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4a45626e2f
Summary: Use MemorySSA, if requested, to do less conservative memory dependency checking. This change doesn't enable the MemorySSA enhanced EarlyCSE in the default pipelines, so should be NFC. Reviewers: dberlin, sanjoy, reames, majnemer Subscribers: mcrosier, llvm-commits Differential Revision: http://reviews.llvm.org/D19821 llvm-svn: 280279
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
//===- EarlyCSE.h - Simple and fast CSE pass --------------------*- 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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/// \file
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/// This file provides the interface for a simple, fast CSE pass.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_SCALAR_EARLYCSE_H
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#define LLVM_TRANSFORMS_SCALAR_EARLYCSE_H
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#include "llvm/IR/Function.h"
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#include "llvm/IR/PassManager.h"
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namespace llvm {
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/// \brief A simple and fast domtree-based CSE pass.
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///
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/// This pass does a simple depth-first walk over the dominator tree,
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/// eliminating trivially redundant instructions and using instsimplify to
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/// canonicalize things as it goes. It is intended to be fast and catch obvious
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/// cases so that instcombine and other passes are more effective. It is
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/// expected that a later pass of GVN will catch the interesting/hard cases.
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struct EarlyCSEPass : PassInfoMixin<EarlyCSEPass> {
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EarlyCSEPass(bool UseMemorySSA = false) : UseMemorySSA(UseMemorySSA) {}
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/// \brief Run the pass over the function.
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PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
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bool UseMemorySSA;
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};
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}
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#endif
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