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e1a5bc775e
alignment and volatility information, such as loads and stores, to reduce the number of integer values added to the FoldingSetNodeID. llvm-svn: 55058
87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
//==- llvm/CodeGen/MachineMemOperand.h - MachineMemOperand class -*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declaration of the MachineMemOperand class, which is a
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// description of a memory reference. It is used to help track dependencies
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// in the backend.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINEMEMOPERAND_H
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#define LLVM_CODEGEN_MACHINEMEMOPERAND_H
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namespace llvm {
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class Value;
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class FoldingSetNodeID;
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//===----------------------------------------------------------------------===//
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/// MachineMemOperand - A description of a memory reference used in the backend.
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/// Instead of holding a StoreInst or LoadInst, this class holds the address
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/// Value of the reference along with a byte size and offset. This allows it
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/// to describe lowered loads and stores. Also, the special PseudoSourceValue
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/// objects can be used to represent loads and stores to memory locations
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/// that aren't explicit in the regular LLVM IR.
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///
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class MachineMemOperand {
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int64_t Offset;
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uint64_t Size;
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const Value *V;
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unsigned int Flags;
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public:
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/// Flags values. These may be or'd together.
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enum MemOperandFlags {
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/// The memory access reads data.
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MOLoad = 1,
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/// The memory access writes data.
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MOStore = 2,
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/// The memory access is volatile.
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MOVolatile = 4
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};
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/// MachineMemOperand - Construct an MachineMemOperand object with the
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/// specified address Value, flags, offset, size, and alignment.
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MachineMemOperand(const Value *v, unsigned int f, int64_t o, uint64_t s,
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unsigned int a);
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/// getValue - Return the base address of the memory access.
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/// Special values are PseudoSourceValue::FPRel, PseudoSourceValue::SPRel,
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/// and the other PseudoSourceValue members which indicate references to
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/// frame/stack pointer relative references and other special references.
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const Value *getValue() const { return V; }
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/// getFlags - Return the raw flags of the source value, \see MemOperandFlags.
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unsigned int getFlags() const { return Flags & 7; }
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/// getOffset - For normal values, this is a byte offset added to the base
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/// address. For PseudoSourceValue::FPRel values, this is the FrameIndex
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/// number.
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int64_t getOffset() const { return Offset; }
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/// getSize - Return the size in bytes of the memory reference.
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uint64_t getSize() const { return Size; }
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/// getAlignment - Return the minimum known alignment in bytes of the
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/// memory reference.
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unsigned int getAlignment() const { return (1u << (Flags >> 3)) >> 1; }
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bool isLoad() const { return Flags & MOLoad; }
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bool isStore() const { return Flags & MOStore; }
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bool isVolatile() const { return Flags & MOVolatile; }
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/// Profile - Gather unique data for the object.
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///
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void Profile(FoldingSetNodeID &ID) const;
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};
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} // End llvm namespace
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#endif
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