if (C->isAllOnesValue() && !DestTy->isX86_MMXTy())
return Constant::getAllOnesValue(DestTy);
+ // Handle a vector->integer cast.
+ if (IntegerType *IT = dyn_cast<IntegerType>(DestTy)) {
+ ConstantDataVector *CDV = dyn_cast<ConstantDataVector>(C);
+ if (CDV == 0)
+ return ConstantExpr::getBitCast(C, DestTy);
+
+ unsigned NumSrcElts = CDV->getType()->getNumElements();
+
+ Type *SrcEltTy = CDV->getType()->getElementType();
+
+ // If the vector is a vector of floating point, convert it to vector of int
+ // to simplify things.
+ if (SrcEltTy->isFloatingPointTy()) {
+ unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits();
+ Type *SrcIVTy =
+ VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElts);
+ // Ask VMCore to do the conversion now that #elts line up.
+ C = ConstantExpr::getBitCast(C, SrcIVTy);
+ CDV = cast<ConstantDataVector>(C);
+ }
+
+ // Now that we know that the input value is a vector of integers, just shift
+ // and insert them into our result.
+ unsigned BitShift = TD.getTypeAllocSizeInBits(SrcEltTy);
+ APInt Result(IT->getBitWidth(), 0);
+ for (unsigned i = 0; i != NumSrcElts; ++i) {
+ Result <<= BitShift;
+ if (TD.isLittleEndian())
+ Result |= CDV->getElementAsInteger(NumSrcElts-i-1);
+ else
+ Result |= CDV->getElementAsInteger(i);
+ }
+
+ return ConstantInt::get(IT, Result);
+ }
+
// The code below only handles casts to vectors currently.
VectorType *DestVTy = dyn_cast<VectorType>(DestTy);
if (DestVTy == 0)
}
// If this is a bitcast from constant vector -> vector, fold it.
- ConstantVector *CV = dyn_cast<ConstantVector>(C);
- if (CV == 0)
+ if (!isa<ConstantDataVector>(C) && !isa<ConstantVector>(C))
return ConstantExpr::getBitCast(C, DestTy);
// If the element types match, VMCore can fold it.
unsigned NumDstElt = DestVTy->getNumElements();
- unsigned NumSrcElt = CV->getNumOperands();
+ unsigned NumSrcElt = C->getType()->getVectorNumElements();
if (NumDstElt == NumSrcElt)
return ConstantExpr::getBitCast(C, DestTy);
- Type *SrcEltTy = CV->getType()->getElementType();
+ Type *SrcEltTy = C->getType()->getVectorElementType();
Type *DstEltTy = DestVTy->getElementType();
// Otherwise, we're changing the number of elements in a vector, which
VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumDstElt);
// Recursively handle this integer conversion, if possible.
C = FoldBitCast(C, DestIVTy, TD);
- if (!C) return ConstantExpr::getBitCast(C, DestTy);
// Finally, VMCore can handle this now that #elts line up.
return ConstantExpr::getBitCast(C, DestTy);
VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElt);
// Ask VMCore to do the conversion now that #elts line up.
C = ConstantExpr::getBitCast(C, SrcIVTy);
- CV = dyn_cast<ConstantVector>(C);
- if (!CV) // If VMCore wasn't able to fold it, bail out.
+ // If VMCore wasn't able to fold it, bail out.
+ if (!isa<ConstantVector>(C) && // FIXME: Remove ConstantVector.
+ !isa<ConstantDataVector>(C))
return C;
}
Constant *Elt = Zero;
unsigned ShiftAmt = isLittleEndian ? 0 : SrcBitSize*(Ratio-1);
for (unsigned j = 0; j != Ratio; ++j) {
- Constant *Src = dyn_cast<ConstantInt>(CV->getOperand(SrcElt++));
+ Constant *Src =dyn_cast<ConstantInt>(C->getAggregateElement(SrcElt++));
if (!Src) // Reject constantexpr elements.
return ConstantExpr::getBitCast(C, DestTy);
}
Result.push_back(Elt);
}
- } else {
- // Handle: bitcast (<2 x i64> <i64 0, i64 1> to <4 x i32>)
- unsigned Ratio = NumDstElt/NumSrcElt;
- unsigned DstBitSize = DstEltTy->getPrimitiveSizeInBits();
+ return ConstantVector::get(Result);
+ }
+
+ // Handle: bitcast (<2 x i64> <i64 0, i64 1> to <4 x i32>)
+ unsigned Ratio = NumDstElt/NumSrcElt;
+ unsigned DstBitSize = DstEltTy->getPrimitiveSizeInBits();
+
+ // Loop over each source value, expanding into multiple results.
+ for (unsigned i = 0; i != NumSrcElt; ++i) {
+ Constant *Src = dyn_cast<ConstantInt>(C->getAggregateElement(i));
+ if (!Src) // Reject constantexpr elements.
+ return ConstantExpr::getBitCast(C, DestTy);
- // Loop over each source value, expanding into multiple results.
- for (unsigned i = 0; i != NumSrcElt; ++i) {
- Constant *Src = dyn_cast<ConstantInt>(CV->getOperand(i));
- if (!Src) // Reject constantexpr elements.
- return ConstantExpr::getBitCast(C, DestTy);
+ unsigned ShiftAmt = isLittleEndian ? 0 : DstBitSize*(Ratio-1);
+ for (unsigned j = 0; j != Ratio; ++j) {
+ // Shift the piece of the value into the right place, depending on
+ // endianness.
+ Constant *Elt = ConstantExpr::getLShr(Src,
+ ConstantInt::get(Src->getType(), ShiftAmt));
+ ShiftAmt += isLittleEndian ? DstBitSize : -DstBitSize;
- unsigned ShiftAmt = isLittleEndian ? 0 : DstBitSize*(Ratio-1);
- for (unsigned j = 0; j != Ratio; ++j) {
- // Shift the piece of the value into the right place, depending on
- // endianness.
- Constant *Elt = ConstantExpr::getLShr(Src,
- ConstantInt::get(Src->getType(), ShiftAmt));
- ShiftAmt += isLittleEndian ? DstBitSize : -DstBitSize;
-
- // Truncate and remember this piece.
- Result.push_back(ConstantExpr::getTrunc(Elt, DstEltTy));
- }
+ // Truncate and remember this piece.
+ Result.push_back(ConstantExpr::getTrunc(Elt, DstEltTy));
}
}
// not reached.
}
- if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
- uint64_t EltSize = TD.getTypeAllocSize(CA->getType()->getElementType());
- uint64_t Index = ByteOffset / EltSize;
- uint64_t Offset = ByteOffset - Index * EltSize;
- for (; Index != CA->getType()->getNumElements(); ++Index) {
- if (!ReadDataFromGlobal(CA->getOperand(Index), Offset, CurPtr,
- BytesLeft, TD))
- return false;
- if (EltSize >= BytesLeft)
- return true;
-
- Offset = 0;
- BytesLeft -= EltSize;
- CurPtr += EltSize;
- }
- return true;
- }
-
- if (ConstantVector *CV = dyn_cast<ConstantVector>(C)) {
- uint64_t EltSize = TD.getTypeAllocSize(CV->getType()->getElementType());
+ if (isa<ConstantArray>(C) || isa<ConstantVector>(C) ||
+ isa<ConstantDataSequential>(C)) {
+ Type *EltTy = cast<SequentialType>(C->getType())->getElementType();
+ uint64_t EltSize = TD.getTypeAllocSize(EltTy);
uint64_t Index = ByteOffset / EltSize;
uint64_t Offset = ByteOffset - Index * EltSize;
- for (; Index != CV->getType()->getNumElements(); ++Index) {
- if (!ReadDataFromGlobal(CV->getOperand(Index), Offset, CurPtr,
+ uint64_t NumElts;
+ if (ArrayType *AT = dyn_cast<ArrayType>(C->getType()))
+ NumElts = AT->getNumElements();
+ else
+ NumElts = cast<VectorType>(C->getType())->getNumElements();
+
+ for (; Index != NumElts; ++Index) {
+ if (!ReadDataFromGlobal(C->getAggregateElement(Index), Offset, CurPtr,
BytesLeft, TD))
return false;
if (EltSize >= BytesLeft)
}
return true;
}
-
- if (ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(C)) {
- uint64_t EltSize = CDS->getElementByteSize();
- uint64_t Index = ByteOffset / EltSize;
- uint64_t Offset = ByteOffset - Index * EltSize;
- for (; Index != CDS->getType()->getNumElements(); ++Index) {
- if (!ReadDataFromGlobal(CDS->getElementAsConstant(Index), Offset, CurPtr,
- BytesLeft, TD))
- return false;
- if (EltSize >= BytesLeft)
- return true;
- Offset = 0;
- BytesLeft -= EltSize;
- CurPtr += EltSize;
- }
- return true;
- }
-
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
if (CE->getOpcode() == Instruction::IntToPtr &&
CE->getOperand(0)->getType() == TD.getIntPtrType(CE->getContext()))
- return ReadDataFromGlobal(CE->getOperand(0), ByteOffset, CurPtr,
- BytesLeft, TD);
+ return ReadDataFromGlobal(CE->getOperand(0), ByteOffset, CurPtr,
+ BytesLeft, TD);
}
// Otherwise, unknown initializer type.
// Instead of loading constant c string, use corresponding integer value
// directly if string length is small enough.
- std::string Str;
- if (TD && GetConstantStringInfo(CE, Str) && !Str.empty()) {
- unsigned StrLen = Str.length();
+ StringRef Str;
+ if (TD && getConstantStringInfo(CE, Str) && !Str.empty()) {
+ unsigned StrLen = Str.size();
Type *Ty = cast<PointerType>(CE->getType())->getElementType();
unsigned NumBits = Ty->getPrimitiveSizeInBits();
// Replace load with immediate integer if the result is an integer or fp
// This makes it easy to determine if the getelementptr is "inbounds".
// Also, this helps GlobalOpt do SROA on GlobalVariables.
Type *Ty = Ptr->getType();
+ assert(Ty->isPointerTy() && "Forming regular GEP of non-pointer type");
SmallVector<Constant*, 32> NewIdxs;
do {
if (SequentialType *ATy = dyn_cast<SequentialType>(Ty)) {
}
Ty = ATy->getElementType();
} else if (StructType *STy = dyn_cast<StructType>(Ty)) {
- // Determine which field of the struct the offset points into. The
- // getZExtValue is at least as safe as the StructLayout API because we
- // know the offset is within the struct at this point.
+ // If we end up with an offset that isn't valid for this struct type, we
+ // can't re-form this GEP in a regular form, so bail out. The pointer
+ // operand likely went through casts that are necessary to make the GEP
+ // sensible.
const StructLayout &SL = *TD->getStructLayout(STy);
+ if (Offset.uge(SL.getSizeInBytes()))
+ break;
+
+ // Determine which field of the struct the offset points into. The
+ // getZExtValue is fine as we've already ensured that the offset is
+ // within the range representable by the StructLayout API.
unsigned ElIdx = SL.getElementContainingOffset(Offset.getZExtValue());
NewIdxs.push_back(ConstantInt::get(Type::getInt32Ty(Ty->getContext()),
ElIdx));
// all operands are constants.
if (isa<UndefValue>(Incoming))
continue;
- // If the incoming value is not a constant, or is a different constant to
- // the one we saw previously, then give up.
+ // If the incoming value is not a constant, then give up.
Constant *C = dyn_cast<Constant>(Incoming);
- if (!C || (CommonValue && C != CommonValue))
+ if (!C)
+ return 0;
+ // Fold the PHI's operands.
+ if (ConstantExpr *NewC = dyn_cast<ConstantExpr>(C))
+ C = ConstantFoldConstantExpression(NewC, TD, TLI);
+ // If the incoming value is a different constant to
+ // the one we saw previously, then give up.
+ if (CommonValue && C != CommonValue)
return 0;
CommonValue = C;
}
+
// If we reach here, all incoming values are the same constant or undef.
return CommonValue ? CommonValue : UndefValue::get(PN->getType());
}
// Scan the operand list, checking to see if they are all constants, if so,
// hand off to ConstantFoldInstOperands.
SmallVector<Constant*, 8> Ops;
- for (User::op_iterator i = I->op_begin(), e = I->op_end(); i != e; ++i)
- if (Constant *Op = dyn_cast<Constant>(*i))
- Ops.push_back(Op);
- else
+ for (User::op_iterator i = I->op_begin(), e = I->op_end(); i != e; ++i) {
+ Constant *Op = dyn_cast<Constant>(*i);
+ if (!Op)
return 0; // All operands not constant!
+ // Fold the Instruction's operands.
+ if (ConstantExpr *NewCE = dyn_cast<ConstantExpr>(Op))
+ Op = ConstantFoldConstantExpression(NewCE, TD, TLI);
+
+ Ops.push_back(Op);
+ }
+
if (const CmpInst *CI = dyn_cast<CmpInst>(I))
return ConstantFoldCompareInstOperands(CI->getPredicate(), Ops[0], Ops[1],
TD, TLI);
switch (Opcode) {
default: return 0;
case Instruction::ICmp:
- case Instruction::FCmp: assert(0 && "Invalid for compares");
+ case Instruction::FCmp: llvm_unreachable("Invalid for compares");
case Instruction::Call:
if (Function *F = dyn_cast<Function>(Ops.back()))
if (canConstantFoldCallTo(F))
ConstantExpr *CE) {
if (!CE->getOperand(1)->isNullValue())
return 0; // Do not allow stepping over the value!
-
- SmallVector<Constant*, 8> Indices(CE->getNumOperands()-2);
- for (unsigned i = 2, e = CE->getNumOperands(); i != e; ++i)
- Indices[i-2] = CE->getOperand(i);
- return ConstantFoldLoadThroughGEPIndices(C, Indices);
+
+ // Loop over all of the operands, tracking down which value we are
+ // addressing.
+ for (unsigned i = 2, e = CE->getNumOperands(); i != e; ++i) {
+ C = C->getAggregateElement(CE->getOperand(i));
+ if (C == 0) return 0;
+ }
+ return C;
}
/// ConstantFoldLoadThroughGEPIndices - Given a constant and getelementptr
// Loop over all of the operands, tracking down which value we are
// addressing.
for (unsigned i = 0, e = Indices.size(); i != e; ++i) {
- ConstantInt *Idx = dyn_cast<ConstantInt>(Indices[i]);
- if (Idx == 0) return 0;
-
- uint64_t IdxVal = Idx->getZExtValue();
-
- if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
- C = CS->getOperand(IdxVal);
- } else if (ConstantAggregateZero *CAZ = dyn_cast<ConstantAggregateZero>(C)){
- C = CAZ->getElementValue(Idx);
- } else if (UndefValue *UV = dyn_cast<UndefValue>(C)) {
- C = UV->getElementValue(Idx);
- } else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
- if (IdxVal >= CA->getType()->getNumElements())
- return 0;
- C = CA->getOperand(IdxVal);
- } else if (ConstantDataSequential *CDS=dyn_cast<ConstantDataSequential>(C)){
- if (IdxVal >= CDS->getType()->getNumElements())
- return 0;
- C = CDS->getElementAsConstant(IdxVal);
- } else if (ConstantVector *CV = dyn_cast<ConstantVector>(C)) {
- if (IdxVal >= CV->getType()->getNumElements())
- return 0;
- C = CV->getOperand(IdxVal);
- } else {
- return 0;
- }
+ C = C->getAggregateElement(Indices[i]);
+ if (C == 0) return 0;
}
return C;
}
/// available for the result. Returns null if the conversion cannot be
/// performed, otherwise returns the Constant value resulting from the
/// conversion.
-static Constant *ConstantFoldConvertToInt(ConstantFP *Op, bool roundTowardZero,
- Type *Ty) {
- assert(Op && "Called with NULL operand");
- APFloat Val(Op->getValueAPF());
-
+static Constant *ConstantFoldConvertToInt(const APFloat &Val,
+ bool roundTowardZero, Type *Ty) {
// All of these conversion intrinsics form an integer of at most 64bits.
unsigned ResultWidth = cast<IntegerType>(Ty)->getBitWidth();
assert(ResultWidth <= 64 &&
}
}
- if (ConstantVector *Op = dyn_cast<ConstantVector>(Operands[0])) {
+ // Support ConstantVector in case we have an Undef in the top.
+ if (isa<ConstantVector>(Operands[0]) ||
+ isa<ConstantDataVector>(Operands[0])) {
+ Constant *Op = cast<Constant>(Operands[0]);
switch (F->getIntrinsicID()) {
default: break;
case Intrinsic::x86_sse_cvtss2si:
case Intrinsic::x86_sse_cvtss2si64:
case Intrinsic::x86_sse2_cvtsd2si:
case Intrinsic::x86_sse2_cvtsd2si64:
- if (ConstantFP *FPOp = dyn_cast<ConstantFP>(Op->getOperand(0)))
- return ConstantFoldConvertToInt(FPOp, /*roundTowardZero=*/false, Ty);
+ if (ConstantFP *FPOp =
+ dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U)))
+ return ConstantFoldConvertToInt(FPOp->getValueAPF(),
+ /*roundTowardZero=*/false, Ty);
case Intrinsic::x86_sse_cvttss2si:
case Intrinsic::x86_sse_cvttss2si64:
case Intrinsic::x86_sse2_cvttsd2si:
case Intrinsic::x86_sse2_cvttsd2si64:
- if (ConstantFP *FPOp = dyn_cast<ConstantFP>(Op->getOperand(0)))
- return ConstantFoldConvertToInt(FPOp, /*roundTowardZero=*/true, Ty);
+ if (ConstantFP *FPOp =
+ dyn_cast_or_null<ConstantFP>(Op->getAggregateElement(0U)))
+ return ConstantFoldConvertToInt(FPOp->getValueAPF(),
+ /*roundTowardZero=*/true, Ty);
}
}
-
+
if (isa<UndefValue>(Operands[0])) {
if (F->getIntrinsicID() == Intrinsic::bswap)
return Operands[0];
APInt Res;
bool Overflow;
switch (F->getIntrinsicID()) {
- default: assert(0 && "Invalid case");
+ default: llvm_unreachable("Invalid case");
case Intrinsic::sadd_with_overflow:
Res = Op1->getValue().sadd_ov(Op2->getValue(), Overflow);
break;
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