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LLVM
3.7.0
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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>
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, SDLoc dl) |
| Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free. More... | |
Public Attributes | |
| SelectionDAG & | DAG |
| bool | LegalTys |
| bool | LegalOps |
| SDValue | Old |
| SDValue | New |
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 2102 of file TargetLowering.h.
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inlineexplicit |
Definition at line 2109 of file TargetLowering.h.
Definition at line 2116 of file TargetLowering.h.
Referenced by llvm::TargetLowering::SimplifyDemandedBits().
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inline |
Definition at line 2114 of file TargetLowering.h.
References LegalOps.
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inline |
Definition at line 2113 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.
ShrinkDemandedConstant - 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 286 of file TargetLowering.cpp.
References llvm::ISD::AND, llvm::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, | ||
| SDLoc | dl | ||
| ) |
Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free.
ShrinkDemandedOp - Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free.
This uses isZExtFree and ZERO_EXTEND for the widening cast, but it could be generalized for targets with other types of implicit widening casts.
Definition at line 325 of file TargetLowering.cpp.
References llvm::ISD::ANY_EXTEND, llvm::APInt::countLeadingZeros(), llvm::EVT::getIntegerVT(), llvm::SDValue::getNode(), llvm::SDValue::getNumOperands(), llvm::SDNode::getNumValues(), llvm::SDValue::getOpcode(), llvm::SDNode::getOperand(), llvm::SDValue::getValueType(), llvm::SDNode::hasOneUse(), llvm::isPowerOf2_32(), llvm::TargetLoweringBase::isTruncateFree(), llvm::EVT::isVector(), llvm::TargetLoweringBase::isZExtFree(), llvm::NextPowerOf2(), llvm::ISD::TRUNCATE, X, and llvm::ISD::ZERO_EXTEND.
| SelectionDAG& llvm::TargetLowering::TargetLoweringOpt::DAG |
Definition at line 2103 of file TargetLowering.h.
Referenced by llvm::TargetLowering::SimplifyDemandedBits().
| bool llvm::TargetLowering::TargetLoweringOpt::LegalOps |
Definition at line 2105 of file TargetLowering.h.
Referenced by LegalOperations().
| bool llvm::TargetLowering::TargetLoweringOpt::LegalTys |
Definition at line 2104 of file TargetLowering.h.
Referenced by LegalTypes().
| SDValue llvm::TargetLowering::TargetLoweringOpt::New |
Definition at line 2107 of file TargetLowering.h.
Referenced by CombineTo().
| SDValue llvm::TargetLowering::TargetLoweringOpt::Old |
Definition at line 2106 of file TargetLowering.h.
Referenced by CombineTo().
1.8.6