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This file lists every pass in LLVM, and is included by Pass.h, which is very popular. Every time we add, remove, or rename a pass in LLVM, it caused lots of recompilation. I found this fact by looking at this table, which is sorted by the number of times a file was changed over the last 100,000 git commits multiplied by the number of object files that depend on it in the current checkout: recompiles touches affected_files header 342380 95 3604 llvm/include/llvm/ADT/STLExtras.h 314730 234 1345 llvm/include/llvm/InitializePasses.h 307036 118 2602 llvm/include/llvm/ADT/APInt.h 213049 59 3611 llvm/include/llvm/Support/MathExtras.h 170422 47 3626 llvm/include/llvm/Support/Compiler.h 162225 45 3605 llvm/include/llvm/ADT/Optional.h 158319 63 2513 llvm/include/llvm/ADT/Triple.h 140322 39 3598 llvm/include/llvm/ADT/StringRef.h 137647 59 2333 llvm/include/llvm/Support/Error.h 131619 73 1803 llvm/include/llvm/Support/FileSystem.h Before this change, touching InitializePasses.h would cause 1345 files to recompile. After this change, touching it only causes 550 compiles in an incremental rebuild. Reviewers: bkramer, asbirlea, bollu, jdoerfert Differential Revision: https://reviews.llvm.org/D70211
98 lines
3.4 KiB
C++
98 lines
3.4 KiB
C++
///===- LazyMachineBlockFrequencyInfo.cpp - Lazy Machine Block Frequency --===//
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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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/// \file
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/// This is an alternative analysis pass to MachineBlockFrequencyInfo. The
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/// difference is that with this pass the block frequencies are not computed
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/// when the analysis pass is executed but rather when the BFI result is
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/// explicitly requested by the analysis client.
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///
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///===---------------------------------------------------------------------===//
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#include "llvm/CodeGen/LazyMachineBlockFrequencyInfo.h"
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#include "llvm/InitializePasses.h"
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using namespace llvm;
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#define DEBUG_TYPE "lazy-machine-block-freq"
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INITIALIZE_PASS_BEGIN(LazyMachineBlockFrequencyInfoPass, DEBUG_TYPE,
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"Lazy Machine Block Frequency Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
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INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
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INITIALIZE_PASS_END(LazyMachineBlockFrequencyInfoPass, DEBUG_TYPE,
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"Lazy Machine Block Frequency Analysis", true, true)
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char LazyMachineBlockFrequencyInfoPass::ID = 0;
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LazyMachineBlockFrequencyInfoPass::LazyMachineBlockFrequencyInfoPass()
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: MachineFunctionPass(ID) {
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initializeLazyMachineBlockFrequencyInfoPassPass(
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*PassRegistry::getPassRegistry());
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}
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void LazyMachineBlockFrequencyInfoPass::print(raw_ostream &OS,
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const Module *M) const {
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getBFI().print(OS, M);
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}
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void LazyMachineBlockFrequencyInfoPass::getAnalysisUsage(
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AnalysisUsage &AU) const {
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AU.addRequired<MachineBranchProbabilityInfo>();
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AU.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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void LazyMachineBlockFrequencyInfoPass::releaseMemory() {
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OwnedMBFI.reset();
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OwnedMLI.reset();
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OwnedMDT.reset();
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}
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MachineBlockFrequencyInfo &
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LazyMachineBlockFrequencyInfoPass::calculateIfNotAvailable() const {
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auto *MBFI = getAnalysisIfAvailable<MachineBlockFrequencyInfo>();
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if (MBFI) {
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LLVM_DEBUG(dbgs() << "MachineBlockFrequencyInfo is available\n");
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return *MBFI;
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}
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auto &MBPI = getAnalysis<MachineBranchProbabilityInfo>();
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auto *MLI = getAnalysisIfAvailable<MachineLoopInfo>();
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auto *MDT = getAnalysisIfAvailable<MachineDominatorTree>();
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LLVM_DEBUG(dbgs() << "Building MachineBlockFrequencyInfo on the fly\n");
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LLVM_DEBUG(if (MLI) dbgs() << "LoopInfo is available\n");
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if (!MLI) {
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LLVM_DEBUG(dbgs() << "Building LoopInfo on the fly\n");
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// First create a dominator tree.
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LLVM_DEBUG(if (MDT) dbgs() << "DominatorTree is available\n");
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if (!MDT) {
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LLVM_DEBUG(dbgs() << "Building DominatorTree on the fly\n");
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OwnedMDT = std::make_unique<MachineDominatorTree>();
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OwnedMDT->getBase().recalculate(*MF);
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MDT = OwnedMDT.get();
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}
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// Generate LoopInfo from it.
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OwnedMLI = std::make_unique<MachineLoopInfo>();
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OwnedMLI->getBase().analyze(MDT->getBase());
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MLI = OwnedMLI.get();
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}
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OwnedMBFI = std::make_unique<MachineBlockFrequencyInfo>();
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OwnedMBFI->calculate(*MF, MBPI, *MLI);
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return *OwnedMBFI.get();
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}
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bool LazyMachineBlockFrequencyInfoPass::runOnMachineFunction(
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MachineFunction &F) {
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MF = &F;
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return false;
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}
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