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//===- LoopExtractor.cpp - Extract each loop into a new function ----------===//
//
// A pass wrapper around the ExtractLoop() scalar transformation to extract each
// top-level loop into its own new function. If the loop is the ONLY loop in a
// given function, it is not touched.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/FunctionUtils.h"
#include <vector>
using namespace llvm;
namespace {
// FIXME: PassManager should allow Module passes to require FunctionPasses
struct LoopExtraction : public FunctionPass {
public:
LoopExtractor() {}
virtual bool run(Module &M);
virtual bool runOnFunction(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<LoopInfo>();
}
};
RegisterOpt<LoopExtractor>
X("loop-extract", "Extract loops into new functions");
bool LoopExtractor::run(Module &M) {
bool Changed = false;
for (Module::iterator i = M.begin(), e = M.end(); i != e; ++i)
Changed |= runOnFunction(*i);
return Changed;
}
bool LoopExtractor::runOnFunction(Function &F) {
std::cerr << F.getName() << "\n";
LoopInfo &LI = getAnalysis<LoopInfo>();
// We don't want to keep extracting the only loop of a function into a new one
if (LI.begin() == LI.end() || LI.begin() + 1 == LI.end())
return false;
bool Changed = false;
// Try to move each loop out of the code into separate function
for (LoopInfo::iterator i = LI.begin(), e = LI.end(); i != e; ++i)
Changed |= (ExtractLoop(*i) != 0);
return Changed;
}
} // End anonymous namespace
/// createLoopExtractorPass
///
FunctionPass* llvm::createLoopExtractorPass() {
return new LoopExtractor;
}
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