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Diffstat (limited to 'include/llvm/CodeGen/SelectionDAGTargetInfo.h')
| -rw-r--r-- | include/llvm/CodeGen/SelectionDAGTargetInfo.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/SelectionDAGTargetInfo.h b/include/llvm/CodeGen/SelectionDAGTargetInfo.h new file mode 100644 index 000000000000..ac5092af8def --- /dev/null +++ b/include/llvm/CodeGen/SelectionDAGTargetInfo.h @@ -0,0 +1,156 @@ +//==-- llvm/CodeGen/SelectionDAGTargetInfo.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 SelectionDAGTargetInfo class, which targets can +// subclass to parameterize the SelectionDAG lowering and instruction +// selection process. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H +#define LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H + +#include "llvm/CodeGen/SelectionDAGNodes.h" +#include "llvm/Support/CodeGen.h" + +namespace llvm { + +//===----------------------------------------------------------------------===// +/// Targets can subclass this to parameterize the +/// SelectionDAG lowering and instruction selection process. +/// +class SelectionDAGTargetInfo { + SelectionDAGTargetInfo(const SelectionDAGTargetInfo &) = delete; + void operator=(const SelectionDAGTargetInfo &) = delete; + +public: + explicit SelectionDAGTargetInfo() = default; + virtual ~SelectionDAGTargetInfo(); + + /// 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, const 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, const 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, const 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, const 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, const 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, const 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, const 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, const SDLoc &DL, SDValue Chain, + SDValue Src, MachinePointerInfo SrcPtrInfo) const { + return std::make_pair(SDValue(), SDValue()); + } + + virtual std::pair<SDValue, SDValue> + EmitTargetCodeForStrnlen(SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, + SDValue Src, SDValue MaxLength, + MachinePointerInfo SrcPtrInfo) const { + return std::make_pair(SDValue(), SDValue()); + } + // Return true when the decision to generate FMA's (or FMS, FMLA etc) rather + // than FMUL and ADD is delegated to the machine combiner. + virtual bool generateFMAsInMachineCombiner(CodeGenOpt::Level OptLevel) const { + return false; + } +}; + +} // end llvm namespace + +#endif |