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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
63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
//===-- FuncletLayout.cpp - Contiguously lay out funclets -----------------===//
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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 file implements basic block placement transformations which result in
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// funclets being contiguous.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/Analysis.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/Passes.h"
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#include "llvm/InitializePasses.h"
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using namespace llvm;
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#define DEBUG_TYPE "funclet-layout"
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namespace {
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class FuncletLayout : public MachineFunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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FuncletLayout() : MachineFunctionPass(ID) {
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initializeFuncletLayoutPass(*PassRegistry::getPassRegistry());
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}
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bool runOnMachineFunction(MachineFunction &F) override;
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MachineFunctionProperties getRequiredProperties() const override {
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return MachineFunctionProperties().set(
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MachineFunctionProperties::Property::NoVRegs);
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}
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};
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}
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char FuncletLayout::ID = 0;
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char &llvm::FuncletLayoutID = FuncletLayout::ID;
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INITIALIZE_PASS(FuncletLayout, DEBUG_TYPE,
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"Contiguously Lay Out Funclets", false, false)
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bool FuncletLayout::runOnMachineFunction(MachineFunction &F) {
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// Even though this gets information from getEHScopeMembership(), this pass is
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// only necessary for funclet-based EH personalities, in which these EH scopes
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// are outlined at the end.
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DenseMap<const MachineBasicBlock *, int> FuncletMembership =
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getEHScopeMembership(F);
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if (FuncletMembership.empty())
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return false;
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F.sort([&](MachineBasicBlock &X, MachineBasicBlock &Y) {
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auto FuncletX = FuncletMembership.find(&X);
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auto FuncletY = FuncletMembership.find(&Y);
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assert(FuncletX != FuncletMembership.end());
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assert(FuncletY != FuncletMembership.end());
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return FuncletX->second < FuncletY->second;
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});
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// Conservatively assume we changed something.
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return true;
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}
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