55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
|
//===- 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/IR/Module.h"
|
||
|
|
#include "llvm/IR/PassManager.h"
|
||
|
|
|
||
|
|
namespace llvm {
|
||
|
|
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);
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // LLVM_TRANSFORMS_SCALAR_MERGEDLOADSTOREMOTION_H
|