forked from OSchip/llvm-project
120 lines
3.8 KiB
C++
120 lines
3.8 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/LinkAllPasses.h"
|
|
#include "polly/ScopDetection.h"
|
|
#include "llvm/Analysis/CallGraph.h"
|
|
#include "llvm/Analysis/CallGraphSCCPass.h"
|
|
#include "llvm/IR/PassManager.h"
|
|
#include "llvm/Passes/PassBuilder.h"
|
|
#include "llvm/Transforms/IPO/AlwaysInliner.h"
|
|
|
|
#define DEBUG_TYPE "polly-scop-inliner"
|
|
|
|
using namespace polly;
|
|
extern bool polly::PollyAllowFullFunction;
|
|
|
|
namespace {
|
|
class ScopInliner : public CallGraphSCCPass {
|
|
using llvm::Pass::doInitialization;
|
|
|
|
public:
|
|
static char ID;
|
|
|
|
ScopInliner() : CallGraphSCCPass(ID) {}
|
|
|
|
bool doInitialization(CallGraph &CG) override {
|
|
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");
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool runOnSCC(CallGraphSCC &SCC) override {
|
|
// 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");
|
|
Function *F = (*SCC.begin())->getFunction();
|
|
|
|
// If the function is a nullptr, or the function is a declaration.
|
|
if (!F)
|
|
return false;
|
|
if (F->isDeclaration()) {
|
|
LLVM_DEBUG(dbgs() << "Skipping " << F->getName()
|
|
<< "because it is a declaration.\n");
|
|
return false;
|
|
}
|
|
|
|
PassBuilder PB;
|
|
FunctionAnalysisManager FAM;
|
|
FAM.registerPass([] { return ScopAnalysis(); });
|
|
PB.registerFunctionAnalyses(FAM);
|
|
|
|
RegionInfo &RI = FAM.getResult<RegionInfoAnalysis>(*F);
|
|
ScopDetection &SD = FAM.getResult<ScopAnalysis>(*F);
|
|
|
|
const bool HasScopAsTopLevelRegion =
|
|
SD.ValidRegions.count(RI.getTopLevelRegion()) > 0;
|
|
|
|
if (HasScopAsTopLevelRegion) {
|
|
LLVM_DEBUG(dbgs() << "Skipping " << F->getName()
|
|
<< " has scop as top level region");
|
|
F->addFnAttr(llvm::Attribute::AlwaysInline);
|
|
|
|
ModuleAnalysisManager MAM;
|
|
PB.registerModuleAnalyses(MAM);
|
|
MAM.registerPass([&] { return FunctionAnalysisManagerModuleProxy(FAM); });
|
|
ModulePassManager MPM;
|
|
MPM.addPass(AlwaysInlinerPass());
|
|
Module *M = F->getParent();
|
|
assert(M && "Function has illegal module");
|
|
MPM.run(*M, MAM);
|
|
} else {
|
|
LLVM_DEBUG(dbgs() << F->getName()
|
|
<< " does NOT have scop as top level region\n");
|
|
}
|
|
|
|
return false;
|
|
};
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const override {
|
|
CallGraphSCCPass::getAnalysisUsage(AU);
|
|
}
|
|
};
|
|
} // namespace
|
|
char ScopInliner::ID;
|
|
|
|
Pass *polly::createScopInlinerPass() {
|
|
ScopInliner *pass = new ScopInliner();
|
|
return pass;
|
|
}
|
|
|
|
INITIALIZE_PASS_BEGIN(
|
|
ScopInliner, "polly-scop-inliner",
|
|
"inline functions based on how much of the function is a scop.", false,
|
|
false)
|
|
INITIALIZE_PASS_END(
|
|
ScopInliner, "polly-scop-inliner",
|
|
"inline functions based on how much of the function is a scop.", false,
|
|
false)
|