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//===- LastRunTrackingAnalysis.cpp - Avoid running redundant pass -*- 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 is an analysis pass to track a set of passes that have been run, so that
// we can avoid running a pass again if there is no change since the last run of
// the pass.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/LastRunTrackingAnalysis.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
#define DEBUG_TYPE "last-run-tracking"
STATISTIC(NumSkippedPasses, "Number of skipped passes");
STATISTIC(NumLRTQueries, "Number of LastRunTracking queries");
static cl::opt<bool>
DisableLastRunTracking("disable-last-run-tracking", cl::Hidden,
cl::desc("Disable last run tracking"),
cl::init(false));
bool LastRunTrackingInfo::shouldSkipImpl(PassID ID, OptionPtr Ptr) const {
if (DisableLastRunTracking)
return false;
++NumLRTQueries;
auto Iter = TrackedPasses.find(ID);
if (Iter == TrackedPasses.end())
return false;
if (!Iter->second || Iter->second(Ptr)) {
++NumSkippedPasses;
return true;
}
return false;
}
void LastRunTrackingInfo::updateImpl(PassID ID, bool Changed,
CompatibilityCheckFn CheckFn) {
if (Changed)
TrackedPasses.clear();
TrackedPasses[ID] = std::move(CheckFn);
}
AnalysisKey LastRunTrackingAnalysis::Key;
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