/// @note This has to exist, because this is a pass, but it should never be
/// used.
TargetData::TargetData() : ImmutablePass(&ID) {
- llvm_report_error("Bad TargetData ctor used. "
+ report_fatal_error("Bad TargetData ctor used. "
"Tool did not specify a TargetData to use?");
}
return ABIInfo ? Alignments[i].ABIAlign : Alignments[i].PrefAlign;
// The best match so far depends on what we're looking for.
- if (AlignType == VECTOR_ALIGN && Alignments[i].AlignType == VECTOR_ALIGN) {
- // If this is a specification for a smaller vector type, we will fall back
- // to it. This happens because <128 x double> can be implemented in terms
- // of 64 <2 x double>.
- if (Alignments[i].TypeBitWidth < BitWidth) {
- // Verify that we pick the biggest of the fallbacks.
- if (BestMatchIdx == -1 ||
- Alignments[BestMatchIdx].TypeBitWidth < Alignments[i].TypeBitWidth)
- BestMatchIdx = i;
- }
- } else if (AlignType == INTEGER_ALIGN &&
- Alignments[i].AlignType == INTEGER_ALIGN) {
+ if (AlignType == INTEGER_ALIGN &&
+ Alignments[i].AlignType == INTEGER_ALIGN) {
// The "best match" for integers is the smallest size that is larger than
// the BitWidth requested.
if (Alignments[i].TypeBitWidth > BitWidth && (BestMatchIdx == -1 ||
} else {
assert(AlignType == VECTOR_ALIGN && "Unknown alignment type!");
- // If we didn't find a vector size that is smaller or equal to this type,
- // then we will end up scalarizing this to its element type. Just return
- // the alignment of the element.
- return getAlignment(cast<VectorType>(Ty)->getElementType(), ABIInfo);
+ // By default, use natural alignment for vector types. This is consistent
+ // with what clang and llvm-gcc do.
+ unsigned Align = getTypeAllocSize(cast<VectorType>(Ty)->getElementType());
+ Align *= cast<VectorType>(Ty)->getNumElements();
+ // If the alignment is not a power of 2, round up to the next power of 2.
+ // This happens for non-power-of-2 length vectors.
+ if (Align & (Align-1))
+ Align = llvm::NextPowerOf2(Align);
+ return Align;
}
}
return getPointerSizeInBits();
case Type::ArrayTyID: {
const ArrayType *ATy = cast<ArrayType>(Ty);
- return getTypeSizeInBits(ATy->getElementType())*ATy->getNumElements();
+ return getTypeAllocSizeInBits(ATy->getElementType())*ATy->getNumElements();
}
case Type::StructTyID:
// Get the layout annotation... which is lazily created on demand.
return getStructLayout(cast<StructType>(Ty))->getSizeInBits();
+ case Type::UnionTyID: {
+ const UnionType *UnTy = cast<UnionType>(Ty);
+ uint64_t Size = 0;
+ for (UnionType::element_iterator i = UnTy->element_begin(),
+ e = UnTy->element_end(); i != e; ++i) {
+ Size = std::max(Size, getTypeSizeInBits(*i));
+ }
+ return Size;
+ }
case Type::IntegerTyID:
return cast<IntegerType>(Ty)->getBitWidth();
case Type::VoidTyID:
return 0;
}
-/// getTypeStoreSize - Return the maximum number of bytes that may be
-/// overwritten by storing the specified type. For example, returns 5
-/// for i36 and 10 for x86_fp80.
-uint64_t TargetData::getTypeStoreSize(const Type *Ty) const {
- // Arrays and vectors are allocated as sequences of elements.
- if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
- if (ATy->getNumElements() == 0)
- return 0;
- const Type *ElementType = ATy->getElementType();
- return getTypeAllocSize(ElementType) * (ATy->getNumElements() - 1) +
- getTypeStoreSize(ElementType);
- }
- if (const VectorType *VTy = dyn_cast<VectorType>(Ty)) {
- const Type *ElementType = VTy->getElementType();
- return getTypeAllocSize(ElementType) * (VTy->getNumElements() - 1) +
- getTypeStoreSize(ElementType);
- }
-
- return (getTypeSizeInBits(Ty)+7)/8;
-}
-
-/// getTypeAllocSize - Return the offset in bytes between successive objects
-/// of the specified type, including alignment padding. This is the amount
-/// that alloca reserves for this type. For example, returns 12 or 16 for
-/// x86_fp80, depending on alignment.
-uint64_t TargetData::getTypeAllocSize(const Type* Ty) const {
- // Arrays and vectors are allocated as sequences of elements.
- // Note that this means that things like vectors-of-i1 are not bit-packed
- // in memory (except on a hypothetical bit-addressable machine). If
- // someone builds hardware with native vector-of-i1 stores and the idiom
- // of bitcasting vectors to integers in order to bitpack them for storage
- // isn't sufficient, TargetData may need new "size" concept.
- if (const ArrayType *ATy = dyn_cast<ArrayType>(Ty))
- return getTypeAllocSize(ATy->getElementType()) * ATy->getNumElements();
- if (const VectorType *VTy = dyn_cast<VectorType>(Ty))
- return getTypeAllocSize(VTy->getElementType()) * VTy->getNumElements();
-
- // Round up to the next alignment boundary.
- return RoundUpAlignment(getTypeStoreSize(Ty), getABITypeAlignment(Ty));
-}
-
/*!
\param abi_or_pref Flag that determines which alignment is returned. true
returns the ABI alignment, false returns the preferred alignment.
unsigned Align = getAlignmentInfo(AGGREGATE_ALIGN, 0, abi_or_pref, Ty);
return std::max(Align, (unsigned)Layout->getAlignment());
}
+ case Type::UnionTyID: {
+ const UnionType *UnTy = cast<UnionType>(Ty);
+ unsigned Align = 1;
+
+ // Unions need the maximum alignment of all their entries
+ for (UnionType::element_iterator i = UnTy->element_begin(),
+ e = UnTy->element_end(); i != e; ++i) {
+ Align = std::max(Align, (unsigned)getAlignment(*i, abi_or_pref));
+ }
+ return Align;
+ }
case Type::IntegerTyID:
case Type::VoidTyID:
AlignType = INTEGER_ALIGN;
// Update Ty to refer to current element
Ty = STy->getElementType(FieldNo);
+ } else if (const UnionType *UnTy = dyn_cast<UnionType>(*TI)) {
+ unsigned FieldNo = cast<ConstantInt>(Indices[CurIDX])->getZExtValue();
+
+ // Offset into union is canonically 0, but type changes
+ Ty = UnTy->getElementType(FieldNo);
} else {
// Update Ty to refer to current element
Ty = cast<SequentialType>(Ty)->getElementType();
// Get the array index and the size of each array element.
- int64_t arrayIdx = cast<ConstantInt>(Indices[CurIDX])->getSExtValue();
- Result += arrayIdx * (int64_t)getTypeAllocSize(Ty);
+ if (int64_t arrayIdx = cast<ConstantInt>(Indices[CurIDX])->getSExtValue())
+ Result += arrayIdx * (int64_t)getTypeAllocSize(Ty);
}
}
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