55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
//===- 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.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TRANSFORMS_SCALAR_SIMPLIFYCFG_H
|
|
#define LLVM_TRANSFORMS_SCALAR_SIMPLIFYCFG_H
|
|
|
|
#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;
|
|
|
|
public:
|
|
/// The default constructor sets the pass options to create canonical IR,
|
|
/// rather than optimal IR. That is, by default we bypass transformations that
|
|
/// are likely to improve performance but make analysis for other passes more
|
|
/// difficult.
|
|
SimplifyCFGPass()
|
|
: SimplifyCFGPass(SimplifyCFGOptions()
|
|
.forwardSwitchCondToPhi(false)
|
|
.convertSwitchToLookupTable(false)
|
|
.needCanonicalLoops(true)) {}
|
|
|
|
|
|
/// Construct a pass with optional optimizations.
|
|
SimplifyCFGPass(const SimplifyCFGOptions &PassOptions);
|
|
|
|
/// \brief Run the pass over the function.
|
|
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|