//===- LoopGeneratorsGOMP.h - IR helper to create loops ---------*- 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
//
//===----------------------------------------------------------------------===//
//
// This file contains functions to create scalar and OpenMP parallel loops
// as LLVM-IR.
//
//===----------------------------------------------------------------------===//
#ifndef POLLY_LOOP_GENERATORS_GOMP_H
#define POLLY_LOOP_GENERATORS_GOMP_H
#include "polly/CodeGen/IRBuilder.h"
#include "polly/CodeGen/LoopGenerators.h"
#include "polly/Support/ScopHelper.h"
#include "llvm/ADT/SetVector.h"
namespace polly {
/// This ParallelLoopGenerator subclass handles the generation of parallelized
/// code, utilizing the GNU OpenMP library.
class ParallelLoopGeneratorGOMP final : public ParallelLoopGenerator {
public:
/// Create a parallel loop generator for the current function.
ParallelLoopGeneratorGOMP(PollyIRBuilder &Builder, LoopInfo &LI,
DominatorTree &DT, const DataLayout &DL)
: ParallelLoopGenerator(Builder, LI, DT, DL) {}
// The functions below may be used if one does not want to generate a
// specific OpenMP parallel loop, but generate individual parts of it
// (e.g. the subfunction definition).
/// Create a runtime library call to spawn the worker threads.
///
/// @param SubFn The subfunction which holds the loop body.
/// @param SubFnParam The parameter for the subfunction (basically the struct
/// filled with the outside values).
/// @param LB The lower bound for the loop we parallelize.
/// @param UB The upper bound for the loop we parallelize.
/// @param Stride The stride of the loop we parallelize.
void createCallSpawnThreads(Value *SubFn, Value *SubFnParam, Value *LB,
Value *UB, Value *Stride);
void deployParallelExecution(Function *SubFn, Value *SubFnParam, Value *LB,
Value *UB, Value *Stride) override;
Function *prepareSubFnDefinition(Function *F) const override;
std::tuple<Value *, Function *> createSubFn(Value *Stride, AllocaInst *Struct,
SetVector<Value *> UsedValues,
ValueMapT &VMap) override;
/// Create a runtime library call to join the worker threads.
void createCallJoinThreads();
/// Create a runtime library call to get the next work item.
///
/// @param LBPtr A pointer value to store the work item begin in.
/// @param UBPtr A pointer value to store the work item end in.
///
/// @returns A true value if the work item is not empty.
Value *createCallGetWorkItem(Value *LBPtr, Value *UBPtr);
/// Create a runtime library call to allow cleanup of the thread.
///
/// @note This function is called right before the thread will exit the
/// subfunction and only if the runtime system depends on it.
void createCallCleanupThread();
};
} // end namespace polly
#endif