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//===- SCCP.cpp - Sparse Conditional Constant Propagation -------*- C++ -*-===//
//
// 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 file implements sparse conditional constant propagation and merging:
//
// Specifically, this:
// * Assumes values are constant unless proven otherwise
// * Assumes BasicBlocks are dead unless proven otherwise
// * Proves values to be constant, and replaces them with constants
// * Proves conditional branches to be unconditional
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_SCALAR_SCCP_H
#define LLVM_TRANSFORMS_SCALAR_SCCP_H
#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Transforms/Utils/PredicateInfo.h"
namespace llvm {
class PostDominatorTree;
/// This pass performs function-level constant propagation and merging.
class SCCPPass : public PassInfoMixin<SCCPPass> {
public:
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
};
/// Helper struct for bundling up the analysis results per function for IPSCCP.
struct AnalysisResultsForFn {
std::unique_ptr<PredicateInfo> PredInfo;
DominatorTree *DT;
PostDominatorTree *PDT;
};
bool runIPSCCP(Module &M, const DataLayout &DL, const TargetLibraryInfo *TLI,
function_ref<AnalysisResultsForFn(Function &)> getAnalysis);
} // end namespace llvm
#endif // LLVM_TRANSFORMS_SCALAR_SCCP_H
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