mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-17 05:29:24 +00:00
Start the process of making MachineLoopInfo possible by templating Loop.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44097 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
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@ -31,8 +31,22 @@
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#define LLVM_ANALYSIS_LOOP_INFO_H
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#include "llvm/Pass.h"
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#include "llvm/Constants.h"
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#include "llvm/Instructions.h"
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#include "llvm/ADT/GraphTraits.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/Streams.h"
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#include <algorithm>
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#include <ostream>
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template<typename T>
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static void RemoveFromVector(std::vector<T*> &V, T *N) {
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typename std::vector<T*>::iterator I = std::find(V.begin(), V.end(), N);
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assert(I != V.end() && "N is not in this list!");
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V.erase(I);
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}
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namespace llvm {
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@ -42,64 +56,88 @@ class PHINode;
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class Instruction;
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//===----------------------------------------------------------------------===//
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/// Loop class - Instances of this class are used to represent loops that are
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/// LoopBase class - Instances of this class are used to represent loops that are
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/// detected in the flow graph
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///
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class Loop {
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Loop *ParentLoop;
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std::vector<Loop*> SubLoops; // Loops contained entirely within this one
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std::vector<BasicBlock*> Blocks; // First entry is the header node
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template<class BlockT>
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class LoopBase {
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LoopBase<BlockT> *ParentLoop;
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std::vector<LoopBase<BlockT>*> SubLoops; // Loops contained entirely within this one
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std::vector<BlockT*> Blocks; // First entry is the header node
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Loop(const Loop &); // DO NOT IMPLEMENT
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const Loop &operator=(const Loop &); // DO NOT IMPLEMENT
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LoopBase(const LoopBase<BlockT> &); // DO NOT IMPLEMENT
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const LoopBase<BlockT> &operator=(const LoopBase<BlockT> &); // DO NOT IMPLEMENT
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public:
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/// Loop ctor - This creates an empty loop.
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Loop() : ParentLoop(0) {}
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~Loop() {
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LoopBase() : ParentLoop(0) {}
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~LoopBase() {
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for (unsigned i = 0, e = SubLoops.size(); i != e; ++i)
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delete SubLoops[i];
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}
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unsigned getLoopDepth() const {
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unsigned D = 0;
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for (const Loop *CurLoop = this; CurLoop; CurLoop = CurLoop->ParentLoop)
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for (const LoopBase<BlockT> *CurLoop = this; CurLoop;
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CurLoop = CurLoop->ParentLoop)
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++D;
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return D;
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}
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BasicBlock *getHeader() const { return Blocks.front(); }
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Loop *getParentLoop() const { return ParentLoop; }
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BlockT *getHeader() const { return Blocks.front(); }
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LoopBase<BlockT> *getParentLoop() const { return ParentLoop; }
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/// contains - Return true of the specified basic block is in this loop
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///
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bool contains(const BasicBlock *BB) const;
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bool contains(const BlockT *BB) const {
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return std::find(Blocks.begin(), Blocks.end(), BB) != Blocks.end();
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}
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/// iterator/begin/end - Return the loops contained entirely within this loop.
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///
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const std::vector<Loop*> &getSubLoops() const { return SubLoops; }
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typedef std::vector<Loop*>::const_iterator iterator;
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const std::vector<LoopBase<BlockT>*> &getSubLoops() const { return SubLoops; }
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typedef typename std::vector<LoopBase<BlockT>*>::const_iterator iterator;
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iterator begin() const { return SubLoops.begin(); }
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iterator end() const { return SubLoops.end(); }
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bool empty() const { return SubLoops.empty(); }
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/// getBlocks - Get a list of the basic blocks which make up this loop.
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///
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const std::vector<BasicBlock*> &getBlocks() const { return Blocks; }
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typedef std::vector<BasicBlock*>::const_iterator block_iterator;
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const std::vector<BlockT*> &getBlocks() const { return Blocks; }
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typedef typename std::vector<BlockT*>::const_iterator block_iterator;
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block_iterator block_begin() const { return Blocks.begin(); }
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block_iterator block_end() const { return Blocks.end(); }
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/// isLoopExit - True if terminator in the block can branch to another block
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/// that is outside of the current loop.
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///
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bool isLoopExit(const BasicBlock *BB) const;
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bool isLoopExit(const BlockT *BB) const {
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for (succ_const_iterator SI = succ_begin(BB), SE = succ_end(BB);
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SI != SE; ++SI) {
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if (!contains(*SI))
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return true;
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}
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return false;
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}
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/// getNumBackEdges - Calculate the number of back edges to the loop header
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///
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unsigned getNumBackEdges() const;
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unsigned getNumBackEdges() const {
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unsigned NumBackEdges = 0;
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BlockT *H = getHeader();
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for (pred_iterator I = pred_begin(H), E = pred_end(H); I != E; ++I)
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if (contains(*I))
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++NumBackEdges;
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return NumBackEdges;
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}
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/// isLoopInvariant - Return true if the specified value is loop invariant
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///
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bool isLoopInvariant(Value *V) const;
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bool isLoopInvariant(Value *V) const {
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if (Instruction *I = dyn_cast<Instruction>(V))
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return !contains(I->getParent());
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return true; // All non-instructions are loop invariant
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}
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//===--------------------------------------------------------------------===//
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// APIs for simple analysis of the loop.
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@ -113,18 +151,91 @@ public:
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/// outside of the loop. These are the blocks _inside of the current loop_
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/// which branch out. The returned list is always unique.
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///
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void getExitingBlocks(SmallVectorImpl<BasicBlock *> &Blocks) const;
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void getExitingBlocks(SmallVectorImpl<BlockT *> &ExitingBlocks) const {
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// Sort the blocks vector so that we can use binary search to do quick
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// lookups.
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SmallVector<BlockT*, 128> LoopBBs(block_begin(), block_end());
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std::sort(LoopBBs.begin(), LoopBBs.end());
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for (typename std::vector<BlockT*>::const_iterator BI = Blocks.begin(),
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BE = Blocks.end(); BI != BE; ++BI)
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for (succ_iterator I = succ_begin(*BI), E = succ_end(*BI); I != E; ++I)
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if (!std::binary_search(LoopBBs.begin(), LoopBBs.end(), *I)) {
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// Not in current loop? It must be an exit block.
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ExitingBlocks.push_back(*BI);
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break;
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}
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}
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/// getExitBlocks - Return all of the successor blocks of this loop. These
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/// are the blocks _outside of the current loop_ which are branched to.
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///
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void getExitBlocks(SmallVectorImpl<BasicBlock* > &Blocks) const;
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void getExitBlocks(SmallVectorImpl<BlockT*> &ExitBlocks) const {
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// Sort the blocks vector so that we can use binary search to do quick
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// lookups.
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SmallVector<BlockT*, 128> LoopBBs(block_begin(), block_end());
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std::sort(LoopBBs.begin(), LoopBBs.end());
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for (typename std::vector<BlockT*>::const_iterator BI = Blocks.begin(),
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BE = Blocks.end(); BI != BE; ++BI)
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for (succ_iterator I = succ_begin(*BI), E = succ_end(*BI); I != E; ++I)
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if (!std::binary_search(LoopBBs.begin(), LoopBBs.end(), *I))
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// Not in current loop? It must be an exit block.
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ExitBlocks.push_back(*I);
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}
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/// getUniqueExitBlocks - Return all unique successor blocks of this loop.
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/// These are the blocks _outside of the current loop_ which are branched to.
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/// This assumes that loop is in canonical form.
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///
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void getUniqueExitBlocks(SmallVectorImpl<BasicBlock*> &ExitBlocks) const;
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void getUniqueExitBlocks(SmallVectorImpl<BlockT*> &ExitBlocks) const {
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// Sort the blocks vector so that we can use binary search to do quick
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// lookups.
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SmallVector<BlockT*, 128> LoopBBs(block_begin(), block_end());
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std::sort(LoopBBs.begin(), LoopBBs.end());
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std::vector<BlockT*> switchExitBlocks;
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for (typename std::vector<BlockT*>::const_iterator BI = Blocks.begin(),
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BE = Blocks.end(); BI != BE; ++BI) {
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BlockT *current = *BI;
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switchExitBlocks.clear();
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for (succ_iterator I = succ_begin(*BI), E = succ_end(*BI); I != E; ++I) {
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if (std::binary_search(LoopBBs.begin(), LoopBBs.end(), *I))
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// If block is inside the loop then it is not a exit block.
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continue;
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pred_iterator PI = pred_begin(*I);
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BlockT *firstPred = *PI;
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// If current basic block is this exit block's first predecessor
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// then only insert exit block in to the output ExitBlocks vector.
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// This ensures that same exit block is not inserted twice into
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// ExitBlocks vector.
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if (current != firstPred)
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continue;
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// If a terminator has more then two successors, for example SwitchInst,
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// then it is possible that there are multiple edges from current block
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// to one exit block.
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if (current->getTerminator()->getNumSuccessors() <= 2) {
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ExitBlocks.push_back(*I);
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continue;
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}
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// In case of multiple edges from current block to exit block, collect
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// only one edge in ExitBlocks. Use switchExitBlocks to keep track of
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// duplicate edges.
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if (std::find(switchExitBlocks.begin(), switchExitBlocks.end(), *I)
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== switchExitBlocks.end()) {
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switchExitBlocks.push_back(*I);
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ExitBlocks.push_back(*I);
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}
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}
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}
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}
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/// getLoopPreheader - If there is a preheader for this loop, return it. A
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/// loop has a preheader if there is only one edge to the header of the loop
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///
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/// This method returns null if there is no preheader for the loop.
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///
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BasicBlock *getLoopPreheader() const;
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BlockT *getLoopPreheader() const {
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// Keep track of nodes outside the loop branching to the header...
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BlockT *Out = 0;
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// Loop over the predecessors of the header node...
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BlockT *Header = getHeader();
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for (pred_iterator PI = pred_begin(Header), PE = pred_end(Header);
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PI != PE; ++PI)
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if (!contains(*PI)) { // If the block is not in the loop...
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if (Out && Out != *PI)
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return 0; // Multiple predecessors outside the loop
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Out = *PI;
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}
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// Make sure there is only one exit out of the preheader.
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assert(Out && "Header of loop has no predecessors from outside loop?");
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succ_iterator SI = succ_begin(Out);
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++SI;
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if (SI != succ_end(Out))
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return 0; // Multiple exits from the block, must not be a preheader.
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// If there is exactly one preheader, return it. If there was zero, then Out
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// is still null.
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return Out;
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}
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/// getLoopLatch - If there is a latch block for this loop, return it. A
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/// latch block is the canonical backedge for a loop. A loop header in normal
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/// form has two edges into it: one from a preheader and one from a latch
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/// block.
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BasicBlock *getLoopLatch() const;
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BlockT *getLoopLatch() const {
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BlockT *Header = getHeader();
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pred_iterator PI = pred_begin(Header), PE = pred_end(Header);
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if (PI == PE) return 0; // no preds?
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BlockT *Latch = 0;
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if (contains(*PI))
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Latch = *PI;
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++PI;
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if (PI == PE) return 0; // only one pred?
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if (contains(*PI)) {
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if (Latch) return 0; // multiple backedges
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Latch = *PI;
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}
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++PI;
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if (PI != PE) return 0; // more than two preds
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return Latch;
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}
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/// getCanonicalInductionVariable - Check to see if the loop has a canonical
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/// induction variable: an integer recurrence that starts at 0 and increments
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/// by one each time through the loop. If so, return the phi node that
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/// corresponds to it.
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///
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PHINode *getCanonicalInductionVariable() const;
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PHINode *getCanonicalInductionVariable() const {
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BlockT *H = getHeader();
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BlockT *Incoming = 0, *Backedge = 0;
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pred_iterator PI = pred_begin(H);
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assert(PI != pred_end(H) && "Loop must have at least one backedge!");
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Backedge = *PI++;
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if (PI == pred_end(H)) return 0; // dead loop
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Incoming = *PI++;
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if (PI != pred_end(H)) return 0; // multiple backedges?
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if (contains(Incoming)) {
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if (contains(Backedge))
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return 0;
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std::swap(Incoming, Backedge);
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} else if (!contains(Backedge))
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return 0;
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// Loop over all of the PHI nodes, looking for a canonical indvar.
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for (typename BlockT::iterator I = H->begin(); isa<PHINode>(I); ++I) {
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PHINode *PN = cast<PHINode>(I);
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if (Instruction *Inc =
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dyn_cast<Instruction>(PN->getIncomingValueForBlock(Backedge)))
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if (Inc->getOpcode() == Instruction::Add && Inc->getOperand(0) == PN)
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if (ConstantInt *CI = dyn_cast<ConstantInt>(Inc->getOperand(1)))
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if (CI->equalsInt(1))
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return PN;
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}
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return 0;
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}
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/// getCanonicalInductionVariableIncrement - Return the LLVM value that holds
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/// the canonical induction variable value for the "next" iteration of the
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/// loop. This always succeeds if getCanonicalInductionVariable succeeds.
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///
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Instruction *getCanonicalInductionVariableIncrement() const;
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Instruction *getCanonicalInductionVariableIncrement() const {
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if (PHINode *PN = getCanonicalInductionVariable()) {
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bool P1InLoop = contains(PN->getIncomingBlock(1));
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return cast<Instruction>(PN->getIncomingValue(P1InLoop));
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}
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return 0;
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}
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/// getTripCount - Return a loop-invariant LLVM value indicating the number of
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/// times the loop will be executed. Note that this means that the backedge
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/// of the loop executes N-1 times. If the trip-count cannot be determined,
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/// this returns null.
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///
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Value *getTripCount() const;
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Value *getTripCount() const {
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// Canonical loops will end with a 'cmp ne I, V', where I is the incremented
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// canonical induction variable and V is the trip count of the loop.
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Instruction *Inc = getCanonicalInductionVariableIncrement();
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if (Inc == 0) return 0;
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PHINode *IV = cast<PHINode>(Inc->getOperand(0));
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BlockT *BackedgeBlock =
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IV->getIncomingBlock(contains(IV->getIncomingBlock(1)));
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if (BranchInst *BI = dyn_cast<BranchInst>(BackedgeBlock->getTerminator()))
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if (BI->isConditional()) {
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if (ICmpInst *ICI = dyn_cast<ICmpInst>(BI->getCondition())) {
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if (ICI->getOperand(0) == Inc)
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if (BI->getSuccessor(0) == getHeader()) {
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if (ICI->getPredicate() == ICmpInst::ICMP_NE)
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return ICI->getOperand(1);
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} else if (ICI->getPredicate() == ICmpInst::ICMP_EQ) {
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return ICI->getOperand(1);
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}
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}
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}
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return 0;
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}
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/// isLCSSAForm - Return true if the Loop is in LCSSA form
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bool isLCSSAForm() const;
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bool isLCSSAForm() const {
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// Sort the blocks vector so that we can use binary search to do quick
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// lookups.
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SmallPtrSet<BlockT*, 16> LoopBBs(block_begin(), block_end());
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for (block_iterator BI = block_begin(), E = block_end(); BI != E; ++BI) {
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BlockT *BB = *BI;
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for (typename BlockT::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
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for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E;
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++UI) {
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BlockT *UserBB = cast<Instruction>(*UI)->getParent();
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if (PHINode *P = dyn_cast<PHINode>(*UI)) {
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unsigned OperandNo = UI.getOperandNo();
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UserBB = P->getIncomingBlock(OperandNo/2);
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}
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// Check the current block, as a fast-path. Most values are used in the
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// same block they are defined in.
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if (UserBB != BB && !LoopBBs.count(UserBB))
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return false;
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}
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}
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return true;
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}
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//===--------------------------------------------------------------------===//
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// APIs for updating loop information after changing the CFG
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@ -174,35 +411,56 @@ public:
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/// to the specified LoopInfo object as being in the current basic block. It
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/// is not valid to replace the loop header with this method.
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///
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void addBasicBlockToLoop(BasicBlock *NewBB, LoopInfo &LI);
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void addBasicBlockToLoop(BlockT *NewBB, LoopInfo &LI);
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/// replaceChildLoopWith - This is used when splitting loops up. It replaces
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/// the OldChild entry in our children list with NewChild, and updates the
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/// parent pointer of OldChild to be null and the NewChild to be this loop.
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/// This updates the loop depth of the new child.
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void replaceChildLoopWith(Loop *OldChild, Loop *NewChild);
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void replaceChildLoopWith(LoopBase<BlockT> *OldChild,
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LoopBase<BlockT> *NewChild) {
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assert(OldChild->ParentLoop == this && "This loop is already broken!");
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assert(NewChild->ParentLoop == 0 && "NewChild already has a parent!");
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typename std::vector<LoopBase<BlockT>*>::iterator I =
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std::find(SubLoops.begin(), SubLoops.end(), OldChild);
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assert(I != SubLoops.end() && "OldChild not in loop!");
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*I = NewChild;
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OldChild->ParentLoop = 0;
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NewChild->ParentLoop = this;
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}
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/// addChildLoop - Add the specified loop to be a child of this loop. This
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/// updates the loop depth of the new child.
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///
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void addChildLoop(Loop *NewChild);
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void addChildLoop(LoopBase<BlockT> *NewChild) {
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assert(NewChild->ParentLoop == 0 && "NewChild already has a parent!");
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NewChild->ParentLoop = this;
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SubLoops.push_back(NewChild);
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}
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/// removeChildLoop - This removes the specified child from being a subloop of
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||||
/// this loop. The loop is not deleted, as it will presumably be inserted
|
||||
/// into another loop.
|
||||
Loop *removeChildLoop(iterator OldChild);
|
||||
LoopBase<BlockT> *removeChildLoop(iterator I) {
|
||||
assert(I != SubLoops.end() && "Cannot remove end iterator!");
|
||||
LoopBase<BlockT> *Child = *I;
|
||||
assert(Child->ParentLoop == this && "Child is not a child of this loop!");
|
||||
SubLoops.erase(SubLoops.begin()+(I-begin()));
|
||||
Child->ParentLoop = 0;
|
||||
return Child;
|
||||
}
|
||||
|
||||
/// addBlockEntry - This adds a basic block directly to the basic block list.
|
||||
/// This should only be used by transformations that create new loops. Other
|
||||
/// transformations should use addBasicBlockToLoop.
|
||||
void addBlockEntry(BasicBlock *BB) {
|
||||
void addBlockEntry(BlockT *BB) {
|
||||
Blocks.push_back(BB);
|
||||
}
|
||||
|
||||
/// moveToHeader - This method is used to move BB (which must be part of this
|
||||
/// loop) to be the loop header of the loop (the block that dominates all
|
||||
/// others).
|
||||
void moveToHeader(BasicBlock *BB) {
|
||||
void moveToHeader(BlockT *BB) {
|
||||
if (Blocks[0] == BB) return;
|
||||
for (unsigned i = 0; ; ++i) {
|
||||
assert(i != Blocks.size() && "Loop does not contain BB!");
|
||||
@ -217,23 +475,51 @@ public:
|
||||
/// removeBlockFromLoop - This removes the specified basic block from the
|
||||
/// current loop, updating the Blocks as appropriate. This does not update
|
||||
/// the mapping in the LoopInfo class.
|
||||
void removeBlockFromLoop(BasicBlock *BB);
|
||||
void removeBlockFromLoop(BlockT *BB) {
|
||||
RemoveFromVector(Blocks, BB);
|
||||
}
|
||||
|
||||
/// verifyLoop - Verify loop structure
|
||||
void verifyLoop() const;
|
||||
void verifyLoop() const {
|
||||
#ifndef NDEBUG
|
||||
assert (getHeader() && "Loop header is missing");
|
||||
assert (getLoopPreheader() && "Loop preheader is missing");
|
||||
assert (getLoopLatch() && "Loop latch is missing");
|
||||
for (typename std::vector<LoopBase<BlockT>*>::const_iterator I =
|
||||
SubLoops.begin(), E = SubLoops.end(); I != E; ++I)
|
||||
(*I)->verifyLoop();
|
||||
#endif
|
||||
}
|
||||
|
||||
void print(std::ostream &O, unsigned Depth = 0) const;
|
||||
void print(std::ostream &OS, unsigned Depth = 0) const {
|
||||
OS << std::string(Depth*2, ' ') << "Loop Containing: ";
|
||||
|
||||
for (unsigned i = 0; i < getBlocks().size(); ++i) {
|
||||
if (i) OS << ",";
|
||||
WriteAsOperand(OS, getBlocks()[i], false);
|
||||
}
|
||||
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;
|
||||
|
||||
void dump() const {
|
||||
print(cerr);
|
||||
}
|
||||
|
||||
private:
|
||||
friend class LoopInfo;
|
||||
Loop(BasicBlock *BB) : ParentLoop(0) {
|
||||
LoopBase(BlockT *BB) : ParentLoop(0) {
|
||||
Blocks.push_back(BB);
|
||||
}
|
||||
};
|
||||
|
||||
typedef LoopBase<BasicBlock> Loop;
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
@ -244,7 +530,7 @@ class LoopInfo : public FunctionPass {
|
||||
// BBMap - Mapping of basic blocks to the inner most loop they occur in
|
||||
std::map<BasicBlock*, Loop*> BBMap;
|
||||
std::vector<Loop*> TopLevelLoops;
|
||||
friend class Loop;
|
||||
friend class LoopBase<BasicBlock>;
|
||||
public:
|
||||
static char ID; // Pass identification, replacement for typeid
|
||||
|
||||
@ -360,6 +646,24 @@ template <> struct GraphTraits<Loop*> {
|
||||
}
|
||||
};
|
||||
|
||||
template<class BlockT>
|
||||
void LoopBase<BlockT>::addBasicBlockToLoop(BlockT *NewBB, LoopInfo &LI) {
|
||||
assert((Blocks.empty() || LI[getHeader()] == this) &&
|
||||
"Incorrect LI specified for this loop!");
|
||||
assert(NewBB && "Cannot add a null basic block to the loop!");
|
||||
assert(LI[NewBB] == 0 && "BasicBlock already in the loop!");
|
||||
|
||||
// Add the loop mapping to the LoopInfo object...
|
||||
LI.BBMap[NewBB] = this;
|
||||
|
||||
// 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();
|
||||
}
|
||||
}
|
||||
|
||||
} // End llvm namespace
|
||||
|
||||
// Make sure that any clients of this file link in LoopInfo.cpp
|
||||
|
@ -23,7 +23,6 @@
|
||||
namespace llvm {
|
||||
|
||||
class LPPassManager;
|
||||
class Loop;
|
||||
class Function;
|
||||
|
||||
class LoopPass : public Pass {
|
||||
|
@ -22,6 +22,7 @@
|
||||
#define LLVM_ANALYSIS_SCALAREVOLUTION_H
|
||||
|
||||
#include "llvm/Pass.h"
|
||||
#include "llvm/Analysis/LoopInfo.h"
|
||||
#include "llvm/Support/DataTypes.h"
|
||||
#include "llvm/Support/Streams.h"
|
||||
#include <set>
|
||||
@ -32,8 +33,6 @@ namespace llvm {
|
||||
class Instruction;
|
||||
class Type;
|
||||
class ConstantRange;
|
||||
class Loop;
|
||||
class LoopInfo;
|
||||
class SCEVHandle;
|
||||
class ScalarEvolution;
|
||||
|
||||
|
@ -20,13 +20,12 @@
|
||||
|
||||
#include <vector>
|
||||
#include "llvm/ADT/DenseMap.h"
|
||||
#include "llvm/Analysis/LoopInfo.h"
|
||||
|
||||
namespace llvm {
|
||||
|
||||
class Module;
|
||||
class Function;
|
||||
class Loop;
|
||||
class LoopInfo;
|
||||
class Pass;
|
||||
class LPPassManager;
|
||||
class BasicBlock;
|
||||
|
@ -14,13 +14,13 @@
|
||||
#ifndef LLVM_TRANSFORMS_UTILS_FUNCTION_H
|
||||
#define LLVM_TRANSFORMS_UTILS_FUNCTION_H
|
||||
|
||||
#include <llvm/Analysis/Dominators.h>
|
||||
#include "llvm/Analysis/Dominators.h"
|
||||
#include "llvm/Analysis/LoopInfo.h"
|
||||
#include <vector>
|
||||
|
||||
namespace llvm {
|
||||
class BasicBlock;
|
||||
class Function;
|
||||
class Loop;
|
||||
|
||||
/// ExtractCodeRegion - rip out a sequence of basic blocks into a new function
|
||||
///
|
||||
|
@ -34,69 +34,9 @@ X("loops", "Natural Loop Construction", true);
|
||||
//===----------------------------------------------------------------------===//
|
||||
// Loop implementation
|
||||
//
|
||||
bool Loop::contains(const BasicBlock *BB) const {
|
||||
return std::find(Blocks.begin(), Blocks.end(), BB) != Blocks.end();
|
||||
}
|
||||
|
||||
bool Loop::isLoopExit(const BasicBlock *BB) const {
|
||||
for (succ_const_iterator SI = succ_begin(BB), SE = succ_end(BB);
|
||||
SI != SE; ++SI) {
|
||||
if (!contains(*SI))
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/// getNumBackEdges - Calculate the number of back edges to the loop header.
|
||||
///
|
||||
unsigned Loop::getNumBackEdges() const {
|
||||
unsigned NumBackEdges = 0;
|
||||
BasicBlock *H = getHeader();
|
||||
|
||||
for (pred_iterator I = pred_begin(H), E = pred_end(H); I != E; ++I)
|
||||
if (contains(*I))
|
||||
++NumBackEdges;
|
||||
|
||||
return NumBackEdges;
|
||||
}
|
||||
|
||||
/// isLoopInvariant - Return true if the specified value is loop invariant
|
||||
///
|
||||
bool Loop::isLoopInvariant(Value *V) const {
|
||||
if (Instruction *I = dyn_cast<Instruction>(V))
|
||||
return !contains(I->getParent());
|
||||
return true; // All non-instructions are loop invariant
|
||||
}
|
||||
|
||||
void Loop::print(std::ostream &OS, unsigned Depth) const {
|
||||
OS << std::string(Depth*2, ' ') << "Loop Containing: ";
|
||||
|
||||
for (unsigned i = 0; i < getBlocks().size(); ++i) {
|
||||
if (i) OS << ",";
|
||||
WriteAsOperand(OS, getBlocks()[i], false);
|
||||
}
|
||||
OS << "\n";
|
||||
|
||||
for (iterator I = begin(), E = end(); I != E; ++I)
|
||||
(*I)->print(OS, Depth+2);
|
||||
}
|
||||
|
||||
/// verifyLoop - Verify loop structure
|
||||
void Loop::verifyLoop() const {
|
||||
#ifndef NDEBUG
|
||||
assert (getHeader() && "Loop header is missing");
|
||||
assert (getLoopPreheader() && "Loop preheader is missing");
|
||||
assert (getLoopLatch() && "Loop latch is missing");
|
||||
for (std::vector<Loop*>::const_iterator I = SubLoops.begin(), E = SubLoops.end();
|
||||
I != E; ++I)
|
||||
(*I)->verifyLoop();
|
||||
#endif
|
||||
}
|
||||
|
||||
void Loop::dump() const {
|
||||
print(cerr);
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// LoopInfo implementation
|
||||
@ -341,341 +281,5 @@ void LoopInfo::removeBlock(BasicBlock *BB) {
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
//===----------------------------------------------------------------------===//
|
||||
// APIs for simple analysis of the loop.
|
||||
//
|
||||
|
||||
/// getExitingBlocks - Return all blocks inside the loop that have successors
|
||||
/// outside of the loop. These are the blocks _inside of the current loop_
|
||||
/// which branch out. The returned list is always unique.
|
||||
///
|
||||
void Loop::getExitingBlocks(SmallVectorImpl<BasicBlock*> &ExitingBlocks) const {
|
||||
// Sort the blocks vector so that we can use binary search to do quick
|
||||
// lookups.
|
||||
SmallVector<BasicBlock*, 128> LoopBBs(block_begin(), block_end());
|
||||
std::sort(LoopBBs.begin(), LoopBBs.end());
|
||||
|
||||
for (std::vector<BasicBlock*>::const_iterator BI = Blocks.begin(),
|
||||
BE = Blocks.end(); BI != BE; ++BI)
|
||||
for (succ_iterator I = succ_begin(*BI), E = succ_end(*BI); I != E; ++I)
|
||||
if (!std::binary_search(LoopBBs.begin(), LoopBBs.end(), *I)) {
|
||||
// Not in current loop? It must be an exit block.
|
||||
ExitingBlocks.push_back(*BI);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/// getExitBlocks - Return all of the successor blocks of this loop. These
|
||||
/// are the blocks _outside of the current loop_ which are branched to.
|
||||
///
|
||||
void Loop::getExitBlocks(SmallVectorImpl<BasicBlock*> &ExitBlocks) const {
|
||||
// Sort the blocks vector so that we can use binary search to do quick
|
||||
// lookups.
|
||||
SmallVector<BasicBlock*, 128> LoopBBs(block_begin(), block_end());
|
||||
std::sort(LoopBBs.begin(), LoopBBs.end());
|
||||
|
||||
for (std::vector<BasicBlock*>::const_iterator BI = Blocks.begin(),
|
||||
BE = Blocks.end(); BI != BE; ++BI)
|
||||
for (succ_iterator I = succ_begin(*BI), E = succ_end(*BI); I != E; ++I)
|
||||
if (!std::binary_search(LoopBBs.begin(), LoopBBs.end(), *I))
|
||||
// Not in current loop? It must be an exit block.
|
||||
ExitBlocks.push_back(*I);
|
||||
}
|
||||
|
||||
/// 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 Loop::getUniqueExitBlocks(SmallVectorImpl<BasicBlock*> &ExitBlocks) const {
|
||||
// Sort the blocks vector so that we can use binary search to do quick
|
||||
// lookups.
|
||||
SmallVector<BasicBlock*, 128> LoopBBs(block_begin(), block_end());
|
||||
std::sort(LoopBBs.begin(), LoopBBs.end());
|
||||
|
||||
std::vector<BasicBlock*> switchExitBlocks;
|
||||
|
||||
for (std::vector<BasicBlock*>::const_iterator BI = Blocks.begin(),
|
||||
BE = Blocks.end(); BI != BE; ++BI) {
|
||||
|
||||
BasicBlock *current = *BI;
|
||||
switchExitBlocks.clear();
|
||||
|
||||
for (succ_iterator I = succ_begin(*BI), E = succ_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;
|
||||
|
||||
pred_iterator PI = pred_begin(*I);
|
||||
BasicBlock *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 (current->getTerminator()->getNumSuccessors() <= 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);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/// getLoopPreheader - If there is a preheader for this loop, return it. A
|
||||
/// loop has a preheader if there is only one edge to the header of the loop
|
||||
/// from outside of the loop. If this is the case, the block branching to the
|
||||
/// header of the loop is the preheader node.
|
||||
///
|
||||
/// This method returns null if there is no preheader for the loop.
|
||||
///
|
||||
BasicBlock *Loop::getLoopPreheader() const {
|
||||
// Keep track of nodes outside the loop branching to the header...
|
||||
BasicBlock *Out = 0;
|
||||
|
||||
// Loop over the predecessors of the header node...
|
||||
BasicBlock *Header = getHeader();
|
||||
for (pred_iterator PI = pred_begin(Header), PE = pred_end(Header);
|
||||
PI != PE; ++PI)
|
||||
if (!contains(*PI)) { // If the block is not in the loop...
|
||||
if (Out && Out != *PI)
|
||||
return 0; // Multiple predecessors outside the loop
|
||||
Out = *PI;
|
||||
}
|
||||
|
||||
// Make sure there is only one exit out of the preheader.
|
||||
assert(Out && "Header of loop has no predecessors from outside loop?");
|
||||
succ_iterator SI = succ_begin(Out);
|
||||
++SI;
|
||||
if (SI != succ_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 latch block for this loop, return it. A
|
||||
/// latch block is the canonical backedge for a loop. A loop header in normal
|
||||
/// form has two edges into it: one from a preheader and one from a latch
|
||||
/// block.
|
||||
BasicBlock *Loop::getLoopLatch() const {
|
||||
BasicBlock *Header = getHeader();
|
||||
pred_iterator PI = pred_begin(Header), PE = pred_end(Header);
|
||||
if (PI == PE) return 0; // no preds?
|
||||
|
||||
BasicBlock *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.
|
||||
///
|
||||
PHINode *Loop::getCanonicalInductionVariable() const {
|
||||
BasicBlock *H = getHeader();
|
||||
|
||||
BasicBlock *Incoming = 0, *Backedge = 0;
|
||||
pred_iterator PI = pred_begin(H);
|
||||
assert(PI != pred_end(H) && "Loop must have at least one backedge!");
|
||||
Backedge = *PI++;
|
||||
if (PI == pred_end(H)) return 0; // dead loop
|
||||
Incoming = *PI++;
|
||||
if (PI != pred_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 (BasicBlock::iterator I = H->begin(); isa<PHINode>(I); ++I) {
|
||||
PHINode *PN = cast<PHINode>(I);
|
||||
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.
|
||||
///
|
||||
Instruction *Loop::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.
|
||||
///
|
||||
Value *Loop::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));
|
||||
|
||||
BasicBlock *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;
|
||||
}
|
||||
|
||||
/// isLCSSAForm - Return true if the Loop is in LCSSA form
|
||||
bool Loop::isLCSSAForm() const {
|
||||
// Sort the blocks vector so that we can use binary search to do quick
|
||||
// lookups.
|
||||
SmallPtrSet<BasicBlock*, 16> LoopBBs(block_begin(), block_end());
|
||||
|
||||
for (block_iterator BI = block_begin(), E = block_end(); BI != E; ++BI) {
|
||||
BasicBlock *BB = *BI;
|
||||
for (BasicBlock::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) {
|
||||
BasicBlock *UserBB = cast<Instruction>(*UI)->getParent();
|
||||
if (PHINode *P = dyn_cast<PHINode>(*UI)) {
|
||||
unsigned OperandNo = UI.getOperandNo();
|
||||
UserBB = P->getIncomingBlock(OperandNo/2);
|
||||
}
|
||||
|
||||
// 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;
|
||||
}
|
||||
|
||||
//===-------------------------------------------------------------------===//
|
||||
// APIs for updating loop information after changing the CFG
|
||||
//
|
||||
|
||||
/// addBasicBlockToLoop - This function is used by other analyses to update loop
|
||||
/// information. NewBB is set to be a new member of the current loop. Because
|
||||
/// of this, it is added as a member of all parent loops, and is added 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 Loop::addBasicBlockToLoop(BasicBlock *NewBB, LoopInfo &LI) {
|
||||
assert((Blocks.empty() || LI[getHeader()] == this) &&
|
||||
"Incorrect LI specified for this loop!");
|
||||
assert(NewBB && "Cannot add a null basic block to the loop!");
|
||||
assert(LI[NewBB] == 0 && "BasicBlock already in the loop!");
|
||||
|
||||
// Add the loop mapping to the LoopInfo object...
|
||||
LI.BBMap[NewBB] = this;
|
||||
|
||||
// Add the basic block to this loop and all parent loops...
|
||||
Loop *L = this;
|
||||
while (L) {
|
||||
L->Blocks.push_back(NewBB);
|
||||
L = L->getParentLoop();
|
||||
}
|
||||
}
|
||||
|
||||
/// replaceChildLoopWith - This is used when splitting loops up. It replaces
|
||||
/// the OldChild entry in our children list with NewChild, and updates the
|
||||
/// parent pointers of the two loops as appropriate.
|
||||
void Loop::replaceChildLoopWith(Loop *OldChild, Loop *NewChild) {
|
||||
assert(OldChild->ParentLoop == this && "This loop is already broken!");
|
||||
assert(NewChild->ParentLoop == 0 && "NewChild already has a parent!");
|
||||
std::vector<Loop*>::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;
|
||||
}
|
||||
|
||||
/// addChildLoop - Add the specified loop to be a child of this loop.
|
||||
///
|
||||
void Loop::addChildLoop(Loop *NewChild) {
|
||||
assert(NewChild->ParentLoop == 0 && "NewChild already has a parent!");
|
||||
NewChild->ParentLoop = this;
|
||||
SubLoops.push_back(NewChild);
|
||||
}
|
||||
|
||||
template<typename T>
|
||||
static void RemoveFromVector(std::vector<T*> &V, T *N) {
|
||||
typename std::vector<T*>::iterator I = std::find(V.begin(), V.end(), N);
|
||||
assert(I != V.end() && "N is not in this list!");
|
||||
V.erase(I);
|
||||
}
|
||||
|
||||
/// 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.
|
||||
Loop *Loop::removeChildLoop(iterator I) {
|
||||
assert(I != SubLoops.end() && "Cannot remove end iterator!");
|
||||
Loop *Child = *I;
|
||||
assert(Child->ParentLoop == this && "Child is not a child of this loop!");
|
||||
SubLoops.erase(SubLoops.begin()+(I-begin()));
|
||||
Child->ParentLoop = 0;
|
||||
return Child;
|
||||
}
|
||||
|
||||
|
||||
/// removeBlockFromLoop - This removes the specified basic block from the
|
||||
/// current loop, updating the Blocks and ExitBlocks lists as appropriate. This
|
||||
/// does not update the mapping in the LoopInfo class.
|
||||
void Loop::removeBlockFromLoop(BasicBlock *BB) {
|
||||
RemoveFromVector(Blocks, BB);
|
||||
}
|
||||
|
||||
// Ensure this file gets linked when LoopInfo.h is used.
|
||||
DEFINING_FILE_FOR(LoopInfo)
|
||||
|
Loading…
Reference in New Issue
Block a user