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//==-- llvm/Target/TargetSelectionDAGInfo.h - SelectionDAG Info --*- C++ -*-==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the TargetSelectionDAGInfo class, which targets can
// subclass to parameterize the SelectionDAG lowering and instruction
// selection process.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETSELECTIONDAGINFO_H
#define LLVM_TARGET_TARGETSELECTIONDAGINFO_H
#include "llvm/CodeGen/SelectionDAGNodes.h"
namespace llvm {
//===----------------------------------------------------------------------===//
/// Targets can subclass this to parameterize the
/// SelectionDAG lowering and instruction selection process.
///
class TargetSelectionDAGInfo {
TargetSelectionDAGInfo(const TargetSelectionDAGInfo &) = delete;
void operator=(const TargetSelectionDAGInfo &) = delete;
public:
explicit TargetSelectionDAGInfo() = default;
virtual ~TargetSelectionDAGInfo();
/// 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.
virtual SDValue
EmitTargetCodeForMemcpy(SelectionDAG &DAG, SDLoc dl,
SDValue Chain,
SDValue Op1, SDValue Op2,
SDValue Op3, unsigned Align, bool isVolatile,
bool AlwaysInline,
MachinePointerInfo DstPtrInfo,
MachinePointerInfo SrcPtrInfo) const {
return SDValue();
}
/// 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.
virtual SDValue
EmitTargetCodeForMemmove(SelectionDAG &DAG, SDLoc dl,
SDValue Chain,
SDValue Op1, SDValue Op2,
SDValue Op3, unsigned Align, bool isVolatile,
MachinePointerInfo DstPtrInfo,
MachinePointerInfo SrcPtrInfo) const {
return SDValue();
}
/// 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.
virtual SDValue
EmitTargetCodeForMemset(SelectionDAG &DAG, SDLoc dl,
SDValue Chain,
SDValue Op1, SDValue Op2,
SDValue Op3, unsigned Align, bool isVolatile,
MachinePointerInfo DstPtrInfo) const {
return SDValue();
}
/// Emit target-specific code that performs a memcmp, 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.
virtual std::pair<SDValue, SDValue>
EmitTargetCodeForMemcmp(SelectionDAG &DAG, SDLoc dl,
SDValue Chain,
SDValue Op1, SDValue Op2,
SDValue Op3, MachinePointerInfo Op1PtrInfo,
MachinePointerInfo Op2PtrInfo) const {
return std::make_pair(SDValue(), SDValue());
}
/// 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.
virtual std::pair<SDValue, SDValue>
EmitTargetCodeForMemchr(SelectionDAG &DAG, SDLoc dl, SDValue Chain,
SDValue Src, SDValue Char, SDValue Length,
MachinePointerInfo SrcPtrInfo) const {
return std::make_pair(SDValue(), SDValue());
}
/// 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.
virtual std::pair<SDValue, SDValue>
EmitTargetCodeForStrcpy(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
SDValue Dest, SDValue Src,
MachinePointerInfo DestPtrInfo,
MachinePointerInfo SrcPtrInfo,
bool isStpcpy) const {
return std::make_pair(SDValue(), SDValue());
}
/// 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.
virtual std::pair<SDValue, SDValue>
EmitTargetCodeForStrcmp(SelectionDAG &DAG, SDLoc dl,
SDValue Chain,
SDValue Op1, SDValue Op2,
MachinePointerInfo Op1PtrInfo,
MachinePointerInfo Op2PtrInfo) const {
return std::make_pair(SDValue(), SDValue());
}
virtual std::pair<SDValue, SDValue>
EmitTargetCodeForStrlen(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
SDValue Src, MachinePointerInfo SrcPtrInfo) const {
return std::make_pair(SDValue(), SDValue());
}
virtual std::pair<SDValue, SDValue>
EmitTargetCodeForStrnlen(SelectionDAG &DAG, SDLoc DL, SDValue Chain,
SDValue Src, SDValue MaxLength,
MachinePointerInfo SrcPtrInfo) const {
return std::make_pair(SDValue(), SDValue());
}
};
} // end llvm namespace
#endif
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