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11e71061b1
Besides a general consistently benefit, the extra layer of indirection allows the mechanical part of https://reviews.llvm.org/D23256 that requires touching every transformation and analysis to be factored out cleanly. Thanks to David for the suggestion. llvm-svn: 278077
40 lines
1.5 KiB
C++
40 lines
1.5 KiB
C++
//===- MergedLoadStoreMotion.h - merge and hoist/sink load/stores ---------===//
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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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//! \file
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//! \brief This pass performs merges of loads and stores on both sides of a
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// diamond (hammock). It hoists the loads and sinks the stores.
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//
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// The algorithm iteratively hoists two loads to the same address out of a
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// diamond (hammock) and merges them into a single load in the header. Similar
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// it sinks and merges two stores to the tail block (footer). The algorithm
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// iterates over the instructions of one side of the diamond and attempts to
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// find a matching load/store on the other side. It hoists / sinks when it
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// thinks it safe to do so. This optimization helps with eg. hiding load
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// latencies, triggering if-conversion, and reducing static code size.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
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#define LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
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#include "llvm/IR/Module.h"
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#include "llvm/IR/PassManager.h"
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namespace llvm {
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class MergedLoadStoreMotionPass
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: public PassInfoMixin<MergedLoadStoreMotionPass> {
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public:
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PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
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};
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}
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#endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
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