121 lines
3.7 KiB
C++
121 lines
3.7 KiB
C++
//===---- CodePreparation.cpp - Code preparation for Scop Detection -------===//
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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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// 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/CodePreparation.h"
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#include "polly/LinkAllPasses.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/InitializePasses.h"
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using namespace llvm;
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using namespace polly;
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namespace {
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/// Prepare the IR for the scop detection.
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///
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class CodePreparation final : 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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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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void getAnalysisUsage(AnalysisUsage &AU) const override;
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void releaseMemory() override;
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bool runOnFunction(Function &F) override;
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void print(raw_ostream &OS, const Module *) const override;
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//@}
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};
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} // namespace
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PreservedAnalyses CodePreparationPass::run(Function &F,
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FunctionAnalysisManager &FAM) {
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// Find first non-alloca instruction. Every basic block has a non-alloca
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// instruction, as every well formed basic block has a terminator.
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auto &EntryBlock = F.getEntryBlock();
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BasicBlock::iterator I = EntryBlock.begin();
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while (isa<AllocaInst>(I))
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++I;
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auto &DT = FAM.getResult<DominatorTreeAnalysis>(F);
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auto &LI = FAM.getResult<LoopAnalysis>(F);
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// splitBlock updates DT, LI and RI.
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splitEntryBlockForAlloca(&EntryBlock, &DT, &LI, nullptr);
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PreservedAnalyses PA;
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PA.preserve<DominatorTreeAnalysis>();
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PA.preserve<LoopAnalysis>();
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return PA;
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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<DominanceFrontierWrapperPass>();
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}
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bool CodePreparation::runOnFunction(Function &F) {
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if (skipFunction(F))
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return false;
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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 true;
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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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