forked from OSchip/llvm-project
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
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//===- PruneUnprofitable.cpp ------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Mark a SCoP as unfeasible if not deemed profitable to optimize.
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//
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//===----------------------------------------------------------------------===//
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#include "polly/PruneUnprofitable.h"
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#include "polly/ScopInfo.h"
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#include "polly/ScopPass.h"
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#define DEBUG_TYPE "polly-prune-unprofitable"
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using namespace polly;
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using namespace llvm;
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namespace {
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STATISTIC(ScopsProcessed,
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"Number of SCoPs considered for unprofitability pruning");
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STATISTIC(ScopsPruned, "Number of pruned SCoPs because it they cannot be "
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"optimized in a significant way");
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class PruneUnprofitable : public ScopPass {
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private:
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PruneUnprofitable(const PruneUnprofitable &) = delete;
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const PruneUnprofitable &operator=(const PruneUnprofitable &) = delete;
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public:
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static char ID;
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explicit PruneUnprofitable() : ScopPass(ID) {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<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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if (PollyProcessUnprofitable) {
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DEBUG(dbgs() << "NOTE: -polly-process-unprofitable active, won't prune "
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"anything\n");
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return false;
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}
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ScopsProcessed++;
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if (!S.isProfitable(true)) {
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DEBUG(dbgs() << "SCoP pruned because it probably cannot be optimized in "
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"a significant way\n");
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ScopsPruned++;
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S.invalidate(PROFITABLE, DebugLoc());
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}
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return false;
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}
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};
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char PruneUnprofitable::ID;
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} // anonymous namespace
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Pass *polly::createPruneUnprofitablePass() { return new PruneUnprofitable(); }
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INITIALIZE_PASS_BEGIN(PruneUnprofitable, "polly-prune-unprofitable",
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"Polly - Prune unprofitable SCoPs", false, false)
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INITIALIZE_PASS_END(PruneUnprofitable, "polly-prune-unprofitable",
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"Polly - Prune unprofitable SCoPs", false, false)
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