#include "llvm/IR/Constants.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Instructions.h"
+#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
+#include "llvm/IR/PassManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace llvm;
VerifyLoopInfoX("verify-loop-info", cl::location(VerifyLoopInfo),
cl::desc("Verify loop info (time consuming)"));
-char LoopInfo::ID = 0;
-INITIALIZE_PASS_BEGIN(LoopInfo, "loops", "Natural Loop Information", true, true)
-INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
-INITIALIZE_PASS_END(LoopInfo, "loops", "Natural Loop Information", true, true)
-
// Loop identifier metadata name.
static const char *const LoopMDName = "llvm.loop";
/// isLoopInvariant - Return true if the specified value is loop invariant
///
-bool Loop::isLoopInvariant(Value *V) const {
- if (Instruction *I = dyn_cast<Instruction>(V))
+bool Loop::isLoopInvariant(const Value *V) const {
+ if (const Instruction *I = dyn_cast<Instruction>(V))
return !contains(I);
return true; // All non-instructions are loop invariant
}
/// hasLoopInvariantOperands - Return true if all the operands of the
/// specified instruction are loop invariant.
-bool Loop::hasLoopInvariantOperands(Instruction *I) const {
- for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i)
- if (!isLoopInvariant(I->getOperand(i)))
- return false;
-
- return true;
+bool Loop::hasLoopInvariantOperands(const Instruction *I) const {
+ return all_of(I->operands(), [this](Value *V) { return isLoopInvariant(V); });
}
/// makeLoopInvariant - If the given value is an instruciton inside of the
return false;
if (I->mayReadFromMemory())
return false;
- // The landingpad instruction is immobile.
- if (isa<LandingPadInst>(I))
+ // EH block instructions are immobile.
+ if (I->isEHPad())
return false;
// Determine the insertion point, unless one was given.
if (!InsertPt) {
if (CI->cannotDuplicate())
return false;
}
+ if (BI->getType()->isTokenTy() && BI->isUsedOutsideOfBlock(*I))
+ return false;
}
}
return true;
// directly or indirectly through another list metadata (in case of
// nested parallel loops). The loop identifier metadata refers to
// itself so we can check both cases with the same routine.
- MDNode *loopIdMD = II->getMetadata("llvm.mem.parallel_loop_access");
+ MDNode *loopIdMD =
+ II->getMetadata(LLVMContext::MD_mem_parallel_loop_access);
if (!loopIdMD)
return false;
return NearLoop;
}
-//===----------------------------------------------------------------------===//
-// LoopInfo implementation
-//
-bool LoopInfo::runOnFunction(Function &) {
- releaseMemory();
- LI.Analyze(getAnalysis<DominatorTreeWrapperPass>().getDomTree());
- return false;
+LoopInfo::LoopInfo(const DominatorTreeBase<BasicBlock> &DomTree) {
+ analyze(DomTree);
}
/// updateUnloop - The last backedge has been removed from a loop--now the
if (!Unloop->getParentLoop()) {
// Since BBLoop had no parent, Unloop blocks are no longer in a loop.
for (Loop::block_iterator I = Unloop->block_begin(),
- E = Unloop->block_end(); I != E; ++I) {
+ E = Unloop->block_end();
+ I != E; ++I) {
// Don't reparent blocks in subloops.
if (getLoopFor(*I) != Unloop)
// Blocks no longer have a parent but are still referenced by Unloop until
// the Unloop object is deleted.
- LI.changeLoopFor(*I, nullptr);
+ changeLoopFor(*I, nullptr);
}
// Remove the loop from the top-level LoopInfo object.
- for (LoopInfo::iterator I = LI.begin();; ++I) {
- assert(I != LI.end() && "Couldn't find loop");
+ for (iterator I = begin();; ++I) {
+ assert(I != end() && "Couldn't find loop");
if (*I == Unloop) {
- LI.removeLoop(I);
+ removeLoop(I);
break;
}
}
// Move all of the subloops to the top-level.
while (!Unloop->empty())
- LI.addTopLevelLoop(Unloop->removeChildLoop(std::prev(Unloop->end())));
+ addTopLevelLoop(Unloop->removeChildLoop(std::prev(Unloop->end())));
return;
}
}
}
-void LoopInfo::verifyAnalysis() const {
- // LoopInfo is a FunctionPass, but verifying every loop in the function
- // each time verifyAnalysis is called is very expensive. The
- // -verify-loop-info option can enable this. In order to perform some
- // checking by default, LoopPass has been taught to call verifyLoop
- // manually during loop pass sequences.
+char LoopAnalysis::PassID;
+
+LoopInfo LoopAnalysis::run(Function &F, AnalysisManager<Function> *AM) {
+ // FIXME: Currently we create a LoopInfo from scratch for every function.
+ // This may prove to be too wasteful due to deallocating and re-allocating
+ // memory each time for the underlying map and vector datastructures. At some
+ // point it may prove worthwhile to use a freelist and recycle LoopInfo
+ // objects. I don't want to add that kind of complexity until the scope of
+ // the problem is better understood.
+ LoopInfo LI;
+ LI.analyze(AM->getResult<DominatorTreeAnalysis>(F));
+ return LI;
+}
+
+PreservedAnalyses LoopPrinterPass::run(Function &F,
+ AnalysisManager<Function> *AM) {
+ AM->getResult<LoopAnalysis>(F).print(OS);
+ return PreservedAnalyses::all();
+}
- if (!VerifyLoopInfo) return;
+PrintLoopPass::PrintLoopPass() : OS(dbgs()) {}
+PrintLoopPass::PrintLoopPass(raw_ostream &OS, const std::string &Banner)
+ : OS(OS), Banner(Banner) {}
- DenseSet<const Loop*> Loops;
- for (iterator I = begin(), E = end(); I != E; ++I) {
- assert(!(*I)->getParentLoop() && "Top-level loop has a parent!");
- (*I)->verifyLoopNest(&Loops);
- }
+PreservedAnalyses PrintLoopPass::run(Loop &L) {
+ OS << Banner;
+ for (auto *Block : L.blocks())
+ if (Block)
+ Block->print(OS);
+ else
+ OS << "Printing <null> block";
+ return PreservedAnalyses::all();
+}
- // Verify that blocks are mapped to valid loops.
- for (DenseMap<BasicBlock*, Loop*>::const_iterator I = LI.BBMap.begin(),
- E = LI.BBMap.end(); I != E; ++I) {
- assert(Loops.count(I->second) && "orphaned loop");
- assert(I->second->contains(I->first) && "orphaned block");
- }
+//===----------------------------------------------------------------------===//
+// LoopInfo implementation
+//
+
+char LoopInfoWrapperPass::ID = 0;
+INITIALIZE_PASS_BEGIN(LoopInfoWrapperPass, "loops", "Natural Loop Information",
+ true, true)
+INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
+INITIALIZE_PASS_END(LoopInfoWrapperPass, "loops", "Natural Loop Information",
+ true, true)
+
+bool LoopInfoWrapperPass::runOnFunction(Function &) {
+ releaseMemory();
+ LI.analyze(getAnalysis<DominatorTreeWrapperPass>().getDomTree());
+ return false;
+}
+
+void LoopInfoWrapperPass::verifyAnalysis() const {
+ // LoopInfoWrapperPass is a FunctionPass, but verifying every loop in the
+ // function each time verifyAnalysis is called is very expensive. The
+ // -verify-loop-info option can enable this. In order to perform some
+ // checking by default, LoopPass has been taught to call verifyLoop manually
+ // during loop pass sequences.
+ if (VerifyLoopInfo)
+ LI.verify();
}
-void LoopInfo::getAnalysisUsage(AnalysisUsage &AU) const {
+void LoopInfoWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<DominatorTreeWrapperPass>();
}
-void LoopInfo::print(raw_ostream &OS, const Module*) const {
+void LoopInfoWrapperPass::print(raw_ostream &OS, const Module *) const {
LI.print(OS);
}
projects / oota-llvm.git / blobdiff