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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306717 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
//===- llvm/Transforms/Utils/OrderedInstructions.h -------------*- 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 defines an efficient way to check for dominance relation between 2
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// instructions.
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//
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// This interface dispatches to appropriate dominance check given 2
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// instructions, i.e. in case the instructions are in the same basic block,
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// OrderedBasicBlock (with instruction numbering and caching) are used.
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// Otherwise, dominator tree is used.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H
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#define LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Analysis/OrderedBasicBlock.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Operator.h"
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namespace llvm {
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class OrderedInstructions {
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/// Used to check dominance for instructions in same basic block.
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mutable DenseMap<const BasicBlock *, std::unique_ptr<OrderedBasicBlock>>
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OBBMap;
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/// The dominator tree of the parent function.
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DominatorTree *DT;
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public:
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/// Constructor.
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OrderedInstructions(DominatorTree *DT) : DT(DT) {}
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/// Return true if first instruction dominates the second.
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bool dominates(const Instruction *, const Instruction *) const;
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/// Invalidate the OrderedBasicBlock cache when its basic block changes.
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/// i.e. If an instruction is deleted or added to the basic block, the user
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/// should call this function to invalidate the OrderedBasicBlock cache for
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/// this basic block.
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void invalidateBlock(const BasicBlock *BB) { OBBMap.erase(BB); }
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};
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H
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