2009-06-02 17:52:33 +00:00
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//===- LoopPass.cpp - Loop Pass and Loop Pass Manager ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements LoopPass and LPPassManager. All loop optimization
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// and transformation passes are derived from LoopPass. LPPassManager is
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// responsible for managing LoopPasses.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/LoopPass.h"
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2017-01-14 15:37:50 +00:00
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#include "llvm/Analysis/LoopAnalysisManager.h"
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2017-01-02 19:17:04 +00:00
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#include "llvm/IR/Dominators.h"
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2014-11-24 09:08:18 +00:00
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#include "llvm/IR/IRPrintingPasses.h"
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#include "llvm/IR/LLVMContext.h"
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2016-07-23 20:41:05 +00:00
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#include "llvm/IR/OptBisect.h"
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2015-12-30 11:46:15 +00:00
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#include "llvm/IR/PassManager.h"
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2010-04-03 07:51:10 +00:00
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#include "llvm/Support/Debug.h"
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2010-04-02 08:54:30 +00:00
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#include "llvm/Support/Timer.h"
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2015-05-27 18:44:32 +00:00
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#include "llvm/Support/raw_ostream.h"
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2009-06-02 17:52:33 +00:00
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using namespace llvm;
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2014-11-24 09:08:18 +00:00
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#define DEBUG_TYPE "loop-pass-manager"
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2010-04-03 07:51:10 +00:00
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namespace {
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/// PrintLoopPass - Print a Function corresponding to a Loop.
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///
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2015-12-30 11:46:15 +00:00
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class PrintLoopPassWrapper : public LoopPass {
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2017-01-14 15:37:50 +00:00
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raw_ostream &OS;
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std::string Banner;
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2010-04-03 07:51:10 +00:00
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public:
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static char ID;
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2017-01-14 15:37:50 +00:00
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PrintLoopPassWrapper() : LoopPass(ID), OS(dbgs()) {}
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2015-12-30 11:46:15 +00:00
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PrintLoopPassWrapper(raw_ostream &OS, const std::string &Banner)
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2017-01-14 15:37:50 +00:00
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: LoopPass(ID), OS(OS), Banner(Banner) {}
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2010-04-03 07:51:10 +00:00
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2014-11-24 09:08:18 +00:00
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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2010-04-03 07:51:10 +00:00
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AU.setPreservesAll();
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}
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2014-11-24 09:08:18 +00:00
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bool runOnLoop(Loop *L, LPPassManager &) override {
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2016-01-13 19:58:01 +00:00
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auto BBI = find_if(L->blocks().begin(), L->blocks().end(),
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[](BasicBlock *BB) { return BB; });
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if (BBI != L->blocks().end() &&
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2016-07-23 20:41:05 +00:00
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isFunctionInPrintList((*BBI)->getParent()->getName())) {
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2017-01-14 15:37:50 +00:00
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printLoop(*L, OS, Banner);
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2016-07-23 20:41:05 +00:00
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}
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2010-04-03 07:51:10 +00:00
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return false;
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}
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2017-04-16 16:01:22 +00:00
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StringRef getPassName() const override { return "Print Loop IR"; }
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2010-04-03 07:51:10 +00:00
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};
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2015-12-30 11:46:15 +00:00
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char PrintLoopPassWrapper::ID = 0;
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2015-07-05 14:21:36 +00:00
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}
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2010-04-03 07:51:10 +00:00
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2009-06-02 17:52:33 +00:00
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//===----------------------------------------------------------------------===//
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// LPPassManager
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//
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char LPPassManager::ID = 0;
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2011-10-20 21:10:27 +00:00
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LPPassManager::LPPassManager()
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: FunctionPass(ID), PMDataManager() {
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2014-11-24 09:08:18 +00:00
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LI = nullptr;
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CurrentLoop = nullptr;
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2009-06-02 17:52:33 +00:00
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}
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2017-05-29 16:25:25 +00:00
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// Insert loop into loop nest (LoopInfo) and loop queue (LQ).
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void LPPassManager::addLoop(Loop &L) {
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if (!L.getParentLoop()) {
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2015-12-30 11:46:15 +00:00
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// This is the top level loop.
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2017-05-29 16:25:25 +00:00
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LQ.push_front(&L);
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return;
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2009-06-02 17:52:33 +00:00
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}
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2015-12-30 11:46:15 +00:00
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// Insert L into the loop queue after the parent loop.
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for (auto I = LQ.begin(), E = LQ.end(); I != E; ++I) {
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2017-05-29 16:25:25 +00:00
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if (*I == L.getParentLoop()) {
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2015-12-30 11:46:15 +00:00
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// deque does not support insert after.
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++I;
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2017-05-29 16:25:25 +00:00
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LQ.insert(I, 1, &L);
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return;
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2015-12-30 11:46:15 +00:00
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}
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}
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2009-06-02 17:52:33 +00:00
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}
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/// cloneBasicBlockSimpleAnalysis - Invoke cloneBasicBlockAnalysis hook for
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/// all loop passes.
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2011-10-20 21:10:27 +00:00
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void LPPassManager::cloneBasicBlockSimpleAnalysis(BasicBlock *From,
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2009-06-02 17:52:33 +00:00
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BasicBlock *To, Loop *L) {
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2011-10-20 21:10:27 +00:00
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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2010-09-17 15:48:55 +00:00
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LoopPass *LP = getContainedPass(Index);
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2009-06-02 17:52:33 +00:00
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LP->cloneBasicBlockAnalysis(From, To, L);
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}
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}
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/// deleteSimpleAnalysisValue - Invoke deleteAnalysisValue hook for all passes.
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void LPPassManager::deleteSimpleAnalysisValue(Value *V, Loop *L) {
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if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) {
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2016-07-23 20:41:05 +00:00
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for (Instruction &I : *BB) {
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2009-06-02 17:52:33 +00:00
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deleteSimpleAnalysisValue(&I, L);
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}
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}
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2011-10-20 21:10:27 +00:00
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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2010-09-17 15:48:55 +00:00
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LoopPass *LP = getContainedPass(Index);
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2009-06-02 17:52:33 +00:00
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LP->deleteAnalysisValue(V, L);
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}
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}
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2015-01-18 16:17:27 +00:00
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/// Invoke deleteAnalysisLoop hook for all passes.
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void LPPassManager::deleteSimpleAnalysisLoop(Loop *L) {
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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LoopPass *LP = getContainedPass(Index);
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LP->deleteAnalysisLoop(L);
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}
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}
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2009-06-02 17:52:33 +00:00
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// Recurse through all subloops and all loops into LQ.
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static void addLoopIntoQueue(Loop *L, std::deque<Loop *> &LQ) {
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LQ.push_back(L);
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2017-01-02 19:17:04 +00:00
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for (Loop *I : reverse(*L))
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addLoopIntoQueue(I, LQ);
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2009-06-02 17:52:33 +00:00
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}
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/// Pass Manager itself does not invalidate any analysis info.
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void LPPassManager::getAnalysisUsage(AnalysisUsage &Info) const {
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2011-10-20 21:10:27 +00:00
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// LPPassManager needs LoopInfo. In the long term LoopInfo class will
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2009-06-02 17:52:33 +00:00
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// become part of LPPassManager.
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2015-05-27 18:44:32 +00:00
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Info.addRequired<LoopInfoWrapperPass>();
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2017-01-02 19:17:04 +00:00
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Info.addRequired<DominatorTreeWrapperPass>();
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2009-06-02 17:52:33 +00:00
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Info.setPreservesAll();
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}
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/// run - Execute all of the passes scheduled for execution. Keep track of
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/// whether any of the passes modifies the function, and if so, return true.
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bool LPPassManager::runOnFunction(Function &F) {
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2015-05-27 18:44:32 +00:00
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auto &LIWP = getAnalysis<LoopInfoWrapperPass>();
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LI = &LIWP.getLoopInfo();
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2017-01-02 19:17:04 +00:00
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DominatorTree *DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
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2009-06-02 17:52:33 +00:00
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bool Changed = false;
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// Collect inherited analysis from Module level pass manager.
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populateInheritedAnalysis(TPM->activeStack);
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2012-08-15 19:34:23 +00:00
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// Populate the loop queue in reverse program order. There is no clear need to
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// process sibling loops in either forward or reverse order. There may be some
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// advantage in deleting uses in a later loop before optimizing the
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// definitions in an earlier loop. If we find a clear reason to process in
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// forward order, then a forward variant of LoopPassManager should be created.
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2013-12-22 00:04:03 +00:00
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//
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// Note that LoopInfo::iterator visits loops in reverse program
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// order. Here, reverse_iterator gives us a forward order, and the LoopQueue
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// reverses the order a third time by popping from the back.
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2017-01-02 19:17:04 +00:00
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for (Loop *L : reverse(*LI))
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addLoopIntoQueue(L, LQ);
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2009-06-02 17:52:33 +00:00
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2009-07-04 13:58:26 +00:00
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if (LQ.empty()) // No loops, skip calling finalizers
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return false;
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2009-06-02 17:52:33 +00:00
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// Initialization
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2017-01-02 19:17:04 +00:00
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for (Loop *L : LQ) {
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2011-10-20 21:10:27 +00:00
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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2010-09-17 15:48:55 +00:00
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LoopPass *P = getContainedPass(Index);
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2010-01-23 11:09:33 +00:00
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Changed |= P->doInitialization(L, *this);
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2009-06-02 17:52:33 +00:00
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}
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}
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// Walk Loops
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while (!LQ.empty()) {
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2016-01-13 19:58:01 +00:00
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bool LoopWasDeleted = false;
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2015-12-30 11:46:15 +00:00
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CurrentLoop = LQ.back();
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2016-01-13 19:58:01 +00:00
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2009-10-14 17:57:32 +00:00
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// Run all passes on the current Loop.
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2011-10-20 21:10:27 +00:00
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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2010-09-17 15:48:55 +00:00
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LoopPass *P = getContainedPass(Index);
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2012-04-14 13:54:10 +00:00
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2009-10-14 17:57:32 +00:00
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dumpPassInfo(P, EXECUTION_MSG, ON_LOOP_MSG,
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2010-04-02 08:54:30 +00:00
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CurrentLoop->getHeader()->getName());
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2009-06-02 17:52:33 +00:00
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dumpRequiredSet(P);
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initializeAnalysisImpl(P);
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2012-04-14 13:54:10 +00:00
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2009-06-02 17:52:33 +00:00
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{
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2010-01-23 11:09:33 +00:00
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PassManagerPrettyStackEntry X(P, *CurrentLoop->getHeader());
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2010-04-02 08:54:30 +00:00
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TimeRegion PassTimer(getPassTimer(P));
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2010-01-23 11:09:33 +00:00
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Changed |= P->runOnLoop(CurrentLoop, *this);
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2009-06-02 17:52:33 +00:00
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}
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2016-01-13 19:58:01 +00:00
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LoopWasDeleted = CurrentLoop->isInvalid();
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2009-06-02 17:52:33 +00:00
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if (Changed)
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2009-10-14 17:57:32 +00:00
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dumpPassInfo(P, MODIFICATION_MSG, ON_LOOP_MSG,
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2016-01-13 19:58:01 +00:00
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LoopWasDeleted ? "<deleted>"
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: CurrentLoop->getHeader()->getName());
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2009-06-02 17:52:33 +00:00
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dumpPreservedSet(P);
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2016-01-13 19:58:01 +00:00
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if (LoopWasDeleted) {
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2015-12-30 11:46:15 +00:00
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// Notify passes that the loop is being deleted.
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deleteSimpleAnalysisLoop(CurrentLoop);
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} else {
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2009-10-14 17:57:32 +00:00
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// Manually check that this loop is still healthy. This is done
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// instead of relying on LoopInfo::verifyLoop since LoopInfo
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// is a function pass and it's really expensive to verify every
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// loop in the function every time. That level of checking can be
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// enabled with the -verify-loop-info option.
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2010-04-02 08:54:30 +00:00
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{
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2015-05-27 18:44:32 +00:00
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TimeRegion PassTimer(getPassTimer(&LIWP));
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2010-04-02 08:54:30 +00:00
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CurrentLoop->verifyLoop();
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}
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2017-01-02 19:17:04 +00:00
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// Here we apply same reasoning as in the above case. Only difference
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// is that LPPassManager might run passes which do not require LCSSA
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// form (LoopPassPrinter for example). We should skip verification for
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// such passes.
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if (mustPreserveAnalysisID(LCSSAVerificationPass::ID))
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CurrentLoop->isRecursivelyLCSSAForm(*DT, *LI);
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2009-10-14 17:57:32 +00:00
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// Then call the regular verifyAnalysis functions.
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2010-01-23 11:09:33 +00:00
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verifyPreservedAnalysis(P);
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2014-11-24 09:08:18 +00:00
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F.getContext().yield();
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2009-10-14 17:57:32 +00:00
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}
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2009-06-02 17:52:33 +00:00
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removeNotPreservedAnalysis(P);
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recordAvailableAnalysis(P);
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2016-01-13 19:58:01 +00:00
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removeDeadPasses(P, LoopWasDeleted ? "<deleted>"
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: CurrentLoop->getHeader()->getName(),
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2009-10-14 17:57:32 +00:00
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ON_LOOP_MSG);
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2009-06-02 17:52:33 +00:00
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2016-01-13 19:58:01 +00:00
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if (LoopWasDeleted)
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2009-06-02 17:52:33 +00:00
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// Do not run other passes on this loop.
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break;
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}
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2011-10-20 21:10:27 +00:00
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2009-10-14 17:57:32 +00:00
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// If the loop was deleted, release all the loop passes. This frees up
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// some memory, and avoids trouble with the pass manager trying to call
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// verifyAnalysis on them.
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2016-01-13 19:58:01 +00:00
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if (LoopWasDeleted) {
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2011-10-20 21:10:27 +00:00
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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2009-10-14 17:57:32 +00:00
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Pass *P = getContainedPass(Index);
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freePass(P, "<deleted>", ON_LOOP_MSG);
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}
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2015-12-30 11:46:15 +00:00
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}
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2009-10-14 17:57:32 +00:00
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2009-06-02 17:52:33 +00:00
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// Pop the loop from queue after running all passes.
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LQ.pop_back();
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}
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2011-10-20 21:10:27 +00:00
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2009-06-02 17:52:33 +00:00
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// Finalization
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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2010-09-17 15:48:55 +00:00
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LoopPass *P = getContainedPass(Index);
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2010-01-23 11:09:33 +00:00
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Changed |= P->doFinalization();
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2009-06-02 17:52:33 +00:00
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}
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return Changed;
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}
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/// Print passes managed by this manager
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void LPPassManager::dumpPassStructure(unsigned Offset) {
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2009-10-14 17:57:32 +00:00
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errs().indent(Offset*2) << "Loop Pass Manager\n";
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2009-06-02 17:52:33 +00:00
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for (unsigned Index = 0; Index < getNumContainedPasses(); ++Index) {
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Pass *P = getContainedPass(Index);
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P->dumpPassStructure(Offset + 1);
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dumpLastUses(P, Offset+1);
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}
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}
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//===----------------------------------------------------------------------===//
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// LoopPass
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2010-04-03 07:51:10 +00:00
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Pass *LoopPass::createPrinterPass(raw_ostream &O,
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const std::string &Banner) const {
|
2015-12-30 11:46:15 +00:00
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return new PrintLoopPassWrapper(O, Banner);
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2010-04-03 07:51:10 +00:00
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|
}
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2009-06-02 17:52:33 +00:00
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// Check if this pass is suitable for the current LPPassManager, if
|
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// available. This pass P is not suitable for a LPPassManager if P
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// is not preserving higher level analysis info used by other
|
|
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// LPPassManager passes. In such case, pop LPPassManager from the
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// stack. This will force assignPassManager() to create new
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|
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// LPPassManger as expected.
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|
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void LoopPass::preparePassManager(PMStack &PMS) {
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|
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|
2011-10-20 21:10:27 +00:00
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// Find LPPassManager
|
2009-06-02 17:52:33 +00:00
|
|
|
while (!PMS.empty() &&
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|
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PMS.top()->getPassManagerType() > PMT_LoopPassManager)
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|
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PMS.pop();
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|
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// If this pass is destroying high level information that is used
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|
|
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// by other passes that are managed by LPM then do not insert
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|
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// this pass in current LPM. Use new LPPassManager.
|
2010-01-23 11:09:33 +00:00
|
|
|
if (PMS.top()->getPassManagerType() == PMT_LoopPassManager &&
|
2011-10-20 21:10:27 +00:00
|
|
|
!PMS.top()->preserveHigherLevelAnalysis(this))
|
2009-06-02 17:52:33 +00:00
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|
PMS.pop();
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|
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|
}
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|
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|
/// Assign pass manager to manage this pass.
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|
|
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void LoopPass::assignPassManager(PMStack &PMS,
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|
|
PassManagerType PreferredType) {
|
2011-10-20 21:10:27 +00:00
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|
|
// Find LPPassManager
|
2009-06-02 17:52:33 +00:00
|
|
|
while (!PMS.empty() &&
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|
|
|
PMS.top()->getPassManagerType() > PMT_LoopPassManager)
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|
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|
PMS.pop();
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|
|
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|
2010-01-23 11:09:33 +00:00
|
|
|
LPPassManager *LPPM;
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|
|
|
if (PMS.top()->getPassManagerType() == PMT_LoopPassManager)
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|
|
|
LPPM = (LPPassManager*)PMS.top();
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|
|
|
else {
|
2011-10-20 21:10:27 +00:00
|
|
|
// Create new Loop Pass Manager if it does not exist.
|
2009-06-02 17:52:33 +00:00
|
|
|
assert (!PMS.empty() && "Unable to create Loop Pass Manager");
|
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|
|
PMDataManager *PMD = PMS.top();
|
|
|
|
|
2011-10-20 21:10:27 +00:00
|
|
|
// [1] Create new Loop Pass Manager
|
|
|
|
LPPM = new LPPassManager();
|
2009-06-02 17:52:33 +00:00
|
|
|
LPPM->populateInheritedAnalysis(PMS);
|
|
|
|
|
|
|
|
// [2] Set up new manager's top level manager
|
|
|
|
PMTopLevelManager *TPM = PMD->getTopLevelManager();
|
|
|
|
TPM->addIndirectPassManager(LPPM);
|
|
|
|
|
|
|
|
// [3] Assign manager to manage this new manager. This may create
|
|
|
|
// and push new managers into PMS
|
2010-01-23 11:09:33 +00:00
|
|
|
Pass *P = LPPM->getAsPass();
|
2009-06-02 17:52:33 +00:00
|
|
|
TPM->schedulePass(P);
|
|
|
|
|
|
|
|
// [4] Push new manager into PMS
|
|
|
|
PMS.push(LPPM);
|
|
|
|
}
|
|
|
|
|
|
|
|
LPPM->add(this);
|
|
|
|
}
|
2014-11-24 09:08:18 +00:00
|
|
|
|
2016-07-23 20:41:05 +00:00
|
|
|
bool LoopPass::skipLoop(const Loop *L) const {
|
2014-11-24 09:08:18 +00:00
|
|
|
const Function *F = L->getHeader()->getParent();
|
2016-07-23 20:41:05 +00:00
|
|
|
if (!F)
|
|
|
|
return false;
|
|
|
|
// Check the opt bisect limit.
|
|
|
|
LLVMContext &Context = F->getContext();
|
|
|
|
if (!Context.getOptBisect().shouldRunPass(this, *L))
|
|
|
|
return true;
|
|
|
|
// Check for the OptimizeNone attribute.
|
|
|
|
if (F->hasFnAttribute(Attribute::OptimizeNone)) {
|
2014-11-24 09:08:18 +00:00
|
|
|
// FIXME: Report this to dbgs() only once per function.
|
|
|
|
DEBUG(dbgs() << "Skipping pass '" << getPassName()
|
|
|
|
<< "' in function " << F->getName() << "\n");
|
|
|
|
// FIXME: Delete loop from pass manager's queue?
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
2017-01-02 19:17:04 +00:00
|
|
|
|
|
|
|
char LCSSAVerificationPass::ID = 0;
|
|
|
|
INITIALIZE_PASS(LCSSAVerificationPass, "lcssa-verification", "LCSSA Verifier",
|
|
|
|
false, false)
|
|
|
|
|