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//===- MergedLoadStoreMotion.h - merge and hoist/sink load/stores ---------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
//! \file
//! This pass performs merges of loads and stores on both sides of a
// diamond (hammock). It hoists the loads and sinks the stores.
//
// The algorithm iteratively hoists two loads to the same address out of a
// diamond (hammock) and merges them into a single load in the header. Similar
// it sinks and merges two stores to the tail block (footer). The algorithm
// iterates over the instructions of one side of the diamond and attempts to
// find a matching load/store on the other side. It hoists / sinks when it
// thinks it safe to do so. This optimization helps with eg. hiding load
// latencies, triggering if-conversion, and reducing static code size.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
#define LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
#include "llvm/ADT/STLFunctionalExtras.h"
#include "llvm/IR/PassManager.h"
namespace llvm {
class Function;
struct MergedLoadStoreMotionOptions {
bool SplitFooterBB;
MergedLoadStoreMotionOptions(bool SplitFooterBB = false)
: SplitFooterBB(SplitFooterBB) {}
MergedLoadStoreMotionOptions &splitFooterBB(bool SFBB) {
SplitFooterBB = SFBB;
return *this;
}
};
class MergedLoadStoreMotionPass
: public PassInfoMixin<MergedLoadStoreMotionPass> {
MergedLoadStoreMotionOptions Options;
public:
MergedLoadStoreMotionPass()
: MergedLoadStoreMotionPass(MergedLoadStoreMotionOptions()) {}
MergedLoadStoreMotionPass(const MergedLoadStoreMotionOptions &PassOptions)
: Options(PassOptions) {}
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
void printPipeline(raw_ostream &OS,
function_ref<StringRef(StringRef)> MapClassName2PassName);
};
}
#endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
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