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68092989f3
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
86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
//===- TailDuplication.cpp - Duplicate blocks into predecessors' tails ----===//
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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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/// \file This pass duplicates basic blocks ending in unconditional branches
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/// into the tails of their predecessors, using the TailDuplicator utility
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/// class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/TailDuplicator.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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using namespace llvm;
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#define DEBUG_TYPE "tailduplication"
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namespace {
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class TailDuplicateBase : public MachineFunctionPass {
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TailDuplicator Duplicator;
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bool PreRegAlloc;
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public:
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TailDuplicateBase(char &PassID, bool PreRegAlloc)
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: MachineFunctionPass(PassID), PreRegAlloc(PreRegAlloc) {}
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bool runOnMachineFunction(MachineFunction &MF) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<MachineBranchProbabilityInfo>();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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};
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class TailDuplicate : public TailDuplicateBase {
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public:
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static char ID;
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TailDuplicate() : TailDuplicateBase(ID, false) {
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initializeTailDuplicatePass(*PassRegistry::getPassRegistry());
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}
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};
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class EarlyTailDuplicate : public TailDuplicateBase {
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public:
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static char ID;
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EarlyTailDuplicate() : TailDuplicateBase(ID, true) {
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initializeEarlyTailDuplicatePass(*PassRegistry::getPassRegistry());
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}
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};
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} // end anonymous namespace
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char TailDuplicate::ID;
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char EarlyTailDuplicate::ID;
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char &llvm::TailDuplicateID = TailDuplicate::ID;
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char &llvm::EarlyTailDuplicateID = EarlyTailDuplicate::ID;
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INITIALIZE_PASS(TailDuplicate, DEBUG_TYPE, "Tail Duplication", false, false)
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INITIALIZE_PASS(EarlyTailDuplicate, "early-tailduplication",
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"Early Tail Duplication", false, false)
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bool TailDuplicateBase::runOnMachineFunction(MachineFunction &MF) {
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if (skipFunction(MF.getFunction()))
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return false;
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auto MBPI = &getAnalysis<MachineBranchProbabilityInfo>();
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Duplicator.initMF(MF, PreRegAlloc, MBPI, /*LayoutMode=*/false);
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bool MadeChange = false;
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while (Duplicator.tailDuplicateBlocks())
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MadeChange = true;
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return MadeChange;
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}
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