DAGCombiner.cpp File Reference

#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/IntervalMap.h"
#include "llvm/ADT/None.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/CodeGen/DAGCombine.h"
#include "llvm/CodeGen/ISDOpcodes.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/RuntimeLibcalls.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGAddressAnalysis.h"
#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.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/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <functional>
#include <iterator>
#include <string>
#include <tuple>
#include <utility>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "dagcombine"

Functions
	STATISTIC (NodesCombined, "Number of dag nodes combined")
	STATISTIC (PreIndexedNodes, "Number of pre-indexed nodes created")
	STATISTIC (PostIndexedNodes, "Number of post-indexed nodes created")
	STATISTIC (OpsNarrowed, "Number of load/op/store narrowed")
	STATISTIC (LdStFP2Int, "Number of fp load/store pairs transformed to int")
	STATISTIC (SlicedLoads, "Number of load sliced")
	STATISTIC (NumFPLogicOpsConv, "Number of logic ops converted to fp ops")
static char	isNegatibleForFree (SDValue Op, bool LegalOperations, const TargetLowering &TLI, const TargetOptions *Options, bool ForCodeSize, unsigned Depth=0)
	Return 1 if we can compute the negated form of the specified expression for the same cost as the expression itself, or 2 if we can compute the negated form more cheaply than the expression itself. More...
static SDValue	GetNegatedExpression (SDValue Op, SelectionDAG &DAG, bool LegalOperations, bool ForCodeSize, unsigned Depth=0)
	If isNegatibleForFree returns true, return the newly negated expression. More...
static void	zeroExtendToMatch (APInt &LHS, APInt &RHS, unsigned Offset=0)
static SDNode *	isConstantFPBuildVectorOrConstantFP (SDValue N)
static bool	isConstantOrConstantVector (SDValue N, bool NoOpaques=false)
static bool	isAnyConstantBuildVector (SDValue V, bool NoOpaques=false)
static SDValue	getInputChainForNode (SDNode *N)
	Given a node, return its input chain if it has one, otherwise return a null sd operand. More...
static ConstantSDNode *	getAsNonOpaqueConstant (SDValue N)
	If N is a ConstantSDNode with isOpaque() == false return it casted to a ConstantSDNode pointer else nullptr. More...
static SDValue	foldAddSubBoolOfMaskedVal (SDNode *N, SelectionDAG &DAG)
static SDValue	foldAddSubOfSignBit (SDNode *N, SelectionDAG &DAG)
	Try to fold a 'not' shifted sign-bit with add/sub with constant operand into a shift and add with a different constant. More...
static SDValue	getAsCarry (const TargetLowering &TLI, SDValue V)
static SDValue	foldAddSubMasked1 (bool IsAdd, SDValue N0, SDValue N1, SelectionDAG &DAG, const SDLoc &DL)
	Given the operands of an add/sub operation, see if the 2nd operand is a masked 0/1 whose source operand is actually known to be 0/-1. More...
static SDValue	flipBoolean (SDValue V, const SDLoc &DL, SelectionDAG &DAG, const TargetLowering &TLI)
static SDValue	extractBooleanFlip (SDValue V, SelectionDAG &DAG, const TargetLowering &TLI, bool Force)
	Flips a boolean if it is cheaper to compute. More...
static SDValue	combineADDCARRYDiamond (DAGCombiner &Combiner, SelectionDAG &DAG, SDValue X, SDValue Carry0, SDValue Carry1, SDNode *N)
	If we are facing some sort of diamond carry propapagtion pattern try to break it up to generate something like: (addcarry X, 0, (addcarry A, B, Z):Carry) More...
static SDValue	tryFoldToZero (const SDLoc &DL, const TargetLowering &TLI, EVT VT, SelectionDAG &DAG, bool LegalOperations)
static bool	isDivRemLibcallAvailable (SDNode *Node, bool isSigned, const TargetLowering &TLI)
	Return true if divmod libcall is available. More...
static SDValue	simplifyDivRem (SDNode *N, SelectionDAG &DAG)
static bool	isBSwapHWordElement (SDValue N, MutableArrayRef< SDNode *> Parts)
	Return true if the specified node is an element that makes up a 32-bit packed halfword byteswap. More...
static SDValue	visitORCommutative (SelectionDAG &DAG, SDValue N0, SDValue N1, SDNode *N)
	OR combines for which the commuted variant will be tried as well. More...
static SDValue	stripConstantMask (SelectionDAG &DAG, SDValue Op, SDValue &Mask)
static bool	matchRotateHalf (SelectionDAG &DAG, SDValue Op, SDValue &Shift, SDValue &Mask)
	Match "(X shl/srl V1) & V2" where V2 may not be present. More...
static SDValue	extractShiftForRotate (SelectionDAG &DAG, SDValue OppShift, SDValue ExtractFrom, SDValue &Mask, const SDLoc &DL)
	Helper function for visitOR to extract the needed side of a rotate idiom from a shl/srl/mul/udiv. More...
static bool	matchRotateSub (SDValue Pos, SDValue Neg, unsigned EltSize, SelectionDAG &DAG)
static const Optional< ByteProvider >	calculateByteProvider (SDValue Op, unsigned Index, unsigned Depth, bool Root=false)
	Recursively traverses the expression calculating the origin of the requested byte of the given value. More...
static unsigned	LittleEndianByteAt (unsigned BW, unsigned i)
static unsigned	BigEndianByteAt (unsigned BW, unsigned i)
static Optional< bool >	isBigEndian (const SmallVector< int64_t, 4 > &ByteOffsets, int64_t FirstOffset)
static SDValue	stripTruncAndExt (SDValue Value)
static bool	isLegalToCombineMinNumMaxNum (SelectionDAG &DAG, SDValue LHS, SDValue RHS, const TargetLowering &TLI)
static SDValue	combineMinNumMaxNum (const SDLoc &DL, EVT VT, SDValue LHS, SDValue RHS, SDValue True, SDValue False, ISD::CondCode CC, const TargetLowering &TLI, SelectionDAG &DAG)
	Generate Min/Max node. More...
static SDValue	ConvertSelectToConcatVector (SDNode *N, SelectionDAG &DAG)
static SDValue	tryToFoldExtendOfConstant (SDNode *N, const TargetLowering &TLI, SelectionDAG &DAG, bool LegalTypes)
	Try to fold a sext/zext/aext dag node into a ConstantSDNode or a build_vector of constants. More...
static bool	ExtendUsesToFormExtLoad (EVT VT, SDNode *N, SDValue N0, unsigned ExtOpc, SmallVectorImpl< SDNode *> &ExtendNodes, const TargetLowering &TLI)
static SDValue	tryToFoldExtOfExtload (SelectionDAG &DAG, DAGCombiner &Combiner, const TargetLowering &TLI, EVT VT, bool LegalOperations, SDNode *N, SDValue N0, ISD::LoadExtType ExtLoadType)
static SDValue	tryToFoldExtOfLoad (SelectionDAG &DAG, DAGCombiner &Combiner, const TargetLowering &TLI, EVT VT, bool LegalOperations, SDNode *N, SDValue N0, ISD::LoadExtType ExtLoadType, ISD::NodeType ExtOpc)
static SDValue	foldExtendedSignBitTest (SDNode *N, SelectionDAG &DAG, bool LegalOperations)
static bool	isTruncateOf (SelectionDAG &DAG, SDValue N, SDValue &Op, KnownBits &Known)
static SDNode *	getBuildPairElt (SDNode *N, unsigned i)
static unsigned	getPPCf128HiElementSelector (const SelectionDAG &DAG)
static SDValue	foldBitcastedFPLogic (SDNode *N, SelectionDAG &DAG, const TargetLowering &TLI)
static bool	isContractable (SDNode *N)
static bool	CanCombineFCOPYSIGN_EXTEND_ROUND (SDNode *N)
	copysign(x, fp_extend(y)) -> copysign(x, y) copysign(x, fp_round(y)) -> copysign(x, y) More...
static SDValue	foldFPToIntToFP (SDNode *N, SelectionDAG &DAG, const TargetLowering &TLI)
static SDValue	FoldIntToFPToInt (SDNode *N, SelectionDAG &DAG)
static SDValue	visitFMinMax (SelectionDAG &DAG, SDNode *N, APFloat(*Op)(const APFloat &, const APFloat &))
static bool	canFoldInAddressingMode (SDNode *N, SDNode *Use, SelectionDAG &DAG, const TargetLowering &TLI)
	Return true if 'Use' is a load or a store that uses N as its base pointer and that N may be folded in the load / store addressing mode. More...
static int	numVectorEltsOrZero (EVT T)
static bool	areUsedBitsDense (const APInt &UsedBits)
	Check that all bits set in UsedBits form a dense region, i.e., UsedBits looks like 0..0 1..1 0..0. More...
static bool	areSlicesNextToEachOther (const LoadedSlice &First, const LoadedSlice &Second)
	Check whether or not First and Second are next to each other in memory. More...
static void	adjustCostForPairing (SmallVectorImpl< LoadedSlice > &LoadedSlices, LoadedSlice::Cost &GlobalLSCost)
	Adjust the GlobalLSCost according to the target paring capabilities and the layout of the slices. More...
static bool	isSlicingProfitable (SmallVectorImpl< LoadedSlice > &LoadedSlices, const APInt &UsedBits, bool ForCodeSize)
	Check the profitability of all involved LoadedSlice. More...
static std::pair< unsigned, unsigned >	CheckForMaskedLoad (SDValue V, SDValue Ptr, SDValue Chain)
	Check to see if V is (and load (ptr), imm), where the load is having specific bytes cleared out. More...
static SDValue	ShrinkLoadReplaceStoreWithStore (const std::pair< unsigned, unsigned > &MaskInfo, SDValue IVal, StoreSDNode *St, DAGCombiner *DC)
	Check to see if IVal is something that provides a value as specified by MaskInfo. More...
static SDValue	scalarizeExtractedBinop (SDNode *ExtElt, SelectionDAG &DAG, bool LegalOperations)
	Transform a vector binary operation into a scalar binary operation by moving the math/logic after an extract element of a vector. More...
static SDValue	reduceBuildVecToShuffleWithZero (SDNode *BV, SelectionDAG &DAG)
static SDValue	combineConcatVectorOfScalars (SDNode *N, SelectionDAG &DAG)
static SDValue	combineConcatVectorOfExtracts (SDNode *N, SelectionDAG &DAG)
static SDValue	getSubVectorSrc (SDValue V, SDValue Index, EVT SubVT)
static SDValue	narrowInsertExtractVectorBinOp (SDNode *Extract, SelectionDAG &DAG)
static SDValue	narrowExtractedVectorBinOp (SDNode *Extract, SelectionDAG &DAG)
	If we are extracting a subvector produced by a wide binary operator try to use a narrow binary operator and/or avoid concatenation and extraction. More...
static SDValue	narrowExtractedVectorLoad (SDNode *Extract, SelectionDAG &DAG)
	If we are extracting a subvector from a wide vector load, convert to a narrow load to eliminate the extraction: (extract_subvector (load wide vector)) –> (load narrow vector) More...
static SDValue	foldShuffleOfConcatUndefs (ShuffleVectorSDNode *Shuf, SelectionDAG &DAG)
	Try to convert a wide shuffle of concatenated vectors into 2 narrow shuffles followed by concatenation. More...
static SDValue	partitionShuffleOfConcats (SDNode *N, SelectionDAG &DAG)
static SDValue	combineShuffleOfScalars (ShuffleVectorSDNode *SVN, SelectionDAG &DAG, const TargetLowering &TLI)
static SDValue	combineShuffleToVectorExtend (ShuffleVectorSDNode *SVN, SelectionDAG &DAG, const TargetLowering &TLI, bool LegalOperations)
static SDValue	combineTruncationShuffle (ShuffleVectorSDNode *SVN, SelectionDAG &DAG)
static SDValue	combineShuffleOfSplatVal (ShuffleVectorSDNode *Shuf, SelectionDAG &DAG)
static int	getShuffleMaskIndexOfOneElementFromOp0IntoOp1 (ArrayRef< int > Mask)
	If the shuffle mask is taking exactly one element from the first vector operand and passing through all other elements from the second vector operand, return the index of the mask element that is choosing an element from the first operand. More...
static SDValue	replaceShuffleOfInsert (ShuffleVectorSDNode *Shuf, SelectionDAG &DAG)
	If a shuffle inserts exactly one element from a source vector operand into another vector operand and we can access the specified element as a scalar, then we can eliminate the shuffle. More...
static SDValue	simplifyShuffleOfShuffle (ShuffleVectorSDNode *Shuf)
	If we have a unary shuffle of a shuffle, see if it can be folded away completely. More...
static SDValue	scalarizeBinOpOfSplats (SDNode *N, SelectionDAG &DAG)
	If a vector binop is performed on splat values, it may be profitable to extract, scalarize, and insert/splat. More...

Variables
static cl::opt< bool >	CombinerGlobalAA ("combiner-global-alias-analysis", cl::Hidden, cl::desc("Enable DAG combiner's use of IR alias analysis"))
static cl::opt< bool >	UseTBAA ("combiner-use-tbaa", cl::Hidden, cl::init(true), cl::desc("Enable DAG combiner's use of TBAA"))
static cl::opt< std::string >	CombinerAAOnlyFunc ("combiner-aa-only-func", cl::Hidden, cl::desc("Only use DAG-combiner alias analysis in this" " function"))
static cl::opt< bool >	StressLoadSlicing ("combiner-stress-load-slicing", cl::Hidden, cl::desc("Bypass the profitability model of load slicing"), cl::init(false))
	Hidden option to stress test load slicing, i.e., when this option is enabled, load slicing bypasses most of its profitability guards. More...
static cl::opt< bool >	MaySplitLoadIndex ("combiner-split-load-index", cl::Hidden, cl::init(true), cl::desc("DAG combiner may split indexing from loads"))
static cl::opt< bool >	EnableStoreMerging ("combiner-store-merging", cl::Hidden, cl::init(true), cl::desc("DAG combiner enable merging multiple stores " "into a wider store"))
static cl::opt< unsigned >	TokenFactorInlineLimit ("combiner-tokenfactor-inline-limit", cl::Hidden, cl::init(2048), cl::desc("Limit the number of operands to inline for Token Factors"))
static cl::opt< unsigned >	StoreMergeDependenceLimit ("combiner-store-merge-dependence-limit", cl::Hidden, cl::init(10), cl::desc("Limit the number of times for the same StoreNode and RootNode " "to bail out in store merging dependence check"))

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "dagcombine"

Definition at line 77 of file DAGCombiner.cpp.

Function Documentation

adjustCostForPairing()

static void adjustCostForPairing ( SmallVectorImpl< LoadedSlice > &  LoadedSlices, LoadedSlice::Cost &  GlobalLSCost  )

static

Adjust the GlobalLSCost according to the target paring capabilities and the layout of the slices.

Precondition

GlobalLSCost should account for at least as many loads as there is in the slices in LoadedSlices.

Definition at line 14384 of file DAGCombiner.cpp.

References areSlicesNextToEachOther(), assert(), llvm::SmallVectorBase::size(), and llvm::sort().

Referenced by isSlicingProfitable().

areSlicesNextToEachOther()

static bool areSlicesNextToEachOther ( const LoadedSlice &  First, const LoadedSlice &  Second  )

static

Check whether or not First and Second are next to each other in memory.

This means that there is no hole between the bits loaded by First and the bits loaded by Second.

Definition at line 14369 of file DAGCombiner.cpp.

References areUsedBitsDense(), and assert().

Referenced by adjustCostForPairing().

areUsedBitsDense()

static bool areUsedBitsDense ( const APInt &  UsedBits )

static

Check that all bits set in UsedBits form a dense region, i.e., UsedBits looks like 0..0 1..1 0..0.

Definition at line 14352 of file DAGCombiner.cpp.

References llvm::APInt::countLeadingZeros(), llvm::APInt::countTrailingZeros(), llvm::APInt::getActiveBits(), llvm::APInt::isAllOnesValue(), llvm::APInt::lshr(), and llvm::APInt::trunc().

Referenced by areSlicesNextToEachOther(), and isSlicingProfitable().

BigEndianByteAt()

static unsigned BigEndianByteAt ( unsigned  BW, unsigned  i  )

static

Definition at line 6490 of file DAGCombiner.cpp.

Referenced by isBigEndian(), and stripTruncAndExt().

calculateByteProvider()

static const Optional<ByteProvider> calculateByteProvider ( SDValue  Op, unsigned  Index, unsigned  Depth, bool  Root = false  )

static

Recursively traverses the expression calculating the origin of the requested byte of the given value.

Returns None if the provider can't be calculated.

For all the values except the root of the expression verifies that the value has exactly one use and if it's not true return None. This way if the origin of the byte is returned it's guaranteed that the values which contribute to the byte are not used outside of this expression.

Because the parts of the expression are not allowed to have more than one use this function iterates over trees, not DAGs. So it never visits the same node more than once.

Definition at line 6400 of file DAGCombiner.cpp.

References llvm::ISD::ANY_EXTEND, assert(), llvm::ISD::BSWAP, llvm::dyn_cast(), getMemory(), llvm::SDValue::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOperand(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDValue::hasOneUse(), llvm::EVT::isScalarInteger(), llvm::ISD::LOAD, llvm::None, llvm::ISD::OR, llvm::ISD::SHL, llvm::ISD::SIGN_EXTEND, llvm::ISD::ZERO_EXTEND, and llvm::ISD::ZEXTLOAD.

Referenced by stripTruncAndExt().

CanCombineFCOPYSIGN_EXTEND_ROUND()

static bool CanCombineFCOPYSIGN_EXTEND_ROUND ( SDNode *  N )

inlinestatic

copysign(x, fp_extend(y)) -> copysign(x, y) copysign(x, fp_round(y)) -> copysign(x, y)

Definition at line 12521 of file DAGCombiner.cpp.

References llvm::MVT::f128, llvm::MVT::f32, llvm::MVT::f64, llvm::ISD::FABS, llvm::ISD::FCBRT, llvm::ISD::FCOPYSIGN, llvm::ISD::FMUL, llvm::ISD::FNEG, llvm::ISD::FP_EXTEND, llvm::ISD::FP_ROUND, llvm::ISD::FPOW, llvm::ISD::FSQRT, llvm::SDNode::getFlags(), llvm::MachineFunction::getFunction(), llvm::SelectionDAG::getLibInfo(), llvm::SelectionDAG::getMachineFunction(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::ConstantFPSDNode::getValueAPF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::TargetLibraryInfo::has(), llvm::SDNodeFlags::hasApproximateFuncs(), llvm::SDNodeFlags::hasNoInfs(), llvm::SDNodeFlags::hasNoNaNs(), llvm::SDNodeFlags::hasNoSignedZeros(), llvm::Function::hasOptSize(), isConstantFPBuildVectorOrConstantFP(), llvm::isConstOrConstSplatFP(), llvm::APFloat::isExactlyValue(), llvm::APFloat::isNegative(), llvm::TargetLoweringBase::isOperationExpand(), llvm::TargetLoweringBase::isOperationLegal(), and llvm::TargetLoweringBase::isOperationLegalOrCustom().

canFoldInAddressingMode()

static bool canFoldInAddressingMode ( SDNode *  N, SDNode *  Use, SelectionDAG &  DAG, const TargetLowering &  TLI  )

static

Return true if 'Use' is a load or a store that uses N as its base pointer and that N may be folded in the load / store addressing mode.

Definition at line 13339 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::AfterLegalizeDAG, assert(), llvm::SmallVectorImpl< T >::clear(), llvm::dbgs(), llvm::SDNode::dump(), llvm::dyn_cast(), llvm::LSBaseSDNode::getAddressingMode(), llvm::SelectionDAG::getConstant(), llvm::ConstantSDNode::getConstantIntValue(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::SelectionDAG::getIndexedLoad(), llvm::SelectionDAG::getIndexedStore(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDNode::getOperand(), llvm::TargetLowering::getPostIndexedAddressParts(), llvm::TargetLowering::getPreIndexedAddressParts(), llvm::ConstantSDNode::getSExtValue(), llvm::SDValue::getSimpleValueType(), llvm::EVT::getTypeForEVT(), llvm::SDUse::getUser(), llvm::SDValue::getValue(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::SDNode::hasOneUse(), llvm::SDNode::hasPredecessorHelper(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::TargetLoweringBase::isIndexedLoadLegal(), llvm::TargetLoweringBase::isIndexedStoreLegal(), llvm::TargetLoweringBase::isLegalAddressingMode(), isLoad(), llvm::isNullConstant(), llvm::SDNode::isPredecessorOf(), llvm::ARM_MB::LD, LLVM_DEBUG, N, llvm::ISD::POST_DEC, llvm::ISD::POST_INC, llvm::ISD::PRE_DEC, llvm::ISD::PRE_INC, llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::SmallVectorBase::size(), llvm::ARM_MB::ST, llvm::ISD::SUB, std::swap(), llvm::ISD::TargetConstant, llvm::ISD::UNINDEXED, llvm::SDNode::use_begin(), llvm::SDNode::use_end(), llvm::Value::uses(), and llvm::SDNode::uses().

CheckForMaskedLoad()

static std::pair<unsigned, unsigned> CheckForMaskedLoad ( SDValue  V, SDValue  Ptr, SDValue  Chain  )

static

Check to see if V is (and load (ptr), imm), where the load is having specific bytes cleared out.

If so, return the byte size being masked out and the shift amount.

Definition at line 14590 of file DAGCombiner.cpp.

References llvm::ISD::AND, llvm::countLeadingZeros(), llvm::countTrailingOnes(), llvm::countTrailingZeros(), llvm::LoadSDNode::getBasePtr(), llvm::SDValue::getNode(), llvm::SDNode::getOpcode(), llvm::SDNode::getOperand(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDValue::hasOneUse(), llvm::MVT::i16, llvm::MVT::i32, llvm::MVT::i64, llvm::ISD::isNormalLoad(), llvm::SDNode::isOperandOf(), and llvm::ISD::TokenFactor.

Referenced by ShrinkLoadReplaceStoreWithStore().

combineADDCARRYDiamond()

static SDValue combineADDCARRYDiamond ( DAGCombiner &  Combiner, SelectionDAG &  DAG, SDValue  X, SDValue  Carry0, SDValue  Carry1, SDNode *  N  )

static

If we are facing some sort of diamond carry propapagtion pattern try to break it up to generate something like: (addcarry X, 0, (addcarry A, B, Z):Carry)

The end result is usually an increase in operation required, but because the carry is now linearized, other tranforms can kick in and optimize the DAG.

Patterns typically look something like (uaddo A, B) / \ Carry Sum | \ | (addcarry *, 0, Z) | / \ Carry | / (addcarry X, *, *)

But numerous variation exist. Our goal is to identify A, B, X and Z and produce a combine with a single path for carry propagation.

First look for a suitable Z. It will present itself in the form of (addcarry Y, 0, Z) or its equivalent (uaddo Y, 1) for Z=true

 (uaddo A, B)
      |
     Sum
      |

(addcarry *, 0, Z)

(addcarry A, 0, Z) | Sum | (uaddo *, B)

Definition at line 2927 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::ISD::ADDCARRY, B, extractBooleanFlip(), flipBoolean(), getAsCarry(), llvm::SelectionDAG::getConstant(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDValue::getResNo(), llvm::SDValue::getValue(), llvm::SDValue::getValueType(), llvm::SDNode::getVTList(), llvm::SDNode::hasAnyUseOfValue(), llvm::isBitwiseNot(), llvm::isNullConstant(), llvm::isOneConstant(), llvm::ISD::SUBCARRY, llvm::ISD::UADDO, X, Y, and llvm::Z.

combineConcatVectorOfExtracts()

static SDValue combineConcatVectorOfExtracts ( SDNode *  N, SelectionDAG &  DAG  )

static

Definition at line 17596 of file DAGCombiner.cpp.

References llvm::AfterLegalizeVectorOps, llvm::all_of(), llvm::ISD::allOperandsUndef(), llvm::SmallVectorImpl< T >::append(), assert(), llvm::EVT::bitsLE(), llvm::ISD::BUILD_VECTOR, combineConcatVectorOfScalars(), llvm::ISD::CONCAT_VECTORS, llvm::dyn_cast(), llvm::ISD::EXTRACT_SUBVECTOR, llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getBuildVector(), llvm::SDValue::getConstantOperandVal(), llvm::SelectionDAG::getContext(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getNumOperands(), llvm::SDNode::getNumOperands(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarType(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::EVT::getVectorVT(), llvm::SDValue::hasOneUse(), llvm::tgtok::In, llvm::EVT::isFloatingPoint(), llvm::EVT::isInteger(), llvm::TargetLoweringBase::isShuffleMaskLegal(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::BitmaskEnumDetail::Mask(), llvm::SDNode::op_begin(), llvm::SDNode::op_end(), llvm::SDNode::ops(), llvm::peekThroughBitcasts(), llvm::peekThroughOneUseBitcasts(), llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorImpl< T >::resize(), llvm::NVPTX::PTXLdStInstCode::Scalar, llvm::ISD::SCALAR_TO_VECTOR, llvm::SmallVectorBase::size(), llvm::ISD::TRUNCATE, and llvm::ISD::UNDEF.

combineConcatVectorOfScalars()

static SDValue combineConcatVectorOfScalars ( SDNode *  N, SelectionDAG &  DAG  )

static

Definition at line 17531 of file DAGCombiner.cpp.

References llvm::SmallVectorTemplateCommon< T >::back(), llvm::ISD::BITCAST, llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getBuildVector(), llvm::SelectionDAG::getContext(), llvm::EVT::getFloatingPointVT(), llvm::EVT::getIntegerVT(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorVT(), llvm::EVT::isFloatingPoint(), llvm::EVT::isInteger(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::SDNode::ops(), llvm::SmallVectorTemplateBase< T >::push_back(), and llvm::ISD::UNDEF.

Referenced by combineConcatVectorOfExtracts().

combineMinNumMaxNum()

static SDValue combineMinNumMaxNum ( const SDLoc &  DL, EVT  VT, SDValue  LHS, SDValue  RHS, SDValue  True, SDValue  False, ISD::CondCode  CC, const TargetLowering &  TLI, SelectionDAG &  DAG  )

static

Generate Min/Max node.

Definition at line 8136 of file DAGCombiner.cpp.

References llvm::ISD::FMAXNUM, llvm::ISD::FMAXNUM_IEEE, llvm::ISD::FMINNUM, llvm::ISD::FMINNUM_IEEE, llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getNode(), llvm::TargetLoweringBase::getTypeToTransformTo(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::ISD::SETGE, llvm::ISD::SETGT, llvm::ISD::SETLE, llvm::ISD::SETLT, llvm::ISD::SETOGE, llvm::ISD::SETOGT, llvm::ISD::SETOLE, llvm::ISD::SETOLT, llvm::ISD::SETUGE, llvm::ISD::SETUGT, llvm::ISD::SETULE, and llvm::ISD::SETULT.

combineShuffleOfScalars()

static SDValue combineShuffleOfScalars ( ShuffleVectorSDNode *  SVN, SelectionDAG &  DAG, const TargetLowering &  TLI  )

static

Definition at line 18316 of file DAGCombiner.cpp.

References llvm::EVT::bitsLT(), llvm::ISD::BUILD_VECTOR, llvm::dyn_cast(), llvm::SelectionDAG::getBuildVector(), llvm::ShuffleVectorSDNode::getMask(), llvm::SDValue::getNode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarType(), llvm::SelectionDAG::getSExtOrTrunc(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getZExtOrTrunc(), llvm::SDNode::hasOneUse(), llvm::SmallSet< T, N, C >::insert(), isAnyConstantBuildVector(), llvm::ISD::isBuildVectorAllZeros(), llvm::EVT::isInteger(), llvm::SDValue::isUndef(), llvm::TargetLoweringBase::isZExtFree(), llvm::SmallVectorTemplateBase< T >::push_back(), and llvm::ISD::SCALAR_TO_VECTOR.

Referenced by simplifyShuffleOfShuffle().

combineShuffleOfSplatVal()

static SDValue combineShuffleOfSplatVal ( ShuffleVectorSDNode *  Shuf, SelectionDAG &  DAG  )

static

Definition at line 18515 of file DAGCombiner.cpp.

References assert(), llvm::dyn_cast(), llvm::ShuffleVectorSDNode::getMask(), llvm::SDNode::getOperand(), llvm::SelectionDAG::getVectorShuffle(), llvm::SDValue::isUndef(), llvm::SmallVectorTemplateBase< T >::push_back(), and llvm::ArrayRef< T >::size().

Referenced by simplifyShuffleOfShuffle().

combineShuffleToVectorExtend()

static SDValue combineShuffleToVectorExtend ( ShuffleVectorSDNode *  SVN, SelectionDAG &  DAG, const TargetLowering &  TLI, bool  LegalOperations  )

static

Definition at line 18397 of file DAGCombiner.cpp.

References llvm::ISD::ANY_EXTEND_VECTOR_INREG, llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::EVT::getIntegerVT(), llvm::ShuffleVectorSDNode::getMask(), llvm::SelectionDAG::getNode(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::EVT::getVectorVT(), llvm::DataLayout::isBigEndian(), llvm::EVT::isInteger(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::TargetLoweringBase::isTypeLegal(), and llvm::BitmaskEnumDetail::Mask().

Referenced by simplifyShuffleOfShuffle().

combineTruncationShuffle()

static SDValue combineTruncationShuffle ( ShuffleVectorSDNode *  SVN, SelectionDAG &  DAG  )

static

Definition at line 18454 of file DAGCombiner.cpp.

References llvm::ISD::ANY_EXTEND_VECTOR_INREG, llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getDataLayout(), llvm::ShuffleVectorSDNode::getMask(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::DataLayout::isBigEndian(), llvm::EVT::isInteger(), llvm::BitmaskEnumDetail::Mask(), llvm::peekThroughBitcasts(), llvm::ISD::SIGN_EXTEND_VECTOR_INREG, and llvm::ISD::ZERO_EXTEND_VECTOR_INREG.

Referenced by simplifyShuffleOfShuffle().

ConvertSelectToConcatVector()

static SDValue ConvertSelectToConcatVector ( SDNode *  N, SelectionDAG &  DAG  )

static

Definition at line 8466 of file DAGCombiner.cpp.

ExtendUsesToFormExtLoad()

static bool ExtendUsesToFormExtLoad ( EVT  VT, SDNode *  N, SDValue  N0, unsigned  ExtOpc, SmallVectorImpl< SDNode *> &  ExtendNodes, const TargetLowering &  TLI  )

static

Definition at line 8917 of file DAGCombiner.cpp.

References llvm::MCID::Add, llvm::ISD::ADD, llvm::AMDGPU::HSAMD::Kernel::Arg::Key::Align, llvm::ISD::AND, llvm::ISD::ANY_EXTEND, assert(), B, llvm::ISD::CONCAT_VECTORS, llvm::ISD::Constant, llvm::ISD::CopyToReg, llvm::ISD::FP_EXTEND, llvm::ISD::FP_ROUND, llvm::MemSDNode::getAAInfo(), llvm::MemSDNode::getAlignment(), llvm::LoadSDNode::getBasePtr(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::LoadSDNode::getExtensionType(), llvm::SelectionDAG::getExtLoad(), llvm::MachineMemOperand::getFlags(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::MemSDNode::getPointerInfo(), llvm::SDValue::getResNo(), llvm::SDUse::getResNo(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::GetSplitDestVTs(), llvm::EVT::getStoreSize(), llvm::SDUse::getUser(), llvm::SDValue::getValue(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::MachinePointerInfo::getWithOffset(), llvm::SDValue::hasOneUse(), hasOneUse(), llvm::LSBaseSDNode::isIndexed(), llvm::TargetLoweringBase::isLoadExtLegal(), llvm::TargetLoweringBase::isLoadExtLegalOrCustom(), llvm::ISD::isNON_EXTLoad(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::EVT::isPow2VectorType(), llvm::ISD::isSignedIntSetCC(), llvm::TargetLoweringBase::isTruncateFree(), llvm::ISD::isUNINDEXEDLoad(), llvm::EVT::isVector(), llvm::TargetLoweringBase::isVectorLoadExtDesirable(), llvm::MemSDNode::isVolatile(), llvm::TargetLoweringBase::isZExtFree(), llvm::ISD::LOAD, llvm::MinAlign(), llvm::ISD::OR, llvm::MVT::Other, llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::ISD::SETCC, llvm::ISD::SEXTLOAD, llvm::ISD::SHL, llvm::ISD::SIGN_EXTEND, llvm::SmallVectorBase::size(), llvm::ISD::SRL, llvm::ISD::TokenFactor, llvm::ISD::TRUNCATE, llvm::SDNode::use_begin(), llvm::SDNode::use_end(), llvm::ISD::VSELECT, llvm::ISD::XOR, llvm::ISD::ZERO_EXTEND, llvm::APInt::zext(), and llvm::ISD::ZEXTLOAD.

Referenced by foldExtendedSignBitTest(), isTruncateOf(), and tryToFoldExtOfLoad().

extractBooleanFlip()

static SDValue extractBooleanFlip ( SDValue  V, SelectionDAG &  DAG, const TargetLowering &  TLI, bool  Force  )

static

Flips a boolean if it is cheaper to compute.

If the Force parameters is set, then the flip also occurs if computing the inverse is the same cost. This function returns an empty SDValue in case it cannot flip the boolean without increasing the cost of the computation. If you want to flip a boolean no matter what, use flipBoolean.

Definition at line 2741 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::ISD::ADDC, llvm::ISD::ADDCARRY, llvm::ISD::ADDE, llvm::ISD::AND, llvm::ISD::CARRY_FALSE, llvm::SelectionDAG::computeOverflowKind(), llvm::dyn_cast(), flipBoolean(), llvm::ConstantSDNode::getAPIntValue(), getAsCarry(), llvm::TargetLoweringBase::getBooleanContents(), llvm::SelectionDAG::getBoolExtOrTrunc(), llvm::SelectionDAG::getConstant(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValue(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::SDNode::getVTList(), llvm::SDNode::hasAnyUseOfValue(), llvm::ConstantSDNode::isAllOnesValue(), llvm::isBitwiseNot(), llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), llvm::isConstOrConstSplat(), llvm::isNullConstant(), llvm::isNullOrNullSplat(), llvm::ConstantSDNode::isOne(), llvm::isOneOrOneSplat(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::EVT::isVector(), llvm::SelectionDAG::OFK_Never, llvm::ISD::SADDO, llvm::ISD::UADDO, llvm::TargetLoweringBase::UndefinedBooleanContent, llvm::ISD::USUBO, llvm::ISD::XOR, Y, llvm::TargetLoweringBase::ZeroOrNegativeOneBooleanContent, and llvm::TargetLoweringBase::ZeroOrOneBooleanContent.

Referenced by combineADDCARRYDiamond().

extractShiftForRotate()

static SDValue extractShiftForRotate ( SelectionDAG &  DAG, SDValue  OppShift, SDValue  ExtractFrom, SDValue &  Mask, const SDLoc &  DL  )

static

Helper function for visitOR to extract the needed side of a rotate idiom from a shl/srl/mul/udiv.

This is meant to handle cases where InstCombine merged some outside op with one of the shifts from the rotate pattern.

Returns

An empty SDValue if the needed shift couldn't be extracted. Otherwise, returns an expansion of ExtractFrom based on the following patterns:

(or (mul v c0) (shrl (mul v c1) c2)): expands (mul v c0) -> (shl (mul v c1) c3)

(or (udiv v c0) (shl (udiv v c1) c2)): expands (udiv v c0) -> (shrl (udiv v c1) c3)

(or (shl v c0) (shrl (shl v c1) c2)): expands (shl v c0) -> (shl (shl v c1) c3)

(or (shrl v c0) (shl (shrl v c1) c2)): expands (shrl v c0) -> (shrl (shrl v c1) c3)

Such that in all cases, c3+c2==bitwidth(op v c1).

Definition at line 5979 of file DAGCombiner.cpp.

References assert(), llvm::ISD::DELETED_NODE, llvm::ConstantSDNode::getAPIntValue(), llvm::APInt::getBitWidth(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getNode(), llvm::APInt::getOneBitSet(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDValue::getValueType(), llvm::APInt::getZExtValue(), llvm::isConstOrConstSplat(), llvm::ISD::MUL, llvm::ISD::SHL, llvm::ISD::SRL, stripConstantMask(), llvm::ISD::UDIV, llvm::APInt::udivrem(), llvm::APInt::ugt(), zeroExtendToMatch(), and llvm::APInt::zextOrTrunc().

Referenced by matchRotateSub().

flipBoolean()

static SDValue flipBoolean ( SDValue  V, const SDLoc &  DL, SelectionDAG &  DAG, const TargetLowering &  TLI  )

static

Definition at line 2716 of file DAGCombiner.cpp.

References llvm::SelectionDAG::getAllOnesConstant(), llvm::TargetLoweringBase::getBooleanContents(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getNode(), llvm::SDValue::getValueType(), llvm::TargetLoweringBase::UndefinedBooleanContent, llvm::ISD::XOR, llvm::TargetLoweringBase::ZeroOrNegativeOneBooleanContent, and llvm::TargetLoweringBase::ZeroOrOneBooleanContent.

Referenced by combineADDCARRYDiamond(), and extractBooleanFlip().

foldAddSubBoolOfMaskedVal()

static SDValue foldAddSubBoolOfMaskedVal ( SDNode *  N, SelectionDAG &  DAG  )

static

Definition at line 2183 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::ISD::AND, assert(), C, llvm::dyn_cast(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SDValue::getValueType(), llvm::SelectionDAG::getZExtOrTrunc(), llvm::MVT::i1, llvm::isNullConstant(), llvm::isOneConstant(), llvm::ISD::SETCC, llvm::ISD::SETEQ, llvm::ISD::SUB, llvm::Z, and llvm::ISD::ZERO_EXTEND.

Referenced by foldAddSubOfSignBit(), and tryFoldToZero().

foldAddSubMasked1()

static SDValue foldAddSubMasked1 ( bool  IsAdd, SDValue  N0, SDValue  N1, SelectionDAG &  DAG, const SDLoc &  DL  )

static

Given the operands of an add/sub operation, see if the 2nd operand is a masked 0/1 whose source operand is actually known to be 0/-1.

If so, invert the opcode and bypass the mask operation.

Definition at line 2592 of file DAGCombiner.cpp.

References llvm::MCID::Add, llvm::ISD::ADD, llvm::ISD::ADDC, llvm::ISD::ADDCARRY, llvm::ISD::AND, llvm::ISD::CARRY_FALSE, llvm::SelectionDAG::ComputeNumSignBits(), llvm::SelectionDAG::computeOverflowKind(), llvm::dyn_cast(), llvm::SelectionDAG::getAllOnesConstant(), getAsCarry(), llvm::TargetLoweringBase::getBooleanContents(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SDValue::getResNo(), llvm::EVT::getScalarSizeInBits(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SDValue::getValueType(), llvm::VTSDNode::getVT(), llvm::SelectionDAG::getVTList(), llvm::SDNode::getVTList(), llvm::MVT::Glue, llvm::SDNode::hasAnyUseOfValue(), llvm::SDValue::hasOneUse(), llvm::MVT::i1, isConstantOrConstantVector(), llvm::isNullConstant(), llvm::isNullOrNullSplat(), llvm::isOneOrOneSplat(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::SelectionDAG::OFK_Never, llvm::TargetLoweringBase::preferIncOfAddToSubOfNot(), llvm::ISD::SHL, llvm::ISD::SIGN_EXTEND, llvm::ISD::SIGN_EXTEND_INREG, llvm::ISD::SUB, llvm::ISD::XOR, llvm::ISD::ZERO_EXTEND, and llvm::TargetLoweringBase::ZeroOrOneBooleanContent.

Referenced by tryFoldToZero().

foldAddSubOfSignBit()

static SDValue foldAddSubOfSignBit ( SDNode *  N, SelectionDAG &  DAG  )

static

Try to fold a 'not' shifted sign-bit with add/sub with constant operand into a shift and add with a different constant.

Definition at line 2224 of file DAGCombiner.cpp.

References llvm::MCID::Add, llvm::ISD::ADD, assert(), C, llvm::SelectionDAG::computeOverflowKind(), foldAddSubBoolOfMaskedVal(), llvm::SelectionDAG::FoldConstantArithmetic(), llvm::SelectionDAG::getAllOnesConstant(), llvm::ConstantSDNode::getAPIntValue(), llvm::SelectionDAG::getConstant(), llvm::SDNode::getFlags(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SelectionDAG::getNOT(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDValue::hasOneUse(), llvm::SelectionDAG::haveNoCommonBitsSet(), llvm::isAllOnesOrAllOnesSplat(), llvm::isBitwiseNot(), llvm::ISD::isBuildVectorAllZeros(), llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), isConstantOrConstantVector(), llvm::isConstOrConstSplat(), llvm::isNullConstant(), llvm::isNullOrNullSplat(), llvm::isOneOrOneSplat(), llvm::TargetLoweringBase::isOperationLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::ISD::matchBinaryPredicate(), llvm::SelectionDAG::OFK_Never, llvm::ISD::OR, llvm::TargetLoweringBase::preferIncOfAddToSubOfNot(), llvm::ISD::SADDO, llvm::ISD::SIGN_EXTEND, llvm::ISD::SRA, llvm::ISD::SRL, llvm::ISD::SUB, llvm::ISD::UADDO, llvm::ISD::UADDSAT, llvm::ISD::UMAX, llvm::ISD::USUBSAT, X, llvm::ISD::XOR, and llvm::ISD::ZERO_EXTEND.

Referenced by tryFoldToZero().

foldBitcastedFPLogic()

static SDValue foldBitcastedFPLogic ( SDNode *  N, SelectionDAG &  DAG, const TargetLowering &  TLI  )

static

Definition at line 10767 of file DAGCombiner.cpp.

References llvm::AfterLegalizeDAG, llvm::ISD::AND, llvm::SmallVectorImpl< T >::append(), assert(), llvm::SmallVectorTemplateCommon< T >::back(), llvm::ISD::BITCAST, llvm::ISD::BUILD_PAIR, llvm::ISD::BUILD_VECTOR, C, llvm::ShuffleVectorSDNode::commuteMask(), llvm::ISD::Constant, llvm::ISD::ConstantFP, llvm::ISD::EXTRACT_ELEMENT, llvm::ISD::FABS, llvm::ISD::FCOPYSIGN, llvm::ISD::FNEG, llvm::MemSDNode::getAAInfo(), llvm::MemSDNode::getAlignment(), llvm::ConstantSDNode::getAPIntValue(), llvm::LoadSDNode::getBasePtr(), llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getBuildVector(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::MachineMemOperand::getFlags(), llvm::EVT::getIntegerVT(), llvm::SelectionDAG::getIntPtrConstant(), llvm::ShuffleVectorSDNode::getMask(), llvm::MemSDNode::getMemOperand(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDNode::getNumOperands(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::MemSDNode::getPointerInfo(), getPPCf128HiElementSelector(), llvm::EVT::getScalarSizeInBits(), llvm::APInt::getSignMask(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValue(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::EVT::getVectorVT(), llvm::TargetLoweringBase::hasBigEndianPartOrdering(), llvm::TargetLoweringBase::hasBitPreservingFPLogic(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::MipsISD::Hi, llvm::MVT::i64, llvm::DataLayout::isBigEndian(), llvm::ISD::isBuildVectorOfConstantFPSDNodes(), llvm::ISD::isBuildVectorOfConstantSDNodes(), isConstant(), llvm::isConstOrConstSplat(), llvm::TargetLoweringBase::isFAbsFree(), llvm::EVT::isFloatingPoint(), llvm::TargetLoweringBase::isFNegFree(), llvm::EVT::isInteger(), llvm::DataLayout::isLittleEndian(), llvm::TargetLoweringBase::isLoadBitCastBeneficial(), llvm::ISD::isNormalLoad(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isShuffleMaskLegal(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), isVolatile(), llvm::SPII::Load, llvm::ISD::LOAD, llvm::APInt::lshrInPlace(), N, llvm::SDNode::op_values(), llvm::ISD::OR, llvm::MVT::ppcf128, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorTemplateBase< T >::push_back(), llvm::reverse(), llvm::ISD::SIGN_EXTEND, llvm::SmallVectorBase::size(), llvm::ISD::SRL, std::swap(), llvm::APInt::trunc(), llvm::ISD::TRUNCATE, llvm::ISD::VECTOR_SHUFFLE, X, llvm::ISD::XOR, llvm::APInt::zext(), and llvm::APInt::zextOrTrunc().

foldExtendedSignBitTest()

static SDValue foldExtendedSignBitTest ( SDNode *  N, SelectionDAG &  DAG, bool  LegalOperations  )

static

Definition at line 9290 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::ISD::AND, llvm::ISD::ANY_EXTEND, assert(), llvm::EVT::changeVectorElementTypeToInteger(), llvm::SelectionDAG::ComputeNumSignBits(), llvm::ISD::Constant, llvm::TargetLoweringBase::convertSelectOfConstantsToMath(), ExtendUsesToFormExtLoad(), llvm::SelectionDAG::getAllOnesConstant(), llvm::LoadSDNode::getBasePtr(), llvm::SelectionDAG::getBoolConstant(), llvm::TargetLoweringBase::getBooleanContents(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::LoadSDNode::getExtensionType(), llvm::SelectionDAG::getExtLoad(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SelectionDAG::getNOT(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SelectionDAG::getSelect(), llvm::SelectionDAG::getSetCC(), llvm::SelectionDAG::getSExtOrTrunc(), llvm::EVT::getSizeInBits(), llvm::SDValue::getValue(), llvm::SDValue::getValueType(), llvm::SelectionDAG::getValueType(), llvm::SDNode::getValueType(), llvm::SelectionDAG::getZExtOrTrunc(), llvm::SDValue::hasOneUse(), llvm::MVT::i1, llvm::isAllOnesConstant(), llvm::isAllOnesOrAllOnesSplat(), llvm::TargetLoweringBase::isLoadExtLegal(), llvm::isNullOrNullSplat(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::LSBaseSDNode::isUnindexed(), llvm::EVT::isVector(), llvm::ISD::OR, llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::ISD::SETCC, llvm::ISD::SETGT, llvm::APInt::sext(), llvm::ISD::SEXTLOAD, llvm::ISD::SIGN_EXTEND, llvm::ISD::SIGN_EXTEND_INREG, llvm::SelectionDAG::SignBitIsZero(), llvm::ISD::SRA, llvm::ISD::SRL, llvm::ISD::SUB, llvm::ISD::TRUNCATE, tryToFoldExtendOfConstant(), tryToFoldExtOfExtload(), tryToFoldExtOfLoad(), X, llvm::ISD::XOR, llvm::ISD::ZERO_EXTEND, llvm::TargetLoweringBase::ZeroOrNegativeOneBooleanContent, and llvm::ISD::ZEXTLOAD.

Referenced by isTruncateOf().

foldFPToIntToFP()

static SDValue foldFPToIntToFP ( SDNode *  N, SelectionDAG &  DAG, const TargetLowering &  TLI  )

static

Definition at line 12659 of file DAGCombiner.cpp.

References llvm::ISD::ConstantFP, llvm::StringRef::equals(), F(), llvm::ISD::FP_TO_SINT, llvm::ISD::FP_TO_UINT, llvm::ISD::FTRUNC, llvm::SelectionDAG::getConstantFP(), llvm::Function::getFnAttribute(), llvm::MachineFunction::getFunction(), llvm::SelectionDAG::getMachineFunction(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SelectionDAG::getTarget(), llvm::Attribute::getValueAsString(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::MVT::i1, llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::TargetOptions::NoSignedZerosFPMath, llvm::TargetMachine::Options, llvm::ISD::SELECT_CC, llvm::ISD::SETCC, llvm::SelectionDAG::SignBitIsZero(), llvm::ISD::SINT_TO_FP, llvm::ISD::UINT_TO_FP, and llvm::ISD::ZERO_EXTEND.

FoldIntToFPToInt()

static SDValue FoldIntToFPToInt ( SDNode *  N, SelectionDAG &  DAG  )

static

Definition at line 12802 of file DAGCombiner.cpp.

References llvm::AfterLegalizeDAG, llvm::ISD::BITCAST, llvm::EVT::bitsLT(), llvm::APFloat::changeSign(), llvm::ISD::ConstantFP, llvm::dyn_cast(), llvm::SelectionDAG::EVTToAPFloatSemantics(), llvm::ISD::EXTLOAD, llvm::MVT::f16, llvm::MVT::f80, llvm::ISD::FCEIL, llvm::ISD::FCOPYSIGN, llvm::ISD::FFLOOR, llvm::ISD::FMUL, llvm::ISD::FNEARBYINT, llvm::ISD::FNEG, llvm::ISD::FP16_TO_FP, llvm::ISD::FP_EXTEND, llvm::ISD::FP_ROUND, llvm::ISD::FP_TO_SINT, llvm::ISD::FP_TO_UINT, llvm::ISD::FRINT, llvm::ISD::FTRUNC, llvm::LoadSDNode::getBasePtr(), llvm::SelectionDAG::getBitcast(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getConstantFP(), llvm::ConstantFPSDNode::getConstantFPValue(), llvm::SDValue::getConstantOperandVal(), llvm::SDNode::getConstantOperandVal(), llvm::SelectionDAG::getExtLoad(), llvm::SDNode::getFlags(), llvm::SelectionDAG::getIntPtrConstant(), llvm::MemSDNode::getMemOperand(), GetNegatedExpression(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::TargetLoweringBase::getOperationAction(), llvm::EVT::getScalarSizeInBits(), llvm::SDValue::getScalarValueSizeInBits(), llvm::APInt::getSignMask(), llvm::EVT::getSizeInBits(), llvm::APInt::getSplat(), llvm::SelectionDAG::getTarget(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValue(), llvm::ConstantFPSDNode::getValueAPF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::tgtok::In, isConstantFPBuildVectorOrConstantFP(), llvm::TargetLoweringBase::isFNegFree(), llvm::TargetLoweringBase::isFPImmLegal(), llvm::EVT::isInteger(), llvm::TargetLoweringBase::isLoadExtLegal(), isNegatibleForFree(), llvm::ISD::isNormalLoad(), llvm::TargetLoweringBase::isOperationLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::TargetLoweringBase::Legal, llvm::TargetMachine::Options, llvm::APFloatBase::semanticsPrecision(), llvm::ISD::SIGN_EXTEND, llvm::ISD::SINT_TO_FP, llvm::ISD::TRUNCATE, llvm::ISD::UINT_TO_FP, llvm::TargetOptions::UnsafeFPMath, llvm::SDNode::use_begin(), llvm::ISD::XOR, and llvm::ISD::ZERO_EXTEND.

foldShuffleOfConcatUndefs()

static SDValue foldShuffleOfConcatUndefs ( ShuffleVectorSDNode *  Shuf, SelectionDAG &  DAG  )

static

Try to convert a wide shuffle of concatenated vectors into 2 narrow shuffles followed by concatenation.

Narrow vector ops may have better performance than wide ops, and this can unlock further narrowing of other vector ops. Targets can invert this transform later if it is not profitable.

Definition at line 18192 of file DAGCombiner.cpp.

References llvm::ISD::CONCAT_VECTORS, llvm::SelectionDAG::getContext(), llvm::ShuffleVectorSDNode::getMask(), llvm::SelectionDAG::getNode(), llvm::SDValue::getNumOperands(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarType(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::EVT::getVectorVT(), llvm::TargetLoweringBase::isShuffleMaskLegal(), llvm::SDValue::isUndef(), X, and Y.

Referenced by simplifyShuffleOfShuffle().

getAsCarry()

static SDValue getAsCarry ( const TargetLowering &  TLI, SDValue  V  )

static

Definition at line 2547 of file DAGCombiner.cpp.

References llvm::ISD::ADDCARRY, llvm::ISD::AND, llvm::TargetLoweringBase::getBooleanContents(), llvm::SDValue::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDValue::getResNo(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::isOneConstant(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::ISD::SUBCARRY, llvm::ISD::TRUNCATE, llvm::ISD::UADDO, llvm::ISD::USUBO, llvm::ISD::ZERO_EXTEND, and llvm::TargetLoweringBase::ZeroOrOneBooleanContent.

Referenced by combineADDCARRYDiamond(), extractBooleanFlip(), and foldAddSubMasked1().

getAsNonOpaqueConstant()

static ConstantSDNode* getAsNonOpaqueConstant ( SDValue  N )

static

If N is a ConstantSDNode with isOpaque() == false return it casted to a ConstantSDNode pointer else nullptr.

Definition at line 2100 of file DAGCombiner.cpp.

References llvm::ISD::AND, assert(), llvm::dyn_cast(), llvm::SDNode::getFlags(), llvm::SelectionDAG::getNode(), llvm::SDNode::getNumValues(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SelectionDAG::getSelect(), llvm::SDValue::getValueType(), llvm::SDValue::hasOneUse(), llvm::isAllOnesOrAllOnesSplat(), llvm::TargetLoweringBase::isBinOp(), isConstantFPBuildVectorOrConstantFP(), isConstantOrConstantVector(), llvm::isNullOrNullSplat(), llvm::ConstantSDNode::isOpaque(), llvm::SDValue::isUndef(), N, llvm::ISD::OR, llvm::ISD::SELECT, and llvm::SDNode::setFlags().

Referenced by isBSwapHWordElement(), simplifyDivRem(), simplifyShuffleOfShuffle(), stripTruncAndExt(), tryFoldToZero(), and visitORCommutative().

getBuildPairElt()

static SDNode* getBuildPairElt ( SDNode *  N, unsigned  i  )

static

Definition at line 10720 of file DAGCombiner.cpp.

References llvm::AMDGPU::HSAMD::Kernel::Arg::Key::Align, llvm::SelectionDAG::areNonVolatileConsecutiveLoads(), assert(), llvm::ISD::BUILD_PAIR, llvm::dyn_cast(), llvm::DataLayout::getABITypeAlignment(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::SelectionDAG::getLoad(), llvm::SDValue::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SDValue::getResNo(), llvm::EVT::getStoreSize(), llvm::EVT::getTypeForEVT(), llvm::DataLayout::isBigEndian(), llvm::ISD::isNON_EXTLoad(), llvm::TargetLoweringBase::isOperationLegal(), llvm::ISD::LOAD, llvm::ISD::MERGE_VALUES, and std::swap().

getInputChainForNode()

static SDValue getInputChainForNode ( SDNode *  N )

static

Given a node, return its input chain if it has one, otherwise return a null sd operand.

Definition at line 1881 of file DAGCombiner.cpp.

References assert(), llvm::ISD::CopyFromReg, llvm::ISD::CopyToReg, llvm::SmallPtrSetImpl< PtrType >::count(), llvm::SmallVectorTemplateCommon< T >::data(), llvm::SmallVectorImpl< T >::emplace_back(), llvm::ISD::EntryToken, llvm::SelectionDAG::getEntryNode(), llvm::SDValue::getNode(), llvm::SDNode::getNumOperands(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDNode::getOperand(), llvm::SelectionDAG::getTokenFactor(), llvm::SDValue::getValueType(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::is_contained(), llvm::ISD::LIFETIME_END, llvm::ISD::LIFETIME_START, LLVM_FALLTHROUGH, llvm::CodeGenOpt::None, llvm::SDNode::op_values(), llvm::MVT::Other, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SelectionDAG::ReplaceAllUsesWith(), llvm::SmallVectorImpl< T >::resize(), second, llvm::SmallVectorBase::size(), llvm::ISD::TokenFactor, TokenFactorInlineLimit, llvm::SDNode::use_begin(), and llvm::SDNode::use_empty().

GetNegatedExpression()

static SDValue GetNegatedExpression ( SDValue  Op, SelectionDAG &  DAG, bool  LegalOperations, bool  ForCodeSize, unsigned  Depth = 0  )

static

If isNegatibleForFree returns true, return the newly negated expression.

Definition at line 888 of file DAGCombiner.cpp.

References assert(), llvm::ISD::BUILD_VECTOR, C, llvm::APFloat::changeSign(), llvm::ISD::ConstantFP, llvm::Depth, llvm::ISD::FADD, llvm::ISD::FDIV, llvm::ISD::FMUL, llvm::ISD::FNEG, llvm::ISD::FP_EXTEND, llvm::ISD::FP_ROUND, llvm::ISD::FSIN, llvm::ISD::FSUB, llvm::SelectionDAG::getBuildVector(), llvm::SelectionDAG::getConstantFP(), llvm::SDNode::getFlags(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SelectionDAG::getTarget(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SDValue::getValueType(), llvm::SDNodeFlags::hasNoSignedZeros(), llvm::isConstOrConstSplatFP(), isNegatibleForFree(), llvm_unreachable, llvm::TargetOptions::NoSignedZerosFPMath, llvm::SDNode::op_values(), llvm::TargetMachine::Options, and llvm::SmallVectorTemplateBase< T >::push_back().

Referenced by FoldIntToFPToInt(), and isContractable().

getPPCf128HiElementSelector()

static unsigned getPPCf128HiElementSelector ( const SelectionDAG &  DAG )

static

Definition at line 10761 of file DAGCombiner.cpp.

References llvm::SelectionDAG::getDataLayout(), and llvm::DataLayout::isBigEndian().

Referenced by foldBitcastedFPLogic().

getShuffleMaskIndexOfOneElementFromOp0IntoOp1()

static int getShuffleMaskIndexOfOneElementFromOp0IntoOp1 ( ArrayRef< int >  Mask )

static

If the shuffle mask is taking exactly one element from the first vector operand and passing through all other elements from the second vector operand, return the index of the mask element that is choosing an element from the first operand.

Otherwise, return -1.

Definition at line 18569 of file DAGCombiner.cpp.

References llvm::ArrayRef< T >::size().

Referenced by replaceShuffleOfInsert().

getSubVectorSrc()

static SDValue getSubVectorSrc ( SDValue  V, SDValue  Index, EVT  SubVT  )

static

Definition at line 17847 of file DAGCombiner.cpp.

References llvm::ISD::CONCAT_VECTORS, llvm::dyn_cast(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDValue::getValueType(), llvm::EVT::getVectorNumElements(), llvm::ConstantSDNode::getZExtValue(), and llvm::ISD::INSERT_SUBVECTOR.

Referenced by narrowInsertExtractVectorBinOp().

isAnyConstantBuildVector()

static bool isAnyConstantBuildVector ( SDValue  V, bool  NoOpaques = false  )

static

Definition at line 1062 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::ISD::BUILD_VECTOR, llvm::dyn_cast(), llvm::APInt::getBitWidth(), llvm::SDValue::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::APInt::getSExtValue(), llvm::SDValue::hasOneUse(), llvm::ISD::isBuildVectorOfConstantFPSDNodes(), and isConstantOrConstantVector().

Referenced by combineShuffleOfScalars(), and scalarizeExtractedBinop().

isBigEndian()

static Optional<bool> isBigEndian ( const SmallVector< int64_t, 4 > &  ByteOffsets, int64_t  FirstOffset  )

static

Definition at line 6497 of file DAGCombiner.cpp.

References assert(), BigEndianByteAt(), LittleEndianByteAt(), llvm::None, and llvm::SmallVectorBase::size().

Referenced by collectInsertionElements(), createGPRPairNode(), PerformSTORECombine(), ReplaceCMP_SWAP_64Results(), and stripTruncAndExt().

isBSwapHWordElement()

static bool isBSwapHWordElement ( SDValue  N, MutableArrayRef< SDNode *>  Parts  )

static

Return true if the specified node is an element that makes up a 32-bit packed halfword byteswap.

((x & 0x000000ff) << 8) | ((x & 0x0000ff00) >> 8) | ((x & 0x00ff0000) << 8) | ((x & 0xff000000) >> 8)

Definition at line 5532 of file DAGCombiner.cpp.

References llvm::ISD::AND, llvm::ISD::BSWAP, C, llvm::dyn_cast(), llvm::SelectionDAG::getAllOnesConstant(), getAsNonOpaqueConstant(), llvm::SelectionDAG::getConstant(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getNumOperands(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::ConstantSDNode::getZExtValue(), llvm::SDNode::hasOneUse(), llvm::MVT::i32, llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::SDValue::isUndef(), llvm::SelectionDAG::MaskedValueIsZero(), llvm::ISD::OR, llvm::ISD::ROTL, llvm::ISD::ROTR, llvm::ISD::SHL, llvm::ISD::SRL, and X.

isConstantFPBuildVectorOrConstantFP()

static SDNode* isConstantFPBuildVectorOrConstantFP ( SDValue  N )

static

Definition at line 1032 of file DAGCombiner.cpp.

References llvm::SDValue::getNode(), and llvm::ISD::isBuildVectorOfConstantFPSDNodes().

Referenced by CanCombineFCOPYSIGN_EXTEND_ROUND(), FoldIntToFPToInt(), getAsNonOpaqueConstant(), llvm::SelectionDAG::isConstantValueOfAnyType(), isContractable(), and visitFMinMax().

isConstantOrConstantVector()

static bool isConstantOrConstantVector ( SDValue  N, bool  NoOpaques = false  )

static

Definition at line 1043 of file DAGCombiner.cpp.

References llvm::ISD::BUILD_VECTOR, llvm::dyn_cast(), llvm::ConstantSDNode::getAPIntValue(), llvm::APInt::getBitWidth(), llvm::SDValue::getOpcode(), llvm::SDValue::getScalarValueSizeInBits(), llvm::ConstantSDNode::isOpaque(), llvm::SDValue::isUndef(), and llvm::SDNode::op_values().

Referenced by foldAddSubMasked1(), foldAddSubOfSignBit(), getAsNonOpaqueConstant(), isAnyConstantBuildVector(), simplifyDivRem(), stripTruncAndExt(), and tryFoldToZero().

isContractable()

static bool isContractable ( SDNode *  N )

static

Definition at line 11193 of file DAGCombiner.cpp.

References llvm::MCID::Add, llvm::AfterLegalizeDAG, Aggressive, llvm::TargetOptions::AllowFPOpFusion, assert(), B, C, llvm::TargetLoweringBase::enableAggressiveFMAFusion(), F(), llvm::ISD::FABS, llvm::ISD::FADD, llvm::FPOpFusion::Fast, llvm::ISD::FMA, llvm::ISD::FMAD, llvm::ISD::FMUL, llvm::ISD::FNEG, llvm::ISD::FP_EXTEND, llvm::ISD::FSUB, llvm::SelectionDAGTargetInfo::generateFMAsInMachineCombiner(), llvm::SelectionDAG::getConstantFP(), llvm::SDNode::getFlags(), GetNegatedExpression(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::TargetSubtargetInfo::getSelectionDAGInfo(), llvm::SelectionDAG::getSubtarget(), llvm::SelectionDAG::getTarget(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::SDNodeFlags::hasAllowContract(), llvm::SDNodeFlags::hasAllowReassociation(), llvm::SDNodeFlags::hasNoNaNs(), llvm::SDNodeFlags::hasNoSignedZeros(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), isConstantFPBuildVectorOrConstantFP(), llvm::isConstOrConstSplatFP(), llvm::ConstantFPSDNode::isExactlyValue(), llvm::TargetLoweringBase::isFMAFasterThanFMulAndFAdd(), llvm::TargetLoweringBase::isFPExtFoldable(), isNegatibleForFree(), llvm::ConstantFPSDNode::isNegative(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::EVT::isVector(), llvm::ConstantFPSDNode::isZero(), N, llvm::TargetOptions::NoNaNsFPMath, llvm::TargetOptions::NoSignedZerosFPMath, llvm::TargetMachine::Options, llvm::MCID::Select, llvm::ISD::SELECT, std::swap(), llvm::TargetOptions::UnsafeFPMath, llvm::SDNode::use_size(), X, Y, and llvm::Z.

isDivRemLibcallAvailable()

static bool isDivRemLibcallAvailable ( SDNode *  Node, bool  isSigned, const TargetLowering &  TLI  )

static

Return true if divmod libcall is available.

Definition at line 3664 of file DAGCombiner.cpp.

isLegalToCombineMinNumMaxNum()

static bool isLegalToCombineMinNumMaxNum ( SelectionDAG &  DAG, SDValue  LHS, SDValue  RHS, const TargetLowering &  TLI  )

static

Definition at line 8124 of file DAGCombiner.cpp.

References llvm::SelectionDAG::getTarget(), llvm::SDValue::getValueType(), llvm::EVT::isFloatingPoint(), llvm::SelectionDAG::isKnownNeverNaN(), llvm::TargetLoweringBase::isProfitableToCombineMinNumMaxNum(), llvm::TargetOptions::NoSignedZerosFPMath, and llvm::TargetMachine::Options.

isNegatibleForFree()

static char isNegatibleForFree ( SDValue  Op, bool  LegalOperations, const TargetLowering &  TLI, const TargetOptions *  Options, bool  ForCodeSize, unsigned  Depth = 0  )

static

Return 1 if we can compute the negated form of the specified expression for the same cost as the expression itself, or 2 if we can compute the negated form more cheaply than the expression itself.

Definition at line 791 of file DAGCombiner.cpp.

References llvm::all_of(), llvm::any_of(), llvm::ISD::BUILD_VECTOR, C, llvm::ISD::ConstantFP, llvm::Depth, llvm::ISD::FADD, llvm::ISD::FDIV, llvm::ISD::FMUL, llvm::ISD::FNEG, llvm::ISD::FP_EXTEND, llvm::ISD::FP_ROUND, llvm::ISD::FSIN, llvm::ISD::FSUB, llvm::SDNode::getFlags(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDValue::getValueType(), llvm::SDNodeFlags::hasNoSignedZeros(), llvm::SDValue::hasOneUse(), llvm::isConstOrConstSplatFP(), llvm::TargetLoweringBase::isFPExtFree(), llvm::TargetLoweringBase::isFPImmLegal(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::SDNode::isUndef(), N, llvm::neg(), llvm::TargetOptions::NoSignedZerosFPMath, and llvm::SDNode::op_values().

Referenced by FoldIntToFPToInt(), GetNegatedExpression(), and isContractable().

isSlicingProfitable()

static bool isSlicingProfitable ( SmallVectorImpl< LoadedSlice > &  LoadedSlices, const APInt &  UsedBits, bool  ForCodeSize  )

static

Check the profitability of all involved LoadedSlice.

Currently, it is considered profitable if there is exactly two involved slices (1) which are (2) next to each other in memory, and whose cost (

See also

LoadedSlice::Cost) is smaller than the original load (3).

Note: The order of the elements in LoadedSlices may be modified, but not the elements themselves.

FIXME: When the cost model will be mature enough, we can relax constraints (1) and (2).

Definition at line 14450 of file DAGCombiner.cpp.

References adjustCostForPairing(), llvm::AfterLegalizeDAG, areUsedBitsDense(), assert(), llvm::SDNode::getConstantOperandVal(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SDValue::getValue(), llvm::SDNode::getValueSizeInBits(), llvm::SDNode::getValueType(), llvm::SDNode::hasOneUse(), llvm::EVT::isInteger(), llvm::ISD::isNormalLoad(), llvm::isPowerOf2_32(), llvm::MemSDNode::isVolatile(), llvm::ISD::LOAD, llvm::AArch64CC::LS, N, llvm::MVT::Other, llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::SmallVectorBase::size(), llvm::ISD::SRL, StressLoadSlicing, llvm::ISD::TokenFactor, llvm::ISD::TRUNCATE, llvm::SDNode::use_begin(), and llvm::SDNode::use_end().

isTruncateOf()

static bool isTruncateOf ( SelectionDAG &  DAG, SDValue  N, SDValue &  Op, KnownBits &  Known  )

static

Definition at line 9553 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::ISD::AND, llvm::ISD::ANY_EXTEND, llvm::ISD::ANY_EXTEND_VECTOR_INREG, assert(), llvm::ISD::AssertSext, llvm::ISD::AssertZext, llvm::EVT::bitsGT(), llvm::EVT::bitsLE(), llvm::EVT::bitsLT(), C, llvm::EVT::changeVectorElementTypeToInteger(), llvm::SelectionDAG::computeKnownBits(), llvm::SelectionDAG::ComputeNumSignBits(), llvm::ISD::Constant, llvm::APInt::countTrailingOnes(), llvm::APInt::countTrailingZeros(), llvm::dyn_cast(), ExtendUsesToFormExtLoad(), llvm::ISD::EXTLOAD, llvm::ISD::EXTRACT_VECTOR_ELT, foldExtendedSignBitTest(), llvm::MemSDNode::getAAInfo(), llvm::MemSDNode::getAlignment(), llvm::SelectionDAG::getAnyExtOrTrunc(), llvm::ConstantSDNode::getAPIntValue(), llvm::LoadSDNode::getBasePtr(), llvm::SelectionDAG::getBitcast(), llvm::APInt::getBitsSet(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::LoadSDNode::getExtensionType(), llvm::SelectionDAG::getExtLoad(), llvm::MachineMemOperand::getFlags(), llvm::EVT::getIntegerVT(), llvm::SelectionDAG::getLoad(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::APInt::getOneBitSet(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::MemSDNode::getPointerInfo(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SelectionDAG::getSetCC(), llvm::SelectionDAG::getSExtOrTrunc(), llvm::EVT::getSizeInBits(), llvm::EVT::getStoreSizeInBits(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValue(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SelectionDAG::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::TargetLoweringBase::getVectorIdxTy(), llvm::EVT::getVectorNumElements(), llvm::EVT::getVectorVT(), llvm::MachinePointerInfo::getWithOffset(), llvm::SelectionDAG::getZeroExtendInReg(), llvm::SelectionDAG::getZExtOrTrunc(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::MVT::i1, llvm::MVT::i32, llvm::DataLayout::isBigEndian(), llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), llvm::ISD::isEXTLoad(), llvm::DataLayout::isLittleEndian(), llvm::TargetLoweringBase::isLoadExtLegal(), llvm::APInt::isMask(), llvm::TargetLoweringBase::isNarrowingProfitable(), llvm::ISD::isNON_EXTLoad(), llvm::isNullOrNullSplat(), llvm::TargetLoweringBase::isOperationLegal(), llvm::APInt::isShiftedMask(), llvm::APInt::isSubsetOf(), llvm::TargetLoweringBase::isTruncateFree(), llvm::isUIntN(), llvm::SDValue::isUndef(), llvm::LSBaseSDNode::isUnindexed(), llvm::ISD::isUNINDEXEDLoad(), llvm::EVT::isVector(), isVolatile(), llvm::TargetLoweringBase::isZExtFree(), llvm::ISD::isZEXTLoad(), llvm::SPII::Load, llvm::ISD::LOAD, llvm::APInt::lshr(), llvm::SelectionDAG::MaskedValueIsZero(), llvm::MinAlign(), N, llvm::ISD::NON_EXTLOAD, llvm::ISD::OR, llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::ISD::SELECT, llvm::ISD::SETCC, llvm::ISD::SETNE, llvm::SDNodeFlags::setNoUnsignedWrap(), llvm::ISD::SEXTLOAD, llvm::ISD::SHL, llvm::ISD::SIGN_EXTEND, llvm::ISD::SIGN_EXTEND_INREG, llvm::ISD::SIGN_EXTEND_VECTOR_INREG, llvm::ISD::SRA, llvm::ISD::SRL, llvm::SelectionDAG::transferDbgValues(), llvm::ISD::TRUNCATE, tryToFoldExtendOfConstant(), tryToFoldExtOfExtload(), tryToFoldExtOfLoad(), llvm::SDNode::use_begin(), X, llvm::ISD::XOR, llvm::KnownBits::Zero, llvm::ISD::ZERO_EXTEND, llvm::ISD::ZERO_EXTEND_VECTOR_INREG, llvm::APInt::zext(), and llvm::ISD::ZEXTLOAD.

LittleEndianByteAt()

static unsigned LittleEndianByteAt ( unsigned  BW, unsigned  i  )

static

Definition at line 6486 of file DAGCombiner.cpp.

Referenced by isBigEndian(), and stripTruncAndExt().

matchRotateHalf()

static bool matchRotateHalf ( SelectionDAG &  DAG, SDValue  Op, SDValue &  Shift, SDValue &  Mask  )

static

Match "(X shl/srl V1) & V2" where V2 may not be present.

Definition at line 5948 of file DAGCombiner.cpp.

References llvm::SDValue::getOpcode(), llvm::ISD::SHL, llvm::ISD::SRL, and stripConstantMask().

Referenced by matchRotateSub().

matchRotateSub()

static bool matchRotateSub ( SDValue  Pos, SDValue  Neg, unsigned  EltSize, SelectionDAG &  DAG  )

static

Definition at line 6081 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::ISD::AND, llvm::ISD::ANY_EXTEND, assert(), llvm::tgtok::Bits, llvm::SelectionDAG::computeKnownBits(), llvm::countTrailingOnes(), extractShiftForRotate(), llvm::SelectionDAG::getAllOnesConstant(), llvm::ConstantSDNode::getAPIntValue(), llvm::APInt::getLoBits(), getMemory(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDValue::getValueType(), llvm::isConstOrConstSplat(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::isPowerOf2_64(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SPII::Load, llvm::Log2_64(), llvm::ISD::matchBinaryPredicate(), matchRotateHalf(), llvm::operator==(), llvm::ISD::OR, Other, llvm::ISD::ROTL, llvm::ISD::ROTR, llvm::ISD::SHL, llvm::ISD::SIGN_EXTEND, llvm::ISD::SRL, llvm::ISD::SUB, std::swap(), llvm::ISD::TRUNCATE, llvm::KnownBits::Zero, and llvm::ISD::ZERO_EXTEND.

narrowExtractedVectorBinOp()

static SDValue narrowExtractedVectorBinOp ( SDNode *  Extract, SelectionDAG &  DAG  )

static

If we are extracting a subvector produced by a wide binary operator try to use a narrow binary operator and/or avoid concatenation and extraction.

Definition at line 17898 of file DAGCombiner.cpp.

References llvm::ISD::AND, assert(), llvm::ISD::CONCAT_VECTORS, llvm::dyn_cast(), llvm::ISD::EXTRACT_SUBVECTOR, llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), llvm::SDNode::getFlags(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDNode::getNumValues(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarType(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::EVT::getVectorVT(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::TargetLoweringBase::isBinOp(), llvm::TargetLoweringBase::isExtractSubvectorCheap(), llvm::TargetLoweringBase::isOperationLegalOrCustomOrPromote(), llvm::EVT::isVector(), narrowInsertExtractVectorBinOp(), llvm::ISD::OR, llvm::peekThroughBitcasts(), X, llvm::ISD::XOR, and Y.

Referenced by narrowExtractedVectorLoad().

narrowExtractedVectorLoad()

static SDValue narrowExtractedVectorLoad ( SDNode *  Extract, SelectionDAG &  DAG  )

static

If we are extracting a subvector from a wide vector load, convert to a narrow load to eliminate the extraction: (extract_subvector (load wide vector)) –> (load narrow vector)

Definition at line 18017 of file DAGCombiner.cpp.

References llvm::AfterLegalizeDAG, assert(), llvm::ISD::BITCAST, llvm::EVT::bitsEq(), llvm::ISD::BUILD_VECTOR, llvm::ISD::CONCAT_VECTORS, llvm::dyn_cast(), llvm::ISD::EXTRACT_SUBVECTOR, llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getBuildVector(), llvm::SDValue::getConstantOperandVal(), llvm::SDNode::getConstantOperandVal(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::SelectionDAG::getIntPtrConstant(), llvm::SelectionDAG::getLoad(), llvm::SelectionDAG::getMachineFunction(), llvm::MachineFunction::getMachineMemOperand(), llvm::SelectionDAG::getMemBasePlusOffset(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::EVT::getSizeInBits(), llvm::EVT::getStoreSize(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::EVT::getVectorNumElements(), llvm::EVT::getVectorVT(), llvm::SDValue::hasOneUse(), llvm::ISD::INSERT_SUBVECTOR, llvm::DataLayout::isBigEndian(), llvm::TargetLoweringBase::isExtractSubvectorCheap(), llvm::isNullConstant(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::TargetLoweringBase::isOperationLegalOrCustomOrPromote(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::ISD::LOAD, llvm::SelectionDAG::makeEquivalentMemoryOrdering(), narrowExtractedVectorBinOp(), llvm::SDNode::ops(), llvm::peekThroughBitcasts(), llvm::TargetLoweringBase::shouldReduceLoadWidth(), and llvm::ISD::TRUNCATE.

narrowInsertExtractVectorBinOp()

static SDValue narrowInsertExtractVectorBinOp ( SDNode *  Extract, SelectionDAG &  DAG  )

static

Definition at line 17862 of file DAGCombiner.cpp.

References llvm::SDNode::getFlags(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDNode::getNumValues(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), getSubVectorSrc(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::TargetLoweringBase::isBinOp(), and llvm::TargetLoweringBase::isOperationLegalOrCustom().

Referenced by narrowExtractedVectorBinOp().

numVectorEltsOrZero()

static int numVectorEltsOrZero ( EVT  T )

inlinestatic

Definition at line 13765 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::AMDGPU::HSAMD::Kernel::Arg::Key::Align, llvm::ISD::AND, llvm::ISD::ANY_EXTEND, assert(), llvm::ISD::BITCAST, llvm::dbgs(), llvm::SDNode::dump(), llvm::dyn_cast(), llvm::BaseIndexOffset::equalBaseIndex(), llvm::ISD::EXTLOAD, llvm::ISD::FTRUNC, llvm::MemSDNode::getAAInfo(), llvm::DataLayout::getABITypeAlignment(), llvm::LSBaseSDNode::getAddressingMode(), getAlignment(), llvm::MemSDNode::getAlignment(), llvm::LoadSDNode::getBasePtr(), llvm::SelectionDAG::getBitcast(), llvm::MemSDNode::getChain(), llvm::TargetRegisterInfo::getCommonSubClass(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::LoadSDNode::getExtensionType(), llvm::SelectionDAG::getExtLoad(), llvm::MachineMemOperand::getFlags(), llvm::EVT::getIntegerVT(), llvm::SelectionDAG::getLoad(), llvm::APInt::getLowBitsSet(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::LoadSDNode::getOffset(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDNode::getOperand(), llvm::MemSDNode::getPointerInfo(), llvm::TargetLoweringBase::getRegClassFor(), llvm::TargetSubtargetInfo::getRegisterInfo(), llvm::EVT::getSimpleVT(), llvm::EVT::getSizeInBits(), llvm::MemSDNode::getSrcValueOffset(), llvm::EVT::getStoreSizeInBits(), llvm::SelectionDAG::getSubtarget(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::EVT::getTypeForEVT(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValue(), llvm::StoreSDNode::getValue(), llvm::SDNode::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::MachinePointerInfo::getWithOffset(), llvm::SDNode::hasAnyUseOfValue(), llvm::SDNode::hasOneUse(), llvm::SelectionDAG::InferPtrAlignment(), llvm::DataLayout::isBigEndian(), llvm::SDNode::isDivergent(), llvm::EVT::isExtended(), llvm::EVT::isFloatingPoint(), llvm::LSBaseSDNode::isIndexed(), llvm::EVT::isInteger(), llvm::TargetLoweringBase::isLegalAddImmediate(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isTruncateFree(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::LSBaseSDNode::isUnindexed(), llvm::EVT::isVector(), llvm::MemSDNode::isVolatile(), llvm::ARM_MB::LD, LLVM_DEBUG, llvm::ISD::LOAD, llvm::AArch64CC::LS, llvm::BitmaskEnumDetail::Mask(), llvm::BaseIndexOffset::match(), MaySplitLoadIndex, llvm::MinAlign(), N, llvm::ISD::NON_EXTLOAD, llvm::CodeGenOpt::None, llvm::operator!=(), llvm::operator+=(), llvm::operator<(), llvm::operator<=(), llvm::operator==(), llvm::operator>(), llvm::operator>=(), llvm::MVT::Other, llvm::ISD::POST_DEC, llvm::ISD::PRE_DEC, llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::APInt::setAllBits(), llvm::ISD::SEXTLOAD, llvm::ISD::SIGN_EXTEND, llvm::ARM_MB::ST, llvm::ISD::SUB, llvm::ISD::TargetConstant, llvm::ISD::TokenFactor, TRI, llvm::ISD::TRUNCATE, llvm::RegState::Undef, llvm::MVT::Untyped, llvm::SDNode::use_begin(), llvm::SDNode::use_empty(), llvm::ISD::ZERO_EXTEND, and llvm::ISD::ZEXTLOAD.

partitionShuffleOfConcats()

static SDValue partitionShuffleOfConcats ( SDNode *  N, SelectionDAG &  DAG  )

static

Definition at line 18237 of file DAGCombiner.cpp.

References llvm::all_of(), assert(), llvm::ISD::CONCAT_VECTORS, llvm::ShuffleVectorSDNode::getMask(), llvm::SelectionDAG::getNode(), llvm::SDValue::getNumOperands(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), I, llvm::SDValue::isUndef(), N, llvm::SmallVectorTemplateBase< T >::push_back(), and llvm::ArrayRef< T >::slice().

Referenced by simplifyShuffleOfShuffle().

reduceBuildVecToShuffleWithZero()

static SDValue reduceBuildVecToShuffleWithZero ( SDNode *  BV, SelectionDAG &  DAG  )

static

Definition at line 17114 of file DAGCombiner.cpp.

References llvm::ISD::allOperandsUndef(), llvm::ISD::ANY_EXTEND, assert(), llvm::SmallVectorTemplateCommon< T >::back(), llvm::SmallVectorTemplateCommon< T >::begin(), llvm::ISD::BUILD_VECTOR, C, Concat, llvm::ISD::CONCAT_VECTORS, llvm::SmallVectorTemplateCommon< T >::end(), llvm::ISD::EXTRACT_SUBVECTOR, llvm::ISD::EXTRACT_VECTOR_ELT, llvm::find(), llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getConstantFP(), llvm::SDValue::getConstantOperandAPInt(), llvm::SDValue::getConstantOperandVal(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::SelectionDAG::getNode(), llvm::SDNode::getNumOperands(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::EVT::getSizeInBits(), llvm::getSplatValue(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::TargetLoweringBase::getVectorIdxTy(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::EVT::getVectorVT(), llvm::SDValue::hasOneUse(), llvm::tgtok::In, llvm::EVT::isInteger(), llvm::isNullConstant(), llvm::isNullFPConstant(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isShuffleMaskLegal(), llvm::EVT::isSimple(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::Left, llvm::BitmaskEnumDetail::Mask(), llvm::max(), llvm::peekThroughBitcasts(), llvm::SmallVectorTemplateBase< T >::pop_back(), llvm::PowerOf2Ceil(), llvm::SmallVectorTemplateBase< T >::push_back(), llvm::Right, llvm::SmallVectorBase::size(), llvm::APInt::uge(), llvm::ISD::VECTOR_SHUFFLE, and llvm::ISD::ZERO_EXTEND.

replaceShuffleOfInsert()

static SDValue replaceShuffleOfInsert ( ShuffleVectorSDNode *  Shuf, SelectionDAG &  DAG  )

static

If a shuffle inserts exactly one element from a source vector operand into another vector operand and we can access the specified element as a scalar, then we can eliminate the shuffle.

Definition at line 18593 of file DAGCombiner.cpp.

References assert(), llvm::ArrayRef< T >::begin(), llvm::ShuffleVectorSDNode::commuteMask(), llvm::dyn_cast(), llvm::ArrayRef< T >::end(), llvm::SelectionDAG::getConstant(), llvm::ShuffleVectorSDNode::getMask(), llvm::SelectionDAG::getNode(), llvm::SDNode::getOperand(), getShuffleMaskIndexOfOneElementFromOp0IntoOp1(), llvm::ISD::INSERT_VECTOR_ELT, llvm::ArrayRef< T >::size(), and std::swap().

Referenced by simplifyShuffleOfShuffle().

scalarizeBinOpOfSplats()

static SDValue scalarizeBinOpOfSplats ( SDNode *  N, SelectionDAG &  DAG  )

static

If a vector binop is performed on splat values, it may be profitable to extract, scalarize, and insert/splat.

Definition at line 19370 of file DAGCombiner.cpp.

References llvm::ISD::AND, assert(), llvm::EVT::bitsGE(), llvm::EVT::bitsGT(), llvm::ISD::BUILD_VECTOR, llvm::ISD::ConstantFP, llvm::count_if(), llvm::dyn_cast(), llvm::ISD::EXTLOAD, llvm::ISD::EXTRACT_VECTOR_ELT, llvm::SelectionDAG::FoldConstantVectorArithmetic(), llvm::ISD::FSQRT, llvm::ArrayType::get(), llvm::ConstantArray::get(), llvm::MachinePointerInfo::getAddrSpace(), getAlignment(), llvm::MemSDNode::getAlignment(), llvm::LoadSDNode::getBasePtr(), llvm::SelectionDAG::getBuildVector(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getConstantPool(), llvm::SelectionDAG::getDataLayout(), llvm::LoadSDNode::getExtensionType(), llvm::SelectionDAG::getExtLoad(), llvm::MachineMemOperand::getFlags(), llvm::SDNode::getFlags(), llvm::SelectionDAG::getIntPtrConstant(), llvm::SelectionDAG::getLoad(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SelectionDAG::getNOT(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::TargetLoweringBase::getOperationAction(), llvm::MemSDNode::getPointerInfo(), llvm::TargetLoweringBase::getPointerTy(), llvm::DataLayout::getPrefTypeAlignment(), llvm::SelectionDAG::getSelect(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getSplatSourceVector(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::Value::getType(), llvm::DataLayout::getTypeAllocSize(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValue(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::TargetLoweringBase::getVectorIdxTy(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::TargetLoweringBase::hasAndNot(), llvm::SDNode::hasAnyUseOfValue(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasPredecessorHelper(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::ISD::INSERT_SUBVECTOR, llvm::isAllOnesConstant(), llvm::isConstOrConstSplatFP(), llvm::TargetLoweringBase::isExtractVecEltCheap(), llvm::EVT::isFloatingPoint(), llvm::TargetLoweringBase::isFPImmLegal(), llvm::LSBaseSDNode::isIndexed(), llvm::isNullConstant(), llvm::isOneConstant(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::TargetLoweringBase::isOperationLegalOrCustomOrPromote(), llvm::SDNode::isPredecessorOf(), llvm::TargetLoweringBase::isTypeLegal(), llvm::EVT::isVector(), llvm::MemSDNode::isVolatile(), llvm::ConstantFPSDNode::isZero(), llvm::TargetLoweringBase::Legal, llvm::SPII::Load, llvm::ISD::LOAD, llvm::MachineMemOperand::MODereferenceable, llvm::MachineMemOperand::MOInvariant, llvm::ISD::NON_EXTLOAD, llvm::SDNode::ops(), llvm::SmallVectorTemplateBase< T >::push_back(), llvm::TargetLoweringBase::reduceSelectOfFPConstantLoads(), llvm::ISD::SDIV, llvm::ISD::SDIVREM, llvm::ISD::SELECT, llvm::ISD::SELECT_CC, llvm::ISD::SETCC, llvm::SDNode::setFlags(), llvm::ISD::SETGT, llvm::ISD::SETLT, llvm::ISD::SETOLT, llvm::ISD::SETULT, llvm::ISD::SRA, llvm::ISD::SREM, llvm::ISD::SRL, llvm::ISD::TargetFrameIndex, llvm::ISD::TRUNCATE, llvm::ISD::UDIV, llvm::ISD::UDIVREM, llvm::ISD::UREM, X, Y, and llvm::Z.

scalarizeExtractedBinop()

static SDValue scalarizeExtractedBinop ( SDNode *  ExtElt, SelectionDAG &  DAG, bool  LegalOperations  )

static

Transform a vector binary operation into a scalar binary operation by moving the math/logic after an extract element of a vector.

Definition at line 16593 of file DAGCombiner.cpp.

References llvm::AfterLegalizeTypes, llvm::AfterLegalizeVectorOps, llvm::TargetLoweringBase::aggressivelyPreferBuildVectorSources(), llvm::all_of(), llvm::ISD::ANY_EXTEND, assert(), llvm::ISD::BITCAST, llvm::EVT::bitsGT(), llvm::EVT::bitsLT(), llvm::ISD::BUILD_VECTOR, llvm::ISD::CONCAT_VECTORS, llvm::ISD::DELETED_NODE, llvm::dyn_cast(), llvm::ISD::EXTRACT_SUBVECTOR, llvm::ISD::EXTRACT_VECTOR_ELT, llvm::SelectionDAG::getAnyExtOrTrunc(), llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getBuildVector(), llvm::SelectionDAG::getConstant(), llvm::SDValue::getConstantOperandVal(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::APInt::getNullValue(), llvm::SDNode::getNumOperands(), llvm::SDNode::getNumValues(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::SelectionDAG::getSExtOrTrunc(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::TargetLoweringBase::getVectorIdxTy(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::EVT::getVectorVT(), llvm::SDNode::hasNUsesOfValue(), llvm::SDValue::hasOneUse(), llvm::tgtok::In, llvm::ISD::INSERT_SUBVECTOR, llvm::ISD::INSERT_VECTOR_ELT, isAnyConstantBuildVector(), llvm::TargetLoweringBase::isBinOp(), llvm::TargetLoweringBase::isExtractSubvectorCheap(), llvm::EVT::isInteger(), llvm::DataLayout::isLittleEndian(), llvm::ISD::isNormalLoad(), llvm::TargetLoweringBase::isOperationExpand(), llvm::TargetLoweringBase::isOperationLegal(), llvm::isPowerOf2_32(), llvm::EVT::isScalarInteger(), llvm::TargetLoweringBase::isTruncateFree(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::MemSDNode::isVolatile(), llvm::BitmaskEnumDetail::Mask(), llvm::MVT::Other, llvm::ISD::SCALAR_TO_VECTOR, llvm::APInt::setBit(), llvm::TargetLoweringBase::shouldScalarizeBinop(), llvm::SmallVectorBase::size(), llvm::ISD::TRUNCATE, llvm::SDNode::uses(), llvm::NVPTX::VecLoad, llvm::ISD::VECTOR_SHUFFLE, X, and llvm::ISD::ZERO_EXTEND.

ShrinkLoadReplaceStoreWithStore()

static SDValue ShrinkLoadReplaceStoreWithStore ( const std::pair< unsigned, unsigned > &  MaskInfo, SDValue  IVal, StoreSDNode *  St, DAGCombiner *  DC  )

static

Check to see if IVal is something that provides a value as specified by MaskInfo.

If so, replace the specified store with a narrower store of truncated IVal.

Definition at line 14660 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::AMDGPU::HSAMD::Kernel::Arg::Key::Align, llvm::TargetLoweringBase::allowsMemoryAccess(), llvm::ISD::AND, llvm::SmallVectorImpl< T >::append(), assert(), llvm::SmallVectorTemplateCommon< T >::begin(), llvm::ISD::BITCAST, llvm::APFloat::bitcastToAPInt(), llvm::EVT::bitsEq(), llvm::ISD::BUILD_VECTOR, C, llvm::TargetLoweringBase::canMergeStoresTo(), CheckForMaskedLoad(), llvm::ISD::CONCAT_VECTORS, llvm::ISD::Constant, llvm::BaseIndexOffset::contains(), Context, llvm::APInt::countLeadingZeros(), llvm::APInt::countTrailingZeros(), llvm::dbgs(), llvm::ISD::DELETED_NODE, llvm::BaseIndexOffset::dump(), llvm::dyn_cast(), E, llvm::SmallVectorBase::empty(), EnableStoreMerging, llvm::DenseMapBase< DenseMap< KeyT, ValueT, KeyInfoT, BucketT >, KeyT, ValueT, KeyInfoT, BucketT >::end(), llvm::BaseIndexOffset::equalBaseIndex(), llvm::SmallVectorImpl< T >::erase(), llvm::ISD::EXTLOAD, llvm::ISD::EXTRACT_SUBVECTOR, llvm::ISD::EXTRACT_VECTOR_ELT, llvm::MVT::f128, llvm::MVT::f16, llvm::MVT::f32, llvm::MVT::f64, llvm::MVT::f80, llvm::DenseMapBase< DenseMap< KeyT, ValueT, KeyInfoT, BucketT >, KeyT, ValueT, KeyInfoT, BucketT >::find(), llvm::ISD::FP_ROUND, From, llvm::MemSDNode::getAAInfo(), llvm::DataLayout::getABITypeAlignment(), llvm::MemSDNode::getAddressSpace(), llvm::MachinePointerInfo::getAddrSpace(), llvm::MemSDNode::getAlignment(), llvm::APInt::getAllOnesValue(), llvm::SelectionDAG::getAnyExtOrTrunc(), llvm::ConstantSDNode::getAPIntValue(), llvm::BaseIndexOffset::getBase(), llvm::MemSDNode::getBasePtr(), llvm::LoadSDNode::getBasePtr(), llvm::StoreSDNode::getBasePtr(), llvm::SelectionDAG::getBitcast(), llvm::APInt::getBitsSet(), llvm::SelectionDAG::getBuildVector(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::SelectionDAG::GetDemandedBits(), llvm::SelectionDAG::getExtLoad(), llvm::MachineMemOperand::getFlags(), llvm::MachineFunction::getFunction(), llvm::EVT::getIntegerVT(), llvm::MVT::getIntegerVT(), llvm::SelectionDAG::getLoad(), llvm::APInt::getLowBitsSet(), llvm::SelectionDAG::getMachineFunction(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getNumOperands(), llvm::SDNode::getNumOperands(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::MemSDNode::getPointerInfo(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SDNode::getSimpleValueType(), llvm::EVT::getSizeInBits(), llvm::MemSDNode::getSrcValueOffset(), llvm::SelectionDAG::getStore(), llvm::EVT::getStoreSize(), llvm::EVT::getStoreSizeInBits(), llvm::SelectionDAG::getTokenFactor(), llvm::SelectionDAG::getTruncStore(), llvm::TargetLoweringBase::getTypeAction(), llvm::EVT::getTypeForEVT(), llvm::TargetLoweringBase::getTypeToTransformTo(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValue(), llvm::StoreSDNode::getValue(), llvm::ConstantFPSDNode::getValueAPF(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::EVT::getVectorVT(), llvm::MachinePointerInfo::getWithOffset(), llvm::SelectionDAG::getZExtOrTrunc(), llvm::APInt::getZExtValue(), llvm::Function::hasFnAttribute(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::TargetLoweringBase::hasPairedLoad(), llvm::SDNode::hasPredecessorHelper(), llvm::MipsISD::Hi, I, llvm::MVT::i32, llvm::MVT::i64, llvm::SelectionDAG::InferPtrAlignment(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::ISD::INSERT_VECTOR_ELT, llvm::APInt::insertBits(), llvm::APInt::isAllOnesValue(), llvm::DataLayout::isBigEndian(), llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), llvm::TargetLowering::isDesirableToTransformToIntegerOp(), llvm::LSBaseSDNode::isIndexed(), llvm::EVT::isInteger(), llvm::DataLayout::isLittleEndian(), llvm::TargetLoweringBase::isLoadExtLegal(), llvm::TargetLoweringBase::isMultiStoresCheaperThanBitsMerge(), llvm::TargetLoweringBase::isNarrowingProfitable(), llvm::MemSDNode::isNonTemporal(), llvm::ISD::isNormalLoad(), llvm::ISD::isNormalStore(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::EVT::isScalarInteger(), llvm::TargetLoweringBase::isShuffleMaskLegal(), llvm::EVT::isSimple(), llvm::TargetLoweringBase::isStoreBitCastBeneficial(), llvm::StoreSDNode::isTruncatingStore(), llvm::TargetLoweringBase::isTruncStoreLegal(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::LSBaseSDNode::isUnindexed(), llvm::EVT::isVector(), llvm::MemSDNode::isVolatile(), llvm::ISD::LIFETIME_END, llvm::ISD::LIFETIME_START, LLVM_DEBUG, llvm_unreachable, llvm::MipsISD::Lo, llvm::SPII::Load, llvm::ISD::LOAD, llvm::BitmaskEnumDetail::Mask(), llvm::SelectionDAG::MaskedValueIsZero(), llvm::BaseIndexOffset::match(), llvm::max(), llvm::TargetLoweringBase::mergeStoresAfterLegalization(), llvm::MinAlign(), llvm::MachineMemOperand::MODereferenceable, llvm::MachineMemOperand::MONone, llvm::MachineMemOperand::MONonTemporal, llvm::ISD::MUL, N, llvm::NextPowerOf2(), llvm::ISD::NON_EXTLOAD, llvm::CodeGenOpt::None, llvm::SDNode::ops(), llvm::ISD::OR, llvm::MVT::Other, Other, llvm::peekThroughBitcasts(), llvm::SmallVectorImpl< T >::pop_back_val(), llvm::MVT::ppcf128, llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SelectionDAG::ReplaceAllUsesOfValuesWith(), llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), second, llvm::ISD::SEXTLOAD, llvm::ISD::SHL, llvm::TargetLoweringBase::shouldReduceLoadWidth(), llvm::TargetLoweringBase::shouldSplatInsEltVarIndex(), llvm::MVT::SimpleTy, llvm::SmallVectorBase::size(), llvm::SmallPtrSetImplBase::size(), llvm::sort(), splitMergedValStore(), llvm::ISD::SRL, llvm::ARM_MB::ST, llvm::SPII::Store, llvm::ISD::STORE, StoreMergeDependenceLimit, llvm::TargetLoweringBase::storeOfVectorConstantIsCheap(), std::swap(), llvm::ISD::TargetConstantFP, llvm::ISD::TokenFactor, llvm::APInt::trunc(), llvm::ISD::TRUNCATE, llvm::TargetLoweringBase::TypePromoteInteger, llvm::SelectionDAG::UpdateNodeOperands(), llvm::SDNode::use_begin(), llvm::SDNode::use_empty(), llvm::SDNode::use_end(), llvm::SDNode::uses(), llvm::ISD::XOR, llvm::ISD::ZERO_EXTEND, llvm::ISD::ZEXTLOAD, and llvm::APInt::zextOrTrunc().

simplifyDivRem()

static SDValue simplifyDivRem ( SDNode *  N, SelectionDAG &  DAG  )

static

Definition at line 3753 of file DAGCombiner.cpp.

References llvm::MCID::Add, llvm::ISD::ADD, llvm::ISD::ADDC, llvm::AfterLegalizeDAG, llvm::AfterLegalizeTypes, llvm::TargetLoweringBase::allowsMemoryAccess(), llvm::ISD::AND, llvm::ISD::ANY_EXTEND, assert(), llvm::ISD::AssertZext, B, llvm::ISD::BITCAST, llvm::tgtok::Bits, llvm::EVT::bitsGE(), llvm::ISD::BSWAP, C, llvm::TargetLoweringBase::convertSetCCLogicToBitwiseLogic(), llvm::APInt::countTrailingOnes(), llvm::ISD::CTTZ, llvm::dbgs(), llvm::MipsISD::DivRem, llvm::SDNode::dump(), llvm::dyn_cast(), llvm::ISD::EXTLOAD, llvm::ISD::EXTRACT_VECTOR_ELT, llvm::APInt::extractBits(), llvm::SelectionDAG::FoldConstantArithmetic(), llvm::LSBaseSDNode::getAddressingMode(), llvm::MemSDNode::getAddressSpace(), llvm::SelectionDAG::getAllOnesConstant(), llvm::APInt::getAllOnesValue(), llvm::ConstantSDNode::getAPIntValue(), getAsNonOpaqueConstant(), llvm::Function::getAttributes(), llvm::MemSDNode::getBasePtr(), llvm::LoadSDNode::getBasePtr(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::LoadSDNode::getExtensionType(), llvm::SelectionDAG::getExtLoad(), llvm::MachineMemOperand::getFlags(), llvm::SDNode::getFlags(), llvm::MachineFunction::getFunction(), llvm::APInt::getHighBitsSet(), llvm::EVT::getIntegerVT(), llvm::SelectionDAG::getLoad(), llvm::SelectionDAG::getMachineFunction(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::APInt::getMinSignedBits(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SelectionDAG::getNodeIfExists(), llvm::APInt::getNullValue(), llvm::SDValue::getNumOperands(), llvm::SDNode::getNumValues(), llvm::LoadSDNode::getOffset(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SDValue::getResNo(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SelectionDAG::getSelect(), llvm::SelectionDAG::getSetCC(), llvm::ISD::getSetCCAndOperation(), llvm::ISD::getSetCCOrOperation(), llvm::ISD::getSetCCSwappedOperands(), llvm::APInt::getSExtValue(), llvm::TargetLoweringBase::getShiftAmountTy(), llvm::SDValue::getSimpleValueType(), llvm::EVT::getSimpleVT(), llvm::EVT::getSizeInBits(), llvm::MVT::getSizeInBits(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValue(), llvm::StoreSDNode::getValue(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::SelectionDAG::getVectorShuffle(), llvm::SDNode::getVTList(), llvm::SelectionDAG::getZExtOrTrunc(), llvm::APInt::getZExtValue(), llvm::ConstantSDNode::getZExtValue(), llvm::MVT::Glue, llvm::SDNode::hasAnyUseOfValue(), llvm::SDNodeFlags::hasExact(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::HasValue(), llvm::MipsISD::Hi, llvm::MVT::i1, llvm::MVT::i16, llvm::MVT::i32, llvm::MVT::i64, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isAllOnesConstant(), llvm::isAllOnesOrAllOnesSplat(), llvm::APInt::isAllOnesValue(), llvm::ConstantSDNode::isAllOnesValue(), llvm::ISD::isBuildVectorAllOnes(), llvm::ISD::isBuildVectorAllZeros(), llvm::TargetLoweringBase::isCondCodeLegal(), llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), isConstantOrConstantVector(), llvm::isConstOrConstSplat(), llvm::EVT::isExtended(), llvm::ISD::isEXTLoad(), llvm::TargetLoweringBase::isIntDivCheap(), llvm::EVT::isInteger(), llvm::SelectionDAG::isKnownNeverZero(), llvm::SelectionDAG::isKnownToBeAPowerOfTwo(), llvm::TargetLoweringBase::isLegalAddImmediate(), llvm::TargetLoweringBase::isLoadExtLegal(), llvm::APInt::isMask(), llvm::APInt::isMinSignedValue(), llvm::TargetLoweringBase::isNarrowingProfitable(), llvm::isNullConstant(), llvm::isNullOrNullSplat(), llvm::ConstantSDNode::isNullValue(), llvm::ConstantSDNode::isOne(), llvm::isOneConstant(), llvm::ConstantSDNode::isOpaque(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::EVT::isRound(), llvm::ISD::isSEXTLoad(), llvm::EVT::isSimple(), llvm::TargetLoweringBase::isTruncateFree(), llvm::TargetLoweringBase::isTruncStoreLegal(), llvm::TargetLowering::isTypeDesirableForOp(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::SelectionDAG::isUndef(), llvm::ISD::isUNINDEXEDLoad(), llvm::EVT::isVector(), llvm::MemSDNode::isVolatile(), llvm::TargetLoweringBase::isZExtFree(), LLVM_DEBUG, llvm_unreachable, llvm::MipsISD::Lo, llvm::SPII::Load, llvm::ISD::LOAD, llvm::BitmaskEnumDetail::Mask(), llvm::SelectionDAG::MaskedValueIsZero(), llvm::ISD::matchBinaryPredicate(), llvm::ISD::matchUnaryPredicate(), llvm::ISD::MUL, llvm::ISD::MULHS, llvm::ISD::MULHU, llvm::ISD::NON_EXTLOAD, llvm::SDNode::op_values(), llvm::SDNode::ops(), llvm::ISD::OR, llvm::MVT::Other, llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::SelectionDAG::ReplaceAllUsesWith(), llvm::ISD::SADDO, llvm::ISD::SCALAR_TO_VECTOR, llvm::ISD::SDIV, llvm::ISD::SETCC, llvm::ISD::SETCC_INVALID, llvm::ISD::SETEQ, llvm::ISD::SETGT, llvm::ISD::SETLT, llvm::ISD::SETNE, llvm::ISD::SETUGE, llvm::ISD::SHL, llvm::APInt::shl(), llvm::TargetLoweringBase::shouldFoldMaskToVariableShiftPair(), llvm::TargetLoweringBase::shouldReduceLoadWidth(), llvm::ISD::SIGN_EXTEND, llvm::SelectionDAG::SignBitIsZero(), Size, llvm::SmallVectorBase::size(), llvm::ISD::SMAX, llvm::ISD::SMIN, llvm::ISD::SMULO, llvm::ISD::SRA, llvm::ISD::SREM, llvm::ISD::SRL, llvm::SPII::Store, llvm::ISD::SUB, std::swap(), T1, llvm::APInt::trunc(), llvm::ISD::TRUNCATE, tryFoldToZero(), llvm::ISD::UADDO, llvm::ISD::UDIV, llvm::APInt::ugt(), llvm::APInt::ult(), llvm::ISD::UMAX, llvm::ISD::UMIN, llvm::MVT::Untyped, llvm::SelectionDAG::UpdateNodeOperands(), llvm::ISD::UREM, llvm::ISD::VECTOR_SHUFFLE, X, llvm::ISD::XOR, Y, llvm::ISD::ZERO_EXTEND, llvm::ISD::ZEXTLOAD, and llvm::APInt::zextOrTrunc().

simplifyShuffleOfShuffle()

static SDValue simplifyShuffleOfShuffle ( ShuffleVectorSDNode *  Shuf )

static

If we have a unary shuffle of a shuffle, see if it can be folded away completely.

This has the potential to lose undef knowledge because the first shuffle may not have an undef mask element where the second one does. So only call this after doing simplifications based on demanded elements.

Definition at line 18647 of file DAGCombiner.cpp.

References llvm::AfterLegalizeDAG, llvm::AfterLegalizeVectorOps, llvm::ISD::AND, llvm::ISD::ANY_EXTEND, assert(), llvm::ArrayRef< T >::begin(), llvm::ISD::BITCAST, llvm::tgtok::Bits, llvm::EVT::bitsLT(), llvm::ISD::BUILD_VECTOR, combineShuffleOfScalars(), combineShuffleOfSplatVal(), combineShuffleToVectorExtend(), combineTruncationShuffle(), llvm::ShuffleVectorSDNode::commuteMask(), llvm::SelectionDAG::ComputeNumSignBits(), llvm::ISD::CONCAT_VECTORS, llvm::dyn_cast(), llvm::ArrayRef< T >::end(), llvm::ISD::EXTRACT_SUBVECTOR, llvm::ISD::EXTRACT_VECTOR_ELT, foldShuffleOfConcatUndefs(), llvm::ISD::FP16_TO_FP, llvm::ConstantSDNode::getAPIntValue(), getAsNonOpaqueConstant(), llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getBuildVector(), llvm::SelectionDAG::getCommutedVectorShuffle(), llvm::SelectionDAG::getConstant(), llvm::SDValue::getConstantOperandVal(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::SDNode::getFlags(), llvm::EVT::getIntegerVT(), llvm::SelectionDAG::getIntPtrConstant(), llvm::ShuffleVectorSDNode::getMask(), llvm::ShuffleVectorSDNode::getMaskElt(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getNumOperands(), llvm::SDNode::getNumOperands(), llvm::SDNode::getNumValues(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::EVT::getSizeInBits(), llvm::ShuffleVectorSDNode::getSplatIndex(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorElementType(), llvm::TargetLoweringBase::getVectorIdxTy(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::EVT::getVectorVT(), llvm::SDValue::hasOneUse(), llvm::ISD::INSERT_SUBVECTOR, llvm::APInt::isAllOnesValue(), llvm::DataLayout::isBigEndian(), llvm::TargetLoweringBase::isBinOp(), llvm::TargetLoweringBase::isExtractVecEltCheap(), llvm::isNullConstant(), llvm::SDNode::isOnlyUserOf(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::EVT::isScalarInteger(), llvm::TargetLoweringBase::isShuffleMaskLegal(), llvm::ShuffleVectorSDNode::isSplat(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::TargetLoweringBase::isVectorClearMaskLegal(), llvm::APInt::lshrInPlace(), llvm::BitmaskEnumDetail::Mask(), N, llvm::SDNode::op_begin(), llvm::SDNode::op_end(), partitionShuffleOfConcats(), llvm::peekThroughBitcasts(), llvm::peekThroughOneUseBitcasts(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorTemplateBase< T >::push_back(), replaceShuffleOfInsert(), llvm::ISD::SCALAR_TO_VECTOR, llvm::ArrayRef< T >::size(), std::swap(), llvm::APInt::trunc(), llvm::ISD::TRUNCATE, llvm::ISD::VECREDUCE_AND, llvm::ISD::VECREDUCE_OR, llvm::ISD::VECREDUCE_UMAX, llvm::ISD::VECREDUCE_UMIN, and llvm::ISD::VECTOR_SHUFFLE.

STATISTIC() [1/7]

STATISTIC	(	NodesCombined	,
		"Number of dag nodes combined"
	)

STATISTIC() [2/7]

STATISTIC	(	PreIndexedNodes	,
		"Number of pre-indexed nodes created"
	)

STATISTIC() [3/7]

STATISTIC	(	PostIndexedNodes	,
		"Number of post-indexed nodes created"
	)

STATISTIC() [4/7]

STATISTIC	(	OpsNarrowed	,
		"Number of load/op/store narrowed"
	)

STATISTIC() [5/7]

STATISTIC	(	LdStFP2Int	,
		"Number of fp load/store pairs transformed to int"
	)

STATISTIC() [6/7]

STATISTIC	(	SlicedLoads	,
		"Number of load sliced"
	)

STATISTIC() [7/7]

STATISTIC	(	NumFPLogicOpsConv	,
		"Number of logic ops converted to fp ops"
	)

stripConstantMask()

static SDValue stripConstantMask ( SelectionDAG &  DAG, SDValue  Op, SDValue &  Mask  )

static

Definition at line 5938 of file DAGCombiner.cpp.

References llvm::ISD::AND, llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), and llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt().

Referenced by extractShiftForRotate(), and matchRotateHalf().

stripTruncAndExt()

static SDValue stripTruncAndExt ( SDValue  Value )

static

Definition at line 6518 of file DAGCombiner.cpp.

References llvm::ISD::ABS, llvm::MCID::Add, llvm::ISD::ADD, llvm::ARMBuildAttrs::Allowed, llvm::TargetLoweringBase::allowsMemoryAccess(), llvm::ISD::AND, llvm::ISD::ANY_EXTEND, assert(), BigEndianByteAt(), llvm::ISD::BITREVERSE, llvm::ISD::BRCOND, llvm::ISD::BSWAP, C, calculateByteProvider(), llvm::SelectionDAG::computeKnownBits(), llvm::SelectionDAG::ComputeNumSignBits(), llvm::ISD::CopyFromReg, llvm::APInt::countTrailingZeros(), llvm::ISD::CTLZ, llvm::ISD::CTLZ_ZERO_UNDEF, llvm::ISD::CTPOP, llvm::ISD::CTTZ, llvm::ISD::CTTZ_ZERO_UNDEF, llvm::dyn_cast(), llvm::SmallPtrSetImplBase::empty(), llvm::BaseIndexOffset::equalBaseIndex(), llvm::MipsISD::Ext, llvm::CallingConv::Fast, llvm::SelectionDAG::FoldConstantArithmetic(), llvm::ISD::FSHL, llvm::MemSDNode::getAlignment(), llvm::SelectionDAG::getAllOnesConstant(), llvm::APInt::getAllOnesValue(), llvm::ConstantSDNode::getAPIntValue(), getAsNonOpaqueConstant(), llvm::LoadSDNode::getBasePtr(), llvm::StoreSDNode::getBasePtr(), llvm::TargetLoweringBase::getBooleanContents(), llvm::APInt::getBoolValue(), llvm::SelectionDAG::getBuildVector(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), llvm::SelectionDAG::getDataLayout(), llvm::SDNode::getFlags(), llvm::APInt::getHighBitsSet(), llvm::EVT::getIntegerVT(), llvm::ConstantSDNode::getLimitedValue(), llvm::SelectionDAG::getLoad(), llvm::APInt::getLowBitsSet(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SelectionDAG::getNOT(), llvm::LoadSDNode::getOffset(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::MemSDNode::getPointerInfo(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SelectionDAG::getSelectCC(), llvm::SelectionDAG::getSetCC(), llvm::ISD::getSetCCInverse(), llvm::SelectionDAG::getSExtOrTrunc(), llvm::ConstantSDNode::getSExtValue(), llvm::SDValue::getSimpleValueType(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getStore(), llvm::SelectionDAG::getTargetLoweringInfo(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueSizeInBits(), llvm::SDValue::getValueType(), llvm::SelectionDAG::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::EVT::getVectorVT(), llvm::SelectionDAG::getZExtOrTrunc(), llvm::APInt::getZExtValue(), llvm::ConstantSDNode::getZExtValue(), llvm::TargetLoweringBase::hasAndNot(), llvm::SDNodeFlags::hasExact(), llvm::SDNode::hasNUsesOfValue(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::Optional< T >::hasValue(), llvm::MVT::i1, llvm::MVT::i16, llvm::MVT::i32, llvm::MVT::i64, llvm::MVT::i8, llvm::SmallPtrSetImpl< PtrType >::insert(), INT64_MAX, llvm::isAllOnesConstant(), llvm::isAllOnesOrAllOnesSplat(), llvm::DataLayout::isBigEndian(), isBigEndian(), llvm::isBitwiseNot(), llvm::ISD::isBuildVectorAllZeros(), llvm::TargetLoweringBase::isCondCodeLegal(), llvm::BuildVectorSDNode::isConstant(), llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), isConstantOrConstantVector(), llvm::isConstOrConstSplat(), llvm::TargetLowering::isConstTrueVal(), llvm::TargetLowering::isDesirableToCommuteWithShift(), llvm::LSBaseSDNode::isIndexed(), llvm::EVT::isInteger(), llvm::SelectionDAG::isKnownNeverZero(), llvm::isNullConstant(), llvm::isNullOrNullSplat(), llvm::isOneConstant(), llvm::ConstantSDNode::isOpaque(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::APInt::isPowerOf2(), llvm::isPowerOf2_32(), llvm::EVT::isSimple(), llvm::TargetLoweringBase::isTruncateFree(), llvm::TargetLowering::isTypeDesirableForOp(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::MemSDNode::isVolatile(), LittleEndianByteAt(), llvm_unreachable, llvm::ISD::LOAD, llvm::Log2_32(), llvm::APInt::lshr(), llvm::APInt::lshrInPlace(), llvm::BitmaskEnumDetail::Mask(), llvm::SelectionDAG::MaskedValueIsZero(), llvm::BaseIndexOffset::match(), llvm::ISD::matchBinaryPredicate(), llvm::ISD::MUL, llvm::KnownBits::One, llvm::ISD::OR, Other, P, llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::SelectionDAG::ReplaceAllUsesWith(), llvm::ISD::ROTL, llvm::ISD::ROTR, llvm::ISD::SELECT, llvm::ISD::SELECT_CC, llvm::ISD::SETCC, llvm::ISD::SHL, llvm::APInt::shl(), llvm::TargetLoweringBase::shouldFoldConstantShiftPairToMask(), llvm::ISD::SIGN_EXTEND, llvm::ISD::SIGN_EXTEND_INREG, llvm::SelectionDAG::SignBitIsZero(), llvm::SelectionDAG::simplifyShift(), llvm::SmallVectorBase::size(), llvm::ISD::SRA, llvm::ISD::SREM, llvm::ISD::SRL, llvm::SPII::Store, llvm::ISD::STORE, llvm::ISD::SUB, std::swap(), llvm::ISD::TRUNCATE, tryFoldToZero(), llvm::APInt::uge(), llvm::APInt::ult(), llvm::SDNode::use_begin(), X, llvm::ISD::XOR, Y, llvm::KnownBits::Zero, llvm::ISD::ZERO_EXTEND, zeroExtendToMatch(), and llvm::TargetLoweringBase::ZeroOrNegativeOneBooleanContent.

tryFoldToZero()

static SDValue tryFoldToZero ( const SDLoc &  DL, const TargetLowering &  TLI, EVT  VT, SelectionDAG &  DAG, bool  LegalOperations  )

static

Definition at line 3033 of file DAGCombiner.cpp.

References llvm::ISD::ABS, llvm::APInt::abs(), llvm::MCID::Add, llvm::ISD::ADD, llvm::AfterLegalizeVectorOps, llvm::ISD::AND, assert(), llvm::ISD::BUILD_VECTOR, C, llvm::ISD::CARRY_FALSE, llvm::TargetLoweringBase::decomposeMulByConstant(), llvm::ISD::DELETED_NODE, foldAddSubBoolOfMaskedVal(), foldAddSubMasked1(), foldAddSubOfSignBit(), llvm::SelectionDAG::FoldConstantArithmetic(), llvm::SelectionDAG::getAllOnesConstant(), llvm::ConstantSDNode::getAPIntValue(), getAsNonOpaqueConstant(), llvm::APInt::getBitWidth(), llvm::TargetLoweringBase::getBooleanContents(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getContext(), llvm::SDNode::getFlags(), llvm::SelectionDAG::getGlobalAddress(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDValue::getScalarValueSizeInBits(), llvm::ConstantSDNode::getSExtValue(), llvm::APInt::getSignMask(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::VTSDNode::getVT(), llvm::SDNode::getVTList(), llvm::SelectionDAG::getZExtOrTrunc(), llvm::ISD::GlobalAddress, llvm::MVT::Glue, llvm::SDNode::hasAnyUseOfValue(), llvm::SDNodeFlags::hasNoSignedWrap(), llvm::SDNodeFlags::hasNoUnsignedWrap(), llvm::SDValue::hasOneUse(), llvm::SDNode::hasOneUse(), llvm::MVT::i1, llvm::isAllOnesConstant(), llvm::isAllOnesOrAllOnesSplat(), llvm::APInt::isAllOnesValue(), llvm::isBitwiseNot(), llvm::ISD::isBuildVectorAllZeros(), llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), isConstantOrConstantVector(), llvm::ISD::isConstantSplatVector(), llvm::isConstOrConstSplat(), llvm::SelectionDAG::isKnownToBeAPowerOfTwo(), llvm::APInt::isNegative(), llvm::isNullConstant(), llvm::isNullOrNullSplat(), llvm::APInt::isNullValue(), llvm::TargetLowering::isOffsetFoldingLegal(), llvm::isOneOrOneSplat(), llvm::APInt::isOneValue(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::SelectionDAG::MaskedValueIsZero(), llvm::ISD::MUL, llvm::TargetLoweringBase::preferIncOfAddToSubOfNot(), llvm::ISD::SADDO, llvm::ISD::SHL, llvm::ISD::SIGN_EXTEND, llvm::ISD::SIGN_EXTEND_INREG, llvm::ISD::SRA, llvm::ISD::SRL, llvm::ISD::SSUBO, llvm::ISD::SUB, llvm::ISD::SUBC, llvm::ISD::USUBO, llvm::ISD::XOR, Y, llvm::ISD::ZERO_EXTEND, and llvm::TargetLoweringBase::ZeroOrNegativeOneBooleanContent.

Referenced by simplifyDivRem(), and stripTruncAndExt().

tryToFoldExtendOfConstant()

static SDValue tryToFoldExtendOfConstant ( SDNode *  N, const TargetLowering &  TLI, SelectionDAG &  DAG, bool  LegalTypes  )

static

Try to fold a sext/zext/aext dag node into a ConstantSDNode or a build_vector of constants.

This function is called by the DAGCombiner when visiting sext/zext/aext dag nodes (see for example method DAGCombiner::visitSIGN_EXTEND). Vector extends are not folded if operations are legal; this is to avoid introducing illegal build_vector dag nodes.

Definition at line 8830 of file DAGCombiner.cpp.

References llvm::ISD::ANY_EXTEND, assert(), C, llvm::SelectionDAG::getBuildVector(), llvm::SelectionDAG::getConstant(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getScalarType(), llvm::SelectionDAG::getSelect(), llvm::EVT::getSizeInBits(), llvm::SelectionDAG::getUNDEF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::EVT::getVectorNumElements(), llvm::ISD::isBuildVectorOfConstantSDNodes(), llvm::TargetLoweringBase::isTypeLegal(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), llvm::TargetLoweringBase::isZExtFree(), llvm::SmallVectorTemplateBase< T >::push_back(), llvm::ISD::SELECT, llvm::APInt::sext(), llvm::ISD::SIGN_EXTEND, llvm::ISD::SIGN_EXTEND_VECTOR_INREG, llvm::ISD::ZERO_EXTEND, llvm::ISD::ZERO_EXTEND_VECTOR_INREG, and llvm::APInt::zext().

Referenced by foldExtendedSignBitTest(), and isTruncateOf().

tryToFoldExtOfExtload()

static SDValue tryToFoldExtOfExtload ( SelectionDAG &  DAG, DAGCombiner &  Combiner, const TargetLowering &  TLI, EVT  VT, bool  LegalOperations, SDNode *  N, SDValue  N0, ISD::LoadExtType  ExtLoadType  )

static

Definition at line 9220 of file DAGCombiner.cpp.

References llvm::LoadSDNode::getBasePtr(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getExtLoad(), llvm::MemSDNode::getMemOperand(), llvm::MemSDNode::getMemoryVT(), llvm::SDValue::getNode(), llvm::SDValue::getValue(), llvm::SDValue::hasOneUse(), llvm::ISD::isEXTLoad(), llvm::TargetLoweringBase::isLoadExtLegal(), llvm::ISD::isSEXTLoad(), llvm::ISD::isUNINDEXEDLoad(), llvm::EVT::isVector(), llvm::MemSDNode::isVolatile(), llvm::ISD::isZEXTLoad(), llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), llvm::ISD::SEXTLOAD, and llvm::SDNode::use_empty().

Referenced by foldExtendedSignBitTest(), and isTruncateOf().

tryToFoldExtOfLoad()

static SDValue tryToFoldExtOfLoad ( SelectionDAG &  DAG, DAGCombiner &  Combiner, const TargetLowering &  TLI, EVT  VT, bool  LegalOperations, SDNode *  N, SDValue  N0, ISD::LoadExtType  ExtLoadType, ISD::NodeType  ExtOpc  )

static

Definition at line 9250 of file DAGCombiner.cpp.

References ExtendUsesToFormExtLoad(), llvm::LoadSDNode::getBasePtr(), llvm::MemSDNode::getChain(), llvm::SelectionDAG::getExtLoad(), llvm::MemSDNode::getMemOperand(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getValue(), llvm::SDValue::getValueType(), llvm::SDValue::hasOneUse(), llvm::TargetLoweringBase::isLoadExtLegal(), llvm::ISD::isNON_EXTLoad(), llvm::ISD::isUNINDEXEDLoad(), llvm::EVT::isVector(), llvm::TargetLoweringBase::isVectorLoadExtDesirable(), isVolatile(), llvm::SelectionDAG::ReplaceAllUsesOfValueWith(), and llvm::ISD::TRUNCATE.

Referenced by foldExtendedSignBitTest(), and isTruncateOf().

visitFMinMax()

static SDValue visitFMinMax ( SelectionDAG &  DAG, SDNode *  N, APFloat(*)(const APFloat &, const APFloat &)  Op  )

static

Definition at line 13103 of file DAGCombiner.cpp.

References llvm::ISD::AND, llvm::ISD::BITCAST, llvm::ISD::BR_CC, llvm::ISD::BRCOND, llvm::ISD::Constant, llvm::object::Equal, llvm::ISD::FABS, llvm::ISD::FCOPYSIGN, llvm::ISD::FNEG, llvm::CondCodeSDNode::get(), llvm::SelectionDAG::getBitcast(), llvm::SelectionDAG::getConstant(), llvm::SelectionDAG::getConstantFP(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDNode::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SDValue::getScalarValueSizeInBits(), llvm::SelectionDAG::getSetCC(), llvm::EVT::getSizeInBits(), llvm::APInt::getSplat(), llvm::HandleSDNode::getValue(), llvm::ConstantFPSDNode::getValueAPF(), llvm::SDValue::getValueType(), llvm::SDNode::getValueType(), llvm::SDValue::hasOneUse(), isConstantFPBuildVectorOrConstantFP(), llvm::isConstOrConstSplatFP(), llvm::TargetLoweringBase::isFAbsFree(), llvm::EVT::isInteger(), llvm::isOneConstant(), llvm::TargetLoweringBase::isOperationLegalOrCustom(), llvm::APInt::isPowerOf2(), llvm::EVT::isVector(), llvm::APInt::logBase2(), llvm::maximum(), llvm::maxnum(), llvm::minimum(), llvm::minnum(), llvm::MVT::Other, llvm::ISD::SETCC, llvm::ISD::SETEQ, llvm::ISD::SETNE, llvm::ISD::SRL, llvm::ISD::TRUNCATE, and llvm::ISD::XOR.

visitORCommutative()

static SDValue visitORCommutative ( SelectionDAG &  DAG, SDValue  N0, SDValue  N1, SDNode *  N  )

static

OR combines for which the commuted variant will be tried as well.

Definition at line 5745 of file DAGCombiner.cpp.

References llvm::ISD::ADD, llvm::ISD::AND, assert(), llvm::ShuffleVectorSDNode::commuteMask(), llvm::dyn_cast(), llvm::SelectionDAG::FoldConstantArithmetic(), llvm::SelectionDAG::getAllOnesConstant(), llvm::ConstantSDNode::getAPIntValue(), getAsNonOpaqueConstant(), llvm::SDNode::getFlags(), llvm::ShuffleVectorSDNode::getMaskElt(), llvm::SDValue::getNode(), llvm::SelectionDAG::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDNode::getOperand(), llvm::SDValue::getValueType(), llvm::EVT::getVectorNumElements(), llvm::SelectionDAG::getVectorShuffle(), llvm::SDNode::hasOneUse(), llvm::SelectionDAG::haveNoCommonBitsSet(), llvm::APInt::intersects(), llvm::isAllOnesConstant(), llvm::isBitwiseNot(), llvm::ISD::isBuildVectorAllOnes(), llvm::ISD::isBuildVectorAllZeros(), llvm::SelectionDAG::isConstantIntBuildVectorOrConstantInt(), llvm::isNullConstant(), llvm::ConstantSDNode::isOpaque(), llvm::TargetLoweringBase::isOperationLegal(), llvm::TargetLoweringBase::isShuffleMaskLegal(), llvm::TargetLoweringBase::isTypeLegal(), llvm::EVT::isVector(), llvm::BitmaskEnumDetail::Mask(), llvm::SelectionDAG::MaskedValueIsZero(), llvm::ISD::matchBinaryPredicate(), llvm::ISD::OR, llvm::AArch64_AM::ROR, and std::swap().

zeroExtendToMatch()

static void zeroExtendToMatch ( APInt &  LHS, APInt &  RHS, unsigned  Offset = 0  )

static

Definition at line 985 of file DAGCombiner.cpp.

References llvm::tgtok::Bits, llvm::APInt::getBitWidth(), llvm::TargetLoweringBase::getBooleanContents(), llvm::SDValue::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDValue::getValueType(), llvm::SDNode::hasOneUse(), llvm::TargetLowering::isConstFalseVal(), llvm::TargetLowering::isConstTrueVal(), llvm::max(), llvm::ISD::SELECT_CC, llvm::ISD::SETCC, llvm::TargetLoweringBase::UndefinedBooleanContent, and llvm::APInt::zextOrSelf().

Referenced by extractShiftForRotate(), and stripTruncAndExt().

Variable Documentation

CombinerAAOnlyFunc

cl::opt<std::string> CombinerAAOnlyFunc("combiner-aa-only-func", cl::Hidden, cl::desc("Only use DAG-combiner alias analysis in this" " function"))

static

CombinerGlobalAA

cl::opt<bool> CombinerGlobalAA("combiner-global-alias-analysis", cl::Hidden, cl::desc("Enable DAG combiner's use of IR alias analysis"))

static

EnableStoreMerging

cl::opt<bool> EnableStoreMerging("combiner-store-merging", cl::Hidden, cl::init(true), cl::desc("DAG combiner enable merging multiple stores " "into a wider store"))

static

Referenced by ShrinkLoadReplaceStoreWithStore().

MaySplitLoadIndex

cl::opt<bool> MaySplitLoadIndex("combiner-split-load-index", cl::Hidden, cl::init(true), cl::desc("DAG combiner may split indexing from loads"))

static

Referenced by numVectorEltsOrZero().

StoreMergeDependenceLimit

cl::opt<unsigned> StoreMergeDependenceLimit("combiner-store-merge-dependence-limit", cl::Hidden, cl::init(10), cl::desc("Limit the number of times for the same StoreNode and RootNode " "to bail out in store merging dependence check"))

static

Referenced by ShrinkLoadReplaceStoreWithStore().

StressLoadSlicing

cl::opt<bool> StressLoadSlicing("combiner-stress-load-slicing", cl::Hidden, cl::desc("Bypass the profitability model of load slicing"), cl::init(false))

static

Hidden option to stress test load slicing, i.e., when this option is enabled, load slicing bypasses most of its profitability guards.

Referenced by isSlicingProfitable().

TokenFactorInlineLimit

cl::opt<unsigned> TokenFactorInlineLimit("combiner-tokenfactor-inline-limit", cl::Hidden, cl::init(2048), cl::desc("Limit the number of operands to inline for Token Factors"))

static

Referenced by getInputChainForNode().

UseTBAA

cl::opt<bool> UseTBAA("combiner-use-tbaa", cl::Hidden, cl::init(true), cl::desc("Enable DAG combiner's use of TBAA"))

static