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//===- PruneUnprofitable.cpp ----------------------------------------------===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Mark a SCoP as unfeasible if not deemed profitable to optimize.
#include "polly/PruneUnprofitable.h"
#include "polly/ScopDetection.h"
#include "polly/ScopInfo.h"
#include "polly/ScopPass.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace polly;
#define DEBUG_TYPE "polly-prune-unprofitable"
namespace {
"Number of SCoPs considered for unprofitability pruning");
STATISTIC(ScopsPruned, "Number of pruned SCoPs because it they cannot be "
"optimized in a significant way");
STATISTIC(ScopsSurvived, "Number of SCoPs after pruning");
STATISTIC(NumPrunedLoops, "Number of pruned loops");
STATISTIC(NumPrunedBoxedLoops, "Number of pruned boxed loops");
STATISTIC(NumPrunedAffineLoops, "Number of pruned affine loops");
STATISTIC(NumLoopsInScop, "Number of loops in scops after pruning");
STATISTIC(NumBoxedLoops, "Number of boxed loops in SCoPs after pruning");
STATISTIC(NumAffineLoops, "Number of affine loops in SCoPs after pruning");
class PruneUnprofitable : public ScopPass {
void updateStatistics(Scop &S, bool Pruned) {
auto ScopStats = S.getStatistics();
if (Pruned) {
NumPrunedLoops += ScopStats.NumAffineLoops + ScopStats.NumBoxedLoops;
NumPrunedBoxedLoops += ScopStats.NumBoxedLoops;
NumPrunedAffineLoops += ScopStats.NumAffineLoops;
} else {
NumLoopsInScop += ScopStats.NumAffineLoops + ScopStats.NumBoxedLoops;
NumBoxedLoops += ScopStats.NumBoxedLoops;
NumAffineLoops += ScopStats.NumAffineLoops;
static char ID;
explicit PruneUnprofitable() : ScopPass(ID) {}
PruneUnprofitable(const PruneUnprofitable &) = delete;
PruneUnprofitable &operator=(const PruneUnprofitable &) = delete;
void getAnalysisUsage(AnalysisUsage &AU) const override {
bool runOnScop(Scop &S) override {
if (PollyProcessUnprofitable) {
dbgs() << "NOTE: -polly-process-unprofitable active, won't prune "
return false;
if (!S.isProfitable(true)) {
dbgs() << "SCoP pruned because it probably cannot be optimized in "
"a significant way\n");
S.invalidate(PROFITABLE, DebugLoc());
updateStatistics(S, true);
} else {
updateStatistics(S, false);
return false;
} // namespace
char PruneUnprofitable::ID;
Pass *polly::createPruneUnprofitablePass() { return new PruneUnprofitable(); }
INITIALIZE_PASS_BEGIN(PruneUnprofitable, "polly-prune-unprofitable",
"Polly - Prune unprofitable SCoPs", false, false)
INITIALIZE_PASS_END(PruneUnprofitable, "polly-prune-unprofitable",
"Polly - Prune unprofitable SCoPs", false, false)