#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/Dominators.h"
-#include "llvm/Analysis/LoopInfo.h"
+#include "llvm/Analysis/LoopPass.h"
#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Compiler.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Utils/FunctionUtils.h"
#include "llvm/ADT/Statistic.h"
STATISTIC(NumExtracted, "Number of loops extracted");
namespace {
- // FIXME: This is not a function pass, but the PassManager doesn't allow
- // Module passes to require FunctionPasses, so we can't get loop info if we're
- // not a function pass.
- struct VISIBILITY_HIDDEN LoopExtractor : public FunctionPass {
+ struct LoopExtractor : public LoopPass {
static char ID; // Pass identification, replacement for typeid
unsigned NumLoops;
explicit LoopExtractor(unsigned numLoops = ~0)
- : FunctionPass((intptr_t)&ID), NumLoops(numLoops) {}
+ : LoopPass(&ID), NumLoops(numLoops) {}
- virtual bool runOnFunction(Function &F);
+ virtual bool runOnLoop(Loop *L, LPPassManager &LPM);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredID(BreakCriticalEdgesID);
AU.addRequiredID(LoopSimplifyID);
AU.addRequired<DominatorTree>();
- AU.addRequired<LoopInfo>();
}
};
}
// createLoopExtractorPass - This pass extracts all natural loops from the
// program into a function if it can.
//
-FunctionPass *llvm::createLoopExtractorPass() { return new LoopExtractor(); }
+Pass *llvm::createLoopExtractorPass() { return new LoopExtractor(); }
-bool LoopExtractor::runOnFunction(Function &F) {
- LoopInfo &LI = getAnalysis<LoopInfo>();
+bool LoopExtractor::runOnLoop(Loop *L, LPPassManager &LPM) {
+ // Only visit top-level loops.
+ if (L->getParentLoop())
+ return false;
- // If this function has no loops, there is nothing to do.
- if (LI.begin() == LI.end())
+ // If LoopSimplify form is not available, stay out of trouble.
+ if (!L->isLoopSimplifyForm())
return false;
DominatorTree &DT = getAnalysis<DominatorTree>();
-
- // If there is more than one top-level loop in this function, extract all of
- // the loops.
bool Changed = false;
- if (LI.end()-LI.begin() > 1) {
- for (LoopInfo::iterator i = LI.begin(), e = LI.end(); i != e; ++i) {
- if (NumLoops == 0) return Changed;
- --NumLoops;
- Changed |= ExtractLoop(DT, *i) != 0;
- ++NumExtracted;
- }
- } else {
- // Otherwise there is exactly one top-level loop. If this function is more
- // than a minimal wrapper around the loop, extract the loop.
- Loop *TLL = *LI.begin();
- bool ShouldExtractLoop = false;
-
- // Extract the loop if the entry block doesn't branch to the loop header.
- TerminatorInst *EntryTI = F.getEntryBlock().getTerminator();
- if (!isa<BranchInst>(EntryTI) ||
- !cast<BranchInst>(EntryTI)->isUnconditional() ||
- EntryTI->getSuccessor(0) != TLL->getHeader())
- ShouldExtractLoop = true;
- else {
- // Check to see if any exits from the loop are more than just return
- // blocks.
- SmallVector<BasicBlock*, 8> ExitBlocks;
- TLL->getExitBlocks(ExitBlocks);
- for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i)
- if (!isa<ReturnInst>(ExitBlocks[i]->getTerminator())) {
- ShouldExtractLoop = true;
- break;
- }
- }
- if (ShouldExtractLoop) {
- if (NumLoops == 0) return Changed;
- --NumLoops;
- Changed |= ExtractLoop(DT, TLL) != 0;
- ++NumExtracted;
- } else {
- // Okay, this function is a minimal container around the specified loop.
- // If we extract the loop, we will continue to just keep extracting it
- // infinitely... so don't extract it. However, if the loop contains any
- // subloops, extract them.
- for (Loop::iterator i = TLL->begin(), e = TLL->end(); i != e; ++i) {
- if (NumLoops == 0) return Changed;
- --NumLoops;
- Changed |= ExtractLoop(DT, *i) != 0;
- ++NumExtracted;
+ // If there is more than one top-level loop in this function, extract all of
+ // the loops. Otherwise there is exactly one top-level loop; in this case if
+ // this function is more than a minimal wrapper around the loop, extract
+ // the loop.
+ bool ShouldExtractLoop = false;
+
+ // Extract the loop if the entry block doesn't branch to the loop header.
+ TerminatorInst *EntryTI =
+ L->getHeader()->getParent()->getEntryBlock().getTerminator();
+ if (!isa<BranchInst>(EntryTI) ||
+ !cast<BranchInst>(EntryTI)->isUnconditional() ||
+ EntryTI->getSuccessor(0) != L->getHeader())
+ ShouldExtractLoop = true;
+ else {
+ // Check to see if any exits from the loop are more than just return
+ // blocks.
+ SmallVector<BasicBlock*, 8> ExitBlocks;
+ L->getExitBlocks(ExitBlocks);
+ for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i)
+ if (!isa<ReturnInst>(ExitBlocks[i]->getTerminator())) {
+ ShouldExtractLoop = true;
+ break;
}
+ }
+ if (ShouldExtractLoop) {
+ if (NumLoops == 0) return Changed;
+ --NumLoops;
+ if (ExtractLoop(DT, L) != 0) {
+ Changed = true;
+ // After extraction, the loop is replaced by a function call, so
+ // we shouldn't try to run any more loop passes on it.
+ LPM.deleteLoopFromQueue(L);
}
+ ++NumExtracted;
}
return Changed;
// createSingleLoopExtractorPass - This pass extracts one natural loop from the
// program into a function if it can. This is used by bugpoint.
//
-FunctionPass *llvm::createSingleLoopExtractorPass() {
+Pass *llvm::createSingleLoopExtractorPass() {
return new SingleLoopExtractor();
}
public:
static char ID; // Pass identification, replacement for typeid
explicit BlockExtractorPass(const std::vector<BasicBlock*> &B)
- : ModulePass((intptr_t)&ID), BlocksToNotExtract(B) {
+ : ModulePass(&ID), BlocksToNotExtract(B) {
if (!BlockFile.empty())
LoadFile(BlockFile.c_str());
}
- BlockExtractorPass() : ModulePass((intptr_t)&ID) {}
+ BlockExtractorPass() : ModulePass(&ID) {}
bool runOnModule(Module &M);
};
// Load the BlockFile...
std::ifstream In(Filename);
if (!In.good()) {
- cerr << "WARNING: BlockExtractor couldn't load file '" << Filename
- << "'!\n";
+ errs() << "WARNING: BlockExtractor couldn't load file '" << Filename
+ << "'!\n";
return;
}
while (In) {
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