cacbe71af7
This patch adds a new analysis pass to track a set of passes and their parameters to see if we can avoid running transform passes that have just been run. The current implementation only skips redundant InstCombine runs. I will add support for other passes in follow-up patches. RFC link: https://discourse.llvm.org/t/rfc-pipeline-avoid-running-transform-passes-that-have-just-been-run/82467 Compile time improvement: http://llvm-compile-time-tracker.com/compare.php?from=76007138f4ffd4e0f510d12b5e8cad529c21f24d&to=64134cf07ea7eb39c60320087c0c5afdc16c3a2b&stat=instructions%3Au
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
//===- LastRunTrackingAnalysis.cpp - Avoid running redundant pass -*- 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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// This is an analysis pass to track a set of passes that have been run, so that
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// we can avoid running a pass again if there is no change since the last run of
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// the pass.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LastRunTrackingAnalysis.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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#define DEBUG_TYPE "last-run-tracking"
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STATISTIC(NumSkippedPasses, "Number of skipped passes");
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STATISTIC(NumLRTQueries, "Number of LastRunTracking queries");
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static cl::opt<bool>
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DisableLastRunTracking("disable-last-run-tracking", cl::Hidden,
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cl::desc("Disable last run tracking"),
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cl::init(false));
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bool LastRunTrackingInfo::shouldSkipImpl(PassID ID, OptionPtr Ptr) const {
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if (DisableLastRunTracking)
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return false;
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++NumLRTQueries;
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auto Iter = TrackedPasses.find(ID);
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if (Iter == TrackedPasses.end())
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return false;
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if (!Iter->second || Iter->second(Ptr)) {
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++NumSkippedPasses;
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return true;
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}
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return false;
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}
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void LastRunTrackingInfo::updateImpl(PassID ID, bool Changed,
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CompatibilityCheckFn CheckFn) {
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if (Changed)
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TrackedPasses.clear();
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TrackedPasses[ID] = std::move(CheckFn);
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}
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AnalysisKey LastRunTrackingAnalysis::Key;
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