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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
//===------ FlattenSchedule.cpp --------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Try to reduce the number of scatter dimension. Useful to make isl_union_map
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// schedules more understandable. This is only intended for debugging and
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// unittests, not for production use.
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//
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//===----------------------------------------------------------------------===//
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#include "polly/FlattenSchedule.h"
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#include "polly/FlattenAlgo.h"
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#include "polly/ScopInfo.h"
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#include "polly/ScopPass.h"
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#include "polly/Support/ISLOStream.h"
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#include "polly/Support/ISLTools.h"
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#define DEBUG_TYPE "polly-flatten-schedule"
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using namespace polly;
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using namespace llvm;
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namespace {
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/// Print a schedule to @p OS.
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///
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/// Prints the schedule for each statements on a new line.
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void printSchedule(raw_ostream &OS, const isl::union_map &Schedule,
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int indent) {
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for (isl::map Map : Schedule.get_map_list())
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OS.indent(indent) << Map << "\n";
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}
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/// Flatten the schedule stored in an polly::Scop.
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class FlattenSchedule : public ScopPass {
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private:
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FlattenSchedule(const FlattenSchedule &) = delete;
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const FlattenSchedule &operator=(const FlattenSchedule &) = delete;
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std::shared_ptr<isl_ctx> IslCtx;
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isl::union_map OldSchedule;
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public:
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static char ID;
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explicit FlattenSchedule() : ScopPass(ID) {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequiredTransitive<ScopInfoRegionPass>();
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AU.setPreservesAll();
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}
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virtual bool runOnScop(Scop &S) override {
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// Keep a reference to isl_ctx to ensure that it is not freed before we free
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// OldSchedule.
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IslCtx = S.getSharedIslCtx();
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LLVM_DEBUG(dbgs() << "Going to flatten old schedule:\n");
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OldSchedule = S.getSchedule();
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LLVM_DEBUG(printSchedule(dbgs(), OldSchedule, 2));
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auto Domains = S.getDomains();
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auto RestrictedOldSchedule = OldSchedule.intersect_domain(Domains);
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LLVM_DEBUG(dbgs() << "Old schedule with domains:\n");
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LLVM_DEBUG(printSchedule(dbgs(), RestrictedOldSchedule, 2));
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auto NewSchedule = flattenSchedule(RestrictedOldSchedule);
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LLVM_DEBUG(dbgs() << "Flattened new schedule:\n");
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LLVM_DEBUG(printSchedule(dbgs(), NewSchedule, 2));
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NewSchedule = NewSchedule.gist_domain(Domains);
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LLVM_DEBUG(dbgs() << "Gisted, flattened new schedule:\n");
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LLVM_DEBUG(printSchedule(dbgs(), NewSchedule, 2));
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S.setSchedule(NewSchedule);
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return false;
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}
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virtual void printScop(raw_ostream &OS, Scop &S) const override {
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OS << "Schedule before flattening {\n";
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printSchedule(OS, OldSchedule, 4);
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OS << "}\n\n";
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OS << "Schedule after flattening {\n";
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printSchedule(OS, S.getSchedule(), 4);
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OS << "}\n";
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}
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virtual void releaseMemory() override {
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OldSchedule = nullptr;
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IslCtx.reset();
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}
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};
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char FlattenSchedule::ID;
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} // anonymous namespace
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Pass *polly::createFlattenSchedulePass() { return new FlattenSchedule(); }
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INITIALIZE_PASS_BEGIN(FlattenSchedule, "polly-flatten-schedule",
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"Polly - Flatten schedule", false, false)
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INITIALIZE_PASS_END(FlattenSchedule, "polly-flatten-schedule",
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"Polly - Flatten schedule", false, false)
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