mirror of
https://github.com/intel/llvm.git
synced 2026-01-13 02:38:07 +08:00
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 ----------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Take a SCC and:
|
|
// 1. If it has more than one component, bail out (contains cycles)
|
|
// 2. If it has just one component, and if the function is entirely a scop,
|
|
// inline it.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "polly/ScopInliner.h"
|
|
#include "polly/ScopDetection.h"
|
|
#include "polly/ScopInliner.h"
|
|
#include "llvm/Analysis/CallGraph.h"
|
|
#include "llvm/Analysis/CallGraphSCCPass.h"
|
|
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
|
|
#include "llvm/Analysis/RegionInfo.h"
|
|
#include "llvm/IR/Dominators.h"
|
|
#include "llvm/Passes/PassBuilder.h"
|
|
#include "llvm/Transforms/IPO/AlwaysInliner.h"
|
|
|
|
#include "polly/Support/PollyDebug.h"
|
|
#define DEBUG_TYPE "polly-scop-inliner"
|
|
|
|
using namespace llvm;
|
|
using namespace polly;
|
|
|
|
namespace {
|
|
|
|
/// Inliner implementation that works with both, LPM (using SCC_t=CallGraph) and
|
|
/// NPM (using SCC_t=LazyCallGraph::SCC)
|
|
template <typename SCC_t> bool runScopInlinerImpl(Function *F, SCC_t &SCC) {
|
|
// We do not try to inline non-trivial SCCs because this would lead to
|
|
// "infinite" inlining if we are not careful.
|
|
if (SCC.size() > 1)
|
|
return false;
|
|
assert(SCC.size() == 1 && "found empty SCC");
|
|
|
|
// If the function is a nullptr, or the function is a declaration.
|
|
if (!F)
|
|
return false;
|
|
if (F->isDeclaration()) {
|
|
POLLY_DEBUG(dbgs() << "Skipping " << F->getName()
|
|
<< "because it is a declaration.\n");
|
|
return false;
|
|
}
|
|
|
|
PassBuilder PB;
|
|
// Populate analysis managers and register Polly-specific analyses.
|
|
LoopAnalysisManager LAM;
|
|
FunctionAnalysisManager FAM;
|
|
CGSCCAnalysisManager CGAM;
|
|
ModuleAnalysisManager MAM;
|
|
PB.registerModuleAnalyses(MAM);
|
|
PB.registerCGSCCAnalyses(CGAM);
|
|
PB.registerFunctionAnalyses(FAM);
|
|
PB.registerLoopAnalyses(LAM);
|
|
PB.crossRegisterProxies(LAM, FAM, CGAM, MAM);
|
|
|
|
auto &DT = FAM.getResult<DominatorTreeAnalysis>(*F);
|
|
auto &SE = FAM.getResult<ScalarEvolutionAnalysis>(*F);
|
|
auto &LI = FAM.getResult<LoopAnalysis>(*F);
|
|
auto &RI = FAM.getResult<RegionInfoAnalysis>(*F);
|
|
auto &AA = FAM.getResult<AAManager>(*F);
|
|
auto &ORE = FAM.getResult<OptimizationRemarkEmitterAnalysis>(*F);
|
|
ScopDetection SD(DT, SE, LI, RI, AA, ORE);
|
|
SD.detect(*F);
|
|
|
|
const bool HasScopAsTopLevelRegion =
|
|
SD.ValidRegions.contains(RI.getTopLevelRegion());
|
|
|
|
bool Changed = false;
|
|
if (HasScopAsTopLevelRegion) {
|
|
POLLY_DEBUG(dbgs() << "Skipping " << F->getName()
|
|
<< " has scop as top level region");
|
|
F->addFnAttr(llvm::Attribute::AlwaysInline);
|
|
|
|
ModulePassManager MPM;
|
|
MPM.addPass(AlwaysInlinerPass());
|
|
Module *M = F->getParent();
|
|
assert(M && "Function has illegal module");
|
|
PreservedAnalyses PA = MPM.run(*M, MAM);
|
|
if (!PA.areAllPreserved())
|
|
Changed = true;
|
|
} else {
|
|
POLLY_DEBUG(dbgs() << F->getName()
|
|
<< " does NOT have scop as top level region\n");
|
|
}
|
|
|
|
return Changed;
|
|
}
|
|
} // namespace
|
|
|
|
polly::ScopInlinerPass::ScopInlinerPass() {
|
|
if (!polly::PollyAllowFullFunction) {
|
|
report_fatal_error(
|
|
"Aborting from ScopInliner because it only makes sense to run with "
|
|
"-polly-allow-full-function. "
|
|
"The heurtistic for ScopInliner checks that the full function is a "
|
|
"Scop, which happens if and only if polly-allow-full-function is "
|
|
" enabled. "
|
|
" If not, the entry block is not included in the Scop");
|
|
}
|
|
}
|
|
|
|
PreservedAnalyses polly::ScopInlinerPass::run(llvm::LazyCallGraph::SCC &SCC,
|
|
llvm::CGSCCAnalysisManager &AM,
|
|
llvm::LazyCallGraph &CG,
|
|
llvm::CGSCCUpdateResult &UR) {
|
|
Function *F = &SCC.begin()->getFunction();
|
|
bool Changed = runScopInlinerImpl(F, SCC);
|
|
return Changed ? PreservedAnalyses::none() : PreservedAnalyses::all();
|
|
}
|