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//===- IPO/OpenMPOpt.h - Collection of OpenMP optimizations -----*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_IPO_OPENMP_OPT_H
#define LLVM_TRANSFORMS_IPO_OPENMP_OPT_H
#include "llvm/Analysis/CGSCCPassManager.h"
#include "llvm/Analysis/LazyCallGraph.h"
#include "llvm/IR/PassManager.h"
namespace llvm {
namespace omp {
/// Summary of a kernel (=entry point for target offloading).
using Kernel = Function *;
/// Helper to remember if the module contains OpenMP (runtime calls), to be used
/// foremost with containsOpenMP.
struct OpenMPInModule {
OpenMPInModule &operator=(bool Found) {
if (Found)
Value = OpenMPInModule::OpenMP::FOUND;
else
Value = OpenMPInModule::OpenMP::NOT_FOUND;
return *this;
}
bool isKnown() { return Value != OpenMP::UNKNOWN; }
operator bool() { return Value != OpenMP::NOT_FOUND; }
/// Does this function \p F contain any OpenMP runtime calls?
bool containsOMPRuntimeCalls(Function *F) const {
return FuncsWithOMPRuntimeCalls.contains(F);
}
/// Return the known kernels (=GPU entry points) in the module.
SmallPtrSetImpl<Kernel> &getKernels() { return Kernels; }
/// Identify kernels in the module and populate the Kernels set.
void identifyKernels(Module &M);
private:
enum class OpenMP { FOUND, NOT_FOUND, UNKNOWN } Value = OpenMP::UNKNOWN;
friend bool containsOpenMP(Module &M, OpenMPInModule &OMPInModule);
/// In which functions are OpenMP runtime calls present?
SmallPtrSet<Function *, 32> FuncsWithOMPRuntimeCalls;
/// Collection of known kernels (=GPU entry points) in the module.
SmallPtrSet<Kernel, 8> Kernels;
};
/// Helper to determine if \p M contains OpenMP (runtime calls).
bool containsOpenMP(Module &M, OpenMPInModule &OMPInModule);
} // namespace omp
/// OpenMP optimizations pass.
class OpenMPOptPass : public PassInfoMixin<OpenMPOptPass> {
/// Helper to remember if the module contains OpenMP (runtime calls).
omp::OpenMPInModule OMPInModule;
public:
PreservedAnalyses run(LazyCallGraph::SCC &C, CGSCCAnalysisManager &AM,
LazyCallGraph &CG, CGSCCUpdateResult &UR);
};
} // end namespace llvm
#endif // LLVM_TRANSFORMS_IPO_OPENMP_OPT_H
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