//===----------------------------------------------------------------------===//
//
// This file defines the LoopInfo class that is used to identify natural loops
-// and determine the loop depth of various nodes of the CFG. Note that natural
+// and determine the loop depth of various nodes of the CFG. A natural loop
+// has exactly one entry-point, which is called the header. Note that natural
// loops may actually be several loops that share the same header node.
//
// This analysis calculates the nesting structure of loops in a function. For
#define LLVM_ANALYSIS_LOOP_INFO_H
#include "llvm/Pass.h"
-#include "llvm/Constants.h"
-#include "llvm/Instructions.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/GraphTraits.h"
-#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/STLExtras.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Support/CFG.h"
-#include "llvm/Support/Streams.h"
+#include "llvm/Support/raw_ostream.h"
#include <algorithm>
-#include <ostream>
namespace llvm {
class DominatorTree;
class LoopInfo;
-template<class N> class LoopInfoBase;
-template<class N> class LoopBase;
-
-typedef LoopBase<BasicBlock> Loop;
+class Loop;
+template<class N, class M> class LoopInfoBase;
+template<class N, class M> class LoopBase;
//===----------------------------------------------------------------------===//
/// LoopBase class - Instances of this class are used to represent loops that
/// are detected in the flow graph
///
-template<class BlockT>
+template<class BlockT, class LoopT>
class LoopBase {
- LoopBase<BlockT> *ParentLoop;
+ LoopT *ParentLoop;
// SubLoops - Loops contained entirely within this one.
- std::vector<LoopBase<BlockT>*> SubLoops;
+ std::vector<LoopT *> SubLoops;
// Blocks - The list of blocks in this loop. First entry is the header node.
std::vector<BlockT*> Blocks;
- LoopBase(const LoopBase<BlockT> &); // DO NOT IMPLEMENT
- const LoopBase<BlockT>&operator=(const LoopBase<BlockT> &);// DO NOT IMPLEMENT
+ // DO NOT IMPLEMENT
+ LoopBase(const LoopBase<BlockT, LoopT> &);
+ // DO NOT IMPLEMENT
+ const LoopBase<BlockT, LoopT>&operator=(const LoopBase<BlockT, LoopT> &);
public:
/// Loop ctor - This creates an empty loop.
LoopBase() : ParentLoop(0) {}
/// blocks, where depth 0 is used for blocks not inside any loops.
unsigned getLoopDepth() const {
unsigned D = 1;
- for (const LoopBase<BlockT> *CurLoop = ParentLoop; CurLoop;
+ for (const LoopT *CurLoop = ParentLoop; CurLoop;
CurLoop = CurLoop->ParentLoop)
++D;
return D;
}
BlockT *getHeader() const { return Blocks.front(); }
- LoopBase<BlockT> *getParentLoop() const { return ParentLoop; }
+ LoopT *getParentLoop() const { return ParentLoop; }
- /// contains - Return true if the specified basic block is in this loop
+ /// contains - Return true if the specified loop is contained within in
+ /// this loop.
+ ///
+ bool contains(const LoopT *L) const {
+ if (L == this) return true;
+ if (L == 0) return false;
+ return contains(L->getParentLoop());
+ }
+
+ /// contains - Return true if the specified basic block is in this loop.
///
bool contains(const BlockT *BB) const {
return std::find(block_begin(), block_end(), BB) != block_end();
}
+ /// contains - Return true if the specified instruction is in this loop.
+ ///
+ template<class InstT>
+ bool contains(const InstT *Inst) const {
+ return contains(Inst->getParent());
+ }
+
/// iterator/begin/end - Return the loops contained entirely within this loop.
///
- const std::vector<LoopBase<BlockT>*> &getSubLoops() const { return SubLoops; }
- typedef typename std::vector<LoopBase<BlockT>*>::const_iterator iterator;
+ const std::vector<LoopT *> &getSubLoops() const { return SubLoops; }
+ typedef typename std::vector<LoopT *>::const_iterator iterator;
iterator begin() const { return SubLoops.begin(); }
iterator end() const { return SubLoops.end(); }
bool empty() const { return SubLoops.empty(); }
block_iterator block_begin() const { return Blocks.begin(); }
block_iterator block_end() const { return Blocks.end(); }
- /// isLoopExit - True if terminator in the block can branch to another block
- /// that is outside of the current loop.
+ /// isLoopExiting - True if terminator in the block can branch to another
+ /// block that is outside of the current loop.
///
- bool isLoopExit(const BlockT *BB) const {
+ bool isLoopExiting(const BlockT *BB) const {
typedef GraphTraits<BlockT*> BlockTraits;
for (typename BlockTraits::ChildIteratorType SI =
BlockTraits::child_begin(const_cast<BlockT*>(BB)),
return NumBackEdges;
}
- /// isLoopInvariant - Return true if the specified value is loop invariant
- ///
- inline bool isLoopInvariant(Value *V) const {
- if (Instruction *I = dyn_cast<Instruction>(V))
- return !contains(I->getParent());
- return true; // All non-instructions are loop invariant
- }
-
//===--------------------------------------------------------------------===//
// APIs for simple analysis of the loop.
//
return 0;
}
- /// getUniqueExitBlocks - Return all unique successor blocks of this loop.
- /// These are the blocks _outside of the current loop_ which are branched to.
- /// This assumes that loop is in canonical form.
- ///
- void getUniqueExitBlocks(SmallVectorImpl<BlockT*> &ExitBlocks) const {
+ /// Edge type.
+ typedef std::pair<BlockT*, BlockT*> Edge;
+
+ /// getExitEdges - Return all pairs of (_inside_block_,_outside_block_).
+ template <typename EdgeT>
+ void getExitEdges(SmallVectorImpl<EdgeT> &ExitEdges) const {
// Sort the blocks vector so that we can use binary search to do quick
// lookups.
SmallVector<BlockT*, 128> LoopBBs(block_begin(), block_end());
- std::sort(LoopBBs.begin(), LoopBBs.end());
-
- std::vector<BlockT*> switchExitBlocks;
-
- for (block_iterator BI = block_begin(), BE = block_end(); BI != BE; ++BI) {
-
- BlockT *current = *BI;
- switchExitBlocks.clear();
+ array_pod_sort(LoopBBs.begin(), LoopBBs.end());
- typedef GraphTraits<BlockT*> BlockTraits;
- typedef GraphTraits<Inverse<BlockT*> > InvBlockTraits;
+ typedef GraphTraits<BlockT*> BlockTraits;
+ for (block_iterator BI = block_begin(), BE = block_end(); BI != BE; ++BI)
for (typename BlockTraits::ChildIteratorType I =
BlockTraits::child_begin(*BI), E = BlockTraits::child_end(*BI);
- I != E; ++I) {
- if (std::binary_search(LoopBBs.begin(), LoopBBs.end(), *I))
- // If block is inside the loop then it is not a exit block.
- continue;
-
- typename InvBlockTraits::ChildIteratorType PI =
- InvBlockTraits::child_begin(*I);
- BlockT *firstPred = *PI;
-
- // If current basic block is this exit block's first predecessor
- // then only insert exit block in to the output ExitBlocks vector.
- // This ensures that same exit block is not inserted twice into
- // ExitBlocks vector.
- if (current != firstPred)
- continue;
-
- // If a terminator has more then two successors, for example SwitchInst,
- // then it is possible that there are multiple edges from current block
- // to one exit block.
- if (std::distance(BlockTraits::child_begin(current),
- BlockTraits::child_end(current)) <= 2) {
- ExitBlocks.push_back(*I);
- continue;
- }
-
- // In case of multiple edges from current block to exit block, collect
- // only one edge in ExitBlocks. Use switchExitBlocks to keep track of
- // duplicate edges.
- if (std::find(switchExitBlocks.begin(), switchExitBlocks.end(), *I)
- == switchExitBlocks.end()) {
- switchExitBlocks.push_back(*I);
- ExitBlocks.push_back(*I);
- }
- }
- }
+ I != E; ++I)
+ if (!std::binary_search(LoopBBs.begin(), LoopBBs.end(), *I))
+ // Not in current loop? It must be an exit block.
+ ExitEdges.push_back(EdgeT(*BI, *I));
}
/// getLoopPreheader - If there is a preheader for this loop, return it. A
/// This method returns null if there is no preheader for the loop.
///
BlockT *getLoopPreheader() const {
+ // Keep track of nodes outside the loop branching to the header...
+ BlockT *Out = getLoopPredecessor();
+ if (!Out) return 0;
+
+ // Make sure there is only one exit out of the preheader.
+ typedef GraphTraits<BlockT*> BlockTraits;
+ typename BlockTraits::ChildIteratorType SI = BlockTraits::child_begin(Out);
+ ++SI;
+ if (SI != BlockTraits::child_end(Out))
+ return 0; // Multiple exits from the block, must not be a preheader.
+
+ // The predecessor has exactly one successor, so it is a preheader.
+ return Out;
+ }
+
+ /// getLoopPredecessor - If the given loop's header has exactly one unique
+ /// predecessor outside the loop, return it. Otherwise return null.
+ /// This is less strict that the loop "preheader" concept, which requires
+ /// the predecessor to have exactly one successor.
+ ///
+ BlockT *getLoopPredecessor() const {
// Keep track of nodes outside the loop branching to the header...
BlockT *Out = 0;
typedef GraphTraits<Inverse<BlockT*> > InvBlockTraits;
for (typename InvBlockTraits::ChildIteratorType PI =
InvBlockTraits::child_begin(Header),
- PE = InvBlockTraits::child_end(Header); PI != PE; ++PI)
- if (!contains(*PI)) { // If the block is not in the loop...
- if (Out && Out != *PI)
+ PE = InvBlockTraits::child_end(Header); PI != PE; ++PI) {
+ typename InvBlockTraits::NodeType *N = *PI;
+ if (!contains(N)) { // If the block is not in the loop...
+ if (Out && Out != N)
return 0; // Multiple predecessors outside the loop
- Out = *PI;
+ Out = N;
}
+ }
// Make sure there is only one exit out of the preheader.
assert(Out && "Header of loop has no predecessors from outside loop?");
- typename BlockTraits::ChildIteratorType SI = BlockTraits::child_begin(Out);
- ++SI;
- if (SI != BlockTraits::child_end(Out))
- return 0; // Multiple exits from the block, must not be a preheader.
-
- // If there is exactly one preheader, return it. If there was zero, then
- // Out is still null.
return Out;
}
/// getLoopLatch - If there is a single latch block for this loop, return it.
/// A latch block is a block that contains a branch back to the header.
- /// A loop header in normal form has two edges into it: one from a preheader
- /// and one from a latch block.
BlockT *getLoopLatch() const {
BlockT *Header = getHeader();
typedef GraphTraits<Inverse<BlockT*> > InvBlockTraits;
InvBlockTraits::child_begin(Header);
typename InvBlockTraits::ChildIteratorType PE =
InvBlockTraits::child_end(Header);
- if (PI == PE) return 0; // no preds?
-
BlockT *Latch = 0;
- if (contains(*PI))
- Latch = *PI;
- ++PI;
- if (PI == PE) return 0; // only one pred?
-
- if (contains(*PI)) {
- if (Latch) return 0; // multiple backedges
- Latch = *PI;
- }
- ++PI;
- if (PI != PE) return 0; // more than two preds
-
- return Latch;
- }
-
- /// getCanonicalInductionVariable - Check to see if the loop has a canonical
- /// induction variable: an integer recurrence that starts at 0 and increments
- /// by one each time through the loop. If so, return the phi node that
- /// corresponds to it.
- ///
- inline PHINode *getCanonicalInductionVariable() const {
- BlockT *H = getHeader();
-
- BlockT *Incoming = 0, *Backedge = 0;
- typedef GraphTraits<Inverse<BlockT*> > InvBlockTraits;
- typename InvBlockTraits::ChildIteratorType PI =
- InvBlockTraits::child_begin(H);
- assert(PI != InvBlockTraits::child_end(H) &&
- "Loop must have at least one backedge!");
- Backedge = *PI++;
- if (PI == InvBlockTraits::child_end(H)) return 0; // dead loop
- Incoming = *PI++;
- if (PI != InvBlockTraits::child_end(H)) return 0; // multiple backedges?
-
- if (contains(Incoming)) {
- if (contains(Backedge))
- return 0;
- std::swap(Incoming, Backedge);
- } else if (!contains(Backedge))
- return 0;
-
- // Loop over all of the PHI nodes, looking for a canonical indvar.
- for (typename BlockT::iterator I = H->begin(); isa<PHINode>(I); ++I) {
- PHINode *PN = cast<PHINode>(I);
- if (ConstantInt *CI =
- dyn_cast<ConstantInt>(PN->getIncomingValueForBlock(Incoming)))
- if (CI->isNullValue())
- if (Instruction *Inc =
- dyn_cast<Instruction>(PN->getIncomingValueForBlock(Backedge)))
- if (Inc->getOpcode() == Instruction::Add &&
- Inc->getOperand(0) == PN)
- if (ConstantInt *CI = dyn_cast<ConstantInt>(Inc->getOperand(1)))
- if (CI->equalsInt(1))
- return PN;
- }
- return 0;
- }
-
- /// getCanonicalInductionVariableIncrement - Return the LLVM value that holds
- /// the canonical induction variable value for the "next" iteration of the
- /// loop. This always succeeds if getCanonicalInductionVariable succeeds.
- ///
- inline Instruction *getCanonicalInductionVariableIncrement() const {
- if (PHINode *PN = getCanonicalInductionVariable()) {
- bool P1InLoop = contains(PN->getIncomingBlock(1));
- return cast<Instruction>(PN->getIncomingValue(P1InLoop));
- }
- return 0;
- }
-
- /// getTripCount - Return a loop-invariant LLVM value indicating the number of
- /// times the loop will be executed. Note that this means that the backedge
- /// of the loop executes N-1 times. If the trip-count cannot be determined,
- /// this returns null.
- ///
- inline Value *getTripCount() const {
- // Canonical loops will end with a 'cmp ne I, V', where I is the incremented
- // canonical induction variable and V is the trip count of the loop.
- Instruction *Inc = getCanonicalInductionVariableIncrement();
- if (Inc == 0) return 0;
- PHINode *IV = cast<PHINode>(Inc->getOperand(0));
-
- BlockT *BackedgeBlock =
- IV->getIncomingBlock(contains(IV->getIncomingBlock(1)));
-
- if (BranchInst *BI = dyn_cast<BranchInst>(BackedgeBlock->getTerminator()))
- if (BI->isConditional()) {
- if (ICmpInst *ICI = dyn_cast<ICmpInst>(BI->getCondition())) {
- if (ICI->getOperand(0) == Inc) {
- if (BI->getSuccessor(0) == getHeader()) {
- if (ICI->getPredicate() == ICmpInst::ICMP_NE)
- return ICI->getOperand(1);
- } else if (ICI->getPredicate() == ICmpInst::ICMP_EQ) {
- return ICI->getOperand(1);
- }
- }
- }
- }
-
- return 0;
- }
-
- /// getSmallConstantTripCount - Returns the trip count of this loop as a
- /// normal unsigned value, if possible. Returns 0 if the trip count is unknown
- /// of not constant. Will also return 0 if the trip count is very large
- /// (>= 2^32)
- inline unsigned getSmallConstantTripCount() const {
- Value* TripCount = this->getTripCount();
- if (TripCount) {
- if (ConstantInt *TripCountC = dyn_cast<ConstantInt>(TripCount)) {
- // Guard against huge trip counts.
- if (TripCountC->getValue().getActiveBits() <= 32) {
- return (unsigned)TripCountC->getZExtValue();
- }
+ for (; PI != PE; ++PI) {
+ typename InvBlockTraits::NodeType *N = *PI;
+ if (contains(N)) {
+ if (Latch) return 0;
+ Latch = N;
}
}
- return 0;
- }
- /// getSmallConstantTripMultiple - Returns the largest constant divisor of the
- /// trip count of this loop as a normal unsigned value, if possible. This
- /// means that the actual trip count is always a multiple of the returned
- /// value (don't forget the trip count could very well be zero as well!).
- ///
- /// Returns 1 if the trip count is unknown or not guaranteed to be the
- /// multiple of a constant (which is also the case if the trip count is simply
- /// constant, use getSmallConstantTripCount for that case), Will also return 1
- /// if the trip count is very large (>= 2^32).
- inline unsigned getSmallConstantTripMultiple() const {
- Value* TripCount = this->getTripCount();
- // This will hold the ConstantInt result, if any
- ConstantInt *Result = NULL;
- if (TripCount) {
- // See if the trip count is constant itself
- Result = dyn_cast<ConstantInt>(TripCount);
- // if not, see if it is a multiplication
- if (!Result)
- if (BinaryOperator *BO = dyn_cast<BinaryOperator>(TripCount)) {
- switch (BO->getOpcode()) {
- case BinaryOperator::Mul:
- Result = dyn_cast<ConstantInt>(BO->getOperand(1));
- break;
- default:
- break;
- }
- }
- }
- // Guard against huge trip counts.
- if (Result && Result->getValue().getActiveBits() <= 32) {
- return (unsigned)Result->getZExtValue();
- } else {
- return 1;
- }
- }
-
- /// isLCSSAForm - Return true if the Loop is in LCSSA form
- inline bool isLCSSAForm() const {
- // Sort the blocks vector so that we can use binary search to do quick
- // lookups.
- SmallPtrSet<BlockT*, 16> LoopBBs(block_begin(), block_end());
-
- for (block_iterator BI = block_begin(), E = block_end(); BI != E; ++BI) {
- BlockT *BB = *BI;
- for (typename BlockT::iterator I = BB->begin(), E = BB->end(); I != E;++I)
- for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E;
- ++UI) {
- BlockT *UserBB = cast<Instruction>(*UI)->getParent();
- if (PHINode *P = dyn_cast<PHINode>(*UI)) {
- UserBB = P->getIncomingBlock(UI);
- }
-
- // Check the current block, as a fast-path. Most values are used in
- // the same block they are defined in.
- if (UserBB != BB && !LoopBBs.count(UserBB))
- return false;
- }
- }
-
- return true;
+ return Latch;
}
//===--------------------------------------------------------------------===//
/// to the specified LoopInfo object as being in the current basic block. It
/// is not valid to replace the loop header with this method.
///
- void addBasicBlockToLoop(BlockT *NewBB, LoopInfoBase<BlockT> &LI);
+ void addBasicBlockToLoop(BlockT *NewBB, LoopInfoBase<BlockT, LoopT> &LI);
/// replaceChildLoopWith - This is used when splitting loops up. It replaces
/// the OldChild entry in our children list with NewChild, and updates the
/// parent pointer of OldChild to be null and the NewChild to be this loop.
/// This updates the loop depth of the new child.
- void replaceChildLoopWith(LoopBase<BlockT> *OldChild,
- LoopBase<BlockT> *NewChild) {
+ void replaceChildLoopWith(LoopT *OldChild,
+ LoopT *NewChild) {
assert(OldChild->ParentLoop == this && "This loop is already broken!");
assert(NewChild->ParentLoop == 0 && "NewChild already has a parent!");
- typename std::vector<LoopBase<BlockT>*>::iterator I =
+ typename std::vector<LoopT *>::iterator I =
std::find(SubLoops.begin(), SubLoops.end(), OldChild);
assert(I != SubLoops.end() && "OldChild not in loop!");
*I = NewChild;
OldChild->ParentLoop = 0;
- NewChild->ParentLoop = this;
+ NewChild->ParentLoop = static_cast<LoopT *>(this);
}
/// addChildLoop - Add the specified loop to be a child of this loop. This
/// updates the loop depth of the new child.
///
- void addChildLoop(LoopBase<BlockT> *NewChild) {
+ void addChildLoop(LoopT *NewChild) {
assert(NewChild->ParentLoop == 0 && "NewChild already has a parent!");
- NewChild->ParentLoop = this;
+ NewChild->ParentLoop = static_cast<LoopT *>(this);
SubLoops.push_back(NewChild);
}
/// removeChildLoop - This removes the specified child from being a subloop of
/// this loop. The loop is not deleted, as it will presumably be inserted
/// into another loop.
- LoopBase<BlockT> *removeChildLoop(iterator I) {
+ LoopT *removeChildLoop(iterator I) {
assert(I != SubLoops.end() && "Cannot remove end iterator!");
- LoopBase<BlockT> *Child = *I;
+ LoopT *Child = *I;
assert(Child->ParentLoop == this && "Child is not a child of this loop!");
SubLoops.erase(SubLoops.begin()+(I-begin()));
Child->ParentLoop = 0;
/// verifyLoop - Verify loop structure
void verifyLoop() const {
#ifndef NDEBUG
- assert (getHeader() && "Loop header is missing");
- assert (getLoopPreheader() && "Loop preheader is missing");
- assert (getLoopLatch() && "Loop latch is missing");
- for (iterator I = SubLoops.begin(), E = SubLoops.end(); I != E; ++I)
- (*I)->verifyLoop();
+ assert(!Blocks.empty() && "Loop header is missing");
+
+ // Sort the blocks vector so that we can use binary search to do quick
+ // lookups.
+ SmallVector<BlockT*, 128> LoopBBs(block_begin(), block_end());
+ std::sort(LoopBBs.begin(), LoopBBs.end());
+
+ // Check the individual blocks.
+ for (block_iterator I = block_begin(), E = block_end(); I != E; ++I) {
+ BlockT *BB = *I;
+ bool HasInsideLoopSuccs = false;
+ bool HasInsideLoopPreds = false;
+ SmallVector<BlockT *, 2> OutsideLoopPreds;
+
+ typedef GraphTraits<BlockT*> BlockTraits;
+ for (typename BlockTraits::ChildIteratorType SI =
+ BlockTraits::child_begin(BB), SE = BlockTraits::child_end(BB);
+ SI != SE; ++SI)
+ if (std::binary_search(LoopBBs.begin(), LoopBBs.end(), *SI)) {
+ HasInsideLoopSuccs = true;
+ break;
+ }
+ typedef GraphTraits<Inverse<BlockT*> > InvBlockTraits;
+ for (typename InvBlockTraits::ChildIteratorType PI =
+ InvBlockTraits::child_begin(BB), PE = InvBlockTraits::child_end(BB);
+ PI != PE; ++PI) {
+ typename InvBlockTraits::NodeType *N = *PI;
+ if (std::binary_search(LoopBBs.begin(), LoopBBs.end(), N))
+ HasInsideLoopPreds = true;
+ else
+ OutsideLoopPreds.push_back(N);
+ }
+
+ if (BB == getHeader()) {
+ assert(!OutsideLoopPreds.empty() && "Loop is unreachable!");
+ } else if (!OutsideLoopPreds.empty()) {
+ // A non-header loop shouldn't be reachable from outside the loop,
+ // though it is permitted if the predecessor is not itself actually
+ // reachable.
+ BlockT *EntryBB = BB->getParent()->begin();
+ for (df_iterator<BlockT *> NI = df_begin(EntryBB),
+ NE = df_end(EntryBB); NI != NE; ++NI)
+ for (unsigned i = 0, e = OutsideLoopPreds.size(); i != e; ++i)
+ assert(*NI != OutsideLoopPreds[i] &&
+ "Loop has multiple entry points!");
+ }
+ assert(HasInsideLoopPreds && "Loop block has no in-loop predecessors!");
+ assert(HasInsideLoopSuccs && "Loop block has no in-loop successors!");
+ assert(BB != getHeader()->getParent()->begin() &&
+ "Loop contains function entry block!");
+ }
+
+ // Check the subloops.
+ for (iterator I = begin(), E = end(); I != E; ++I)
+ // Each block in each subloop should be contained within this loop.
+ for (block_iterator BI = (*I)->block_begin(), BE = (*I)->block_end();
+ BI != BE; ++BI) {
+ assert(std::binary_search(LoopBBs.begin(), LoopBBs.end(), *BI) &&
+ "Loop does not contain all the blocks of a subloop!");
+ }
+
+ // Check the parent loop pointer.
+ if (ParentLoop) {
+ assert(std::find(ParentLoop->begin(), ParentLoop->end(), this) !=
+ ParentLoop->end() &&
+ "Loop is not a subloop of its parent!");
+ }
#endif
}
- void print(std::ostream &OS, unsigned Depth = 0) const {
- OS << std::string(Depth*2, ' ') << "Loop at depth " << getLoopDepth()
+ /// verifyLoop - Verify loop structure of this loop and all nested loops.
+ void verifyLoopNest() const {
+ // Verify this loop.
+ verifyLoop();
+ // Verify the subloops.
+ for (iterator I = begin(), E = end(); I != E; ++I)
+ (*I)->verifyLoopNest();
+ }
+
+ void print(raw_ostream &OS, unsigned Depth = 0) const {
+ OS.indent(Depth*2) << "Loop at depth " << getLoopDepth()
<< " containing: ";
for (unsigned i = 0; i < getBlocks().size(); ++i) {
WriteAsOperand(OS, BB, false);
if (BB == getHeader()) OS << "<header>";
if (BB == getLoopLatch()) OS << "<latch>";
- if (isLoopExit(BB)) OS << "<exit>";
+ if (isLoopExiting(BB)) OS << "<exiting>";
}
OS << "\n";
for (iterator I = begin(), E = end(); I != E; ++I)
(*I)->print(OS, Depth+2);
}
-
- void print(std::ostream *O, unsigned Depth = 0) const {
- if (O) print(*O, Depth);
- }
-
- void dump() const {
- print(cerr);
- }
-
-private:
- friend class LoopInfoBase<BlockT>;
+
+protected:
+ friend class LoopInfoBase<BlockT, LoopT>;
explicit LoopBase(BlockT *BB) : ParentLoop(0) {
Blocks.push_back(BB);
}
};
+template<class BlockT, class LoopT>
+raw_ostream& operator<<(raw_ostream &OS, const LoopBase<BlockT, LoopT> &Loop) {
+ Loop.print(OS);
+ return OS;
+}
+
+class Loop : public LoopBase<BasicBlock, Loop> {
+public:
+ Loop() {}
+
+ /// isLoopInvariant - Return true if the specified value is loop invariant
+ ///
+ bool isLoopInvariant(Value *V) const;
+
+ /// isLoopInvariant - Return true if the specified instruction is
+ /// loop-invariant.
+ ///
+ bool isLoopInvariant(Instruction *I) const;
+
+ /// makeLoopInvariant - If the given value is an instruction inside of the
+ /// loop and it can be hoisted, do so to make it trivially loop-invariant.
+ /// Return true if the value after any hoisting is loop invariant. This
+ /// function can be used as a slightly more aggressive replacement for
+ /// isLoopInvariant.
+ ///
+ /// If InsertPt is specified, it is the point to hoist instructions to.
+ /// If null, the terminator of the loop preheader is used.
+ ///
+ bool makeLoopInvariant(Value *V, bool &Changed,
+ Instruction *InsertPt = 0) const;
+
+ /// makeLoopInvariant - If the given instruction is inside of the
+ /// loop and it can be hoisted, do so to make it trivially loop-invariant.
+ /// Return true if the instruction after any hoisting is loop invariant. This
+ /// function can be used as a slightly more aggressive replacement for
+ /// isLoopInvariant.
+ ///
+ /// If InsertPt is specified, it is the point to hoist instructions to.
+ /// If null, the terminator of the loop preheader is used.
+ ///
+ bool makeLoopInvariant(Instruction *I, bool &Changed,
+ Instruction *InsertPt = 0) const;
+
+ /// getCanonicalInductionVariable - Check to see if the loop has a canonical
+ /// induction variable: an integer recurrence that starts at 0 and increments
+ /// by one each time through the loop. If so, return the phi node that
+ /// corresponds to it.
+ ///
+ /// The IndVarSimplify pass transforms loops to have a canonical induction
+ /// variable.
+ ///
+ PHINode *getCanonicalInductionVariable() const;
+
+ /// getTripCount - Return a loop-invariant LLVM value indicating the number of
+ /// times the loop will be executed. Note that this means that the backedge
+ /// of the loop executes N-1 times. If the trip-count cannot be determined,
+ /// this returns null.
+ ///
+ /// The IndVarSimplify pass transforms loops to have a form that this
+ /// function easily understands.
+ ///
+ Value *getTripCount() const;
+
+ /// getSmallConstantTripCount - Returns the trip count of this loop as a
+ /// normal unsigned value, if possible. Returns 0 if the trip count is unknown
+ /// of not constant. Will also return 0 if the trip count is very large
+ /// (>= 2^32)
+ ///
+ /// The IndVarSimplify pass transforms loops to have a form that this
+ /// function easily understands.
+ ///
+ unsigned getSmallConstantTripCount() const;
+
+ /// getSmallConstantTripMultiple - Returns the largest constant divisor of the
+ /// trip count of this loop as a normal unsigned value, if possible. This
+ /// means that the actual trip count is always a multiple of the returned
+ /// value (don't forget the trip count could very well be zero as well!).
+ ///
+ /// Returns 1 if the trip count is unknown or not guaranteed to be the
+ /// multiple of a constant (which is also the case if the trip count is simply
+ /// constant, use getSmallConstantTripCount for that case), Will also return 1
+ /// if the trip count is very large (>= 2^32).
+ unsigned getSmallConstantTripMultiple() const;
+
+ /// isLCSSAForm - Return true if the Loop is in LCSSA form
+ bool isLCSSAForm(DominatorTree &DT) const;
+
+ /// isLoopSimplifyForm - Return true if the Loop is in the form that
+ /// the LoopSimplify form transforms loops to, which is sometimes called
+ /// normal form.
+ bool isLoopSimplifyForm() const;
+
+ /// hasDedicatedExits - Return true if no exit block for the loop
+ /// has a predecessor that is outside the loop.
+ bool hasDedicatedExits() const;
+
+ /// getUniqueExitBlocks - Return all unique successor blocks of this loop.
+ /// These are the blocks _outside of the current loop_ which are branched to.
+ /// This assumes that loop exits are in canonical form.
+ ///
+ void getUniqueExitBlocks(SmallVectorImpl<BasicBlock *> &ExitBlocks) const;
+
+ /// getUniqueExitBlock - If getUniqueExitBlocks would return exactly one
+ /// block, return that block. Otherwise return null.
+ BasicBlock *getUniqueExitBlock() const;
+
+ void dump() const;
+
+private:
+ friend class LoopInfoBase<BasicBlock, Loop>;
+ explicit Loop(BasicBlock *BB) : LoopBase<BasicBlock, Loop>(BB) {}
+};
//===----------------------------------------------------------------------===//
/// LoopInfo - This class builds and contains all of the top level loop
/// structures in the specified function.
///
-template<class BlockT>
+template<class BlockT, class LoopT>
class LoopInfoBase {
// BBMap - Mapping of basic blocks to the inner most loop they occur in
- std::map<BlockT*, LoopBase<BlockT>*> BBMap;
- std::vector<LoopBase<BlockT>*> TopLevelLoops;
- friend class LoopBase<BlockT>;
-
+ std::map<BlockT *, LoopT *> BBMap;
+ std::vector<LoopT *> TopLevelLoops;
+ friend class LoopBase<BlockT, LoopT>;
+
+ void operator=(const LoopInfoBase &); // do not implement
+ LoopInfoBase(const LoopInfo &); // do not implement
public:
LoopInfoBase() { }
~LoopInfoBase() { releaseMemory(); }
void releaseMemory() {
- for (typename std::vector<LoopBase<BlockT>* >::iterator I =
+ for (typename std::vector<LoopT *>::iterator I =
TopLevelLoops.begin(), E = TopLevelLoops.end(); I != E; ++I)
delete *I; // Delete all of the loops...
/// iterator/begin/end - The interface to the top-level loops in the current
/// function.
///
- typedef typename std::vector<LoopBase<BlockT>*>::const_iterator iterator;
+ typedef typename std::vector<LoopT *>::const_iterator iterator;
iterator begin() const { return TopLevelLoops.begin(); }
iterator end() const { return TopLevelLoops.end(); }
bool empty() const { return TopLevelLoops.empty(); }
/// getLoopFor - Return the inner most loop that BB lives in. If a basic
/// block is in no loop (for example the entry node), null is returned.
///
- LoopBase<BlockT> *getLoopFor(const BlockT *BB) const {
- typename std::map<BlockT *, LoopBase<BlockT>*>::const_iterator I=
+ LoopT *getLoopFor(const BlockT *BB) const {
+ typename std::map<BlockT *, LoopT *>::const_iterator I=
BBMap.find(const_cast<BlockT*>(BB));
return I != BBMap.end() ? I->second : 0;
}
/// operator[] - same as getLoopFor...
///
- const LoopBase<BlockT> *operator[](const BlockT *BB) const {
+ const LoopT *operator[](const BlockT *BB) const {
return getLoopFor(BB);
}
/// depth of 0 means the block is not inside any loop.
///
unsigned getLoopDepth(const BlockT *BB) const {
- const LoopBase<BlockT> *L = getLoopFor(BB);
+ const LoopT *L = getLoopFor(BB);
return L ? L->getLoopDepth() : 0;
}
// isLoopHeader - True if the block is a loop header node
bool isLoopHeader(BlockT *BB) const {
- const LoopBase<BlockT> *L = getLoopFor(BB);
+ const LoopT *L = getLoopFor(BB);
return L && L->getHeader() == BB;
}
/// removeLoop - This removes the specified top-level loop from this loop info
/// object. The loop is not deleted, as it will presumably be inserted into
/// another loop.
- LoopBase<BlockT> *removeLoop(iterator I) {
+ LoopT *removeLoop(iterator I) {
assert(I != end() && "Cannot remove end iterator!");
- LoopBase<BlockT> *L = *I;
+ LoopT *L = *I;
assert(L->getParentLoop() == 0 && "Not a top-level loop!");
TopLevelLoops.erase(TopLevelLoops.begin() + (I-begin()));
return L;
/// changeLoopFor - Change the top-level loop that contains BB to the
/// specified loop. This should be used by transformations that restructure
/// the loop hierarchy tree.
- void changeLoopFor(BlockT *BB, LoopBase<BlockT> *L) {
- LoopBase<BlockT> *&OldLoop = BBMap[BB];
+ void changeLoopFor(BlockT *BB, LoopT *L) {
+ LoopT *&OldLoop = BBMap[BB];
assert(OldLoop && "Block not in a loop yet!");
OldLoop = L;
}
/// changeTopLevelLoop - Replace the specified loop in the top-level loops
/// list with the indicated loop.
- void changeTopLevelLoop(LoopBase<BlockT> *OldLoop,
- LoopBase<BlockT> *NewLoop) {
- typename std::vector<LoopBase<BlockT>*>::iterator I =
+ void changeTopLevelLoop(LoopT *OldLoop,
+ LoopT *NewLoop) {
+ typename std::vector<LoopT *>::iterator I =
std::find(TopLevelLoops.begin(), TopLevelLoops.end(), OldLoop);
assert(I != TopLevelLoops.end() && "Old loop not at top level!");
*I = NewLoop;
/// addTopLevelLoop - This adds the specified loop to the collection of
/// top-level loops.
- void addTopLevelLoop(LoopBase<BlockT> *New) {
+ void addTopLevelLoop(LoopT *New) {
assert(New->getParentLoop() == 0 && "Loop already in subloop!");
TopLevelLoops.push_back(New);
}
/// including all of the Loop objects it is nested in and our mapping from
/// BasicBlocks to loops.
void removeBlock(BlockT *BB) {
- typename std::map<BlockT *, LoopBase<BlockT>*>::iterator I = BBMap.find(BB);
+ typename std::map<BlockT *, LoopT *>::iterator I = BBMap.find(BB);
if (I != BBMap.end()) {
- for (LoopBase<BlockT> *L = I->second; L; L = L->getParentLoop())
+ for (LoopT *L = I->second; L; L = L->getParentLoop())
L->removeBlockFromLoop(BB);
BBMap.erase(I);
// Internals
- static bool isNotAlreadyContainedIn(const LoopBase<BlockT> *SubLoop,
- const LoopBase<BlockT> *ParentLoop) {
+ static bool isNotAlreadyContainedIn(const LoopT *SubLoop,
+ const LoopT *ParentLoop) {
if (SubLoop == 0) return true;
if (SubLoop == ParentLoop) return false;
return isNotAlreadyContainedIn(SubLoop->getParentLoop(), ParentLoop);
for (df_iterator<BlockT*> NI = df_begin(RootNode),
NE = df_end(RootNode); NI != NE; ++NI)
- if (LoopBase<BlockT> *L = ConsiderForLoop(*NI, DT))
+ if (LoopT *L = ConsiderForLoop(*NI, DT))
TopLevelLoops.push_back(L);
}
- LoopBase<BlockT> *ConsiderForLoop(BlockT *BB, DominatorTreeBase<BlockT> &DT) {
+ LoopT *ConsiderForLoop(BlockT *BB, DominatorTreeBase<BlockT> &DT) {
if (BBMap.find(BB) != BBMap.end()) return 0;// Haven't processed this node?
std::vector<BlockT *> TodoStack;
typedef GraphTraits<Inverse<BlockT*> > InvBlockTraits;
for (typename InvBlockTraits::ChildIteratorType I =
InvBlockTraits::child_begin(BB), E = InvBlockTraits::child_end(BB);
- I != E; ++I)
- if (DT.dominates(BB, *I)) // If BB dominates it's predecessor...
- TodoStack.push_back(*I);
+ I != E; ++I) {
+ typename InvBlockTraits::NodeType *N = *I;
+ if (DT.dominates(BB, N)) // If BB dominates its predecessor...
+ TodoStack.push_back(N);
+ }
if (TodoStack.empty()) return 0; // No backedges to this block...
// Create a new loop to represent this basic block...
- LoopBase<BlockT> *L = new LoopBase<BlockT>(BB);
+ LoopT *L = new LoopT(BB);
BBMap[BB] = L;
BlockT *EntryBlock = BB->getParent()->begin();
// occurs, this child loop gets added to a part of the current loop,
// making it a sibling to the current loop. We have to reparent this
// loop.
- if (LoopBase<BlockT> *SubLoop =
- const_cast<LoopBase<BlockT>*>(getLoopFor(X)))
+ if (LoopT *SubLoop =
+ const_cast<LoopT *>(getLoopFor(X)))
if (SubLoop->getHeader() == X && isNotAlreadyContainedIn(SubLoop, L)){
- // Remove the subloop from it's current parent...
+ // Remove the subloop from its current parent...
assert(SubLoop->ParentLoop && SubLoop->ParentLoop != L);
- LoopBase<BlockT> *SLP = SubLoop->ParentLoop; // SubLoopParent
- typename std::vector<LoopBase<BlockT>*>::iterator I =
+ LoopT *SLP = SubLoop->ParentLoop; // SubLoopParent
+ typename std::vector<LoopT *>::iterator I =
std::find(SLP->SubLoops.begin(), SLP->SubLoops.end(), SubLoop);
assert(I != SLP->SubLoops.end() &&"SubLoop not a child of parent?");
SLP->SubLoops.erase(I); // Remove from parent...
// If there are any loops nested within this loop, create them now!
for (typename std::vector<BlockT*>::iterator I = L->Blocks.begin(),
E = L->Blocks.end(); I != E; ++I)
- if (LoopBase<BlockT> *NewLoop = ConsiderForLoop(*I, DT)) {
+ if (LoopT *NewLoop = ConsiderForLoop(*I, DT)) {
L->SubLoops.push_back(NewLoop);
NewLoop->ParentLoop = L;
}
// loop can be found for them.
//
for (typename std::vector<BlockT*>::iterator I = L->Blocks.begin(),
- E = L->Blocks.end(); I != E; ++I) {
- typename std::map<BlockT*, LoopBase<BlockT>*>::iterator BBMI =
- BBMap.find(*I);
- if (BBMI == BBMap.end()) // Not in map yet...
- BBMap.insert(BBMI, std::make_pair(*I, L)); // Must be at this level
- }
+ E = L->Blocks.end(); I != E; ++I)
+ BBMap.insert(std::make_pair(*I, L));
// Now that we have a list of all of the child loops of this loop, check to
// see if any of them should actually be nested inside of each other. We
// can accidentally pull loops our of their parents, so we must make sure to
// organize the loop nests correctly now.
{
- std::map<BlockT*, LoopBase<BlockT>*> ContainingLoops;
+ std::map<BlockT *, LoopT *> ContainingLoops;
for (unsigned i = 0; i != L->SubLoops.size(); ++i) {
- LoopBase<BlockT> *Child = L->SubLoops[i];
+ LoopT *Child = L->SubLoops[i];
assert(Child->getParentLoop() == L && "Not proper child loop?");
- if (LoopBase<BlockT> *ContainingLoop =
- ContainingLoops[Child->getHeader()]) {
+ if (LoopT *ContainingLoop = ContainingLoops[Child->getHeader()]) {
// If there is already a loop which contains this loop, move this loop
// into the containing loop.
MoveSiblingLoopInto(Child, ContainingLoop);
// if any of the contained blocks are loop headers for subloops we
// have already processed.
for (unsigned b = 0, e = Child->Blocks.size(); b != e; ++b) {
- LoopBase<BlockT> *&BlockLoop = ContainingLoops[Child->Blocks[b]];
+ LoopT *&BlockLoop = ContainingLoops[Child->Blocks[b]];
if (BlockLoop == 0) { // Child block not processed yet...
BlockLoop = Child;
} else if (BlockLoop != Child) {
- LoopBase<BlockT> *SubLoop = BlockLoop;
+ LoopT *SubLoop = BlockLoop;
// Reparent all of the blocks which used to belong to BlockLoops
- for (unsigned j = 0, e = SubLoop->Blocks.size(); j != e; ++j)
+ for (unsigned j = 0, f = SubLoop->Blocks.size(); j != f; ++j)
ContainingLoops[SubLoop->Blocks[j]] = Child;
// There is already a loop which contains this block, that means
/// MoveSiblingLoopInto - This method moves the NewChild loop to live inside
/// of the NewParent Loop, instead of being a sibling of it.
- void MoveSiblingLoopInto(LoopBase<BlockT> *NewChild,
- LoopBase<BlockT> *NewParent) {
- LoopBase<BlockT> *OldParent = NewChild->getParentLoop();
+ void MoveSiblingLoopInto(LoopT *NewChild,
+ LoopT *NewParent) {
+ LoopT *OldParent = NewChild->getParentLoop();
assert(OldParent && OldParent == NewParent->getParentLoop() &&
NewChild != NewParent && "Not sibling loops!");
// Remove NewChild from being a child of OldParent
- typename std::vector<LoopBase<BlockT>*>::iterator I =
+ typename std::vector<LoopT *>::iterator I =
std::find(OldParent->SubLoops.begin(), OldParent->SubLoops.end(),
NewChild);
assert(I != OldParent->SubLoops.end() && "Parent fields incorrect??");
/// InsertLoopInto - This inserts loop L into the specified parent loop. If
/// the parent loop contains a loop which should contain L, the loop gets
/// inserted into L instead.
- void InsertLoopInto(LoopBase<BlockT> *L, LoopBase<BlockT> *Parent) {
+ void InsertLoopInto(LoopT *L, LoopT *Parent) {
BlockT *LHeader = L->getHeader();
assert(Parent->contains(LHeader) &&
"This loop should not be inserted here!");
// Debugging
- void print(std::ostream &OS, const Module* ) const {
+ void print(raw_ostream &OS) const {
for (unsigned i = 0; i < TopLevelLoops.size(); ++i)
TopLevelLoops[i]->print(OS);
#if 0
- for (std::map<BasicBlock*, Loop*>::const_iterator I = BBMap.begin(),
+ for (std::map<BasicBlock*, LoopT*>::const_iterator I = BBMap.begin(),
E = BBMap.end(); I != E; ++I)
OS << "BB '" << I->first->getName() << "' level = "
<< I->second->getLoopDepth() << "\n";
};
class LoopInfo : public FunctionPass {
- LoopInfoBase<BasicBlock>* LI;
- friend class LoopBase<BasicBlock>;
-
+ LoopInfoBase<BasicBlock, Loop> LI;
+ friend class LoopBase<BasicBlock, Loop>;
+
+ void operator=(const LoopInfo &); // do not implement
+ LoopInfo(const LoopInfo &); // do not implement
public:
static char ID; // Pass identification, replacement for typeid
- LoopInfo() : FunctionPass(&ID) {
- LI = new LoopInfoBase<BasicBlock>();
- }
-
- ~LoopInfo() { delete LI; }
+ LoopInfo() : FunctionPass(ID) {}
- LoopInfoBase<BasicBlock>& getBase() { return *LI; }
+ LoopInfoBase<BasicBlock, Loop>& getBase() { return LI; }
/// iterator/begin/end - The interface to the top-level loops in the current
/// function.
///
- typedef std::vector<Loop*>::const_iterator iterator;
- inline iterator begin() const { return LI->begin(); }
- inline iterator end() const { return LI->end(); }
- bool empty() const { return LI->empty(); }
+ typedef LoopInfoBase<BasicBlock, Loop>::iterator iterator;
+ inline iterator begin() const { return LI.begin(); }
+ inline iterator end() const { return LI.end(); }
+ bool empty() const { return LI.empty(); }
/// getLoopFor - Return the inner most loop that BB lives in. If a basic
/// block is in no loop (for example the entry node), null is returned.
///
inline Loop *getLoopFor(const BasicBlock *BB) const {
- return LI->getLoopFor(BB);
+ return LI.getLoopFor(BB);
}
/// operator[] - same as getLoopFor...
///
inline const Loop *operator[](const BasicBlock *BB) const {
- return LI->getLoopFor(BB);
+ return LI.getLoopFor(BB);
}
/// getLoopDepth - Return the loop nesting level of the specified block. A
/// depth of 0 means the block is not inside any loop.
///
inline unsigned getLoopDepth(const BasicBlock *BB) const {
- return LI->getLoopDepth(BB);
+ return LI.getLoopDepth(BB);
}
// isLoopHeader - True if the block is a loop header node
inline bool isLoopHeader(BasicBlock *BB) const {
- return LI->isLoopHeader(BB);
+ return LI.isLoopHeader(BB);
}
/// runOnFunction - Calculate the natural loop information.
///
virtual bool runOnFunction(Function &F);
- virtual void releaseMemory() { LI->releaseMemory(); }
+ virtual void verifyAnalysis() const;
- virtual void print(std::ostream &O, const Module* M = 0) const {
- if (O) LI->print(O, M);
- }
+ virtual void releaseMemory() { LI.releaseMemory(); }
+ virtual void print(raw_ostream &O, const Module* M = 0) const;
+
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
/// removeLoop - This removes the specified top-level loop from this loop info
/// object. The loop is not deleted, as it will presumably be inserted into
/// another loop.
- inline Loop *removeLoop(iterator I) { return LI->removeLoop(I); }
+ inline Loop *removeLoop(iterator I) { return LI.removeLoop(I); }
/// changeLoopFor - Change the top-level loop that contains BB to the
/// specified loop. This should be used by transformations that restructure
/// the loop hierarchy tree.
inline void changeLoopFor(BasicBlock *BB, Loop *L) {
- LI->changeLoopFor(BB, L);
+ LI.changeLoopFor(BB, L);
}
/// changeTopLevelLoop - Replace the specified loop in the top-level loops
/// list with the indicated loop.
inline void changeTopLevelLoop(Loop *OldLoop, Loop *NewLoop) {
- LI->changeTopLevelLoop(OldLoop, NewLoop);
+ LI.changeTopLevelLoop(OldLoop, NewLoop);
}
/// addTopLevelLoop - This adds the specified loop to the collection of
/// top-level loops.
inline void addTopLevelLoop(Loop *New) {
- LI->addTopLevelLoop(New);
+ LI.addTopLevelLoop(New);
}
/// removeBlock - This method completely removes BB from all data structures,
/// including all of the Loop objects it is nested in and our mapping from
/// BasicBlocks to loops.
void removeBlock(BasicBlock *BB) {
- LI->removeBlock(BB);
+ LI.removeBlock(BB);
}
};
// Allow clients to walk the list of nested loops...
template <> struct GraphTraits<const Loop*> {
typedef const Loop NodeType;
- typedef std::vector<Loop*>::const_iterator ChildIteratorType;
+ typedef LoopInfo::iterator ChildIteratorType;
static NodeType *getEntryNode(const Loop *L) { return L; }
static inline ChildIteratorType child_begin(NodeType *N) {
template <> struct GraphTraits<Loop*> {
typedef Loop NodeType;
- typedef std::vector<Loop*>::const_iterator ChildIteratorType;
+ typedef LoopInfo::iterator ChildIteratorType;
static NodeType *getEntryNode(Loop *L) { return L; }
static inline ChildIteratorType child_begin(NodeType *N) {
}
};
-template<class BlockT>
-void LoopBase<BlockT>::addBasicBlockToLoop(BlockT *NewBB,
- LoopInfoBase<BlockT> &LIB) {
+template<class BlockT, class LoopT>
+void
+LoopBase<BlockT, LoopT>::addBasicBlockToLoop(BlockT *NewBB,
+ LoopInfoBase<BlockT, LoopT> &LIB) {
assert((Blocks.empty() || LIB[getHeader()] == this) &&
"Incorrect LI specified for this loop!");
assert(NewBB && "Cannot add a null basic block to the loop!");
assert(LIB[NewBB] == 0 && "BasicBlock already in the loop!");
+ LoopT *L = static_cast<LoopT *>(this);
+
// Add the loop mapping to the LoopInfo object...
- LIB.BBMap[NewBB] = this;
+ LIB.BBMap[NewBB] = L;
// Add the basic block to this loop and all parent loops...
- LoopBase<BlockT> *L = this;
while (L) {
L->Blocks.push_back(NewBB);
L = L->getParentLoop();
projects / oota-llvm.git / blobdiff