LLVM  4.0.0
Public Member Functions | Public Attributes | List of all members
llvm::TargetLowering::TargetLoweringOpt Struct Reference

A convenience struct that encapsulates a DAG, and two SDValues for returning information from TargetLowering to its clients that want to combine. More...

#include <TargetLowering.h>

Collaboration diagram for llvm::TargetLowering::TargetLoweringOpt:
[legend]

Public Member Functions

 TargetLoweringOpt (SelectionDAG &InDAG, bool LT, bool LO)
 
bool LegalTypes () const
 
bool LegalOperations () const
 
bool CombineTo (SDValue O, SDValue N)
 
bool ShrinkDemandedConstant (SDValue Op, const APInt &Demanded)
 Check to see if the specified operand of the specified instruction is a constant integer. More...
 
bool ShrinkDemandedOp (SDValue Op, unsigned BitWidth, const APInt &Demanded, const SDLoc &dl)
 Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free. More...
 
bool SimplifyDemandedBits (SDNode *User, unsigned OpIdx, const APInt &Demanded, DAGCombinerInfo &DCI)
 Helper for SimplifyDemandedBits that can simplify an operation with multiple uses. More...
 

Public Attributes

SelectionDAGDAG
 
bool LegalTys
 
bool LegalOps
 
SDValue Old
 
SDValue New
 

Detailed Description

A convenience struct that encapsulates a DAG, and two SDValues for returning information from TargetLowering to its clients that want to combine.

Definition at line 2310 of file TargetLowering.h.

Constructor & Destructor Documentation

llvm::TargetLowering::TargetLoweringOpt::TargetLoweringOpt ( SelectionDAG InDAG,
bool  LT,
bool  LO 
)
inlineexplicit

Definition at line 2317 of file TargetLowering.h.

Member Function Documentation

bool llvm::TargetLowering::TargetLoweringOpt::CombineTo ( SDValue  O,
SDValue  N 
)
inline

Definition at line 2324 of file TargetLowering.h.

References N, New, and Old.

Referenced by llvm::TargetLowering::SimplifyDemandedBits().

bool llvm::TargetLowering::TargetLoweringOpt::LegalOperations ( ) const
inline

Definition at line 2322 of file TargetLowering.h.

References LegalOps.

bool llvm::TargetLowering::TargetLoweringOpt::LegalTypes ( ) const
inline

Definition at line 2321 of file TargetLowering.h.

References LegalTys.

bool TargetLowering::TargetLoweringOpt::ShrinkDemandedConstant ( SDValue  Op,
const APInt Demanded 
)

Check to see if the specified operand of the specified instruction is a constant integer.

If so, check to see if there are any bits set in the constant that are not demanded. If so, shrink the constant and return true.

Definition at line 340 of file TargetLowering.cpp.

References llvm::ISD::AND, C, llvm::dyn_cast(), llvm::ConstantSDNode::getAPIntValue(), llvm::SDValue::getNode(), llvm::SDValue::getOpcode(), llvm::SDValue::getOperand(), llvm::SDValue::getValueType(), llvm::APInt::intersects(), llvm::ISD::OR, and llvm::ISD::XOR.

Referenced by llvm::TargetLowering::SimplifyDemandedBits().

bool TargetLowering::TargetLoweringOpt::ShrinkDemandedOp ( SDValue  Op,
unsigned  BitWidth,
const APInt Demanded,
const SDLoc dl 
)
bool TargetLowering::TargetLoweringOpt::SimplifyDemandedBits ( SDNode User,
unsigned  OpIdx,
const APInt Demanded,
DAGCombinerInfo DCI 
)

Helper for SimplifyDemandedBits that can simplify an operation with multiple uses.

This function uses TLI.SimplifyDemandedBits to simplify Operand OpIdx of User and then updated User with the simplified version. No other uses of OpIdx are updated. If User is the only user of OpIdx, this function behaves exactly like TLI.SimplifyDemandedBits except that it also updates the DAG by calling DCI.CommitTargetLoweringOpt.

Definition at line 422 of file TargetLowering.cpp.

References llvm::TargetLowering::DAGCombinerInfo::AddToWorklist(), assert(), llvm::TargetLowering::DAGCombinerInfo::CommitTargetLoweringOpt(), llvm::SDValue::getNode(), llvm::SDNode::getNumOperands(), llvm::SDNode::getOperand(), i, llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), and llvm::TargetLowering::SimplifyDemandedBits().

Referenced by simplifyI24().

Member Data Documentation

SelectionDAG& llvm::TargetLowering::TargetLoweringOpt::DAG

Definition at line 2311 of file TargetLowering.h.

Referenced by llvm::TargetLowering::SimplifyDemandedBits().

bool llvm::TargetLowering::TargetLoweringOpt::LegalOps

Definition at line 2313 of file TargetLowering.h.

Referenced by LegalOperations().

bool llvm::TargetLowering::TargetLoweringOpt::LegalTys

Definition at line 2312 of file TargetLowering.h.

Referenced by LegalTypes().

SDValue llvm::TargetLowering::TargetLoweringOpt::New

Definition at line 2315 of file TargetLowering.h.

Referenced by CombineTo().

SDValue llvm::TargetLowering::TargetLoweringOpt::Old

Definition at line 2314 of file TargetLowering.h.

Referenced by CombineTo().


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