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//===------ FlattenSchedule.cpp --------------------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// Try to reduce the number of scatter dimension. Useful to make isl_union_map
// schedules more understandable. This is only intended for debugging and
// unittests, not for production use.
//
//===----------------------------------------------------------------------===//
#include "polly/FlattenSchedule.h"
#include "polly/FlattenAlgo.h"
#include "polly/Options.h"
#include "polly/ScopInfo.h"
#include "polly/Support/ISLOStream.h"
#include "polly/Support/ISLTools.h"
#include "polly/Support/PollyDebug.h"
#define DEBUG_TYPE "polly-flatten-schedule"
using namespace polly;
using namespace llvm;
namespace {
static cl::opt<bool> PollyPrintFlattenSchedule("polly-print-flatten-schedule",
cl::desc("A polly pass"),
cl::cat(PollyCategory));
/// Print a schedule to @p OS.
///
/// Prints the schedule for each statements on a new line.
void printSchedule(raw_ostream &OS, const isl::union_map &Schedule,
int indent) {
for (isl::map Map : Schedule.get_map_list())
OS.indent(indent) << Map << "\n";
}
} // namespace
void polly::runFlattenSchedulePass(Scop &S) {
// Keep a reference to isl_ctx to ensure that it is not freed before we free
// OldSchedule.
auto IslCtx = S.getSharedIslCtx();
POLLY_DEBUG(dbgs() << "Going to flatten old schedule:\n");
auto OldSchedule = S.getSchedule();
POLLY_DEBUG(printSchedule(dbgs(), OldSchedule, 2));
auto Domains = S.getDomains();
auto RestrictedOldSchedule = OldSchedule.intersect_domain(Domains);
POLLY_DEBUG(dbgs() << "Old schedule with domains:\n");
POLLY_DEBUG(printSchedule(dbgs(), RestrictedOldSchedule, 2));
auto NewSchedule = flattenSchedule(RestrictedOldSchedule);
POLLY_DEBUG(dbgs() << "Flattened new schedule:\n");
POLLY_DEBUG(printSchedule(dbgs(), NewSchedule, 2));
NewSchedule = NewSchedule.gist_domain(Domains);
POLLY_DEBUG(dbgs() << "Gisted, flattened new schedule:\n");
POLLY_DEBUG(printSchedule(dbgs(), NewSchedule, 2));
S.setSchedule(NewSchedule);
if (PollyPrintFlattenSchedule) {
outs()
<< "Printing analysis 'Polly - Print flattened schedule' for region: '"
<< S.getRegion().getNameStr() << "' in function '"
<< S.getFunction().getName() << "':\n";
outs() << "Schedule before flattening {\n";
printSchedule(outs(), OldSchedule, 4);
outs() << "}\n\n";
outs() << "Schedule after flattening {\n";
printSchedule(outs(), S.getSchedule(), 4);
outs() << "}\n";
}
}
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