op =
(*Idxs == i) ?
- ConstantFoldInsertValueInstruction(Context,
- Constant::getNullValue(MemberTy),
+ ConstantFoldInsertValueInstruction(Constant::getNullValue(MemberTy),
Val, Idxs+1, NumIdx-1) :
Constant::getNullValue(MemberTy);
Ops[i] = Op;
}
- if (const StructType* ST = dyn_cast<StructType>(AggTy))
- return ConstantStruct::get(Context, Ops, ST->isPacked());
+ if (const StructType *ST = dyn_cast<StructType>(AggTy))
+ return ConstantStruct::get(ST->getContext(), Ops, ST->isPacked());
return ConstantArray::get(cast<ArrayType>(AggTy), Ops);
}
// Insertion of constant into aggregate constant.
std::vector<Constant*> Ops(Agg->getNumOperands());
for (unsigned i = 0; i < Agg->getNumOperands(); ++i) {
- Constant *Op =
- (*Idxs == i) ?
- ConstantFoldInsertValueInstruction(Context, Agg->getOperand(i),
- Val, Idxs+1, NumIdx-1) :
- Agg->getOperand(i);
+ Constant *Op = cast<Constant>(Agg->getOperand(i));
+ if (*Idxs == i)
+ Op = ConstantFoldInsertValueInstruction(Op, Val, Idxs+1, NumIdx-1);
Ops[i] = Op;
}
if (const StructType* ST = dyn_cast<StructType>(Agg->getType()))
- return ConstantStruct::get(Context, Ops, ST->isPacked());
+ return ConstantStruct::get(ST->getContext(), Ops, ST->isPacked());
return ConstantArray::get(cast<ArrayType>(Agg->getType()), Ops);
}
}
-Constant *llvm::ConstantFoldBinaryInstruction(LLVMContext &Context,
- unsigned Opcode,
+Constant *llvm::ConstantFoldBinaryInstruction(unsigned Opcode,
Constant *C1, Constant *C2) {
// No compile-time operations on this type yet.
if (C1->getType()->isPPC_FP128Ty())
return Constant::getNullValue(C1->getType()); // X lshr undef -> 0
// undef lshr X -> 0
case Instruction::AShr:
- if (!isa<UndefValue>(C2))
- return C1; // undef ashr X --> undef
+ if (!isa<UndefValue>(C2)) // undef ashr X --> all ones
+ return Constant::getAllOnesValue(C1->getType());
else if (isa<UndefValue>(C1))
return C1; // undef ashr undef -> undef
else
return ConstantExpr::getLShr(C1, C2);
break;
}
+ } else if (isa<ConstantInt>(C1)) {
+ // If C1 is a ConstantInt and C2 is not, swap the operands.
+ if (Instruction::isCommutative(Opcode))
+ return ConstantExpr::get(Opcode, C2, C1);
}
// At this point we know neither constant is an UndefValue.
default:
break;
case Instruction::Add:
- return ConstantInt::get(Context, C1V + C2V);
+ return ConstantInt::get(CI1->getContext(), C1V + C2V);
case Instruction::Sub:
- return ConstantInt::get(Context, C1V - C2V);
+ return ConstantInt::get(CI1->getContext(), C1V - C2V);
case Instruction::Mul:
- return ConstantInt::get(Context, C1V * C2V);
+ return ConstantInt::get(CI1->getContext(), C1V * C2V);
case Instruction::UDiv:
assert(!CI2->isNullValue() && "Div by zero handled above");
- return ConstantInt::get(Context, C1V.udiv(C2V));
+ return ConstantInt::get(CI1->getContext(), C1V.udiv(C2V));
case Instruction::SDiv:
assert(!CI2->isNullValue() && "Div by zero handled above");
if (C2V.isAllOnesValue() && C1V.isMinSignedValue())
return UndefValue::get(CI1->getType()); // MIN_INT / -1 -> undef
- return ConstantInt::get(Context, C1V.sdiv(C2V));
+ return ConstantInt::get(CI1->getContext(), C1V.sdiv(C2V));
case Instruction::URem:
assert(!CI2->isNullValue() && "Div by zero handled above");
- return ConstantInt::get(Context, C1V.urem(C2V));
+ return ConstantInt::get(CI1->getContext(), C1V.urem(C2V));
case Instruction::SRem:
assert(!CI2->isNullValue() && "Div by zero handled above");
if (C2V.isAllOnesValue() && C1V.isMinSignedValue())
return UndefValue::get(CI1->getType()); // MIN_INT % -1 -> undef
- return ConstantInt::get(Context, C1V.srem(C2V));
+ return ConstantInt::get(CI1->getContext(), C1V.srem(C2V));
case Instruction::And:
- return ConstantInt::get(Context, C1V & C2V);
+ return ConstantInt::get(CI1->getContext(), C1V & C2V);
case Instruction::Or:
- return ConstantInt::get(Context, C1V | C2V);
+ return ConstantInt::get(CI1->getContext(), C1V | C2V);
case Instruction::Xor:
- return ConstantInt::get(Context, C1V ^ C2V);
+ return ConstantInt::get(CI1->getContext(), C1V ^ C2V);
case Instruction::Shl: {
uint32_t shiftAmt = C2V.getZExtValue();
if (shiftAmt < C1V.getBitWidth())
- return ConstantInt::get(Context, C1V.shl(shiftAmt));
+ return ConstantInt::get(CI1->getContext(), C1V.shl(shiftAmt));
else
return UndefValue::get(C1->getType()); // too big shift is undef
}
case Instruction::LShr: {
uint32_t shiftAmt = C2V.getZExtValue();
if (shiftAmt < C1V.getBitWidth())
- return ConstantInt::get(Context, C1V.lshr(shiftAmt));
+ return ConstantInt::get(CI1->getContext(), C1V.lshr(shiftAmt));
else
return UndefValue::get(C1->getType()); // too big shift is undef
}
case Instruction::AShr: {
uint32_t shiftAmt = C2V.getZExtValue();
if (shiftAmt < C1V.getBitWidth())
- return ConstantInt::get(Context, C1V.ashr(shiftAmt));
+ return ConstantInt::get(CI1->getContext(), C1V.ashr(shiftAmt));
else
return UndefValue::get(C1->getType()); // too big shift is undef
}
break;
case Instruction::FAdd:
(void)C3V.add(C2V, APFloat::rmNearestTiesToEven);
- return ConstantFP::get(Context, C3V);
+ return ConstantFP::get(C1->getContext(), C3V);
case Instruction::FSub:
(void)C3V.subtract(C2V, APFloat::rmNearestTiesToEven);
- return ConstantFP::get(Context, C3V);
+ return ConstantFP::get(C1->getContext(), C3V);
case Instruction::FMul:
(void)C3V.multiply(C2V, APFloat::rmNearestTiesToEven);
- return ConstantFP::get(Context, C3V);
+ return ConstantFP::get(C1->getContext(), C3V);
case Instruction::FDiv:
(void)C3V.divide(C2V, APFloat::rmNearestTiesToEven);
- return ConstantFP::get(Context, C3V);
+ return ConstantFP::get(C1->getContext(), C3V);
case Instruction::FRem:
(void)C3V.mod(C2V, APFloat::rmNearestTiesToEven);
- return ConstantFP::get(Context, C3V);
+ return ConstantFP::get(C1->getContext(), C3V);
}
}
} else if (const VectorType *VTy = dyn_cast<VectorType>(C1->getType())) {
}
}
- if (isa<ConstantExpr>(C1)) {
+ if (ConstantExpr *CE1 = dyn_cast<ConstantExpr>(C1)) {
// There are many possible foldings we could do here. We should probably
// at least fold add of a pointer with an integer into the appropriate
// getelementptr. This will improve alias analysis a bit.
+
+ // Given ((a + b) + c), if (b + c) folds to something interesting, return
+ // (a + (b + c)).
+ if (Instruction::isAssociative(Opcode) && CE1->getOpcode() == Opcode) {
+ Constant *T = ConstantExpr::get(Opcode, CE1->getOperand(1), C2);
+ if (!isa<ConstantExpr>(T) || cast<ConstantExpr>(T)->getOpcode() != Opcode)
+ return ConstantExpr::get(Opcode, CE1->getOperand(0), T);
+ }
} else if (isa<ConstantExpr>(C2)) {
// If C2 is a constant expr and C1 isn't, flop them around and fold the
// other way if possible.
- switch (Opcode) {
- case Instruction::Add:
- case Instruction::FAdd:
- case Instruction::Mul:
- case Instruction::FMul:
- case Instruction::And:
- case Instruction::Or:
- case Instruction::Xor:
- // No change of opcode required.
- return ConstantFoldBinaryInstruction(Context, Opcode, C2, C1);
-
- case Instruction::Shl:
- case Instruction::LShr:
- case Instruction::AShr:
- case Instruction::Sub:
- case Instruction::FSub:
- case Instruction::SDiv:
- case Instruction::UDiv:
- case Instruction::FDiv:
- case Instruction::URem:
- case Instruction::SRem:
- case Instruction::FRem:
- default: // These instructions cannot be flopped around.
- break;
- }
+ if (Instruction::isCommutative(Opcode))
+ return ConstantFoldBinaryInstruction(Opcode, C2, C1);
}
// i1 can be simplified in many cases.
- if (C1->getType() == Type::getInt1Ty(Context)) {
+ if (C1->getType()->isIntegerTy(1)) {
switch (Opcode) {
case Instruction::Add:
case Instruction::Sub:
case Instruction::SRem:
// We can assume that C2 == 1. If it were zero the result would be
// undefined through division by zero.
- return ConstantInt::getFalse(Context);
+ return ConstantInt::getFalse(C1->getContext());
default:
break;
}
/// isZeroSizedType - This type is zero sized if its an array or structure of
/// zero sized types. The only leaf zero sized type is an empty structure.
static bool isMaybeZeroSizedType(const Type *Ty) {
- if (isa<OpaqueType>(Ty)) return true; // Can't say.
+ if (Ty->isOpaqueTy()) return true; // Can't say.
if (const StructType *STy = dyn_cast<StructType>(Ty)) {
// If all of elements have zero size, this does too.
/// first is less than the second, return -1, if the second is less than the
/// first, return 1. If the constants are not integral, return -2.
///
-static int IdxCompare(LLVMContext &Context, Constant *C1, Constant *C2,
- const Type *ElTy) {
+static int IdxCompare(Constant *C1, Constant *C2, const Type *ElTy) {
if (C1 == C2) return 0;
// Ok, we found a different index. If they are not ConstantInt, we can't do
// Ok, we have two differing integer indices. Sign extend them to be the same
// type. Long is always big enough, so we use it.
- if (C1->getType() != Type::getInt64Ty(Context))
- C1 = ConstantExpr::getSExt(C1, Type::getInt64Ty(Context));
+ if (!C1->getType()->isIntegerTy(64))
+ C1 = ConstantExpr::getSExt(C1, Type::getInt64Ty(C1->getContext()));
- if (C2->getType() != Type::getInt64Ty(Context))
- C2 = ConstantExpr::getSExt(C2, Type::getInt64Ty(Context));
+ if (!C2->getType()->isIntegerTy(64))
+ C2 = ConstantExpr::getSExt(C2, Type::getInt64Ty(C1->getContext()));
if (C1 == C2) return 0; // They are equal
/// To simplify this code we canonicalize the relation so that the first
/// operand is always the most "complex" of the two. We consider ConstantFP
/// to be the simplest, and ConstantExprs to be the most complex.
-static FCmpInst::Predicate evaluateFCmpRelation(LLVMContext &Context,
- Constant *V1, Constant *V2) {
+static FCmpInst::Predicate evaluateFCmpRelation(Constant *V1, Constant *V2) {
assert(V1->getType() == V2->getType() &&
"Cannot compare values of different types!");
}
// If the first operand is simple and second is ConstantExpr, swap operands.
- FCmpInst::Predicate SwappedRelation = evaluateFCmpRelation(Context, V2, V1);
+ FCmpInst::Predicate SwappedRelation = evaluateFCmpRelation(V2, V1);
if (SwappedRelation != FCmpInst::BAD_FCMP_PREDICATE)
return FCmpInst::getSwappedPredicate(SwappedRelation);
} else {
/// constants (like ConstantInt) to be the simplest, followed by
/// GlobalValues, followed by ConstantExpr's (the most complex).
///
-static ICmpInst::Predicate evaluateICmpRelation(LLVMContext &Context,
- Constant *V1,
- Constant *V2,
+static ICmpInst::Predicate evaluateICmpRelation(Constant *V1, Constant *V2,
bool isSigned) {
assert(V1->getType() == V2->getType() &&
"Cannot compare different types of values!");
if (V1 == V2) return ICmpInst::ICMP_EQ;
- if (!isa<ConstantExpr>(V1) && !isa<GlobalValue>(V1)) {
- if (!isa<GlobalValue>(V2) && !isa<ConstantExpr>(V2)) {
+ if (!isa<ConstantExpr>(V1) && !isa<GlobalValue>(V1) &&
+ !isa<BlockAddress>(V1)) {
+ if (!isa<GlobalValue>(V2) && !isa<ConstantExpr>(V2) &&
+ !isa<BlockAddress>(V2)) {
// We distilled this down to a simple case, use the standard constant
// folder.
ConstantInt *R = 0;
// If the first operand is simple, swap operands.
ICmpInst::Predicate SwappedRelation =
- evaluateICmpRelation(Context, V2, V1, isSigned);
+ evaluateICmpRelation(V2, V1, isSigned);
if (SwappedRelation != ICmpInst::BAD_ICMP_PREDICATE)
return ICmpInst::getSwappedPredicate(SwappedRelation);
- } else if (const GlobalValue *CPR1 = dyn_cast<GlobalValue>(V1)) {
+ } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(V1)) {
if (isa<ConstantExpr>(V2)) { // Swap as necessary.
ICmpInst::Predicate SwappedRelation =
- evaluateICmpRelation(Context, V2, V1, isSigned);
+ evaluateICmpRelation(V2, V1, isSigned);
if (SwappedRelation != ICmpInst::BAD_ICMP_PREDICATE)
return ICmpInst::getSwappedPredicate(SwappedRelation);
- else
- return ICmpInst::BAD_ICMP_PREDICATE;
+ return ICmpInst::BAD_ICMP_PREDICATE;
}
- // Now we know that the RHS is a GlobalValue or simple constant,
- // which (since the types must match) means that it's a ConstantPointerNull.
- if (const GlobalValue *CPR2 = dyn_cast<GlobalValue>(V2)) {
+ // Now we know that the RHS is a GlobalValue, BlockAddress or simple
+ // constant (which, since the types must match, means that it's a
+ // ConstantPointerNull).
+ if (const GlobalValue *GV2 = dyn_cast<GlobalValue>(V2)) {
// Don't try to decide equality of aliases.
- if (!isa<GlobalAlias>(CPR1) && !isa<GlobalAlias>(CPR2))
- if (!CPR1->hasExternalWeakLinkage() || !CPR2->hasExternalWeakLinkage())
+ if (!isa<GlobalAlias>(GV) && !isa<GlobalAlias>(GV2))
+ if (!GV->hasExternalWeakLinkage() || !GV2->hasExternalWeakLinkage())
return ICmpInst::ICMP_NE;
+ } else if (isa<BlockAddress>(V2)) {
+ return ICmpInst::ICMP_NE; // Globals never equal labels.
} else {
assert(isa<ConstantPointerNull>(V2) && "Canonicalization guarantee!");
- // GlobalVals can never be null. Don't try to evaluate aliases.
- if (!CPR1->hasExternalWeakLinkage() && !isa<GlobalAlias>(CPR1))
+ // GlobalVals can never be null unless they have external weak linkage.
+ // We don't try to evaluate aliases here.
+ if (!GV->hasExternalWeakLinkage() && !isa<GlobalAlias>(GV))
+ return ICmpInst::ICMP_NE;
+ }
+ } else if (const BlockAddress *BA = dyn_cast<BlockAddress>(V1)) {
+ if (isa<ConstantExpr>(V2)) { // Swap as necessary.
+ ICmpInst::Predicate SwappedRelation =
+ evaluateICmpRelation(V2, V1, isSigned);
+ if (SwappedRelation != ICmpInst::BAD_ICMP_PREDICATE)
+ return ICmpInst::getSwappedPredicate(SwappedRelation);
+ return ICmpInst::BAD_ICMP_PREDICATE;
+ }
+
+ // Now we know that the RHS is a GlobalValue, BlockAddress or simple
+ // constant (which, since the types must match, means that it is a
+ // ConstantPointerNull).
+ if (const BlockAddress *BA2 = dyn_cast<BlockAddress>(V2)) {
+ // Block address in another function can't equal this one, but block
+ // addresses in the current function might be the same if blocks are
+ // empty.
+ if (BA2->getFunction() != BA->getFunction())
return ICmpInst::ICMP_NE;
+ } else {
+ // Block addresses aren't null, don't equal the address of globals.
+ assert((isa<ConstantPointerNull>(V2) || isa<GlobalValue>(V2)) &&
+ "Canonicalization guarantee!");
+ return ICmpInst::ICMP_NE;
}
} else {
// Ok, the LHS is known to be a constantexpr. The RHS can be any of a
- // constantexpr, a CPR, or a simple constant.
+ // constantexpr, a global, block address, or a simple constant.
ConstantExpr *CE1 = cast<ConstantExpr>(V1);
Constant *CE1Op0 = CE1->getOperand(0);
// If the cast is not actually changing bits, and the second operand is a
// null pointer, do the comparison with the pre-casted value.
if (V2->isNullValue() &&
- (isa<PointerType>(CE1->getType()) || CE1->getType()->isInteger())) {
+ (CE1->getType()->isPointerTy() || CE1->getType()->isIntegerTy())) {
if (CE1->getOpcode() == Instruction::ZExt) isSigned = false;
if (CE1->getOpcode() == Instruction::SExt) isSigned = true;
- return evaluateICmpRelation(Context, CE1Op0,
+ return evaluateICmpRelation(CE1Op0,
Constant::getNullValue(CE1Op0->getType()),
isSigned);
}
return ICmpInst::ICMP_EQ;
}
// Otherwise, we can't really say if the first operand is null or not.
- } else if (const GlobalValue *CPR2 = dyn_cast<GlobalValue>(V2)) {
+ } else if (const GlobalValue *GV2 = dyn_cast<GlobalValue>(V2)) {
if (isa<ConstantPointerNull>(CE1Op0)) {
- if (CPR2->hasExternalWeakLinkage())
+ if (GV2->hasExternalWeakLinkage())
// Weak linkage GVals could be zero or not. We're comparing it to
// a null pointer, so its less-or-equal
return isSigned ? ICmpInst::ICMP_SLE : ICmpInst::ICMP_ULE;
// If its not weak linkage, the GVal must have a non-zero address
// so the result is less-than
return isSigned ? ICmpInst::ICMP_SLT : ICmpInst::ICMP_ULT;
- } else if (const GlobalValue *CPR1 = dyn_cast<GlobalValue>(CE1Op0)) {
- if (CPR1 == CPR2) {
+ } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CE1Op0)) {
+ if (GV == GV2) {
// If this is a getelementptr of the same global, then it must be
// different. Because the types must match, the getelementptr could
// only have at most one index, and because we fold getelementptr's
// with a single zero index, it must be nonzero.
assert(CE1->getNumOperands() == 2 &&
!CE1->getOperand(1)->isNullValue() &&
- "Suprising getelementptr!");
+ "Surprising getelementptr!");
return isSigned ? ICmpInst::ICMP_SGT : ICmpInst::ICMP_UGT;
} else {
// If they are different globals, we don't know what the value is,
gep_type_iterator GTI = gep_type_begin(CE1);
for (;i != CE1->getNumOperands() && i != CE2->getNumOperands();
++i, ++GTI)
- switch (IdxCompare(Context, CE1->getOperand(i),
+ switch (IdxCompare(CE1->getOperand(i),
CE2->getOperand(i), GTI.getIndexedType())) {
case -1: return isSigned ? ICmpInst::ICMP_SLT:ICmpInst::ICMP_ULT;
case 1: return isSigned ? ICmpInst::ICMP_SGT:ICmpInst::ICMP_UGT;
return ICmpInst::BAD_ICMP_PREDICATE;
}
-Constant *llvm::ConstantFoldCompareInstruction(LLVMContext &Context,
- unsigned short pred,
+Constant *llvm::ConstantFoldCompareInstruction(unsigned short pred,
Constant *C1, Constant *C2) {
const Type *ResultTy;
if (const VectorType *VT = dyn_cast<VectorType>(C1->getType()))
- ResultTy = VectorType::get(Type::getInt1Ty(Context), VT->getNumElements());
+ ResultTy = VectorType::get(Type::getInt1Ty(C1->getContext()),
+ VT->getNumElements());
else
- ResultTy = Type::getInt1Ty(Context);
+ ResultTy = Type::getInt1Ty(C1->getContext());
// Fold FCMP_FALSE/FCMP_TRUE unconditionally.
if (pred == FCmpInst::FCMP_FALSE)
return Constant::getAllOnesValue(ResultTy);
// Handle some degenerate cases first
- if (isa<UndefValue>(C1) || isa<UndefValue>(C2))
- return UndefValue::get(ResultTy);
+ if (isa<UndefValue>(C1) || isa<UndefValue>(C2)) {
+ // For EQ and NE, we can always pick a value for the undef to make the
+ // predicate pass or fail, so we can return undef.
+ if (ICmpInst::isEquality(ICmpInst::Predicate(pred)))
+ return UndefValue::get(ResultTy);
+ // Otherwise, pick the same value as the non-undef operand, and fold
+ // it to true or false.
+ return ConstantInt::get(ResultTy, CmpInst::isTrueWhenEqual(pred));
+ }
// No compile-time operations on this type yet.
if (C1->getType()->isPPC_FP128Ty())
// Don't try to evaluate aliases. External weak GV can be null.
if (!isa<GlobalAlias>(GV) && !GV->hasExternalWeakLinkage()) {
if (pred == ICmpInst::ICMP_EQ)
- return ConstantInt::getFalse(Context);
+ return ConstantInt::getFalse(C1->getContext());
else if (pred == ICmpInst::ICMP_NE)
- return ConstantInt::getTrue(Context);
+ return ConstantInt::getTrue(C1->getContext());
}
// icmp eq/ne(GV,null) -> false/true
} else if (C2->isNullValue()) {
// Don't try to evaluate aliases. External weak GV can be null.
if (!isa<GlobalAlias>(GV) && !GV->hasExternalWeakLinkage()) {
if (pred == ICmpInst::ICMP_EQ)
- return ConstantInt::getFalse(Context);
+ return ConstantInt::getFalse(C1->getContext());
else if (pred == ICmpInst::ICMP_NE)
- return ConstantInt::getTrue(Context);
+ return ConstantInt::getTrue(C1->getContext());
}
}
// If the comparison is a comparison between two i1's, simplify it.
- if (C1->getType() == Type::getInt1Ty(Context)) {
+ if (C1->getType()->isIntegerTy(1)) {
switch(pred) {
case ICmpInst::ICMP_EQ:
if (isa<ConstantInt>(C2))
APInt V2 = cast<ConstantInt>(C2)->getValue();
switch (pred) {
default: llvm_unreachable("Invalid ICmp Predicate"); return 0;
- case ICmpInst::ICMP_EQ:
- return ConstantInt::get(Type::getInt1Ty(Context), V1 == V2);
- case ICmpInst::ICMP_NE:
- return ConstantInt::get(Type::getInt1Ty(Context), V1 != V2);
- case ICmpInst::ICMP_SLT:
- return ConstantInt::get(Type::getInt1Ty(Context), V1.slt(V2));
- case ICmpInst::ICMP_SGT:
- return ConstantInt::get(Type::getInt1Ty(Context), V1.sgt(V2));
- case ICmpInst::ICMP_SLE:
- return ConstantInt::get(Type::getInt1Ty(Context), V1.sle(V2));
- case ICmpInst::ICMP_SGE:
- return ConstantInt::get(Type::getInt1Ty(Context), V1.sge(V2));
- case ICmpInst::ICMP_ULT:
- return ConstantInt::get(Type::getInt1Ty(Context), V1.ult(V2));
- case ICmpInst::ICMP_UGT:
- return ConstantInt::get(Type::getInt1Ty(Context), V1.ugt(V2));
- case ICmpInst::ICMP_ULE:
- return ConstantInt::get(Type::getInt1Ty(Context), V1.ule(V2));
- case ICmpInst::ICMP_UGE:
- return ConstantInt::get(Type::getInt1Ty(Context), V1.uge(V2));
+ case ICmpInst::ICMP_EQ: return ConstantInt::get(ResultTy, V1 == V2);
+ case ICmpInst::ICMP_NE: return ConstantInt::get(ResultTy, V1 != V2);
+ case ICmpInst::ICMP_SLT: return ConstantInt::get(ResultTy, V1.slt(V2));
+ case ICmpInst::ICMP_SGT: return ConstantInt::get(ResultTy, V1.sgt(V2));
+ case ICmpInst::ICMP_SLE: return ConstantInt::get(ResultTy, V1.sle(V2));
+ case ICmpInst::ICMP_SGE: return ConstantInt::get(ResultTy, V1.sge(V2));
+ case ICmpInst::ICMP_ULT: return ConstantInt::get(ResultTy, V1.ult(V2));
+ case ICmpInst::ICMP_UGT: return ConstantInt::get(ResultTy, V1.ugt(V2));
+ case ICmpInst::ICMP_ULE: return ConstantInt::get(ResultTy, V1.ule(V2));
+ case ICmpInst::ICMP_UGE: return ConstantInt::get(ResultTy, V1.uge(V2));
}
} else if (isa<ConstantFP>(C1) && isa<ConstantFP>(C2)) {
APFloat C1V = cast<ConstantFP>(C1)->getValueAPF();
APFloat::cmpResult R = C1V.compare(C2V);
switch (pred) {
default: llvm_unreachable("Invalid FCmp Predicate"); return 0;
- case FCmpInst::FCMP_FALSE: return ConstantInt::getFalse(Context);
- case FCmpInst::FCMP_TRUE: return ConstantInt::getTrue(Context);
+ case FCmpInst::FCMP_FALSE: return Constant::getNullValue(ResultTy);
+ case FCmpInst::FCMP_TRUE: return Constant::getAllOnesValue(ResultTy);
case FCmpInst::FCMP_UNO:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpUnordered);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpUnordered);
case FCmpInst::FCMP_ORD:
- return ConstantInt::get(Type::getInt1Ty(Context), R!=APFloat::cmpUnordered);
+ return ConstantInt::get(ResultTy, R!=APFloat::cmpUnordered);
case FCmpInst::FCMP_UEQ:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpUnordered ||
- R==APFloat::cmpEqual);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpUnordered ||
+ R==APFloat::cmpEqual);
case FCmpInst::FCMP_OEQ:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpEqual);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpEqual);
case FCmpInst::FCMP_UNE:
- return ConstantInt::get(Type::getInt1Ty(Context), R!=APFloat::cmpEqual);
+ return ConstantInt::get(ResultTy, R!=APFloat::cmpEqual);
case FCmpInst::FCMP_ONE:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpLessThan ||
- R==APFloat::cmpGreaterThan);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpLessThan ||
+ R==APFloat::cmpGreaterThan);
case FCmpInst::FCMP_ULT:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpUnordered ||
- R==APFloat::cmpLessThan);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpUnordered ||
+ R==APFloat::cmpLessThan);
case FCmpInst::FCMP_OLT:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpLessThan);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpLessThan);
case FCmpInst::FCMP_UGT:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpUnordered ||
- R==APFloat::cmpGreaterThan);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpUnordered ||
+ R==APFloat::cmpGreaterThan);
case FCmpInst::FCMP_OGT:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpGreaterThan);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpGreaterThan);
case FCmpInst::FCMP_ULE:
- return ConstantInt::get(Type::getInt1Ty(Context), R!=APFloat::cmpGreaterThan);
+ return ConstantInt::get(ResultTy, R!=APFloat::cmpGreaterThan);
case FCmpInst::FCMP_OLE:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpLessThan ||
- R==APFloat::cmpEqual);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpLessThan ||
+ R==APFloat::cmpEqual);
case FCmpInst::FCMP_UGE:
- return ConstantInt::get(Type::getInt1Ty(Context), R!=APFloat::cmpLessThan);
+ return ConstantInt::get(ResultTy, R!=APFloat::cmpLessThan);
case FCmpInst::FCMP_OGE:
- return ConstantInt::get(Type::getInt1Ty(Context), R==APFloat::cmpGreaterThan ||
- R==APFloat::cmpEqual);
+ return ConstantInt::get(ResultTy, R==APFloat::cmpGreaterThan ||
+ R==APFloat::cmpEqual);
}
- } else if (isa<VectorType>(C1->getType())) {
+ } else if (C1->getType()->isVectorTy()) {
SmallVector<Constant*, 16> C1Elts, C2Elts;
- C1->getVectorElements(Context, C1Elts);
- C2->getVectorElements(Context, C2Elts);
+ C1->getVectorElements(C1Elts);
+ C2->getVectorElements(C2Elts);
+ if (C1Elts.empty() || C2Elts.empty())
+ return 0;
// If we can constant fold the comparison of each element, constant fold
// the whole vector comparison.
SmallVector<Constant*, 4> ResElts;
- for (unsigned i = 0, e = C1Elts.size(); i != e; ++i) {
- // Compare the elements, producing an i1 result or constant expr.
- ResElts.push_back(
- ConstantExpr::getCompare(pred, C1Elts[i], C2Elts[i]));
- }
- return ConstantVector::get(&ResElts[0], ResElts.size());
+ // Compare the elements, producing an i1 result or constant expr.
+ for (unsigned i = 0, e = C1Elts.size(); i != e; ++i)
+ ResElts.push_back(ConstantExpr::getCompare(pred, C1Elts[i], C2Elts[i]));
+
+ return ConstantVector::get(ResElts);
}
- if (C1->getType()->isFloatingPoint()) {
+ if (C1->getType()->isFloatingPointTy()) {
int Result = -1; // -1 = unknown, 0 = known false, 1 = known true.
- switch (evaluateFCmpRelation(Context, C1, C2)) {
+ switch (evaluateFCmpRelation(C1, C2)) {
default: llvm_unreachable("Unknown relation!");
case FCmpInst::FCMP_UNO:
case FCmpInst::FCMP_ORD:
else if (pred == FCmpInst::FCMP_UGT || pred == FCmpInst::FCMP_OGT)
Result = 1;
break;
- case ICmpInst::ICMP_NE: // We know that C1 != C2
+ case FCmpInst::FCMP_ONE: // We know that C1 != C2
// We can only partially decide this relation.
if (pred == FCmpInst::FCMP_OEQ || pred == FCmpInst::FCMP_UEQ)
Result = 0;
// If we evaluated the result, return it now.
if (Result != -1)
- return ConstantInt::get(Type::getInt1Ty(Context), Result);
+ return ConstantInt::get(ResultTy, Result);
} else {
// Evaluate the relation between the two constants, per the predicate.
int Result = -1; // -1 = unknown, 0 = known false, 1 = known true.
- switch (evaluateICmpRelation(Context, C1, C2, CmpInst::isSigned(pred))) {
+ switch (evaluateICmpRelation(C1, C2, CmpInst::isSigned(pred))) {
default: llvm_unreachable("Unknown relational!");
case ICmpInst::BAD_ICMP_PREDICATE:
break; // Couldn't determine anything about these constants.
// If we evaluated the result, return it now.
if (Result != -1)
- return ConstantInt::get(Type::getInt1Ty(Context), Result);
+ return ConstantInt::get(ResultTy, Result);
// If the right hand side is a bitcast, try using its inverse to simplify
- // it by moving it to the left hand side.
+ // it by moving it to the left hand side. We can't do this if it would turn
+ // a vector compare into a scalar compare or visa versa.
if (ConstantExpr *CE2 = dyn_cast<ConstantExpr>(C2)) {
- if (CE2->getOpcode() == Instruction::BitCast) {
- Constant *CE2Op0 = CE2->getOperand(0);
+ Constant *CE2Op0 = CE2->getOperand(0);
+ if (CE2->getOpcode() == Instruction::BitCast &&
+ CE2->getType()->isVectorTy() == CE2Op0->getType()->isVectorTy()) {
Constant *Inverse = ConstantExpr::getBitCast(C1, CE2Op0->getType());
return ConstantExpr::getICmp(pred, Inverse, CE2Op0);
}
// If the left hand side is an extension, try eliminating it.
if (ConstantExpr *CE1 = dyn_cast<ConstantExpr>(C1)) {
- if (CE1->getOpcode() == Instruction::SExt ||
- CE1->getOpcode() == Instruction::ZExt) {
+ if ((CE1->getOpcode() == Instruction::SExt && ICmpInst::isSigned(pred)) ||
+ (CE1->getOpcode() == Instruction::ZExt && !ICmpInst::isSigned(pred))){
Constant *CE1Op0 = CE1->getOperand(0);
Constant *CE1Inverse = ConstantExpr::getTrunc(CE1, CE1Op0->getType());
if (CE1Inverse == CE1Op0) {
}
}
- if (!isa<ConstantExpr>(C1) && isa<ConstantExpr>(C2)) {
+ if ((!isa<ConstantExpr>(C1) && isa<ConstantExpr>(C2)) ||
+ (C1->isNullValue() && !C2->isNullValue())) {
// If C2 is a constant expr and C1 isn't, flip them around and fold the
// other way if possible.
- switch (pred) {
- case ICmpInst::ICMP_EQ:
- case ICmpInst::ICMP_NE:
- // No change of predicate required.
- return ConstantFoldCompareInstruction(Context, pred, C2, C1);
-
- case ICmpInst::ICMP_ULT:
- case ICmpInst::ICMP_SLT:
- case ICmpInst::ICMP_UGT:
- case ICmpInst::ICMP_SGT:
- case ICmpInst::ICMP_ULE:
- case ICmpInst::ICMP_SLE:
- case ICmpInst::ICMP_UGE:
- case ICmpInst::ICMP_SGE:
- // Change the predicate as necessary to swap the operands.
- pred = ICmpInst::getSwappedPredicate((ICmpInst::Predicate)pred);
- return ConstantFoldCompareInstruction(Context, pred, C2, C1);
-
- default: // These predicates cannot be flopped around.
- break;
- }
+ // Also, if C1 is null and C2 isn't, flip them around.
+ pred = ICmpInst::getSwappedPredicate((ICmpInst::Predicate)pred);
+ return ConstantExpr::getICmp(pred, C2, C1);
}
}
return 0;
/// isInBoundsIndices - Test whether the given sequence of *normalized* indices
/// is "inbounds".
-static bool isInBoundsIndices(Constant *const *Idxs, size_t NumIdx) {
+template<typename IndexTy>
+static bool isInBoundsIndices(IndexTy const *Idxs, size_t NumIdx) {
// No indices means nothing that could be out of bounds.
if (NumIdx == 0) return true;
// If the first index is zero, it's in bounds.
- if (Idxs[0]->isNullValue()) return true;
+ if (cast<Constant>(Idxs[0])->isNullValue()) return true;
// If the first index is one and all the rest are zero, it's in bounds,
// by the one-past-the-end rule.
if (!cast<ConstantInt>(Idxs[0])->isOne())
return false;
for (unsigned i = 1, e = NumIdx; i != e; ++i)
- if (!Idxs[i]->isNullValue())
+ if (!cast<Constant>(Idxs[i])->isNullValue())
return false;
return true;
}
-Constant *llvm::ConstantFoldGetElementPtr(LLVMContext &Context,
- Constant *C,
- bool inBounds,
- Constant* const *Idxs,
- unsigned NumIdx) {
+template<typename IndexTy>
+static Constant *ConstantFoldGetElementPtrImpl(Constant *C,
+ bool inBounds,
+ IndexTy const *Idxs,
+ unsigned NumIdx) {
+ Constant *Idx0 = cast<Constant>(Idxs[0]);
if (NumIdx == 0 ||
- (NumIdx == 1 && Idxs[0]->isNullValue()))
+ (NumIdx == 1 && Idx0->isNullValue()))
return C;
if (isa<UndefValue>(C)) {
const PointerType *Ptr = cast<PointerType>(C->getType());
- const Type *Ty = GetElementPtrInst::getIndexedType(Ptr,
- (Value **)Idxs,
- (Value **)Idxs+NumIdx);
+ const Type *Ty = GetElementPtrInst::getIndexedType(Ptr, Idxs, Idxs+NumIdx);
assert(Ty != 0 && "Invalid indices for GEP!");
return UndefValue::get(PointerType::get(Ty, Ptr->getAddressSpace()));
}
- Constant *Idx0 = Idxs[0];
if (C->isNullValue()) {
bool isNull = true;
for (unsigned i = 0, e = NumIdx; i != e; ++i)
- if (!Idxs[i]->isNullValue()) {
+ if (!cast<Constant>(Idxs[i])->isNullValue()) {
isNull = false;
break;
}
if (isNull) {
const PointerType *Ptr = cast<PointerType>(C->getType());
- const Type *Ty = GetElementPtrInst::getIndexedType(Ptr,
- (Value**)Idxs,
- (Value**)Idxs+NumIdx);
+ const Type *Ty = GetElementPtrInst::getIndexedType(Ptr, Idxs,
+ Idxs+NumIdx);
assert(Ty != 0 && "Invalid indices for GEP!");
- return ConstantPointerNull::get(
- PointerType::get(Ty,Ptr->getAddressSpace()));
+ return ConstantPointerNull::get(PointerType::get(Ty,
+ Ptr->getAddressSpace()));
}
}
I != E; ++I)
LastTy = *I;
- if ((LastTy && isa<ArrayType>(LastTy)) || Idx0->isNullValue()) {
+ if ((LastTy && LastTy->isArrayTy()) || Idx0->isNullValue()) {
SmallVector<Value*, 16> NewIndices;
NewIndices.reserve(NumIdx + CE->getNumOperands());
for (unsigned i = 1, e = CE->getNumOperands()-1; i != e; ++i)
if (!Idx0->isNullValue()) {
const Type *IdxTy = Combined->getType();
if (IdxTy != Idx0->getType()) {
- Constant *C1 =
- ConstantExpr::getSExtOrBitCast(Idx0, Type::getInt64Ty(Context));
- Constant *C2 = ConstantExpr::getSExtOrBitCast(Combined,
- Type::getInt64Ty(Context));
+ const Type *Int64Ty = Type::getInt64Ty(IdxTy->getContext());
+ Constant *C1 = ConstantExpr::getSExtOrBitCast(Idx0, Int64Ty);
+ Constant *C2 = ConstantExpr::getSExtOrBitCast(Combined, Int64Ty);
Combined = ConstantExpr::get(Instruction::Add, C1, C2);
} else {
Combined =
}
NewIndices.push_back(Combined);
- NewIndices.insert(NewIndices.end(), Idxs+1, Idxs+NumIdx);
+ NewIndices.append(Idxs+1, Idxs+NumIdx);
return (inBounds && cast<GEPOperator>(CE)->isInBounds()) ?
ConstantExpr::getInBoundsGetElementPtr(CE->getOperand(0),
&NewIndices[0],
}
// Implement folding of:
- // int* getelementptr ([2 x int]* cast ([3 x int]* %X to [2 x int]*),
- // long 0, long 0)
- // To: int* getelementptr ([3 x int]* %X, long 0, long 0)
+ // i32* getelementptr ([2 x i32]* bitcast ([3 x i32]* %X to [2 x i32]*),
+ // i64 0, i64 0)
+ // To: i32* getelementptr ([3 x i32]* %X, i64 0, i64 0)
//
if (CE->isCast() && NumIdx > 1 && Idx0->isNullValue()) {
if (const PointerType *SPT =
ConstantExpr::getGetElementPtr(
(Constant*)CE->getOperand(0), Idxs, NumIdx);
}
-
- // Fold: getelementptr (i8* inttoptr (i64 1 to i8*), i32 -1)
- // Into: inttoptr (i64 0 to i8*)
- // This happens with pointers to member functions in C++.
- if (CE->getOpcode() == Instruction::IntToPtr && NumIdx == 1 &&
- isa<ConstantInt>(CE->getOperand(0)) && isa<ConstantInt>(Idxs[0]) &&
- cast<PointerType>(CE->getType())->getElementType() ==
- Type::getInt8Ty(Context)) {
- Constant *Base = CE->getOperand(0);
- Constant *Offset = Idxs[0];
-
- // Convert the smaller integer to the larger type.
- if (Offset->getType()->getPrimitiveSizeInBits() <
- Base->getType()->getPrimitiveSizeInBits())
- Offset = ConstantExpr::getSExt(Offset, Base->getType());
- else if (Base->getType()->getPrimitiveSizeInBits() <
- Offset->getType()->getPrimitiveSizeInBits())
- Base = ConstantExpr::getZExt(Base, Offset->getType());
-
- Base = ConstantExpr::getAdd(Base, Offset);
- return ConstantExpr::getIntToPtr(Base, CE->getType());
- }
}
// Check to see if any array indices are not within the corresponding
ATy->getNumElements());
NewIdxs[i] = ConstantExpr::getSRem(CI, Factor);
- Constant *PrevIdx = Idxs[i-1];
+ Constant *PrevIdx = cast<Constant>(Idxs[i-1]);
Constant *Div = ConstantExpr::getSDiv(CI, Factor);
// Before adding, extend both operands to i64 to avoid
// overflow trouble.
- if (PrevIdx->getType() != Type::getInt64Ty(Context))
+ if (!PrevIdx->getType()->isIntegerTy(64))
PrevIdx = ConstantExpr::getSExt(PrevIdx,
- Type::getInt64Ty(Context));
- if (Div->getType() != Type::getInt64Ty(Context))
+ Type::getInt64Ty(Div->getContext()));
+ if (!Div->getType()->isIntegerTy(64))
Div = ConstantExpr::getSExt(Div,
- Type::getInt64Ty(Context));
+ Type::getInt64Ty(Div->getContext()));
NewIdxs[i-1] = ConstantExpr::getAdd(PrevIdx, Div);
} else {
// If we did any factoring, start over with the adjusted indices.
if (!NewIdxs.empty()) {
for (unsigned i = 0; i != NumIdx; ++i)
- if (!NewIdxs[i]) NewIdxs[i] = Idxs[i];
+ if (!NewIdxs[i]) NewIdxs[i] = cast<Constant>(Idxs[i]);
return inBounds ?
ConstantExpr::getInBoundsGetElementPtr(C, NewIdxs.data(),
NewIdxs.size()) :
return 0;
}
+
+Constant *llvm::ConstantFoldGetElementPtr(Constant *C,
+ bool inBounds,
+ Constant* const *Idxs,
+ unsigned NumIdx) {
+ return ConstantFoldGetElementPtrImpl(C, inBounds, Idxs, NumIdx);
+}
+
+Constant *llvm::ConstantFoldGetElementPtr(Constant *C,
+ bool inBounds,
+ Value* const *Idxs,
+ unsigned NumIdx) {
+ return ConstantFoldGetElementPtrImpl(C, inBounds, Idxs, NumIdx);
+}
projects / oota-llvm.git / blobdiff