forked from OSchip/llvm-project
123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
//===---- CodePreparation.cpp - Code preparation for Scop Detection -------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The Polly code preparation pass is executed before SCoP detection. Its
|
|
// currently only splits the entry block of the SCoP to make room for alloc
|
|
// instructions as they are generated during code generation.
|
|
//
|
|
// XXX: In the future, we should remove the need for this pass entirely and
|
|
// instead add this spitting to the code generation pass.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "polly/CodePreparation.h"
|
|
#include "polly/LinkAllPasses.h"
|
|
#include "polly/ScopDetection.h"
|
|
#include "polly/Support/ScopHelper.h"
|
|
#include "llvm/Analysis/DominanceFrontier.h"
|
|
#include "llvm/Analysis/LoopInfo.h"
|
|
#include "llvm/Analysis/RegionInfo.h"
|
|
#include "llvm/Analysis/ScalarEvolution.h"
|
|
#include "llvm/Transforms/Utils/Local.h"
|
|
|
|
using namespace llvm;
|
|
using namespace polly;
|
|
|
|
namespace {
|
|
|
|
/// Prepare the IR for the scop detection.
|
|
///
|
|
class CodePreparation : public FunctionPass {
|
|
CodePreparation(const CodePreparation &) = delete;
|
|
const CodePreparation &operator=(const CodePreparation &) = delete;
|
|
|
|
LoopInfo *LI;
|
|
ScalarEvolution *SE;
|
|
|
|
void clear();
|
|
|
|
public:
|
|
static char ID;
|
|
|
|
explicit CodePreparation() : FunctionPass(ID) {}
|
|
~CodePreparation();
|
|
|
|
/// @name FunctionPass interface.
|
|
//@{
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
|
|
virtual void releaseMemory();
|
|
virtual bool runOnFunction(Function &F);
|
|
virtual void print(raw_ostream &OS, const Module *) const;
|
|
//@}
|
|
};
|
|
} // namespace
|
|
|
|
PreservedAnalyses CodePreparationPass::run(Function &F,
|
|
FunctionAnalysisManager &FAM) {
|
|
|
|
// Find first non-alloca instruction. Every basic block has a non-alloca
|
|
// instruction, as every well formed basic block has a terminator.
|
|
auto &EntryBlock = F.getEntryBlock();
|
|
BasicBlock::iterator I = EntryBlock.begin();
|
|
while (isa<AllocaInst>(I))
|
|
++I;
|
|
|
|
auto &DT = FAM.getResult<DominatorTreeAnalysis>(F);
|
|
auto &LI = FAM.getResult<LoopAnalysis>(F);
|
|
|
|
// splitBlock updates DT, LI and RI.
|
|
splitEntryBlockForAlloca(&EntryBlock, &DT, &LI, nullptr);
|
|
|
|
PreservedAnalyses PA;
|
|
PA.preserve<DominatorTreeAnalysis>();
|
|
PA.preserve<LoopAnalysis>();
|
|
return PA;
|
|
}
|
|
|
|
void CodePreparation::clear() {}
|
|
|
|
CodePreparation::~CodePreparation() { clear(); }
|
|
|
|
void CodePreparation::getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.addRequired<LoopInfoWrapperPass>();
|
|
AU.addRequired<ScalarEvolutionWrapperPass>();
|
|
|
|
AU.addPreserved<LoopInfoWrapperPass>();
|
|
AU.addPreserved<RegionInfoPass>();
|
|
AU.addPreserved<DominatorTreeWrapperPass>();
|
|
AU.addPreserved<DominanceFrontierWrapperPass>();
|
|
}
|
|
|
|
bool CodePreparation::runOnFunction(Function &F) {
|
|
if (skipFunction(F))
|
|
return false;
|
|
|
|
LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
|
|
SE = &getAnalysis<ScalarEvolutionWrapperPass>().getSE();
|
|
|
|
splitEntryBlockForAlloca(&F.getEntryBlock(), this);
|
|
|
|
return true;
|
|
}
|
|
|
|
void CodePreparation::releaseMemory() { clear(); }
|
|
|
|
void CodePreparation::print(raw_ostream &OS, const Module *) const {}
|
|
|
|
char CodePreparation::ID = 0;
|
|
char &polly::CodePreparationID = CodePreparation::ID;
|
|
|
|
Pass *polly::createCodePreparationPass() { return new CodePreparation(); }
|
|
|
|
INITIALIZE_PASS_BEGIN(CodePreparation, "polly-prepare",
|
|
"Polly - Prepare code for polly", false, false)
|
|
INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
|
|
INITIALIZE_PASS_END(CodePreparation, "polly-prepare",
|
|
"Polly - Prepare code for polly", false, false)
|