forked from OSchip/llvm-project
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
//===---- CodePreparation.cpp - Code preparation for Scop Detection -------===//
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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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// The Polly code preparation pass is executed before SCoP detection. Its
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// currently only splits the entry block of the SCoP to make room for alloc
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// instructions as they are generated during code generation.
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//
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// XXX: In the future, we should remove the need for this pass entirely and
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// instead add this spitting to the code generation pass.
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//
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//===----------------------------------------------------------------------===//
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#include "polly/LinkAllPasses.h"
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#include "polly/CodeGen/BlockGenerators.h"
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#include "polly/ScopDetection.h"
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#include "polly/Support/ScopHelper.h"
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#include "llvm/Analysis/DominanceFrontier.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/RegionInfo.h"
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#include "llvm/Analysis/ScalarEvolution.h"
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#include "llvm/Transforms/Utils/Local.h"
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using namespace llvm;
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using namespace polly;
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namespace {
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/// @brief Prepare the IR for the scop detection.
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///
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class CodePreparation : public FunctionPass {
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CodePreparation(const CodePreparation &) = delete;
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const CodePreparation &operator=(const CodePreparation &) = delete;
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LoopInfo *LI;
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ScalarEvolution *SE;
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void clear();
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bool eliminatePHINodes(Function &F);
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public:
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static char ID;
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explicit CodePreparation() : FunctionPass(ID) {}
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~CodePreparation();
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/// @name FunctionPass interface.
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//@{
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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virtual void releaseMemory();
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virtual bool runOnFunction(Function &F);
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virtual void print(raw_ostream &OS, const Module *) const;
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//@}
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};
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}
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void CodePreparation::clear() {}
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CodePreparation::~CodePreparation() { clear(); }
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void CodePreparation::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<LoopInfoWrapperPass>();
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AU.addRequired<ScalarEvolutionWrapperPass>();
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AU.addPreserved<LoopInfoWrapperPass>();
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AU.addPreserved<RegionInfoPass>();
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AU.addPreserved<DominatorTreeWrapperPass>();
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AU.addPreserved<DominanceFrontier>();
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}
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bool CodePreparation::runOnFunction(Function &F) {
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LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
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SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
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splitEntryBlockForAlloca(&F.getEntryBlock(), this);
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return false;
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}
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void CodePreparation::releaseMemory() { clear(); }
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void CodePreparation::print(raw_ostream &OS, const Module *) const {}
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char CodePreparation::ID = 0;
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char &polly::CodePreparationID = CodePreparation::ID;
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Pass *polly::createCodePreparationPass() { return new CodePreparation(); }
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INITIALIZE_PASS_BEGIN(CodePreparation, "polly-prepare",
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"Polly - Prepare code for polly", false, false)
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INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
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INITIALIZE_PASS_END(CodePreparation, "polly-prepare",
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"Polly - Prepare code for polly", false, false)
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