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SelectionDAG.cpp File Reference
#include "llvm/CodeGen/SelectionDAG.h"
#include "SDNodeDbgValue.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/DebugInfo.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetIntrinsicInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetSelectionDAGInfo.h"
#include <algorithm>
#include <cmath>
Include dependency graph for SelectionDAG.cpp:

Go to the source code of this file.

Functions

static SDVTList makeVTList (const EVT *VTs, unsigned NumVTs)
 
static int isSignedOp (ISD::CondCode Opcode)
 
static void AddNodeIDOpcode (FoldingSetNodeID &ID, unsigned OpC)
 
static void AddNodeIDValueTypes (FoldingSetNodeID &ID, SDVTList VTList)
 
static void AddNodeIDOperands (FoldingSetNodeID &ID, const SDValue *Ops, unsigned NumOps)
 
static void AddNodeIDOperands (FoldingSetNodeID &ID, const SDUse *Ops, unsigned NumOps)
 
static void AddNodeIDNode (FoldingSetNodeID &ID, unsigned short OpC, SDVTList VTList, const SDValue *OpList, unsigned N)
 
static void AddNodeIDCustom (FoldingSetNodeID &ID, const SDNode *N)
 
static void AddNodeIDNode (FoldingSetNodeID &ID, const SDNode *N)
 
static unsigned encodeMemSDNodeFlags (int ConvType, ISD::MemIndexedMode AM, bool isVolatile, bool isNonTemporal, bool isInvariant)
 
static bool doNotCSE (SDNode *N)
 doNotCSE - Return true if CSE should not be performed for this node. More...
 
static void VerifyNodeCommon (SDNode *N)
 VerifyNodeCommon - Sanity check the given node. Aborts if it is invalid. More...
 
static void VerifySDNode (SDNode *N)
 VerifySDNode - Sanity check the given SDNode. Aborts if it is invalid. More...
 
static void VerifyMachineNode (SDNode *N)
 
static void commuteShuffle (SDValue &N1, SDValue &N2, SmallVectorImpl< int > &M)
 
static SDValue getMemsetValue (SDValue Value, EVT VT, SelectionDAG &DAG, SDLoc dl)
 
static SDValue getMemsetStringVal (EVT VT, SDLoc dl, SelectionDAG &DAG, const TargetLowering &TLI, StringRef Str)
 
static SDValue getMemBasePlusOffset (SDValue Base, unsigned Offset, SDLoc dl, SelectionDAG &DAG)
 
static bool isMemSrcFromString (SDValue Src, StringRef &Str)
 
static bool FindOptimalMemOpLowering (std::vector< EVT > &MemOps, unsigned Limit, uint64_t Size, unsigned DstAlign, unsigned SrcAlign, bool IsMemset, bool ZeroMemset, bool MemcpyStrSrc, bool AllowOverlap, SelectionDAG &DAG, const TargetLowering &TLI)
 
static SDValue getMemcpyLoadsAndStores (SelectionDAG &DAG, SDLoc dl, SDValue Chain, SDValue Dst, SDValue Src, uint64_t Size, unsigned Align, bool isVol, bool AlwaysInline, MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo)
 
static SDValue getMemmoveLoadsAndStores (SelectionDAG &DAG, SDLoc dl, SDValue Chain, SDValue Dst, SDValue Src, uint64_t Size, unsigned Align, bool isVol, bool AlwaysInline, MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo)
 
static SDValue getMemsetStores (SelectionDAG &DAG, SDLoc dl, SDValue Chain, SDValue Dst, SDValue Src, uint64_t Size, unsigned Align, bool isVol, MachinePointerInfo DstPtrInfo)
 Lower the call to 'memset' intrinsic function into a series of store operations. More...
 
static MachinePointerInfo InferPointerInfo (SDValue Ptr, int64_t Offset=0)
 
static MachinePointerInfo InferPointerInfo (SDValue Ptr, SDValue OffsetOp)
 

Variables

static ManagedStatic< std::set
< EVT, EVT::compareRawBits > > 
EVTs
 
static ManagedStatic< EVTArray > SimpleVTArray
 
static ManagedStatic
< sys::SmartMutex< true > > 
VTMutex
 

Function Documentation

static void AddNodeIDCustom ( FoldingSetNodeID ID,
const SDNode N 
)
static

AddNodeIDCustom - If this is an SDNode with special info, add this info to the NodeID data.

Definition at line 365 of file SelectionDAG.cpp.

References llvm::FoldingSetNodeID::AddInteger(), llvm::FoldingSetNodeID::AddPointer(), llvm::MachineConstantPoolValue::addSelectionDAGCSEId(), llvm::ISD::ATOMIC_CMP_SWAP, llvm::ISD::ATOMIC_LOAD, llvm::ISD::ATOMIC_LOAD_ADD, llvm::ISD::ATOMIC_LOAD_AND, llvm::ISD::ATOMIC_LOAD_MAX, llvm::ISD::ATOMIC_LOAD_MIN, llvm::ISD::ATOMIC_LOAD_NAND, llvm::ISD::ATOMIC_LOAD_OR, llvm::ISD::ATOMIC_LOAD_SUB, llvm::ISD::ATOMIC_LOAD_UMAX, llvm::ISD::ATOMIC_LOAD_UMIN, llvm::ISD::ATOMIC_LOAD_XOR, llvm::ISD::ATOMIC_STORE, llvm::ISD::ATOMIC_SWAP, llvm::ISD::BasicBlock, llvm::ISD::BlockAddress, llvm::ISD::Constant, llvm::ISD::ConstantFP, llvm::ISD::ConstantPool, llvm::ISD::ExternalSymbol, llvm::ISD::FrameIndex, llvm::GlobalAddressSDNode::getAddressSpace(), llvm::MachinePointerInfo::getAddrSpace(), llvm::ConstantPoolSDNode::getAlignment(), llvm::SelectionDAG::getBasicBlock(), llvm::BlockAddressSDNode::getBlockAddress(), llvm::ConstantPoolSDNode::getConstVal(), llvm::GlobalAddressSDNode::getGlobal(), llvm::TargetIndexSDNode::getIndex(), llvm::ConstantPoolSDNode::getMachineCPVal(), llvm::ShuffleVectorSDNode::getMaskElt(), llvm::MemSDNode::getMemoryVT(), llvm::GlobalAddressSDNode::getOffset(), llvm::ConstantPoolSDNode::getOffset(), llvm::TargetIndexSDNode::getOffset(), llvm::BlockAddressSDNode::getOffset(), llvm::SDNode::getOpcode(), llvm::MemSDNode::getPointerInfo(), llvm::EVT::getRawBits(), llvm::MemSDNode::getRawSubclassData(), getReg(), llvm::GlobalAddressSDNode::getTargetFlags(), llvm::ConstantPoolSDNode::getTargetFlags(), llvm::TargetIndexSDNode::getTargetFlags(), llvm::BlockAddressSDNode::getTargetFlags(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::ISD::GlobalAddress, llvm::ISD::GlobalTLSAddress, llvm::ConstantPoolSDNode::isMachineConstantPoolEntry(), llvm::SDNode::isTargetMemoryOpcode(), llvm::ISD::JumpTable, llvm::A64DB::LD, llvm_unreachable, llvm::ISD::LOAD, N, llvm::ISD::PREFETCH, llvm::ISD::Register, llvm::ISD::RegisterMask, llvm::ISD::SRCVALUE, llvm::A64DB::ST, llvm::ISD::STORE, llvm::ISD::TargetBlockAddress, llvm::ISD::TargetConstant, llvm::ISD::TargetConstantFP, llvm::ISD::TargetConstantPool, llvm::ISD::TargetExternalSymbol, llvm::ISD::TargetFrameIndex, llvm::ISD::TargetGlobalAddress, llvm::ISD::TargetGlobalTLSAddress, llvm::ISD::TargetIndex, llvm::ISD::TargetJumpTable, and llvm::ISD::VECTOR_SHUFFLE.

Referenced by AddNodeIDNode().

static void AddNodeIDNode ( FoldingSetNodeID ID,
unsigned short  OpC,
SDVTList  VTList,
const SDValue OpList,
unsigned  N 
)
static
static void AddNodeIDNode ( FoldingSetNodeID ID,
const SDNode N 
)
static

AddNodeIDNode - Generic routine for adding a nodes info to the NodeID data.

Definition at line 494 of file SelectionDAG.cpp.

References AddNodeIDCustom(), AddNodeIDOpcode(), AddNodeIDOperands(), AddNodeIDValueTypes(), llvm::SDNode::getNumOperands(), llvm::SDNode::getOpcode(), llvm::SDNode::getVTList(), and llvm::SDNode::op_begin().

static void AddNodeIDOpcode ( FoldingSetNodeID ID,
unsigned  OpC 
)
static

AddNodeIDOpcode - Add the node opcode to the NodeID data.

Definition at line 325 of file SelectionDAG.cpp.

References llvm::FoldingSetNodeID::AddInteger().

Referenced by AddNodeIDNode().

static void AddNodeIDOperands ( FoldingSetNodeID ID,
const SDValue Ops,
unsigned  NumOps 
)
static

AddNodeIDOperands - Various routines for adding operands to the NodeID data.

Definition at line 337 of file SelectionDAG.cpp.

References llvm::FoldingSetNodeID::AddInteger(), and llvm::FoldingSetNodeID::AddPointer().

Referenced by AddNodeIDNode().

static void AddNodeIDOperands ( FoldingSetNodeID ID,
const SDUse Ops,
unsigned  NumOps 
)
static

AddNodeIDOperands - Various routines for adding operands to the NodeID data.

Definition at line 347 of file SelectionDAG.cpp.

References llvm::FoldingSetNodeID::AddInteger(), llvm::FoldingSetNodeID::AddPointer(), llvm::SDUse::getNode(), and llvm::SDUse::getResNo().

static void AddNodeIDValueTypes ( FoldingSetNodeID ID,
SDVTList  VTList 
)
static

AddNodeIDValueTypes - Value type lists are intern'd so we can represent them solely with their pointer.

Definition at line 331 of file SelectionDAG.cpp.

References llvm::FoldingSetNodeID::AddPointer(), and llvm::SDVTList::VTs.

Referenced by AddNodeIDNode().

static void commuteShuffle ( SDValue N1,
SDValue N2,
SmallVectorImpl< int > &  M 
)
static
static bool doNotCSE ( SDNode N)
static

doNotCSE - Return true if CSE should not be performed for this node.

Definition at line 528 of file SelectionDAG.cpp.

References llvm::ISD::EH_LABEL, llvm::SDNode::getNumValues(), llvm::SDNode::getOpcode(), llvm::SDNode::getValueType(), llvm::MVT::Glue, and llvm::ISD::HANDLENODE.

static unsigned encodeMemSDNodeFlags ( int  ConvType,
ISD::MemIndexedMode  AM,
bool  isVolatile,
bool  isNonTemporal,
bool  isInvariant 
)
inlinestatic

encodeMemSDNodeFlags - Generic routine for computing a value for use in the CSE map that carries volatility, temporalness, indexing mode, and extension/truncation information.

Definition at line 510 of file SelectionDAG.cpp.

Referenced by llvm::SelectionDAG::getLoad(), llvm::SelectionDAG::getStore(), llvm::SelectionDAG::getTruncStore(), and llvm::MemSDNode::MemSDNode().

static bool FindOptimalMemOpLowering ( std::vector< EVT > &  MemOps,
unsigned  Limit,
uint64_t  Size,
unsigned  DstAlign,
unsigned  SrcAlign,
bool  IsMemset,
bool  ZeroMemset,
bool  MemcpyStrSrc,
bool  AllowOverlap,
SelectionDAG DAG,
const TargetLowering TLI 
)
static
static SDValue getMemBasePlusOffset ( SDValue  Base,
unsigned  Offset,
SDLoc  dl,
SelectionDAG DAG 
)
static

getMemBasePlusOffset - Returns base and offset node for the

Definition at line 3559 of file SelectionDAG.cpp.

References llvm::ISD::ADD, llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getNode(), and llvm::SDValue::getValueType().

Referenced by getMemcpyLoadsAndStores(), getMemmoveLoadsAndStores(), and getMemsetStores().

static SDValue getMemcpyLoadsAndStores ( SelectionDAG DAG,
SDLoc  dl,
SDValue  Chain,
SDValue  Dst,
SDValue  Src,
uint64_t  Size,
unsigned  Align,
bool  isVol,
bool  AlwaysInline,
MachinePointerInfo  DstPtrInfo,
MachinePointerInfo  SrcPtrInfo 
)
static

Definition at line 3690 of file SelectionDAG.cpp.

References Align(), llvm::EVT::bitsGE(), llvm::dyn_cast(), llvm::StringRef::empty(), llvm::DataLayout::exceedsNaturalStackAlignment(), llvm::ISD::EXTLOAD, FindOptimalMemOpLowering(), llvm::DataLayout::getABITypeAlignment(), llvm::Function::getAttributes(), llvm::SelectionDAG::getContext(), llvm::TargetLoweringBase::getDataLayout(), llvm::SelectionDAG::getExtLoad(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::FrameIndexSDNode::getIndex(), llvm::SelectionDAG::getMachineFunction(), llvm::TargetLoweringBase::getMaxStoresPerMemcpy(), getMemBasePlusOffset(), getMemsetStringVal(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::MachineFrameInfo::getObjectAlignment(), llvm::SDValue::getOpcode(), llvm::TargetMachine::getRegisterInfo(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getStore(), llvm::MachineFunction::getTarget(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getTruncStore(), llvm::TargetLoweringBase::getTypeToTransformTo(), llvm::MachinePointerInfo::getWithOffset(), llvm::SelectionDAG::InferPtrAlignment(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::EVT::isInteger(), isMemSrcFromString(), llvm::EVT::isVector(), llvm::MinAlign(), llvm::TargetRegisterInfo::needsStackRealignment(), llvm::Attribute::OptimizeForSize, llvm::MVT::Other, llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), llvm::MachineFrameInfo::setObjectAlignment(), llvm::SmallVectorTemplateCommon< T, typename >::size(), llvm::SmallVectorTemplateCommon< T >::size(), llvm::SPII::Store, llvm::StringRef::substr(), llvm::ISD::TokenFactor, and llvm::ISD::UNDEF.

Referenced by llvm::SelectionDAG::getMemcpy().

static SDValue getMemmoveLoadsAndStores ( SelectionDAG DAG,
SDLoc  dl,
SDValue  Chain,
SDValue  Dst,
SDValue  Src,
uint64_t  Size,
unsigned  Align,
bool  isVol,
bool  AlwaysInline,
MachinePointerInfo  DstPtrInfo,
MachinePointerInfo  SrcPtrInfo 
)
static
static SDValue getMemsetStores ( SelectionDAG DAG,
SDLoc  dl,
SDValue  Chain,
SDValue  Dst,
SDValue  Src,
uint64_t  Size,
unsigned  Align,
bool  isVol,
MachinePointerInfo  DstPtrInfo 
)
static

Lower the call to 'memset' intrinsic function into a series of store operations.

Parameters
DAGSelection DAG where lowered code is placed.
dlLink to corresponding IR location.
ChainControl flow dependency.
DstPointer to destination memory location.
SrcValue of byte to write into the memory.
SizeNumber of bytes to write.
AlignAlignment of the destination in bytes.
isVolTrue if destination is volatile.
DstPtrInfoIR information on the memory pointer.
Returns
New head in the control flow, if lowering was successful, empty SDValue otherwise.

The function tries to replace 'llvm.memset' intrinsic with several store operations and value calculation code. This is usually profitable for small memory size.

Definition at line 3907 of file SelectionDAG.cpp.

References Align(), llvm::EVT::bitsLT(), llvm::dyn_cast(), FindOptimalMemOpLowering(), llvm::DataLayout::getABITypeAlignment(), llvm::Function::getAttributes(), llvm::SelectionDAG::getContext(), llvm::TargetLoweringBase::getDataLayout(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::FrameIndexSDNode::getIndex(), llvm::SelectionDAG::getMachineFunction(), llvm::TargetLoweringBase::getMaxStoresPerMemset(), getMemBasePlusOffset(), getMemsetValue(), llvm::SelectionDAG::getNode(), llvm::MachineFrameInfo::getObjectAlignment(), llvm::SDValue::getOpcode(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getStore(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SDValue::getValueType(), llvm::MachinePointerInfo::getWithOffset(), llvm::MachineFrameInfo::isFixedObjectIndex(), llvm::TargetLoweringBase::isTruncateFree(), llvm::EVT::isVector(), llvm::Attribute::OptimizeForSize, llvm::MVT::Other, llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), llvm::MachineFrameInfo::setObjectAlignment(), llvm::SmallVectorTemplateCommon< T >::size(), llvm::SmallVectorTemplateCommon< T, typename >::size(), llvm::SPII::Store, llvm::ISD::TokenFactor, llvm::ISD::TRUNCATE, and llvm::ISD::UNDEF.

Referenced by llvm::SelectionDAG::getMemset().

static SDValue getMemsetStringVal ( EVT  VT,
SDLoc  dl,
SelectionDAG DAG,
const TargetLowering TLI,
StringRef  Str 
)
static
static SDValue getMemsetValue ( SDValue  Value,
EVT  VT,
SelectionDAG DAG,
SDLoc  dl 
)
static
static MachinePointerInfo InferPointerInfo ( SDValue  Ptr,
int64_t  Offset = 0 
)
static

InferPointerInfo - If the specified ptr/offset is a frame index, infer a MachinePointerInfo record from it. This is particularly useful because the code generator has many cases where it doesn't bother passing in a MachinePointerInfo to getLoad or getStore when it has "FI+Cst".

Definition at line 4453 of file SelectionDAG.cpp.

References llvm::ISD::ADD, llvm::MachinePointerInfo::getFixedStack(), llvm::SDValue::getOpcode(), and llvm::SDValue::getOperand().

Referenced by llvm::SelectionDAG::getLoad(), llvm::SelectionDAG::getStore(), llvm::SelectionDAG::getTruncStore(), and InferPointerInfo().

static MachinePointerInfo InferPointerInfo ( SDValue  Ptr,
SDValue  OffsetOp 
)
static

InferPointerInfo - If the specified ptr/offset is a frame index, infer a MachinePointerInfo record from it. This is particularly useful because the code generator has many cases where it doesn't bother passing in a MachinePointerInfo to getLoad or getStore when it has "FI+Cst".

Definition at line 4473 of file SelectionDAG.cpp.

References llvm::SDValue::getOpcode(), InferPointerInfo(), and llvm::ISD::UNDEF.

static bool isMemSrcFromString ( SDValue  Src,
StringRef Str 
)
static

isMemSrcFromString - Returns true if memcpy source is a string constant.

Definition at line 3568 of file SelectionDAG.cpp.

References llvm::ISD::ADD, llvm::ISD::Constant, G, llvm::getConstantStringInfo(), llvm::GlobalAddressSDNode::getGlobal(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), and llvm::ISD::GlobalAddress.

Referenced by getMemcpyLoadsAndStores().

static int isSignedOp ( ISD::CondCode  Opcode)
static

isSignedOp - For an integer comparison, return 1 if the comparison is a signed operation and 2 if the result is an unsigned comparison. Return zero if the operation does not depend on the sign of the input (setne and seteq).

Definition at line 251 of file SelectionDAG.cpp.

References llvm_unreachable, llvm::ISD::SETEQ, llvm::ISD::SETGE, llvm::ISD::SETGT, llvm::ISD::SETLE, llvm::ISD::SETLT, llvm::ISD::SETNE, llvm::ISD::SETUGE, llvm::ISD::SETUGT, llvm::ISD::SETULE, and llvm::ISD::SETULT.

Referenced by llvm::ISD::getSetCCAndOperation(), and llvm::ISD::getSetCCOrOperation().

static SDVTList makeVTList ( const EVT VTs,
unsigned  NumVTs 
)
static

makeVTList - Return an instance of the SDVTList struct initialized with the specified members.

Definition at line 57 of file SelectionDAG.cpp.

Referenced by llvm::SelectionDAG::getMemIntrinsicNode(), llvm::SelectionDAG::getNode(), and llvm::SelectionDAG::getVTList().

static void VerifyMachineNode ( SDNode N)
static

VerifyMachineNode - Sanity check the given MachineNode. Aborts if it is invalid.

Definition at line 850 of file SelectionDAG.cpp.

References VerifyNodeCommon().

Referenced by llvm::SelectionDAG::getMachineNode().

static void VerifyNodeCommon ( SDNode N)
static
static void VerifySDNode ( SDNode N)
static

VerifySDNode - Sanity check the given SDNode. Aborts if it is invalid.

Definition at line 822 of file SelectionDAG.cpp.

References VerifyNodeCommon().

Referenced by llvm::SelectionDAG::getNode().

Variable Documentation

ManagedStatic<std::set<EVT, EVT::compareRawBits> > EVTs
static

Definition at line 6099 of file SelectionDAG.cpp.

ManagedStatic<EVTArray> SimpleVTArray
static

Definition at line 6100 of file SelectionDAG.cpp.

ManagedStatic<sys::SmartMutex<true> > VTMutex
static

Definition at line 6101 of file SelectionDAG.cpp.