| //===- SimplifyCFG.h - Simplify and canonicalize the CFG --------*- 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 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/Transforms/Utils/Local.h" |
| #include "llvm/IR/Function.h" |
| #include "llvm/IR/PassManager.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) |
| .sinkCommonInsts(false)) {} |
| |
| |
| /// Construct a pass with optional optimizations. |
| SimplifyCFGPass(const SimplifyCFGOptions &PassOptions); |
| |
| /// Run the pass over the function. |
| PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); |
| }; |
| |
| } |
| |
| #endif |