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//===- SimplifyCFG.h - Simplify and canonicalize the CFG --------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
/// \file
/// This file provides the interface for the pass responsible for both
/// simplifying and canonicalizing the CFG.
#include "llvm/IR/Function.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Transforms/Utils/Local.h"
namespace llvm {
/// A pass to simplify and canonicalize the CFG of a function.
/// This pass iteratively simplifies the entire CFG of a function. It may change
/// or remove control flow to put the CFG into a canonical form expected by
/// other passes of the mid-level optimizer. Depending on the specified options,
/// it may further optimize control-flow to create non-canonical forms.
class SimplifyCFGPass : public PassInfoMixin<SimplifyCFGPass> {
SimplifyCFGOptions Options;
/// The default constructor sets the pass options to create optimal IR,
/// rather than canonical IR. That is, by default we do transformations that
/// are likely to improve performance but make analysis more difficult.
/// FIXME: This is inverted from what most instantiations of the pass should
/// be.
: SimplifyCFGPass(SimplifyCFGOptions()
.needCanonicalLoops(false)) {}
/// Construct a pass with optional optimizations.
SimplifyCFGPass(const SimplifyCFGOptions &PassOptions);
/// \brief Run the pass over the function.
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);