LLVM 20.0.0git
Public Member Functions | List of all members
llvm::SelectionDAGTargetInfo Class Reference

Targets can subclass this to parameterize the SelectionDAG lowering and instruction selection process. More...

#include "llvm/CodeGen/SelectionDAGTargetInfo.h"

Inheritance diagram for llvm::SelectionDAGTargetInfo:
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Public Member Functions

 SelectionDAGTargetInfo ()=default
 
 SelectionDAGTargetInfo (const SelectionDAGTargetInfo &)=delete
 
SelectionDAGTargetInfo & operator= (const SelectionDAGTargetInfo &)=delete
 
virtual ~SelectionDAGTargetInfo ()
 
virtual bool isTargetMemoryOpcode (unsigned Opcode) const
 Returns true if a node with the given target-specific opcode has a memory operand.
 
virtual bool isTargetStrictFPOpcode (unsigned Opcode) const
 Returns true if a node with the given target-specific opcode has strict floating-point semantics.
 
virtual bool mayRaiseFPException (unsigned Opcode) const
 Returns true if a node with the given target-specific opcode may raise a floating-point exception.
 
virtual SDValue EmitTargetCodeForMemcpy (SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1, SDValue Op2, SDValue Op3, Align Alignment, bool isVolatile, bool AlwaysInline, MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const
 Emit target-specific code that performs a memcpy.
 
virtual SDValue EmitTargetCodeForMemmove (SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1, SDValue Op2, SDValue Op3, Align Alignment, bool isVolatile, MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const
 Emit target-specific code that performs a memmove.
 
virtual SDValue EmitTargetCodeForMemset (SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1, SDValue Op2, SDValue Op3, Align Alignment, bool isVolatile, bool AlwaysInline, MachinePointerInfo DstPtrInfo) const
 Emit target-specific code that performs a memset.
 
virtual std::pair< SDValue, SDValue > EmitTargetCodeForMemcmp (SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1, SDValue Op2, SDValue Op3, MachinePointerInfo Op1PtrInfo, MachinePointerInfo Op2PtrInfo) const
 Emit target-specific code that performs a memcmp/bcmp, in cases where that is faster than a libcall.
 
virtual std::pair< SDValue, SDValue > EmitTargetCodeForMemchr (SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Src, SDValue Char, SDValue Length, MachinePointerInfo SrcPtrInfo) const
 Emit target-specific code that performs a memchr, in cases where that is faster than a libcall.
 
virtual std::pair< SDValue, SDValue > EmitTargetCodeForStrcpy (SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Dest, SDValue Src, MachinePointerInfo DestPtrInfo, MachinePointerInfo SrcPtrInfo, bool isStpcpy) const
 Emit target-specific code that performs a strcpy or stpcpy, in cases where that is faster than a libcall.
 
virtual std::pair< SDValue, SDValue > EmitTargetCodeForStrcmp (SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1, SDValue Op2, MachinePointerInfo Op1PtrInfo, MachinePointerInfo Op2PtrInfo) const
 Emit target-specific code that performs a strcmp, in cases where that is faster than a libcall.
 
virtual std::pair< SDValue, SDValue > EmitTargetCodeForStrlen (SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Src, MachinePointerInfo SrcPtrInfo) const
 
virtual std::pair< SDValue, SDValue > EmitTargetCodeForStrnlen (SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Src, SDValue MaxLength, MachinePointerInfo SrcPtrInfo) const
 
virtual SDValue EmitTargetCodeForSetTag (SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Addr, SDValue Size, MachinePointerInfo DstPtrInfo, bool ZeroData) const
 
virtual bool disableGenericCombines (CodeGenOptLevel OptLevel) const
 

Detailed Description

Targets can subclass this to parameterize the SelectionDAG lowering and instruction selection process.

Definition at line 31 of file SelectionDAGTargetInfo.h.

Constructor & Destructor Documentation

◆ SelectionDAGTargetInfo() [1/2]

llvm::SelectionDAGTargetInfo::SelectionDAGTargetInfo ( )
explicitdefault

◆ SelectionDAGTargetInfo() [2/2]

llvm::SelectionDAGTargetInfo::SelectionDAGTargetInfo ( const SelectionDAGTargetInfo &  )
delete

◆ ~SelectionDAGTargetInfo()

SelectionDAGTargetInfo::~SelectionDAGTargetInfo ( )
virtualdefault

Member Function Documentation

◆ disableGenericCombines()

virtual bool llvm::SelectionDAGTargetInfo::disableGenericCombines ( CodeGenOptLevel  OptLevel) const
inlinevirtual

Definition at line 174 of file SelectionDAGTargetInfo.h.

◆ EmitTargetCodeForMemchr()

virtual std::pair< SDValue, SDValue > llvm::SelectionDAGTargetInfo::EmitTargetCodeForMemchr ( SelectionDAG &  DAG,
const SDLoc &  dl,
SDValue  Chain,
SDValue  Src,
SDValue  Char,
SDValue  Length,
MachinePointerInfo  SrcPtrInfo 
) const
inlinevirtual

Emit target-specific code that performs a memchr, in cases where that is faster than a libcall.

The first returned SDValue is the result of the memchr and the second is the chain. Both SDValues can be null if a normal libcall should be used.

Reimplemented in llvm::SystemZSelectionDAGInfo.

Definition at line 120 of file SelectionDAGTargetInfo.h.

◆ EmitTargetCodeForMemcmp()

virtual std::pair< SDValue, SDValue > llvm::SelectionDAGTargetInfo::EmitTargetCodeForMemcmp ( SelectionDAG &  DAG,
const SDLoc &  dl,
SDValue  Chain,
SDValue  Op1,
SDValue  Op2,
SDValue  Op3,
MachinePointerInfo  Op1PtrInfo,
MachinePointerInfo  Op2PtrInfo 
) const
inlinevirtual

Emit target-specific code that performs a memcmp/bcmp, in cases where that is faster than a libcall.

The first returned SDValue is the result of the memcmp and the second is the chain. Both SDValues can be null if a normal libcall should be used.

Reimplemented in llvm::SystemZSelectionDAGInfo.

Definition at line 108 of file SelectionDAGTargetInfo.h.

◆ EmitTargetCodeForMemcpy()

virtual SDValue llvm::SelectionDAGTargetInfo::EmitTargetCodeForMemcpy ( SelectionDAG &  DAG,
const SDLoc &  dl,
SDValue  Chain,
SDValue  Op1,
SDValue  Op2,
SDValue  Op3,
Align  Alignment,
bool  isVolatile,
bool  AlwaysInline,
MachinePointerInfo  DstPtrInfo,
MachinePointerInfo  SrcPtrInfo 
) const
inlinevirtual

Emit target-specific code that performs a memcpy.

This can be used by targets to provide code sequences for cases that don't fit the target's parameters for simple loads/stores and can be more efficient than using a library call. This function can return a null SDValue if the target declines to use custom code and a different lowering strategy should be used.

If AlwaysInline is true, the size is constant and the target should not emit any calls and is strongly encouraged to attempt to emit inline code even if it is beyond the usual threshold because this intrinsic is being expanded in a place where calls are not feasible (e.g. within the prologue for another call). If the target chooses to decline an AlwaysInline request here, legalize will resort to using simple loads and stores.

Reimplemented in llvm::AArch64SelectionDAGInfo, llvm::ARMSelectionDAGInfo, llvm::BPFSelectionDAGInfo, llvm::HexagonSelectionDAGInfo, llvm::LanaiSelectionDAGInfo, llvm::SystemZSelectionDAGInfo, llvm::X86SelectionDAGInfo, llvm::WebAssemblySelectionDAGInfo, and llvm::XCoreSelectionDAGInfo.

Definition at line 64 of file SelectionDAGTargetInfo.h.

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

◆ EmitTargetCodeForMemmove()

virtual SDValue llvm::SelectionDAGTargetInfo::EmitTargetCodeForMemmove ( SelectionDAG &  DAG,
const SDLoc &  dl,
SDValue  Chain,
SDValue  Op1,
SDValue  Op2,
SDValue  Op3,
Align  Alignment,
bool  isVolatile,
MachinePointerInfo  DstPtrInfo,
MachinePointerInfo  SrcPtrInfo 
) const
inlinevirtual

Emit target-specific code that performs a memmove.

This can be used by targets to provide code sequences for cases that don't fit the target's parameters for simple loads/stores and can be more efficient than using a library call. This function can return a null SDValue if the target declines to use custom code and a different lowering strategy should be used.

Reimplemented in llvm::AArch64SelectionDAGInfo, llvm::ARMSelectionDAGInfo, and llvm::WebAssemblySelectionDAGInfo.

Definition at line 80 of file SelectionDAGTargetInfo.h.

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

◆ EmitTargetCodeForMemset()

virtual SDValue llvm::SelectionDAGTargetInfo::EmitTargetCodeForMemset ( SelectionDAG &  DAG,
const SDLoc &  dl,
SDValue  Chain,
SDValue  Op1,
SDValue  Op2,
SDValue  Op3,
Align  Alignment,
bool  isVolatile,
bool  AlwaysInline,
MachinePointerInfo  DstPtrInfo 
) const
inlinevirtual

Emit target-specific code that performs a memset.

This can be used by targets to provide code sequences for cases that don't fit the target's parameters for simple stores and can be more efficient than using a library call. This function can return a null SDValue if the target declines to use custom code and a different lowering strategy should be used. Note that if AlwaysInline is true the function has to return a valid SDValue.

Reimplemented in llvm::SystemZSelectionDAGInfo, llvm::AArch64SelectionDAGInfo, llvm::X86SelectionDAGInfo, llvm::ARMSelectionDAGInfo, and llvm::WebAssemblySelectionDAGInfo.

Definition at line 94 of file SelectionDAGTargetInfo.h.

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

◆ EmitTargetCodeForSetTag()

virtual SDValue llvm::SelectionDAGTargetInfo::EmitTargetCodeForSetTag ( SelectionDAG &  DAG,
const SDLoc &  dl,
SDValue  Chain,
SDValue  Addr,
SDValue  Size,
MachinePointerInfo  DstPtrInfo,
bool  ZeroData 
) const
inlinevirtual

Reimplemented in llvm::AArch64SelectionDAGInfo.

Definition at line 165 of file SelectionDAGTargetInfo.h.

◆ EmitTargetCodeForStrcmp()

virtual std::pair< SDValue, SDValue > llvm::SelectionDAGTargetInfo::EmitTargetCodeForStrcmp ( SelectionDAG &  DAG,
const SDLoc &  dl,
SDValue  Chain,
SDValue  Op1,
SDValue  Op2,
MachinePointerInfo  Op1PtrInfo,
MachinePointerInfo  Op2PtrInfo 
) const
inlinevirtual

Emit target-specific code that performs a strcmp, in cases where that is faster than a libcall.

The first returned SDValue is the result of the strcmp and the second is the chain. Both SDValues can be null if a normal libcall should be used.

Reimplemented in llvm::SystemZSelectionDAGInfo.

Definition at line 145 of file SelectionDAGTargetInfo.h.

◆ EmitTargetCodeForStrcpy()

virtual std::pair< SDValue, SDValue > llvm::SelectionDAGTargetInfo::EmitTargetCodeForStrcpy ( SelectionDAG &  DAG,
const SDLoc &  DL,
SDValue  Chain,
SDValue  Dest,
SDValue  Src,
MachinePointerInfo  DestPtrInfo,
MachinePointerInfo  SrcPtrInfo,
bool  isStpcpy 
) const
inlinevirtual

Emit target-specific code that performs a strcpy or stpcpy, in cases where that is faster than a libcall.

The first returned SDValue is the result of the copy (the start of the destination string for strcpy, a pointer to the null terminator for stpcpy) and the second is the chain. Both SDValues can be null if a normal libcall should be used.

Reimplemented in llvm::SystemZSelectionDAGInfo.

Definition at line 133 of file SelectionDAGTargetInfo.h.

◆ EmitTargetCodeForStrlen()

virtual std::pair< SDValue, SDValue > llvm::SelectionDAGTargetInfo::EmitTargetCodeForStrlen ( SelectionDAG &  DAG,
const SDLoc &  DL,
SDValue  Chain,
SDValue  Src,
MachinePointerInfo  SrcPtrInfo 
) const
inlinevirtual

Reimplemented in llvm::SystemZSelectionDAGInfo.

Definition at line 153 of file SelectionDAGTargetInfo.h.

◆ EmitTargetCodeForStrnlen()

virtual std::pair< SDValue, SDValue > llvm::SelectionDAGTargetInfo::EmitTargetCodeForStrnlen ( SelectionDAG &  DAG,
const SDLoc &  DL,
SDValue  Chain,
SDValue  Src,
SDValue  MaxLength,
MachinePointerInfo  SrcPtrInfo 
) const
inlinevirtual

Reimplemented in llvm::SystemZSelectionDAGInfo.

Definition at line 159 of file SelectionDAGTargetInfo.h.

◆ isTargetMemoryOpcode()

virtual bool llvm::SelectionDAGTargetInfo::isTargetMemoryOpcode ( unsigned  Opcode) const
inlinevirtual

Returns true if a node with the given target-specific opcode has a memory operand.

Nodes with such opcodes can only be created with SelectionDAG::getMemIntrinsicNode.

Reimplemented in llvm::AArch64SelectionDAGInfo, llvm::AMDGPUSelectionDAGInfo, llvm::ARMSelectionDAGInfo, llvm::MipsSelectionDAGInfo, llvm::NVPTXSelectionDAGInfo, llvm::PPCSelectionDAGInfo, llvm::RISCVSelectionDAGInfo, llvm::SystemZSelectionDAGInfo, llvm::WebAssemblySelectionDAGInfo, and llvm::X86SelectionDAGInfo.

Definition at line 41 of file SelectionDAGTargetInfo.h.

Referenced by llvm::SelectionDAG::getMemIntrinsicNode(), and mayRaiseFPException().

◆ isTargetStrictFPOpcode()

virtual bool llvm::SelectionDAGTargetInfo::isTargetStrictFPOpcode ( unsigned  Opcode) const
inlinevirtual

Returns true if a node with the given target-specific opcode has strict floating-point semantics.

Reimplemented in llvm::AArch64SelectionDAGInfo, llvm::PPCSelectionDAGInfo, llvm::RISCVSelectionDAGInfo, llvm::SystemZSelectionDAGInfo, and llvm::X86SelectionDAGInfo.

Definition at line 45 of file SelectionDAGTargetInfo.h.

Referenced by combineCVTP2I_CVTTP2I(), combineFMA(), combineVFMADD_VLWithVFNEG_VL(), mayRaiseFPException(), and performVFMADD_VLCombine().

◆ mayRaiseFPException()

bool SelectionDAGTargetInfo::mayRaiseFPException ( unsigned  Opcode) const
virtual

Returns true if a node with the given target-specific opcode may raise a floating-point exception.

Definition at line 19 of file SelectionDAGTargetInfo.cpp.

References isTargetMemoryOpcode(), and isTargetStrictFPOpcode().

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

◆ operator=()

SelectionDAGTargetInfo & llvm::SelectionDAGTargetInfo::operator= ( const SelectionDAGTargetInfo &  )
delete
The documentation for this class was generated from the following files:
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