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Reid Kleckner
05da2fe521
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
73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
//===- LazyBlockFrequencyInfo.cpp - Lazy Block Frequency Analysis ---------===//
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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 alternative analysis pass to BlockFrequencyInfoWrapperPass. The
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// difference is that with this pass the block frequencies are not computed when
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// the analysis pass is executed but rather when the BFI result is explicitly
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// requested by the analysis client.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LazyBlockFrequencyInfo.h"
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#include "llvm/Analysis/LazyBranchProbabilityInfo.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/InitializePasses.h"
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using namespace llvm;
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#define DEBUG_TYPE "lazy-block-freq"
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INITIALIZE_PASS_BEGIN(LazyBlockFrequencyInfoPass, DEBUG_TYPE,
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"Lazy Block Frequency Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(LazyBPIPass)
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
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INITIALIZE_PASS_END(LazyBlockFrequencyInfoPass, DEBUG_TYPE,
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"Lazy Block Frequency Analysis", true, true)
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char LazyBlockFrequencyInfoPass::ID = 0;
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LazyBlockFrequencyInfoPass::LazyBlockFrequencyInfoPass() : FunctionPass(ID) {
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initializeLazyBlockFrequencyInfoPassPass(*PassRegistry::getPassRegistry());
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}
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void LazyBlockFrequencyInfoPass::print(raw_ostream &OS, const Module *) const {
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LBFI.getCalculated().print(OS);
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}
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void LazyBlockFrequencyInfoPass::getAnalysisUsage(AnalysisUsage &AU) const {
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LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(AU);
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// We require DT so it's available when LI is available. The LI updating code
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// asserts that DT is also present so if we don't make sure that we have DT
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// here, that assert will trigger.
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AU.addRequired<DominatorTreeWrapperPass>();
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AU.addRequired<LoopInfoWrapperPass>();
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AU.setPreservesAll();
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}
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void LazyBlockFrequencyInfoPass::releaseMemory() { LBFI.releaseMemory(); }
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bool LazyBlockFrequencyInfoPass::runOnFunction(Function &F) {
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auto &BPIPass = getAnalysis<LazyBranchProbabilityInfoPass>();
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LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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LBFI.setAnalysis(&F, &BPIPass, &LI);
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return false;
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}
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void LazyBlockFrequencyInfoPass::getLazyBFIAnalysisUsage(AnalysisUsage &AU) {
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LazyBranchProbabilityInfoPass::getLazyBPIAnalysisUsage(AU);
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AU.addRequired<LazyBlockFrequencyInfoPass>();
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AU.addRequired<LoopInfoWrapperPass>();
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}
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void llvm::initializeLazyBFIPassPass(PassRegistry &Registry) {
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initializeLazyBPIPassPass(Registry);
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INITIALIZE_PASS_DEPENDENCY(LazyBlockFrequencyInfoPass);
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass);
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}
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