LLVM: llvm::BuildVectorSDNode Class Reference (original) (raw)

A "pseudo-class" with methods for operating on BUILD_VECTORs. More...

#include "[llvm/CodeGen/SelectionDAGNodes.h](SelectionDAGNodes%5F8h%5Fsource.html)"

A "pseudo-class" with methods for operating on BUILD_VECTORs.

Definition at line 2215 of file SelectionDAGNodes.h.

◆ classof()

◆ getConstantFPSplatNode() [1/2]

Returns the splatted constant FP or null if this is not a constant FP splat.

If passed a non-null UndefElements bitvector, it will resize it to match the vector width and set the bits where elements are undef.

Definition at line 13892 of file SelectionDAG.cpp.

References llvm::dyn_cast_or_null(), and getSplatValue().

◆ getConstantFPSplatNode() [2/2]

Returns the demanded splatted constant FP or null if this is not a constant FP splat.

The DemandedElts mask indicates the elements that must be in the splat. If passed a non-null UndefElements bitvector, it will resize it to match the vector width and set the bits where elements are undef.

Definition at line 13885 of file SelectionDAG.cpp.

References llvm::dyn_cast_or_null(), and getSplatValue().

◆ getConstantFPSplatPow2ToLog2Int()

◆ getConstantRawBits()

Extract the raw bit data from a build vector of Undef, Constant or ConstantFP node elements.

Each raw bit element will be DstEltSizeInBits wide, undef elements are treated as zero, and entirely undefined elements are flagged in UndefElements.

Definition at line 13914 of file SelectionDAG.cpp.

References assert(), llvm::dyn_cast(), llvm::SDNode::getNumOperands(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDNode::getValueType(), llvm::APInt::getZero(), I, isConstant(), recastRawBits(), and llvm::BitVector::set().

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

◆ getConstantSplatNode() [1/2]

Returns the splatted constant or null if this is not a constant splat.

If passed a non-null UndefElements bitvector, it will resize it to match the vector width and set the bits where elements are undef.

Definition at line 13880 of file SelectionDAG.cpp.

References llvm::dyn_cast_or_null(), and getSplatValue().

◆ getConstantSplatNode() [2/2]

◆ getRepeatedSequence() [1/2]

Find the shortest repeating sequence of values in the build vector.

e.g. { u, X, u, X, u, u, X, u } -> { X } { X, Y, u, Y, u, u, X, u } -> { X, Y }

Currently this must be a power-of-2 build vector. The DemandedElts mask indicates the elements that must be present, undemanded elements in Sequence may be null (SDValue()). If passed a non-null UndefElements bitvector, it will resize it to match the original vector width and set the bits where elements are undef. If result is false, Sequence will be empty.

Definition at line 13820 of file SelectionDAG.cpp.

References AbstractManglingParser< Derived, Alloc >::NumOps, assert(), llvm::BitVector::clear(), llvm::APInt::getBitWidth(), llvm::SDNode::getNumOperands(), llvm::SDNode::getOperand(), I, llvm::isPowerOf2_32(), llvm::SDNode::isUndef(), llvm::SDValue::isUndef(), llvm::BitVector::resize(), and SDValue().

Referenced by getRepeatedSequence(), and lowerBuildVectorAsBroadcast().

◆ getRepeatedSequence() [2/2]

Find the shortest repeating sequence of values in the build vector.

e.g. { u, X, u, X, u, u, X, u } -> { X } { X, Y, u, Y, u, u, X, u } -> { X, Y }

Currently this must be a power-of-2 build vector. If passed a non-null UndefElements bitvector, it will resize it to match the original vector width and set the bits where elements are undef. If result is false, Sequence will be empty.

Definition at line 13866 of file SelectionDAG.cpp.

References llvm::APInt::getAllOnes(), llvm::SDNode::getNumOperands(), and getRepeatedSequence().

◆ getSplatValue() [1/2]

◆ getSplatValue() [2/2]

Returns the demanded splatted value or a null value if this is not a splat.

The DemandedElts mask indicates the elements that must be in the splat. If passed a non-null UndefElements bitvector, it will resize it to match the vector width and set the bits where elements are undef.

Definition at line 13780 of file SelectionDAG.cpp.

References AbstractManglingParser< Derived, Alloc >::NumOps, assert(), llvm::BitVector::clear(), llvm::APInt::countr_zero(), llvm::APInt::getBitWidth(), llvm::SDNode::getNumOperands(), llvm::SDNode::getOperand(), llvm::SDNode::isUndef(), llvm::BitVector::resize(), and SDValue().

Referenced by combineGatherScatter(), combinePExtTruncate(), createMMXBuildVector(), getConstantFPSplatNode(), getConstantFPSplatNode(), getConstantFPSplatPow2ToLog2Int(), getConstantSplatNode(), getConstantSplatNode(), getSplatValue(), llvm::SelectionDAG::getVectorShuffle(), and lowerVECTOR_SHUFFLE().

◆ isConstant()

◆ isConstantSequence()

If this BuildVector is constant and represents the numerical series "<a, a+n, a+2n, a+3n, ...>" where a is integer and n is a non-zero integer, the value "<a,n>" is returned.

Definition at line 14014 of file SelectionDAG.cpp.

References AbstractManglingParser< Derived, Alloc >::NumOps, llvm::SDNode::getConstantOperandAPInt(), llvm::SDNode::getNumOperands(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::SDNode::getValueType(), llvm::isa(), llvm::APInt::isZero(), and llvm::APInt::trunc().

◆ isConstantSplat()

Check if this is a constant splat, and if so, find the smallest element size that splats the vector.

If MinSplatBits is nonzero, the element size must be at least that large. Note that the splat element may be the entire vector (i.e., a one element vector). Returns the splat element value in SplatValue. Any undefined bits in that value are zero, and the corresponding bits in the SplatUndef mask are set. The SplatBitSize value is set to the splat element size in bits. HasAnyUndefs is set to true if any bits in the vector are undefined. isBigEndian describes the endianness of the target.

Definition at line 13704 of file SelectionDAG.cpp.

References AbstractManglingParser< Derived, Alloc >::NumOps, assert(), llvm::dyn_cast(), llvm::APInt::extractBits(), llvm::SDNode::getNumOperands(), llvm::SDNode::getOperand(), llvm::EVT::getScalarSizeInBits(), llvm::EVT::getSizeInBits(), llvm::SDNode::getValueType(), llvm::APInt::insertBits(), llvm::SDValue::isUndef(), llvm::EVT::isVector(), and llvm::APInt::setBits().

Referenced by getVShiftAmt(), getVShiftImm(), getVShiftImm(), INITIALIZE_PASS(), isVectorAllOnes(), lowerBuildVectorAsBroadcast(), PerformANDCombine(), llvm::PPCTargetLowering::PerformDAGCombine(), performDSPShiftCombine(), PerformORCombine(), resolveBuildVector(), llvm::SystemZVectorConstantInfo::SystemZVectorConstantInfo(), and tryCombineShiftImm().

◆ recastRawBits()

Recast bit data SrcBitElements to DstEltSizeInBits wide elements.

Undef elements are treated as zero, and entirely undefined elements are flagged in DstUndefElements.

Definition at line 13950 of file SelectionDAG.cpp.

References assert(), llvm::SmallVectorImpl< T >::assign(), llvm::BitVector::clear(), llvm::APInt::extractBits(), llvm::APInt::getBitWidth(), llvm::APInt::getZero(), I, llvm::APInt::insertBits(), llvm::BitVector::reset(), llvm::BitVector::resize(), llvm::BitVector::set(), llvm::ArrayRef< T >::size(), and llvm::BitVector::size().

Referenced by llvm::SelectionDAG::FoldConstantArithmetic(), and getConstantRawBits().

The documentation for this class was generated from the following files:

• include/llvm/CodeGen/SelectionDAGNodes.h
• lib/CodeGen/SelectionDAG/SelectionDAG.cpp