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thirdparty/capstone/suite/synctools/tablegen/include/llvm/CodeGen/SelectionDAGTargetInfo.h

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+//==- llvm/CodeGen/SelectionDAGTargetInfo.h - SelectionDAG Info --*- C++ -*-==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// 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/MachineMemOperand.h"
+#include "llvm/CodeGen/SelectionDAGNodes.h"
+#include "llvm/Support/CodeGen.h"
+#include <utility>
+
+namespace llvm {
+
+class SelectionDAG;
+
+//===----------------------------------------------------------------------===//
+/// Targets can subclass this to parameterize the
+/// SelectionDAG lowering and instruction selection process.
+///
+class SelectionDAGTargetInfo {
+public:
+  explicit SelectionDAGTargetInfo() = default;
+  SelectionDAGTargetInfo(const SelectionDAGTargetInfo &) = delete;
+  SelectionDAGTargetInfo &operator=(const SelectionDAGTargetInfo &) = delete;
+  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,
+                                          Align Alignment, 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, Align Alignment, 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,
+                                          Align Alignment, bool isVolatile,
+                                          MachinePointerInfo DstPtrInfo) const {
+    return SDValue();
+  }
+
+  /// 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.
+  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());
+  }
+
+  virtual SDValue EmitTargetCodeForSetTag(SelectionDAG &DAG, const SDLoc &dl,
+                                          SDValue Chain, SDValue Addr,
+                                          SDValue Size,
+                                          MachinePointerInfo DstPtrInfo,
+                                          bool ZeroData) const {
+    return SDValue();
+  }
+
+  // Return true if the DAG Combiner should disable generic combines.
+  virtual bool disableGenericCombines(CodeGenOpt::Level OptLevel) const {
+    return false;
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H