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f12ad95991
PR #125442 replaces the pass-based Polly architecture with a monolithic pass consisting of phases. Reasons listed in https://github.com/llvm/llvm-project/pull/125442. With this change, the SCoP-passes became redundant problematic versions of the same functionality and are removed.
119 lines
4.2 KiB
C++
119 lines
4.2 KiB
C++
//===---- ScopInliner.cpp - Polyhedral based inliner ----------------------===//
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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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// Take a SCC and:
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// 1. If it has more than one component, bail out (contains cycles)
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// 2. If it has just one component, and if the function is entirely a scop,
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// inline it.
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//
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//===----------------------------------------------------------------------===//
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#include "polly/ScopInliner.h"
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#include "polly/ScopDetection.h"
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#include "polly/ScopInliner.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Analysis/CallGraphSCCPass.h"
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#include "llvm/Analysis/OptimizationRemarkEmitter.h"
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#include "llvm/Analysis/RegionInfo.h"
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#include "llvm/IR/Dominators.h"
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#include "llvm/Passes/PassBuilder.h"
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#include "llvm/Transforms/IPO/AlwaysInliner.h"
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#include "polly/Support/PollyDebug.h"
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#define DEBUG_TYPE "polly-scop-inliner"
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using namespace llvm;
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using namespace polly;
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namespace {
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/// Inliner implementation that works with both, LPM (using SCC_t=CallGraph) and
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/// NPM (using SCC_t=LazyCallGraph::SCC)
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template <typename SCC_t> bool runScopInlinerImpl(Function *F, SCC_t &SCC) {
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// We do not try to inline non-trivial SCCs because this would lead to
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// "infinite" inlining if we are not careful.
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if (SCC.size() > 1)
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return false;
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assert(SCC.size() == 1 && "found empty SCC");
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// If the function is a nullptr, or the function is a declaration.
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if (!F)
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return false;
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if (F->isDeclaration()) {
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POLLY_DEBUG(dbgs() << "Skipping " << F->getName()
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<< "because it is a declaration.\n");
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return false;
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}
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PassBuilder PB;
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// Populate analysis managers and register Polly-specific analyses.
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LoopAnalysisManager LAM;
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FunctionAnalysisManager FAM;
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CGSCCAnalysisManager CGAM;
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ModuleAnalysisManager MAM;
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PB.registerModuleAnalyses(MAM);
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PB.registerCGSCCAnalyses(CGAM);
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PB.registerFunctionAnalyses(FAM);
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PB.registerLoopAnalyses(LAM);
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PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
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auto &DT = FAM.getResult<DominatorTreeAnalysis>(*F);
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auto &SE = FAM.getResult<ScalarEvolutionAnalysis>(*F);
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auto &LI = FAM.getResult<LoopAnalysis>(*F);
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auto &RI = FAM.getResult<RegionInfoAnalysis>(*F);
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auto &AA = FAM.getResult<AAManager>(*F);
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auto &ORE = FAM.getResult<OptimizationRemarkEmitterAnalysis>(*F);
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ScopDetection SD(DT, SE, LI, RI, AA, ORE);
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SD.detect(*F);
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const bool HasScopAsTopLevelRegion =
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SD.ValidRegions.contains(RI.getTopLevelRegion());
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bool Changed = false;
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if (HasScopAsTopLevelRegion) {
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POLLY_DEBUG(dbgs() << "Skipping " << F->getName()
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<< " has scop as top level region");
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F->addFnAttr(llvm::Attribute::AlwaysInline);
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ModulePassManager MPM;
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MPM.addPass(AlwaysInlinerPass());
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Module *M = F->getParent();
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assert(M && "Function has illegal module");
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PreservedAnalyses PA = MPM.run(*M, MAM);
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if (!PA.areAllPreserved())
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Changed = true;
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} else {
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POLLY_DEBUG(dbgs() << F->getName()
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<< " does NOT have scop as top level region\n");
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}
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return Changed;
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}
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} // namespace
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polly::ScopInlinerPass::ScopInlinerPass() {
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if (!polly::PollyAllowFullFunction) {
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report_fatal_error(
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"Aborting from ScopInliner because it only makes sense to run with "
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"-polly-allow-full-function. "
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"The heurtistic for ScopInliner checks that the full function is a "
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"Scop, which happens if and only if polly-allow-full-function is "
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" enabled. "
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" If not, the entry block is not included in the Scop");
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}
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}
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PreservedAnalyses polly::ScopInlinerPass::run(llvm::LazyCallGraph::SCC &SCC,
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llvm::CGSCCAnalysisManager &AM,
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llvm::LazyCallGraph &CG,
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llvm::CGSCCUpdateResult &UR) {
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Function *F = &SCC.begin()->getFunction();
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bool Changed = runScopInlinerImpl(F, SCC);
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return Changed ? PreservedAnalyses::none() : PreservedAnalyses::all();
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}
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