LLVM 20.0.0git
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This transformation implements the well known scalar replacement of aggregates transformation. More...
#include "llvm/Transforms/Scalar/SROA.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallBitVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/ADT/iterator.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/DomTreeUpdater.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/Loads.h"
#include "llvm/Analysis/PtrUseVisitor.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/ConstantFolder.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GetElementPtrTypeIterator.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InstVisitor.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Use.h"
#include "llvm/IR/User.h"
#include "llvm/IR/Value.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/PromoteMemToReg.h"
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <iterator>
#include <string>
#include <tuple>
#include <utility>
#include <variant>
#include <vector>
Go to the source code of this file.
Classes | |
class | AllocaSlices::partition_iterator |
An iterator over partitions of the alloca's slices. More... | |
class | AllocaSlices::SliceBuilder |
Builder for the alloca slices. More... | |
Macros | |
#define | DEBUG_TYPE "sroa" |
Functions | |
STATISTIC (NumAllocasAnalyzed, "Number of allocas analyzed for replacement") | |
STATISTIC (NumAllocaPartitions, "Number of alloca partitions formed") | |
STATISTIC (MaxPartitionsPerAlloca, "Maximum number of partitions per alloca") | |
STATISTIC (NumAllocaPartitionUses, "Number of alloca partition uses rewritten") | |
STATISTIC (MaxUsesPerAllocaPartition, "Maximum number of uses of a partition") | |
STATISTIC (NumNewAllocas, "Number of new, smaller allocas introduced") | |
STATISTIC (NumPromoted, "Number of allocas promoted to SSA values") | |
STATISTIC (NumLoadsSpeculated, "Number of loads speculated to allow promotion") | |
STATISTIC (NumLoadsPredicated, "Number of loads rewritten into predicated loads to allow promotion") | |
STATISTIC (NumStoresPredicated, "Number of stores rewritten into predicated loads to allow promotion") | |
STATISTIC (NumDeleted, "Number of instructions deleted") | |
STATISTIC (NumVectorized, "Number of vectorized aggregates") | |
static FragCalcResult | calculateFragment (DILocalVariable *Variable, uint64_t NewStorageSliceOffsetInBits, uint64_t NewStorageSliceSizeInBits, std::optional< DIExpression::FragmentInfo > StorageFragment, std::optional< DIExpression::FragmentInfo > CurrentFragment, DIExpression::FragmentInfo &Target) |
static DebugVariable | getAggregateVariable (DbgVariableIntrinsic *DVI) |
static DebugVariable | getAggregateVariable (DbgVariableRecord *DVR) |
DbgVariableRecord * | UnwrapDbgInstPtr (DbgInstPtr P, DbgVariableRecord *Unused) |
Helpers for handling new and old debug info modes in migrateDebugInfo. | |
DbgAssignIntrinsic * | UnwrapDbgInstPtr (DbgInstPtr P, DbgAssignIntrinsic *Unused) |
static void | migrateDebugInfo (AllocaInst *OldAlloca, bool IsSplit, uint64_t OldAllocaOffsetInBits, uint64_t SliceSizeInBits, Instruction *OldInst, Instruction *Inst, Value *Dest, Value *Value, const DataLayout &DL) |
Find linked dbg.assign and generate a new one with the correct FragmentInfo. | |
static Value * | foldSelectInst (SelectInst &SI) |
static Value * | foldPHINodeOrSelectInst (Instruction &I) |
A helper that folds a PHI node or a select. | |
static std::pair< Type *, IntegerType * > | findCommonType (AllocaSlices::const_iterator B, AllocaSlices::const_iterator E, uint64_t EndOffset) |
Walk the range of a partitioning looking for a common type to cover this sequence of slices. | |
static bool | isSafePHIToSpeculate (PHINode &PN) |
PHI instructions that use an alloca and are subsequently loaded can be rewritten to load both input pointers in the pred blocks and then PHI the results, allowing the load of the alloca to be promoted. | |
static void | speculatePHINodeLoads (IRBuilderTy &IRB, PHINode &PN) |
static SelectHandSpeculativity | isSafeLoadOfSelectToSpeculate (LoadInst &LI, SelectInst &SI, bool PreserveCFG) |
static void | speculateSelectInstLoads (SelectInst &SI, LoadInst &LI, IRBuilderTy &IRB) |
template<typename T > | |
static void | rewriteMemOpOfSelect (SelectInst &SI, T &I, SelectHandSpeculativity Spec, DomTreeUpdater &DTU) |
static void | rewriteMemOpOfSelect (SelectInst &SelInst, Instruction &I, SelectHandSpeculativity Spec, DomTreeUpdater &DTU) |
static bool | rewriteSelectInstMemOps (SelectInst &SI, const RewriteableMemOps &Ops, IRBuilderTy &IRB, DomTreeUpdater *DTU) |
static Value * | getAdjustedPtr (IRBuilderTy &IRB, const DataLayout &DL, Value *Ptr, APInt Offset, Type *PointerTy, const Twine &NamePrefix) |
Compute an adjusted pointer from Ptr by Offset bytes where the resulting pointer has PointerTy. | |
static Align | getAdjustedAlignment (Instruction *I, uint64_t Offset) |
Compute the adjusted alignment for a load or store from an offset. | |
static bool | canConvertValue (const DataLayout &DL, Type *OldTy, Type *NewTy) |
Test whether we can convert a value from the old to the new type. | |
static Value * | convertValue (const DataLayout &DL, IRBuilderTy &IRB, Value *V, Type *NewTy) |
Generic routine to convert an SSA value to a value of a different type. | |
static bool | isVectorPromotionViableForSlice (Partition &P, const Slice &S, VectorType *Ty, uint64_t ElementSize, const DataLayout &DL) |
Test whether the given slice use can be promoted to a vector. | |
static bool | checkVectorTypeForPromotion (Partition &P, VectorType *VTy, const DataLayout &DL) |
Test whether a vector type is viable for promotion. | |
static VectorType * | checkVectorTypesForPromotion (Partition &P, const DataLayout &DL, SmallVectorImpl< VectorType * > &CandidateTys, bool HaveCommonEltTy, Type *CommonEltTy, bool HaveVecPtrTy, bool HaveCommonVecPtrTy, VectorType *CommonVecPtrTy) |
Test whether any vector type in CandidateTys is viable for promotion. | |
static VectorType * | createAndCheckVectorTypesForPromotion (SetVector< Type * > &OtherTys, ArrayRef< VectorType * > CandidateTysCopy, function_ref< void(Type *)> CheckCandidateType, Partition &P, const DataLayout &DL, SmallVectorImpl< VectorType * > &CandidateTys, bool &HaveCommonEltTy, Type *&CommonEltTy, bool &HaveVecPtrTy, bool &HaveCommonVecPtrTy, VectorType *&CommonVecPtrTy) |
static VectorType * | isVectorPromotionViable (Partition &P, const DataLayout &DL) |
Test whether the given alloca partitioning and range of slices can be promoted to a vector. | |
static bool | isIntegerWideningViableForSlice (const Slice &S, uint64_t AllocBeginOffset, Type *AllocaTy, const DataLayout &DL, bool &WholeAllocaOp) |
Test whether a slice of an alloca is valid for integer widening. | |
static bool | isIntegerWideningViable (Partition &P, Type *AllocaTy, const DataLayout &DL) |
Test whether the given alloca partition's integer operations can be widened to promotable ones. | |
static Value * | extractInteger (const DataLayout &DL, IRBuilderTy &IRB, Value *V, IntegerType *Ty, uint64_t Offset, const Twine &Name) |
static Value * | insertInteger (const DataLayout &DL, IRBuilderTy &IRB, Value *Old, Value *V, uint64_t Offset, const Twine &Name) |
static Value * | extractVector (IRBuilderTy &IRB, Value *V, unsigned BeginIndex, unsigned EndIndex, const Twine &Name) |
static Value * | insertVector (IRBuilderTy &IRB, Value *Old, Value *V, unsigned BeginIndex, const Twine &Name) |
static Type * | stripAggregateTypeWrapping (const DataLayout &DL, Type *Ty) |
Strip aggregate type wrapping. | |
static Type * | getTypePartition (const DataLayout &DL, Type *Ty, uint64_t Offset, uint64_t Size) |
Try to find a partition of the aggregate type passed in for a given offset and size. | |
const Value * | getAddress (const DbgVariableIntrinsic *DVI) |
const Value * | getAddress (const DbgVariableRecord *DVR) |
bool | isKillAddress (const DbgVariableIntrinsic *DVI) |
bool | isKillAddress (const DbgVariableRecord *DVR) |
const DIExpression * | getAddressExpression (const DbgVariableIntrinsic *DVI) |
const DIExpression * | getAddressExpression (const DbgVariableRecord *DVR) |
static DIExpression * | createOrReplaceFragment (const DIExpression *Expr, DIExpression::FragmentInfo Frag, int64_t BitExtractOffset) |
Create or replace an existing fragment in a DIExpression with Frag . | |
static void | insertNewDbgInst (DIBuilder &DIB, DbgDeclareInst *Orig, AllocaInst *NewAddr, DIExpression *NewAddrExpr, Instruction *BeforeInst, std::optional< DIExpression::FragmentInfo > NewFragment, int64_t BitExtractAdjustment) |
Insert a new dbg.declare. | |
static void | insertNewDbgInst (DIBuilder &DIB, DbgAssignIntrinsic *Orig, AllocaInst *NewAddr, DIExpression *NewAddrExpr, Instruction *BeforeInst, std::optional< DIExpression::FragmentInfo > NewFragment, int64_t BitExtractAdjustment) |
Insert a new dbg.assign. | |
static void | insertNewDbgInst (DIBuilder &DIB, DbgVariableRecord *Orig, AllocaInst *NewAddr, DIExpression *NewAddrExpr, Instruction *BeforeInst, std::optional< DIExpression::FragmentInfo > NewFragment, int64_t BitExtractAdjustment) |
Insert a new DbgRecord. | |
INITIALIZE_PASS_BEGIN (SROALegacyPass, "sroa", "Scalar Replacement Of Aggregates", false, false) INITIALIZE_PASS_END(SROALegacyPass | |
Variables | |
static cl::opt< bool > | SROASkipMem2Reg ("sroa-skip-mem2reg", cl::init(false), cl::Hidden) |
Disable running mem2reg during SROA in order to test or debug SROA. | |
sroa | |
Scalar Replacement Of | Aggregates |
Scalar Replacement Of | false |
This transformation implements the well known scalar replacement of aggregates transformation.
It tries to identify promotable elements of an aggregate alloca, and promote them to registers. It will also try to convert uses of an element (or set of elements) of an alloca into a vector or bitfield-style integer scalar if appropriate.
It works to do this with minimal slicing of the alloca so that regions which are merely transferred in and out of external memory remain unchanged and are not decomposed to scalar code.
Because this also performs alloca promotion, it can be thought of as also serving the purpose of SSA formation. The algorithm iterates on the function until all opportunities for promotion have been realized.
Definition in file SROA.cpp.
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Definition at line 268 of file SROA.cpp.
References llvm::DIVariable::getSizeInBits(), and Size.
Referenced by migrateDebugInfo().
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Test whether we can convert a value from the old to the new type.
This predicate should be used to guard calls to convertValue in order to ensure that we only try to convert viable values. The strategy is that we will peel off single element struct and array wrappings to get to an underlying value, and convert that value.
Definition at line 1906 of file SROA.cpp.
References assert(), DL, getBitWidth(), llvm::Type::getPointerAddressSpace(), llvm::Type::getScalarType(), llvm::Type::isIntegerTy(), llvm::Type::isPointerTy(), llvm::Type::isSingleValueType(), and llvm::Type::isTargetExtTy().
Referenced by convertValue(), isIntegerWideningViable(), isIntegerWideningViableForSlice(), and isVectorPromotionViableForSlice().
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Test whether a vector type is viable for promotion.
This implements the necessary checking for checkVectorTypesForPromotion
(and thus isVectorPromotionViable) over all slices of the alloca for the given VectorType.
Definition at line 2096 of file SROA.cpp.
References assert(), DL, isVectorPromotionViableForSlice(), and P.
Referenced by checkVectorTypesForPromotion().
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Test whether any vector type in CandidateTys
is viable for promotion.
This implements the necessary checking for isVectorPromotionViable
over all slices of the alloca for the given VectorType.
Definition at line 2125 of file SROA.cpp.
References assert(), checkVectorTypeForPromotion(), llvm::SmallVectorImpl< T >::clear(), DL, llvm::SmallVectorBase< Size_T >::empty(), llvm::erase_if(), P, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::sort(), and llvm::unique().
Referenced by createAndCheckVectorTypesForPromotion().
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Generic routine to convert an SSA value to a value of a different type.
This will try various different casting techniques, such as bitcasts, inttoptr, and ptrtoint casts. Use the canConvertValue
predicate to test two types for viability with this routine.
Definition at line 1968 of file SROA.cpp.
References assert(), canConvertValue(), DL, llvm::Type::getPointerAddressSpace(), llvm::Type::isIntOrIntVectorTy(), and llvm::Type::isPtrOrPtrVectorTy().
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Definition at line 2211 of file SROA.cpp.
References assert(), checkVectorTypesForPromotion(), DL, P, and llvm::ArrayRef< T >::size().
Referenced by isVectorPromotionViable().
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Create or replace an existing fragment in a DIExpression with Frag
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If the expression already contains a DW_OP_LLVM_extract_bits_[sz]ext operation, add BitExtractOffset
to the offset part.
Returns the new expression, or nullptr if this fails (see details below).
This function is similar to DIExpression::createFragmentExpression except for 3 important distinctions:
BitExtractOffset
. A change to the fragment offset or size may affect a bit extract. But a bit extract offset can change independently of the fragment dimensions.Returns the new expression, or nullptr if one couldn't be created. Ideally this is only used to signal that a bit-extract has become zero-sized (and thus the new debug record has no size and can be dropped), however, it fails for other reasons too - see the FIXME below.
FIXME: To keep the change that introduces this function NFC it bails in some situations unecessarily, e.g. when fragment and bit extract sizes differ.
Definition at line 5032 of file SROA.cpp.
References assert(), llvm::dwarf::DW_OP_LLVM_extract_bits_sext, llvm::dwarf::DW_OP_LLVM_extract_bits_zext, llvm::dwarf::DW_OP_LLVM_fragment, llvm::DIExpression::expr_ops(), llvm::MDNode::getContext(), llvm::DbgVariableFragmentInfo::OffsetInBits, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::DbgVariableFragmentInfo::SizeInBits.
Referenced by insertNewDbgInst().
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Definition at line 2470 of file SROA.cpp.
References assert(), llvm::dbgs(), DL, llvm::IntegerType::getBitWidth(), LLVM_DEBUG, Name, and llvm::Offset.
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Definition at line 2528 of file SROA.cpp.
References assert(), llvm::dbgs(), getNumElements(), LLVM_DEBUG, and Name.
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Walk the range of a partitioning looking for a common type to cover this sequence of slices.
Definition at line 1463 of file SROA.cpp.
References B, E, llvm::IntegerType::getBitWidth(), llvm::Value::getType(), and I.
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A helper that folds a PHI node or a select.
Definition at line 1001 of file SROA.cpp.
References foldSelectInst(), and I.
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Definition at line 988 of file SROA.cpp.
Referenced by foldPHINodeOrSelectInst().
const Value * getAddress | ( | const DbgVariableIntrinsic * | DVI | ) |
Definition at line 4973 of file SROA.cpp.
Referenced by llvm::RuntimeDyldELF::finalizeLoad(), llvm::jitlink::MachOLinkGraphBuilder::findSymbolByAddress(), llvm::jitlink::BlockAddressMap::getBlockCovering(), llvm::RuntimeDyldImpl::getSectionContent(), llvm::logicalview::LVBinaryReader::includeInlineeLines(), LLVMGetSymbolAddress(), and llvm::RuntimeDyldImpl::mapSectionAddress().
const Value * getAddress | ( | const DbgVariableRecord * | DVR | ) |
Definition at line 4979 of file SROA.cpp.
References llvm::DbgVariableRecord::getAddress().
const DIExpression * getAddressExpression | ( | const DbgVariableIntrinsic * | DVI | ) |
const DIExpression * getAddressExpression | ( | const DbgVariableRecord * | DVR | ) |
Definition at line 5001 of file SROA.cpp.
References llvm::DbgVariableRecord::getAddressExpression(), llvm::DbgVariableRecord::getExpression(), and llvm::DbgVariableRecord::getType().
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Compute the adjusted alignment for a load or store from an offset.
Definition at line 1896 of file SROA.cpp.
References llvm::commonAlignment(), llvm::getLoadStoreAlignment(), I, and llvm::Offset.
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Compute an adjusted pointer from Ptr by Offset bytes where the resulting pointer has PointerTy.
Definition at line 1885 of file SROA.cpp.
References llvm::Offset, and Ptr.
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Definition at line 314 of file SROA.cpp.
References llvm::Instruction::getDebugLoc(), llvm::DebugLoc::getInlinedAt(), and llvm::DbgVariableIntrinsic::getVariable().
Referenced by migrateDebugInfo().
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Definition at line 318 of file SROA.cpp.
References llvm::DbgRecord::getDebugLoc(), llvm::DebugLoc::getInlinedAt(), and llvm::DbgVariableRecord::getVariable().
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Try to find a partition of the aggregate type passed in for a given offset and size.
This recurses through the aggregate type and tries to compute a subtype based on the offset and size. When the offset and size span a sub-section of an array, it will even compute a new array type for that sub-section, and the same for structs.
Note that this routine is very strict and tries to find a partition of the type which produces the exact right offset and size. It is not forgiving when the size or offset cause either end of type-based partition to be off. Also, this is a best-effort routine. It is reasonable to give up and not return a type if necessary.
Definition at line 4172 of file SROA.cpp.
References assert(), DL, llvm::StructType::element_begin(), llvm::StructType::element_end(), llvm::StructType::get(), llvm::Type::getContext(), llvm::StructLayout::getElementContainingOffset(), llvm::StructLayout::getElementOffset(), llvm::StructType::getElementType(), llvm::StructLayout::getSizeInBits(), llvm::StructLayout::getSizeInBytes(), getSizeInBytes(), getTypePartition(), llvm::StructType::isPacked(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::isScalable(), llvm::Offset, Size, and stripAggregateTypeWrapping().
Referenced by getTypePartition().
INITIALIZE_PASS_BEGIN | ( | SROALegacyPass | , |
"sroa" | , | ||
"Scalar Replacement Of Aggregates" | , | ||
false | , | ||
false | |||
) |
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Definition at line 2495 of file SROA.cpp.
References assert(), llvm::dbgs(), DL, llvm::IntegerType::getBitWidth(), llvm::Value::getType(), LLVM_DEBUG, Name, and llvm::Offset.
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Insert a new dbg.assign.
Orig
Original to copy debug loc, variable, value and value expression from. NewAddr
Location's new base address. NewAddrExpr
New expression to apply to address. BeforeInst
Insert position. NewFragment
New fragment (absolute, non-relative). BitExtractAdjustment
Offset to apply to any extract_bits op.
Definition at line 5119 of file SROA.cpp.
References createOrReplaceFragment(), llvm::dbgs(), llvm::PointerUnion< PTs >::get(), llvm::Value::getContext(), llvm::Instruction::getDebugLoc(), llvm::DIAssignID::getDistinct(), llvm::DbgVariableIntrinsic::getExpression(), llvm::DbgValueInst::getValue(), llvm::DbgVariableIntrinsic::getVariable(), llvm::Instruction::hasMetadata(), llvm::DIBuilder::insertDbgAssign(), LLVM_DEBUG, and llvm::Instruction::setMetadata().
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Insert a new dbg.declare.
Orig
Original to copy debug loc and variable from. NewAddr
Location's new base address. NewAddrExpr
New expression to apply to address. BeforeInst
Insert position. NewFragment
New fragment (absolute, non-relative). BitExtractAdjustment
Offset to apply to any extract_bits op.
Definition at line 5096 of file SROA.cpp.
References createOrReplaceFragment(), llvm::Instruction::getDebugLoc(), and llvm::DbgVariableIntrinsic::getVariable().
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Insert a new DbgRecord.
Orig
Original to copy record type, debug loc and variable from, and additionally value and value expression for dbg_assign records. NewAddr
Location's new base address. NewAddrExpr
New expression to apply to address. BeforeInst
Insert position. NewFragment
New fragment (absolute, non-relative). BitExtractAdjustment
Offset to apply to any extract_bits op.
Definition at line 5159 of file SROA.cpp.
References llvm::DbgVariableRecord::createDbgVariableRecord(), llvm::DbgVariableRecord::createDVRDeclare(), llvm::DbgVariableRecord::createLinkedDVRAssign(), createOrReplaceFragment(), llvm::dbgs(), llvm::Value::getContext(), llvm::DbgRecord::getDebugLoc(), llvm::DIAssignID::getDistinct(), llvm::DbgVariableRecord::getExpression(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::DbgVariableRecord::getValue(), llvm::DbgVariableRecord::getVariable(), llvm::Instruction::hasMetadata(), llvm::DbgVariableRecord::isDbgAssign(), llvm::DbgVariableRecord::isDbgDeclare(), llvm::DbgVariableRecord::isDbgValue(), LLVM_DEBUG, llvm::DbgVariableRecord::setKillAddress(), llvm::Instruction::setMetadata(), and llvm::DIExpression::startsWithDeref().
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Definition at line 2550 of file SROA.cpp.
References assert(), llvm::dbgs(), llvm::ConstantVector::get(), getNumElements(), llvm::Value::getType(), LLVM_DEBUG, Name, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::SmallVectorImpl< T >::reserve().
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Test whether the given alloca partition's integer operations can be widened to promotable ones.
This is a quick test to check whether we can rewrite the integer loads and stores to a particular alloca into wider loads and stores and be able to promote the resulting alloca.
Definition at line 2429 of file SROA.cpp.
References canConvertValue(), DL, llvm::Type::getContext(), llvm::Type::getIntNTy(), isIntegerWideningViableForSlice(), llvm::IntegerType::MAX_INT_BITS, and P.
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Test whether a slice of an alloca is valid for integer widening.
This implements the necessary checking for the isIntegerWideningViable
test below on a single slice of the alloca.
Definition at line 2336 of file SROA.cpp.
References canConvertValue(), DL, llvm::Value::getType(), II, llvm::LoadInst::isVolatile(), MI, and Size.
Referenced by isIntegerWideningViable().
bool isKillAddress | ( | const DbgVariableIntrinsic * | DVI | ) |
bool isKillAddress | ( | const DbgVariableRecord * | DVR | ) |
Definition at line 4989 of file SROA.cpp.
References llvm::DbgVariableRecord::getType(), llvm::DbgVariableRecord::isKillAddress(), and llvm::DbgVariableRecord::isKillLocation().
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Definition at line 1684 of file SROA.cpp.
References assert(), DL, llvm::LoadInst::getAlign(), llvm::Value::getType(), llvm::isSafeToLoadUnconditionally(), llvm::LoadInst::isSimple(), and llvm::PreserveCFG.
PHI instructions that use an alloca and are subsequently loaded can be rewritten to load both input pointers in the pred blocks and then PHI the results, allowing the load of the alloca to be promoted.
From this: P2 = phi [i32* Alloca, i32* Other] V = load i32* P2 to: V1 = load i32* Alloca -> will be mem2reg'd ... V2 = load i32* Other ... V = phi [i32 V1, i32 V2]
We can do this to a select if its only uses are loads and if the operands to the select can be loaded unconditionally.
FIXME: This should be hoisted into a generic utility, likely in Transforms/Util/Local.h
Definition at line 1529 of file SROA.cpp.
References DL, llvm::LoadInst::getAlign(), llvm::Instruction::getDataLayout(), llvm::PHINode::getIncomingBlock(), llvm::PHINode::getIncomingValue(), llvm::PHINode::getNumIncomingValues(), llvm::Instruction::getNumSuccessors(), llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::BasicBlock::getTerminator(), llvm::Value::getType(), Idx, llvm::isSafeToLoadUnconditionally(), llvm::LoadInst::isSimple(), llvm::Instruction::mayHaveSideEffects(), and llvm::Value::users().
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Test whether the given alloca partitioning and range of slices can be promoted to a vector.
This is a quick test to check whether we can rewrite a particular alloca partition (and its newly formed alloca) into a vector alloca with only whole-vector loads and stores such that it could be promoted to a vector SSA value. We only can ensure this for a limited set of operations, and we don't want to do the rewrites unless we are confident that the result will be promotable, so we have an early test here.
Definition at line 2255 of file SROA.cpp.
References llvm::SmallVectorImpl< T >::clear(), createAndCheckVectorTypesForPromotion(), DL, llvm::SmallVectorBase< Size_T >::empty(), llvm::Type::getScalarType(), llvm::Value::getType(), llvm::SetVector< T, Vector, Set, N >::insert(), llvm::Type::isPointerTy(), P, and llvm::SmallVectorTemplateBase< T, bool >::push_back().
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Test whether the given slice use can be promoted to a vector.
This function is called to test each entry in a partition which is slated for a single slice.
Definition at line 2022 of file SROA.cpp.
References assert(), canConvertValue(), DL, llvm::FixedVectorType::get(), llvm::Type::getIntNTy(), getNumElements(), llvm::Value::getType(), II, llvm::Type::isIntegerTy(), llvm::Type::isStructTy(), llvm::LoadInst::isVolatile(), MI, and P.
Referenced by checkVectorTypeForPromotion().
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Find linked dbg.assign and generate a new one with the correct FragmentInfo.
Link Inst to the new dbg.assign. If Value is nullptr the value component is copied from the old dbg.assign to the new.
OldAlloca | Alloca for the variable before splitting. |
IsSplit | True if the store (not necessarily alloca) is being split. |
OldAllocaOffsetInBits | Offset of the slice taken from OldAlloca. |
SliceSizeInBits | New number of bits being written to. |
OldInst | Instruction that is being split. |
Inst | New instruction performing this part of the split store. |
Dest | Store destination. |
Value | Stored value. |
DL | Datalayout. |
Map of aggregate variables to their fragment associated with OldAlloca.
Definition at line 349 of file SROA.cpp.
References assert(), calculateFragment(), llvm::DIExpression::createFragmentExpression(), llvm::dbgs(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::for_each(), getAggregateVariable(), llvm::at::getAssignmentMarkers(), llvm::Value::getContext(), llvm::DIAssignID::getDistinct(), llvm::at::getDVRAssignmentMarkers(), llvm::Instruction::getMetadata(), llvm::Instruction::getModule(), llvm::DIBuilder::insertDbgAssign(), llvm::AllocaInst::isStaticAlloca(), LLVM_DEBUG, llvm::DbgVariableFragmentInfo::OffsetInBits, llvm::Instruction::setMetadata(), llvm::DbgVariableFragmentInfo::SizeInBits, and UnwrapDbgInstPtr().
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Definition at line 1840 of file SROA.cpp.
References I, llvm::llvm_unreachable_internal(), and rewriteMemOpOfSelect().
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Definition at line 1784 of file SROA.cpp.
References llvm::PHINode::addIncoming(), assert(), llvm::PHINode::Create(), llvm::dbgs(), llvm::Value::getName(), llvm::BasicBlock::getTerminator(), I, LLVM_DEBUG, Ptr, llvm::SplitBlockAndInsertIfThen(), llvm::SplitBlockAndInsertIfThenElse(), llvm::successors(), llvm::CallingConv::Tail, and llvm::Value::takeName().
Referenced by rewriteMemOpOfSelect(), and rewriteSelectInstMemOps().
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Definition at line 1851 of file SROA.cpp.
References assert(), llvm::dbgs(), I, LLVM_DEBUG, llvm::make_early_inc_range(), rewriteMemOpOfSelect(), and speculateSelectInstLoads().
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Definition at line 1603 of file SROA.cpp.
References llvm::PHINode::addIncoming(), llvm::dbgs(), llvm::Instruction::eraseFromParent(), llvm::Instruction::getAAMetadata(), llvm::LoadInst::getAlign(), llvm::PHINode::getIncomingBlock(), llvm::PHINode::getIncomingValue(), llvm::Value::getName(), llvm::PHINode::getNumIncomingValues(), llvm::BasicBlock::getTerminator(), llvm::Value::getType(), Idx, LLVM_DEBUG, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::lookup(), llvm::Value::replaceAllUsesWith(), llvm::Value::use_empty(), and llvm::Instruction::user_back().
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Definition at line 1746 of file SROA.cpp.
References assert(), llvm::dbgs(), llvm::Instruction::getAAMetadata(), llvm::LoadInst::getAlign(), llvm::Value::getName(), llvm::Value::getType(), llvm::LoadInst::isSimple(), LLVM_DEBUG, llvm::Value::replaceAllUsesWith(), llvm::Instruction::setAAMetadata(), and llvm::LoadInst::setAlignment().
Referenced by rewriteSelectInstMemOps().
STATISTIC | ( | MaxPartitionsPerAlloca | , |
"Maximum number of partitions per alloca" | |||
) |
STATISTIC | ( | MaxUsesPerAllocaPartition | , |
"Maximum number of uses of a partition" | |||
) |
STATISTIC | ( | NumAllocaPartitions | , |
"Number of alloca partitions formed" | |||
) |
STATISTIC | ( | NumAllocaPartitionUses | , |
"Number of alloca partition uses rewritten" | |||
) |
STATISTIC | ( | NumAllocasAnalyzed | , |
"Number of allocas analyzed for replacement" | |||
) |
STATISTIC | ( | NumDeleted | , |
"Number of instructions deleted" | |||
) |
STATISTIC | ( | NumLoadsPredicated | , |
"Number of loads rewritten into predicated loads to allow promotion" | |||
) |
STATISTIC | ( | NumLoadsSpeculated | , |
"Number of loads speculated to allow promotion" | |||
) |
STATISTIC | ( | NumNewAllocas | , |
"Number of | new, | ||
smaller allocas introduced" | |||
) |
STATISTIC | ( | NumPromoted | , |
"Number of allocas promoted to SSA values" | |||
) |
STATISTIC | ( | NumStoresPredicated | , |
"Number of stores rewritten into predicated loads to allow promotion" | |||
) |
STATISTIC | ( | NumVectorized | , |
"Number of vectorized aggregates" | |||
) |
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Strip aggregate type wrapping.
This removes no-op aggregate types wrapping an underlying type. It will strip as many layers of types as it can without changing either the type size or the allocated size.
Definition at line 4134 of file SROA.cpp.
References DL, llvm::StructLayout::getElementContainingOffset(), llvm::Type::isSingleValueType(), and stripAggregateTypeWrapping().
Referenced by getTypePartition(), and stripAggregateTypeWrapping().
DbgAssignIntrinsic * UnwrapDbgInstPtr | ( | DbgInstPtr | P, |
DbgAssignIntrinsic * | Unused | ||
) |
DbgVariableRecord * UnwrapDbgInstPtr | ( | DbgInstPtr | P, |
DbgVariableRecord * | Unused | ||
) |
Helpers for handling new and old debug info modes in migrateDebugInfo.
These overloads unwrap a DbgInstPtr {Instruction* | DbgRecord*} union based on the Unused
parameter type.
Definition at line 326 of file SROA.cpp.
References P.
Referenced by migrateDebugInfo().