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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
120 lines
3.7 KiB
C++
120 lines
3.7 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/LinkAllPasses.h"
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#include "polly/RegisterPasses.h"
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#include "polly/ScopDetection.h"
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#include "llvm/Analysis/CallGraphSCCPass.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/Passes/PassBuilder.h"
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#include "llvm/Transforms/IPO/AlwaysInliner.h"
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#define DEBUG_TYPE "polly-scop-inliner"
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using namespace polly;
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extern bool polly::PollyAllowFullFunction;
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namespace {
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class ScopInliner : public CallGraphSCCPass {
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using llvm::Pass::doInitialization;
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public:
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static char ID;
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ScopInliner() : CallGraphSCCPass(ID) {}
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bool doInitialization(CallGraph &CG) override {
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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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return true;
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}
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bool runOnSCC(CallGraphSCC &SCC) override {
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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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Function *F = (*SCC.begin())->getFunction();
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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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LLVM_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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FunctionAnalysisManager FAM;
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FAM.registerPass([] { return ScopAnalysis(); });
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PB.registerFunctionAnalyses(FAM);
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RegionInfo &RI = FAM.getResult<RegionInfoAnalysis>(*F);
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ScopDetection &SD = FAM.getResult<ScopAnalysis>(*F);
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const bool HasScopAsTopLevelRegion =
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SD.ValidRegions.count(RI.getTopLevelRegion()) > 0;
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if (HasScopAsTopLevelRegion) {
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LLVM_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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ModuleAnalysisManager MAM;
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PB.registerModuleAnalyses(MAM);
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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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MPM.run(*M, MAM);
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} else {
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LLVM_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 false;
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};
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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CallGraphSCCPass::getAnalysisUsage(AU);
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}
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};
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} // namespace
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char ScopInliner::ID;
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Pass *polly::createScopInlinerPass() {
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ScopInliner *pass = new ScopInliner();
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return pass;
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}
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INITIALIZE_PASS_BEGIN(
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ScopInliner, "polly-scop-inliner",
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"inline functions based on how much of the function is a scop.", false,
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false)
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INITIALIZE_PASS_END(
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ScopInliner, "polly-scop-inliner",
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"inline functions based on how much of the function is a scop.", false,
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false)
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