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4904b56b75
This is a fairly straightforward port to the new pass manager with one exception. It removes a very questionable use of releaseMemory() in the old pass to invalidate its caches between runs on a function. I don't think this is really guaranteed to be safe. I've just used the more direct port to the new PM to address this by nuking the results object each time the pass runs. While this could cause some minor malloc traffic increase, I don't expect the compile time performance hit to be noticable, and it makes the correctness and other aspects of the pass much easier to reason about. In some cases, it may make things faster by making the sets and maps smaller with better locality. Indeed, the measurements collected by Bruno (thanks!!!) show mostly compile time improvements. There is sadly very limited testing at this point as there are only two tests of memdep, and both rely on GVN. I'll be porting GVN next and that will exercise this heavily though. Differential Revision: http://reviews.llvm.org/D17962 llvm-svn: 263082
69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
//===-- MachineFunctionPass.cpp -------------------------------------------===//
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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 contains the definitions of the MachineFunctionPass members.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Analysis/BasicAliasAnalysis.h"
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#include "llvm/Analysis/DominanceFrontier.h"
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#include "llvm/Analysis/GlobalsModRef.h"
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#include "llvm/Analysis/IVUsers.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/MemoryDependenceAnalysis.h"
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
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#include "llvm/CodeGen/MachineFunctionAnalysis.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/StackProtector.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/IR/Function.h"
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using namespace llvm;
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Pass *MachineFunctionPass::createPrinterPass(raw_ostream &O,
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const std::string &Banner) const {
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return createMachineFunctionPrinterPass(O, Banner);
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}
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bool MachineFunctionPass::runOnFunction(Function &F) {
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// Do not codegen any 'available_externally' functions at all, they have
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// definitions outside the translation unit.
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if (F.hasAvailableExternallyLinkage())
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return false;
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MachineFunction &MF = getAnalysis<MachineFunctionAnalysis>().getMF();
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return runOnMachineFunction(MF);
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}
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void MachineFunctionPass::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<MachineFunctionAnalysis>();
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AU.addPreserved<MachineFunctionAnalysis>();
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// MachineFunctionPass preserves all LLVM IR passes, but there's no
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// high-level way to express this. Instead, just list a bunch of
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// passes explicitly. This does not include setPreservesCFG,
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// because CodeGen overloads that to mean preserving the MachineBasicBlock
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// CFG in addition to the LLVM IR CFG.
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AU.addPreserved<BasicAAWrapperPass>();
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AU.addPreserved<DominanceFrontierWrapperPass>();
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AU.addPreserved<DominatorTreeWrapperPass>();
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AU.addPreserved<AAResultsWrapperPass>();
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AU.addPreserved<GlobalsAAWrapperPass>();
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AU.addPreserved<IVUsers>();
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AU.addPreserved<LoopInfoWrapperPass>();
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AU.addPreserved<MemoryDependenceWrapperPass>();
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AU.addPreserved<ScalarEvolutionWrapperPass>();
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AU.addPreserved<SCEVAAWrapperPass>();
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AU.addPreserved<StackProtector>();
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FunctionPass::getAnalysisUsage(AU);
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}
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