SelectionDAGISel.cpp File Reference

#include "llvm/CodeGen/SelectionDAGISel.h"
#include "ScheduleDAGSDNodes.h"
#include "SelectionDAGBuilder.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/EHPersonalities.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/FastISel.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/GCMetadata.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachinePassRegistry.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SchedulerRegistry.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/StackProtector.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/User.h"
#include "llvm/IR/Value.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Pass.h"
#include "llvm/Support/BranchProbability.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/KnownBits.h"
#include "llvm/Support/MachineValueType.h"
#include "llvm/Support/Timer.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetIntrinsicInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <iterator>
#include <limits>
#include <memory>
#include <string>
#include <utility>
#include <vector>

Go to the source code of this file.

Classes
class	llvm::OptLevelChanger
	This class is used by SelectionDAGISel to temporarily override the optimization level on a per-function basis. More...

Namespaces
	llvm
	This class represents lattice values for constants.

Macros
#define	DEBUG_TYPE   "isel"

Functions
	STATISTIC (NumFastIselFailures, "Number of instructions fast isel failed on")
	STATISTIC (NumFastIselSuccess, "Number of instructions fast isel selected")
	STATISTIC (NumFastIselBlocks, "Number of blocks selected entirely by fast isel")
	STATISTIC (NumDAGBlocks, "Number of blocks selected using DAG")
	STATISTIC (NumDAGIselRetries,"Number of times dag isel has to try another path")
	STATISTIC (NumEntryBlocks, "Number of entry blocks encountered")
	STATISTIC (NumFastIselFailLowerArguments, "Number of entry blocks where fast isel failed to lower arguments")
ScheduleDAGSDNodes *	llvm::createDefaultScheduler (SelectionDAGISel *IS, CodeGenOpt::Level OptLevel)
	createDefaultScheduler - This creates an instruction scheduler appropriate for the target. More...
static void	SplitCriticalSideEffectEdges (Function &Fn, DominatorTree *DT, LoopInfo *LI)
	SplitCriticalSideEffectEdges - Look for critical edges with a PHI value that may trap on it. More...
static void	reportFastISelFailure (MachineFunction &MF, OptimizationRemarkEmitter &ORE, OptimizationRemarkMissed &R, bool ShouldAbort)
static bool	hasExceptionPointerOrCodeUser (const CatchPadInst *CPI)
static void	mapWasmLandingPadIndex (MachineBasicBlock *MBB, const CatchPadInst *CPI)
static bool	isFoldedOrDeadInstruction (const Instruction *I, FunctionLoweringInfo *FuncInfo)
	isFoldedOrDeadInstruction - Return true if the specified instruction is side-effect free and is either dead or folded into a generated instruction. More...
static void	setupSwiftErrorVals (const Function &Fn, const TargetLowering *TLI, FunctionLoweringInfo *FuncInfo)
	Set up SwiftErrorVals by going through the function. More...
static void	createSwiftErrorEntriesInEntryBlock (FunctionLoweringInfo *FuncInfo, FastISel *FastIS, const TargetLowering *TLI, const TargetInstrInfo *TII, SelectionDAGBuilder *SDB)
static void	processDbgDeclares (FunctionLoweringInfo *FuncInfo)
	Collect llvm.dbg.declare information. More...
static void	propagateSwiftErrorVRegs (FunctionLoweringInfo *FuncInfo)
	Propagate swifterror values through the machine function CFG. More...
static void	preassignSwiftErrorRegs (const TargetLowering *TLI, FunctionLoweringInfo *FuncInfo, BasicBlock::const_iterator Begin, BasicBlock::const_iterator End)
static bool	MIIsInTerminatorSequence (const MachineInstr &MI)
	Given that the input MI is before a partial terminator sequence TSeq, return true if M + TSeq also a partial terminator sequence. More...
static MachineBasicBlock::iterator	FindSplitPointForStackProtector (MachineBasicBlock *BB)
	Find the split point at which to splice the end of BB into its success stack protector check machine basic block. More...
static SDNode *	findGlueUse (SDNode *N)
	findGlueUse - Return use of MVT::Glue value produced by the specified SDNode. More...
static bool	findNonImmUse (SDNode *Root, SDNode *Def, SDNode *ImmedUse, bool IgnoreChains)
	findNonImmUse - Return true if "Def" is a predecessor of "Root" via a path beyond "ImmedUse". More...
static LLVM_ATTRIBUTE_ALWAYS_INLINE uint64_t	GetVBR (uint64_t Val, const unsigned char *MatcherTable, unsigned &Idx)
	GetVBR - decode a vbr encoding whose top bit is set. More...
static SDValue	HandleMergeInputChains (SmallVectorImpl< SDNode *> &ChainNodesMatched, SelectionDAG *CurDAG)
	HandleMergeInputChains - This implements the OPC_EmitMergeInputChains operation for when the pattern matched at least one node with a chains. More...
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckSame (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, const SmallVectorImpl< std::pair< SDValue, SDNode *>> &RecordedNodes)
	CheckSame - Implements OP_CheckSame. More...
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckChildSame (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, const SmallVectorImpl< std::pair< SDValue, SDNode *>> &RecordedNodes, unsigned ChildNo)
	CheckChildSame - Implements OP_CheckChildXSame. More...
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckPatternPredicate (const unsigned char *MatcherTable, unsigned &MatcherIndex, const SelectionDAGISel &SDISel)
	CheckPatternPredicate - Implements OP_CheckPatternPredicate. More...
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckNodePredicate (const unsigned char *MatcherTable, unsigned &MatcherIndex, const SelectionDAGISel &SDISel, SDNode *N)
	CheckNodePredicate - Implements OP_CheckNodePredicate. More...
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckOpcode (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDNode *N)
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckType (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, const TargetLowering *TLI, const DataLayout &DL)
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckChildType (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, const TargetLowering *TLI, const DataLayout &DL, unsigned ChildNo)
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckCondCode (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N)
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckValueType (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, const TargetLowering *TLI, const DataLayout &DL)
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckInteger (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N)
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckChildInteger (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, unsigned ChildNo)
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckAndImm (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, const SelectionDAGISel &SDISel)
static LLVM_ATTRIBUTE_ALWAYS_INLINE bool	CheckOrImm (const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, const SelectionDAGISel &SDISel)
static unsigned	IsPredicateKnownToFail (const unsigned char *Table, unsigned Index, SDValue N, bool &Result, const SelectionDAGISel &SDISel, SmallVectorImpl< std::pair< SDValue, SDNode *>> &RecordedNodes)
	IsPredicateKnownToFail - If we know how and can do so without pushing a scope, evaluate the current node. More...

Variables
static cl::opt< int >	EnableFastISelAbort ("fast-isel-abort", cl::Hidden, cl::desc("Enable abort calls when \ast\instruction selection " "fails to lower an instruction: 0 disable the abort, 1 will " "abort but for args, calls and terminators, 2 will also " "abort for argument lowering, and 3 will never fallback " "to SelectionDAG."))
static cl::opt< bool >	EnableFastISelFallbackReport ("fast-isel-report-on-fallback", cl::Hidden, cl::desc("Emit a diagnostic when \ast\instruction selection " "falls back to SelectionDAG."))
static cl::opt< bool >	UseMBPI ("use-mbpi", cl::desc("use Machine Branch Probability Info"), cl::init(true), cl::Hidden)
static cl::opt< std::string >	FilterDAGBasicBlockName ("filter-view-dags", cl::Hidden, cl::desc("Only display the basic block whose name " "matches this for all view-*-dags options"))
static cl::opt< bool >	ViewDAGCombine1 ("view-dag-combine1-dags", cl::Hidden, cl::desc("Pop up a window to show dags before the first " "dag combine pass"))
static cl::opt< bool >	ViewLegalizeTypesDAGs ("view-legalize-types-dags", cl::Hidden, cl::desc("Pop up a window to show dags before legalize types"))
static cl::opt< bool >	ViewLegalizeDAGs ("view-legalize-dags", cl::Hidden, cl::desc("Pop up a window to show dags before legalize"))
static cl::opt< bool >	ViewDAGCombine2 ("view-dag-combine2-dags", cl::Hidden, cl::desc("Pop up a window to show dags before the second " "dag combine pass"))
static cl::opt< bool >	ViewDAGCombineLT ("view-dag-combine-lt-dags", cl::Hidden, cl::desc("Pop up a window to show dags before the post legalize types" " dag combine pass"))
static cl::opt< bool >	ViewISelDAGs ("view-isel-dags", cl::Hidden, cl::desc("Pop up a window to show isel dags as they are selected"))
static cl::opt< bool >	ViewSchedDAGs ("view-sched-dags", cl::Hidden, cl::desc("Pop up a window to show sched dags as they are processed"))
static cl::opt< bool >	ViewSUnitDAGs ("view-sunit-dags", cl::Hidden, cl::desc("Pop up a window to show SUnit dags after they are processed"))
static cl::opt< RegisterScheduler::FunctionPassCtor, false, RegisterPassParser< RegisterScheduler > >	ISHeuristic ("pre-RA-sched", cl::init(&createDefaultScheduler), cl::Hidden, cl::desc("Instruction schedulers available (before register" " allocation):"))
	ISHeuristic command line option for instruction schedulers. More...
static RegisterScheduler	defaultListDAGScheduler ("default", "Best scheduler for the target", createDefaultScheduler)

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "isel"

Definition at line 105 of file SelectionDAGISel.cpp.

Function Documentation

CheckAndImm()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckAndImm ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N, const SelectionDAGISel &  SDISel  )

inlinestatic

Definition at line 2761 of file SelectionDAGISel.cpp.

References llvm::ISD::AND, C, llvm::SelectionDAGISel::CheckAndMask(), llvm::dyn_cast(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), GetVBR(), and LLVM_ATTRIBUTE_ALWAYS_INLINE.

Referenced by IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckChildInteger()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckChildInteger ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N, unsigned  ChildNo  )

inlinestatic

Definition at line 2753 of file SelectionDAGISel.cpp.

References CheckInteger(), llvm::SDValue::getNumOperands(), llvm::SDValue::getOperand(), and LLVM_ATTRIBUTE_ALWAYS_INLINE.

Referenced by IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckChildSame()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckChildSame ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N, const SmallVectorImpl< std::pair< SDValue, SDNode *>> &  RecordedNodes, unsigned  ChildNo  )

inlinestatic

CheckChildSame - Implements OP_CheckChildXSame.

Definition at line 2671 of file SelectionDAGISel.cpp.

References CheckSame(), llvm::SDValue::getNumOperands(), llvm::SDValue::getOperand(), and LLVM_ATTRIBUTE_ALWAYS_INLINE.

Referenced by IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckChildType()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckChildType ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N, const TargetLowering *  TLI, const DataLayout &  DL, unsigned  ChildNo  )

inlinestatic

Definition at line 2714 of file SelectionDAGISel.cpp.

References CheckType(), llvm::SDValue::getNumOperands(), llvm::SDValue::getOperand(), LLVM_ATTRIBUTE_ALWAYS_INLINE, and llvm::SelectionDAGISel::TLI.

Referenced by IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckCondCode()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckCondCode ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N  )

inlinestatic

Definition at line 2724 of file SelectionDAGISel.cpp.

References LLVM_ATTRIBUTE_ALWAYS_INLINE, and N.

Referenced by IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckInteger()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckInteger ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N  )

inlinestatic

Definition at line 2742 of file SelectionDAGISel.cpp.

References C, llvm::dyn_cast(), llvm::ConstantSDNode::getSExtValue(), GetVBR(), LLVM_ATTRIBUTE_ALWAYS_INLINE, and N.

Referenced by CheckChildInteger(), IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckNodePredicate()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckNodePredicate ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, const SelectionDAGISel &  SDISel, SDNode *  N  )

inlinestatic

CheckNodePredicate - Implements OP_CheckNodePredicate.

Definition at line 2690 of file SelectionDAGISel.cpp.

References llvm::SelectionDAGISel::CheckNodePredicate(), and LLVM_ATTRIBUTE_ALWAYS_INLINE.

CheckOpcode()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckOpcode ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDNode *  N  )

inlinestatic

Definition at line 2696 of file SelectionDAGISel.cpp.

References llvm::SDNode::getOpcode(), and LLVM_ATTRIBUTE_ALWAYS_INLINE.

Referenced by IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckOrImm()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckOrImm ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N, const SelectionDAGISel &  SDISel  )

inlinestatic

Definition at line 2774 of file SelectionDAGISel.cpp.

References C, llvm::SelectionDAGISel::CheckOrMask(), llvm::dyn_cast(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), GetVBR(), and llvm::ISD::OR.

Referenced by IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckPatternPredicate()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckPatternPredicate ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, const SelectionDAGISel &  SDISel  )

inlinestatic

CheckPatternPredicate - Implements OP_CheckPatternPredicate.

Definition at line 2683 of file SelectionDAGISel.cpp.

References llvm::SelectionDAGISel::CheckPatternPredicate(), and LLVM_ATTRIBUTE_ALWAYS_INLINE.

CheckSame()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckSame ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N, const SmallVectorImpl< std::pair< SDValue, SDNode *>> &  RecordedNodes  )

inlinestatic

CheckSame - Implements OP_CheckSame.

Definition at line 2660 of file SelectionDAGISel.cpp.

References assert(), and LLVM_ATTRIBUTE_ALWAYS_INLINE.

Referenced by llvm::FileCheckString::Check(), CheckChildSame(), llvm::FileCheckString::FileCheckString(), IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckType()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckType ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N, const TargetLowering *  TLI, const DataLayout &  DL  )

inlinestatic

Definition at line 2704 of file SelectionDAGISel.cpp.

References llvm::TargetLoweringBase::getPointerTy(), llvm::SDValue::getValueType(), llvm::MVT::iPTR, and LLVM_ATTRIBUTE_ALWAYS_INLINE.

Referenced by CheckChildType(), llvm::IsAOpInit::classof(), llvm::IsAOpInit::Fold(), llvm::IsAOpInit::getAsString(), llvm::LoopAccessInfo::getPSE(), IsPredicateKnownToFail(), llvm::IsAOpInit::Profile(), llvm::IsAOpInit::resolveReferences(), and llvm::SelectionDAGISel::SelectCodeCommon().

CheckValueType()

static LLVM_ATTRIBUTE_ALWAYS_INLINE bool CheckValueType ( const unsigned char *  MatcherTable, unsigned &  MatcherIndex, SDValue  N, const TargetLowering *  TLI, const DataLayout &  DL  )

inlinestatic

Definition at line 2731 of file SelectionDAGISel.cpp.

References llvm::TargetLoweringBase::getPointerTy(), llvm::MVT::iPTR, LLVM_ATTRIBUTE_ALWAYS_INLINE, and N.

Referenced by IsPredicateKnownToFail(), and llvm::SelectionDAGISel::SelectCodeCommon().

createSwiftErrorEntriesInEntryBlock()

static void createSwiftErrorEntriesInEntryBlock ( FunctionLoweringInfo *  FuncInfo, FastISel *  FastIS, const TargetLowering *  TLI, const TargetInstrInfo *  TII, SelectionDAGBuilder *  SDB  )

static

Definition at line 1265 of file SelectionDAGISel.cpp.

References assert(), llvm::MachineFunction::begin(), llvm::BuildMI(), llvm::MachineRegisterInfo::createVirtualRegister(), llvm::SmallVectorBase::empty(), llvm::MCInstrInfo::get(), llvm::SelectionDAGBuilder::getCurDebugLoc(), llvm::MachineFunction::getDataLayout(), llvm::MachineBasicBlock::getFirstNonPHI(), llvm::TargetLoweringBase::getPointerTy(), llvm::TargetLoweringBase::getRegClassFor(), llvm::MachineFunction::getRegInfo(), llvm::FunctionLoweringInfo::InsertPt, llvm::FunctionLoweringInfo::MBB, llvm::FunctionLoweringInfo::MF, llvm::FunctionLoweringInfo::setCurrentSwiftErrorVReg(), llvm::FastISel::setLastLocalValue(), llvm::TargetLowering::supportSwiftError(), llvm::FunctionLoweringInfo::SwiftErrorArg, and llvm::FunctionLoweringInfo::SwiftErrorVals.

findGlueUse()

static SDNode* findGlueUse ( SDNode *  N )

static

findGlueUse - Return use of MVT::Glue value produced by the specified SDNode.

Definition at line 2289 of file SelectionDAGISel.cpp.

References E, llvm::SDNode::getNumValues(), llvm::SDUse::getResNo(), llvm::SDUse::getUser(), I, llvm::SDNode::use_begin(), and llvm::SDNode::use_end().

Referenced by llvm::SelectionDAGISel::IsLegalToFold().

findNonImmUse()

static bool findNonImmUse ( SDNode *  Root, SDNode *  Def, SDNode *  ImmedUse, bool  IgnoreChains  )

static

findNonImmUse - Return true if "Def" is a predecessor of "Root" via a path beyond "ImmedUse".

We may ignore chains as they are checked separately.

Definition at line 2301 of file SelectionDAGISel.cpp.

References llvm::SDNode::hasPredecessorHelper(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::SDNode::isOnlyUserOf(), N, llvm::SDNode::op_values(), llvm::MVT::Other, and llvm::SmallVectorTemplateBase< T >::push_back().

Referenced by llvm::SelectionDAGISel::IsLegalToFold().

FindSplitPointForStackProtector()

static MachineBasicBlock::iterator FindSplitPointForStackProtector ( MachineBasicBlock *  BB )

static

Find the split point at which to splice the end of BB into its success stack protector check machine basic block.

On many platforms, due to ABI constraints, terminators, even before register allocation, use physical registers. This creates an issue for us since physical registers at this point can not travel across basic blocks. Luckily, selectiondag always moves physical registers into vregs when they enter functions and moves them through a sequence of copies back into the physical registers right before the terminator creating a ``Terminator Sequence''. This function is searching for the beginning of the terminator sequence so that we can ensure that we splice off not just the terminator, but additionally the copies that move the vregs into the physical registers.

Definition at line 1873 of file SelectionDAGISel.cpp.

References llvm::MachineBasicBlock::begin(), and llvm::MachineBasicBlock::getFirstTerminator().

GetVBR()

static LLVM_ATTRIBUTE_ALWAYS_INLINE uint64_t GetVBR ( uint64_t  Val, const unsigned char *  MatcherTable, unsigned &  Idx  )

inlinestatic

GetVBR - decode a vbr encoding whose top bit is set.

Definition at line 2463 of file SelectionDAGISel.cpp.

References assert(), llvm::SmallVectorTemplateCommon< T >::begin(), llvm::count(), llvm::SelectionDAGISel::CurDAG, llvm::dbgs(), llvm::ISD::DELETED_NODE, E, llvm::SmallVectorBase::empty(), llvm::SmallVectorTemplateCommon< T >::end(), llvm::SDValue::getNode(), llvm::SDNode::getNumValues(), llvm::SDNode::getOpcode(), llvm::SDValue::getValue(), llvm::SDValue::getValueType(), llvm::MVT::Glue, LLVM_DEBUG, N, llvm::MVT::Other, llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SelectionDAG::RemoveDeadNodes(), replace(), llvm::SelectionDAGISel::ReplaceUses(), llvm::SmallVectorBase::size(), llvm::ISD::TokenFactor, and llvm::SDNode::use_empty().

Referenced by CheckAndImm(), CheckInteger(), CheckOrImm(), and llvm::SelectionDAGISel::SelectCodeCommon().

HandleMergeInputChains()

static SDValue HandleMergeInputChains ( SmallVectorImpl< SDNode *> &  ChainNodesMatched, SelectionDAG *  CurDAG  )

static

HandleMergeInputChains - This implements the OPC_EmitMergeInputChains operation for when the pattern matched at least one node with a chains.

The input vector contains a list of all of the chained nodes that we match. We must determine if this is a valid thing to cover (i.e. matching it won't induce cycles in the DAG) and if so, creating a TokenFactor node. that will be used as the input node chain for the generated nodes.

Definition at line 2539 of file SelectionDAGISel.cpp.

References llvm::SmallPtrSetImplBase::clear(), llvm::SmallVectorBase::empty(), llvm::ISD::EntryToken, llvm::SelectionDAG::getEntryNode(), llvm::SelectionDAG::getNode(), llvm::SDNode::getOperand(), llvm::SDNode::hasPredecessorHelper(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::SDNode::op_values(), llvm::MVT::Other, llvm::SmallVectorImpl< T >::pop_back_val(), llvm::SmallVectorTemplateBase< T >::push_back(), second, llvm::SmallVectorBase::size(), and llvm::ISD::TokenFactor.

Referenced by llvm::SelectionDAGISel::SelectCodeCommon().

hasExceptionPointerOrCodeUser()

static bool hasExceptionPointerOrCodeUser ( const CatchPadInst *  CPI )

static

Definition at line 1121 of file SelectionDAGISel.cpp.

References llvm::Intrinsic::eh_exceptioncode, llvm::Intrinsic::eh_exceptionpointer, and llvm::Value::users().

Referenced by mapWasmLandingPadIndex().

isFoldedOrDeadInstruction()

static bool isFoldedOrDeadInstruction ( const Instruction *  I, FunctionLoweringInfo *  FuncInfo  )

static

isFoldedOrDeadInstruction - Return true if the specified instruction is side-effect free and is either dead or folded into a generated instruction.

Return false if it needs to be emitted.

Definition at line 1222 of file SelectionDAGISel.cpp.

References I, llvm::Instruction::isEHPad(), llvm::FunctionLoweringInfo::isExportedInst(), llvm::Instruction::isTerminator(), and llvm::Instruction::mayWriteToMemory().

IsPredicateKnownToFail()

static unsigned IsPredicateKnownToFail ( const unsigned char *  Table, unsigned  Index, SDValue  N, bool &  Result, const SelectionDAGISel &  SDISel, SmallVectorImpl< std::pair< SDValue, SDNode *>> &  RecordedNodes  )

static

IsPredicateKnownToFail - If we know how and can do so without pushing a scope, evaluate the current node.

If the current predicate is known to fail, set Result=true and return anything. If the current predicate is known to pass, set Result=false and return the MatcherIndex to continue with. If the current predicate is unknown, set Result=false and return the MatcherIndex to continue with.

Definition at line 2792 of file SelectionDAGISel.cpp.

References CheckAndImm(), CheckChildInteger(), CheckChildSame(), CheckChildType(), CheckCondCode(), CheckInteger(), llvm::SelectionDAGISel::CheckNodePredicate(), CheckOpcode(), CheckOrImm(), llvm::SelectionDAGISel::CheckPatternPredicate(), CheckSame(), CheckType(), CheckValueType(), llvm::SelectionDAGISel::CurDAG, llvm::SelectionDAG::DAGUpdateListener, E, llvm::SelectionDAG::getDataLayout(), llvm::SDValue::getNode(), llvm::SDValue::getValue(), I, llvm::SDNode::isMachineOpcode(), N, llvm::SelectionDAGISel::OPC_CheckAndImm, llvm::SelectionDAGISel::OPC_CheckChild0Integer, llvm::SelectionDAGISel::OPC_CheckChild0Same, llvm::SelectionDAGISel::OPC_CheckChild0Type, llvm::SelectionDAGISel::OPC_CheckChild1Integer, llvm::SelectionDAGISel::OPC_CheckChild1Same, llvm::SelectionDAGISel::OPC_CheckChild1Type, llvm::SelectionDAGISel::OPC_CheckChild2Integer, llvm::SelectionDAGISel::OPC_CheckChild2Same, llvm::SelectionDAGISel::OPC_CheckChild2Type, llvm::SelectionDAGISel::OPC_CheckChild3Integer, llvm::SelectionDAGISel::OPC_CheckChild3Same, llvm::SelectionDAGISel::OPC_CheckChild3Type, llvm::SelectionDAGISel::OPC_CheckChild4Integer, llvm::SelectionDAGISel::OPC_CheckChild4Type, llvm::SelectionDAGISel::OPC_CheckChild5Type, llvm::SelectionDAGISel::OPC_CheckChild6Type, llvm::SelectionDAGISel::OPC_CheckChild7Type, llvm::SelectionDAGISel::OPC_CheckCondCode, llvm::SelectionDAGISel::OPC_CheckInteger, llvm::SelectionDAGISel::OPC_CheckOpcode, llvm::SelectionDAGISel::OPC_CheckOrImm, llvm::SelectionDAGISel::OPC_CheckPatternPredicate, llvm::SelectionDAGISel::OPC_CheckPredicate, llvm::SelectionDAGISel::OPC_CheckSame, llvm::SelectionDAGISel::OPC_CheckType, llvm::SelectionDAGISel::OPC_CheckTypeRes, llvm::SelectionDAGISel::OPC_CheckValueType, llvm::NVPTX::PTXCvtMode::RN, and llvm::SelectionDAGISel::TLI.

Referenced by llvm::SelectionDAGISel::SelectCodeCommon().

mapWasmLandingPadIndex()

static void mapWasmLandingPadIndex ( MachineBasicBlock *  MBB, const CatchPadInst *  CPI  )

static

Definition at line 1136 of file SelectionDAGISel.cpp.

References llvm::MachineFunction::addLandingPad(), llvm::MachineBasicBlock::addLiveIn(), assert(), llvm::BuildMI(), llvm::classifyEHPersonality(), llvm::SelectionDAGISel::CurDAG, llvm::ISD::EH_LABEL, llvm::FunctionLoweringInfo::ExceptionPointerVirtReg, llvm::FunctionLoweringInfo::ExceptionSelectorVirtReg, llvm::FunctionLoweringInfo::Fn, llvm::SelectionDAGISel::FuncInfo, llvm::MCInstrInfo::get(), llvm::FuncletPadInst::getArgOperand(), llvm::MachineBasicBlock::getBasicBlock(), llvm::FunctionLoweringInfo::getCatchPadExceptionPointerVReg(), llvm::SelectionDAGBuilder::getCurDebugLoc(), llvm::SelectionDAG::getDataLayout(), llvm::TargetLoweringBase::getExceptionPointerRegister(), llvm::TargetLoweringBase::getExceptionSelectorRegister(), llvm::BasicBlock::getFirstNonPHI(), llvm::FuncletPadInst::getNumArgOperands(), llvm::MachineBasicBlock::getParent(), llvm::Function::getPersonalityFn(), llvm::TargetLoweringBase::getPointerTy(), llvm::TargetLoweringBase::getRegClassFor(), hasExceptionPointerOrCodeUser(), llvm::FunctionLoweringInfo::InsertPt, llvm::isFuncletEHPersonality(), llvm::RegState::Kill, llvm::SelectionDAGBuilder::LPadToCallSiteMap, llvm::FunctionLoweringInfo::MBB, llvm::SelectionDAGISel::MF, Reg, llvm::SelectionDAGISel::SDB, llvm::MachineFunction::setCallSiteLandingPad(), llvm::MachineFunction::setWasmLandingPadIndex(), llvm::SelectionDAGISel::TII, llvm::SelectionDAGISel::TLI, llvm::Value::users(), llvm::Wasm_CXX, and llvm::Intrinsic::wasm_landingpad_index.

MIIsInTerminatorSequence()

static bool MIIsInTerminatorSequence ( const MachineInstr &  MI )

static

Given that the input MI is before a partial terminator sequence TSeq, return true if M + TSeq also a partial terminator sequence.

A Terminator sequence is a sequence of MachineInstrs which at this point in lowering copy vregs into physical registers, which are then passed into terminator instructors so we can satisfy ABI constraints. A partial terminator sequence is an improper subset of a terminator sequence (i.e. it may be the whole terminator sequence).

Definition at line 1817 of file SelectionDAGISel.cpp.

References assert(), llvm::MachineOperand::getReg(), llvm::MachineInstr::isCopy(), llvm::MachineInstr::isDebugValue(), llvm::MachineOperand::isDef(), llvm::MachineInstr::isImplicitDef(), llvm::TargetRegisterInfo::isPhysicalRegister(), llvm::MachineOperand::isReg(), llvm::MachineInstr::operands_begin(), and llvm::MachineInstr::operands_end().

preassignSwiftErrorRegs()

static void preassignSwiftErrorRegs ( const TargetLowering *  TLI, FunctionLoweringInfo *  FuncInfo, BasicBlock::const_iterator  Begin, BasicBlock::const_iterator  End  )

static

Definition at line 1462 of file SelectionDAGISel.cpp.

References llvm::SmallVectorBase::empty(), llvm::TargetLowering::supportSwiftError(), and llvm::FunctionLoweringInfo::SwiftErrorVals.

processDbgDeclares()

static void processDbgDeclares ( FunctionLoweringInfo *  FuncInfo )

static

Collect llvm.dbg.declare information.

This is done after argument lowering in case the declarations refer to arguments.

Definition at line 1304 of file SelectionDAGISel.cpp.

References llvm::Address, Arg, assert(), llvm::dyn_cast(), llvm::FunctionLoweringInfo::Fn, llvm::DbgDeclareInst::getAddress(), llvm::FunctionLoweringInfo::getArgumentFrameIndex(), llvm::APInt::getBoolValue(), llvm::MachineFunction::getDataLayout(), llvm::Instruction::getDebugLoc(), llvm::DbgVariableIntrinsic::getExpression(), llvm::DataLayout::getTypeSizeInBits(), llvm::DbgVariableIntrinsic::getVariable(), llvm::APInt::getZExtValue(), I, llvm::max(), llvm::SelectionDAGISel::MF, llvm::FunctionLoweringInfo::MF, llvm::DIExpression::NoDeref, llvm::DIExpression::prepend(), llvm::MachineFunction::setVariableDbgInfo(), SI, and llvm::FunctionLoweringInfo::StaticAllocaMap.

propagateSwiftErrorVRegs()

static void propagateSwiftErrorVRegs ( FunctionLoweringInfo *  FuncInfo )

static

Propagate swifterror values through the machine function CFG.

Definition at line 1348 of file SelectionDAGISel.cpp.

References llvm::MachineInstrBuilder::addMBB(), llvm::MachineInstrBuilder::addReg(), assert(), llvm::SmallVectorTemplateCommon< T >::begin(), llvm::BuildMI(), llvm::MachineRegisterInfo::createVirtualRegister(), llvm::SmallVectorBase::empty(), llvm::SmallVectorTemplateCommon< T >::end(), llvm::find_if(), llvm::MCInstrInfo::get(), llvm::MachineFunction::getDataLayout(), llvm::TargetSubtargetInfo::getInstrInfo(), llvm::FunctionLoweringInfo::getOrCreateSwiftErrorVReg(), llvm::TargetLoweringBase::getPointerTy(), llvm::TargetLoweringBase::getRegClassFor(), llvm::MachineFunction::getRegInfo(), llvm::MachineFunction::getSubtarget(), llvm::SmallSet< T, N, C >::insert(), llvm::FunctionLoweringInfo::MF, llvm::SmallVectorTemplateBase< T >::push_back(), second, llvm::FunctionLoweringInfo::setCurrentSwiftErrorVReg(), llvm::SmallVectorBase::size(), llvm::TargetLowering::supportSwiftError(), llvm::FunctionLoweringInfo::SwiftErrorVals, llvm::FunctionLoweringInfo::SwiftErrorVRegDefMap, llvm::FunctionLoweringInfo::SwiftErrorVRegUpwardsUse, llvm::SelectionDAGISel::TII, llvm::FunctionLoweringInfo::TLI, and llvm::SelectionDAGISel::TLI.

reportFastISelFailure()

static void reportFastISelFailure ( MachineFunction &  MF, OptimizationRemarkEmitter &  ORE, OptimizationRemarkMissed &  R, bool  ShouldAbort  )

static

Definition at line 635 of file SelectionDAGISel.cpp.

References llvm::OptimizationRemarkEmitter::emit(), llvm::DiagnosticInfoWithLocationBase::getLocation(), llvm::DiagnosticInfoOptimizationBase::getMsg(), llvm::MachineFunction::getName(), and llvm::report_fatal_error().

setupSwiftErrorVals()

static void setupSwiftErrorVals ( const Function &  Fn, const TargetLowering *  TLI, FunctionLoweringInfo *  FuncInfo  )

static

Set up SwiftErrorVals by going through the function.

If the function has swifterror argument, it will be the first entry.

Definition at line 1233 of file SelectionDAGISel.cpp.

References llvm::Function::arg_begin(), llvm::Function::arg_end(), assert(), llvm::SmallVectorImpl< T >::clear(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::TargetLowering::supportSwiftError(), llvm::FunctionLoweringInfo::SwiftErrorArg, llvm::FunctionLoweringInfo::SwiftErrorVals, llvm::FunctionLoweringInfo::SwiftErrorVRegDefMap, llvm::FunctionLoweringInfo::SwiftErrorVRegDefUses, and llvm::FunctionLoweringInfo::SwiftErrorVRegUpwardsUse.

SplitCriticalSideEffectEdges()

static void SplitCriticalSideEffectEdges ( Function &  Fn, DominatorTree *  DT, LoopInfo *  LI  )

static

SplitCriticalSideEffectEdges - Look for critical edges with a PHI value that may trap on it.

In this case we have to split the edge so that the path through the predecessor block that doesn't go to the phi block doesn't execute the possibly trapping instruction. If available, we pass domtree and loop info to be updated when we split critical edges. This is because SelectionDAGISel preserves these analyses. This is required for correctness, so it must be done at -O0.

Definition at line 349 of file SelectionDAGISel.cpp.

References llvm::Constant::canTrap(), llvm::dyn_cast(), llvm::PHINode::getIncomingBlock(), llvm::PHINode::getIncomingValue(), llvm::PHINode::getNumIncomingValues(), llvm::Instruction::getNumSuccessors(), llvm::GetSuccessorNumber(), llvm::BasicBlock::getTerminator(), I, llvm::CriticalEdgeSplittingOptions::setMergeIdenticalEdges(), and llvm::SplitCriticalEdge().

Referenced by llvm::SelectionDAGISel::runOnMachineFunction().

STATISTIC() [1/7]

STATISTIC	(	NumFastIselFailures	,
		"Number of instructions fast isel failed on"
	)

STATISTIC() [2/7]

STATISTIC	(	NumFastIselSuccess	,
		"Number of instructions fast isel selected"
	)

STATISTIC() [3/7]

STATISTIC	(	NumFastIselBlocks	,
		"Number of blocks selected entirely by fast isel"
	)

STATISTIC() [4/7]

STATISTIC	(	NumDAGBlocks	,
		"Number of blocks selected using DAG"
	)

STATISTIC() [5/7]

STATISTIC	(	NumDAGIselRetries	,
		"Number of times dag isel has to try another path"
	)

STATISTIC() [6/7]

STATISTIC	(	NumEntryBlocks	,
		"Number of entry blocks encountered"
	)

STATISTIC() [7/7]

STATISTIC	(	NumFastIselFailLowerArguments	,
		"Number of entry blocks where fast isel failed to lower arguments"
	)

Variable Documentation

defaultListDAGScheduler

RegisterScheduler defaultListDAGScheduler("default", "Best scheduler for the target", createDefaultScheduler)

static

EnableFastISelAbort

cl::opt<int> EnableFastISelAbort("fast-isel-abort", cl::Hidden, cl::desc("Enable abort calls when \fast\ instruction selection " "fails to lower an instruction: 0 disable the abort, 1 will " "abort but for args, calls and terminators, 2 will also " "abort for argument lowering, and 3 will never fallback " "to SelectionDAG."))

static

Referenced by llvm::SelectionDAGISel::runOnMachineFunction().

EnableFastISelFallbackReport

cl::opt<bool> EnableFastISelFallbackReport("fast-isel-report-on-fallback", cl::Hidden, cl::desc("Emit a diagnostic when \fast\ instruction selection " "falls back to SelectionDAG."))

static

Referenced by llvm::SelectionDAGISel::runOnMachineFunction().

FilterDAGBasicBlockName

cl::opt<std::string> FilterDAGBasicBlockName("filter-view-dags", cl::Hidden, cl::desc("Only display the basic block whose name " "matches this for all view-*-dags options"))

static

ISHeuristic

cl::opt<RegisterScheduler::FunctionPassCtor, false, RegisterPassParser<RegisterScheduler> > ISHeuristic("pre-RA-sched", cl::init(&createDefaultScheduler), cl::Hidden, cl::desc("Instruction schedulers available (before register" " allocation):"))

static

ISHeuristic command line option for instruction schedulers.

UseMBPI

cl::opt<bool> UseMBPI("use-mbpi", cl::desc("use Machine Branch Probability Info"), cl::init(true), cl::Hidden)

static

Referenced by llvm::SelectionDAGISel::getAnalysisUsage(), and llvm::SelectionDAGISel::runOnMachineFunction().

ViewDAGCombine1

cl::opt<bool> ViewDAGCombine1("view-dag-combine1-dags", cl::Hidden, cl::desc("Pop up a window to show dags before the first " "dag combine pass"))

static

ViewDAGCombine2

cl::opt<bool> ViewDAGCombine2("view-dag-combine2-dags", cl::Hidden, cl::desc("Pop up a window to show dags before the second " "dag combine pass"))

static

ViewDAGCombineLT

cl::opt<bool> ViewDAGCombineLT("view-dag-combine-lt-dags", cl::Hidden, cl::desc("Pop up a window to show dags before the post legalize types" " dag combine pass"))

static

ViewISelDAGs

cl::opt<bool> ViewISelDAGs("view-isel-dags", cl::Hidden, cl::desc("Pop up a window to show isel dags as they are selected"))

static

ViewLegalizeDAGs

cl::opt<bool> ViewLegalizeDAGs("view-legalize-dags", cl::Hidden, cl::desc("Pop up a window to show dags before legalize"))

static

ViewLegalizeTypesDAGs

cl::opt<bool> ViewLegalizeTypesDAGs("view-legalize-types-dags", cl::Hidden, cl::desc("Pop up a window to show dags before legalize types"))

static

ViewSchedDAGs

cl::opt<bool> ViewSchedDAGs("view-sched-dags", cl::Hidden, cl::desc("Pop up a window to show sched dags as they are processed"))

static

ViewSUnitDAGs

cl::opt<bool> ViewSUnitDAGs("view-sunit-dags", cl::Hidden, cl::desc("Pop up a window to show SUnit dags after they are processed"))

static