//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "licm"
#include "llvm/Transforms/Scalar.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/Instructions.h"
-#include "llvm/LLVMContext.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
-#include "llvm/Analysis/Dominators.h"
-#include "llvm/Transforms/Utils/Local.h"
-#include "llvm/Transforms/Utils/SSAUpdater.h"
-#include "llvm/Support/CFG.h"
+#include "llvm/Analysis/ScalarEvolution.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/IR/CFG.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Metadata.h"
+#include "llvm/IR/PredIteratorCache.h"
#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Debug.h"
-#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Utils/Local.h"
+#include "llvm/Transforms/Utils/LoopUtils.h"
+#include "llvm/Transforms/Utils/SSAUpdater.h"
#include <algorithm>
using namespace llvm;
+#define DEBUG_TYPE "licm"
+
STATISTIC(NumSunk , "Number of instructions sunk out of loop");
STATISTIC(NumHoisted , "Number of instructions hoisted out of loop");
STATISTIC(NumMovedLoads, "Number of load insts hoisted or sunk");
DisablePromotion("disable-licm-promotion", cl::Hidden,
cl::desc("Disable memory promotion in LICM pass"));
+static bool inSubLoop(BasicBlock *BB, Loop *CurLoop, LoopInfo *LI);
+static bool isNotUsedInLoop(const Instruction &I, const Loop *CurLoop);
+static bool hoist(Instruction &I, BasicBlock *Preheader);
+static bool sink(Instruction &I, const LoopInfo *LI, const DominatorTree *DT,
+ const Loop *CurLoop, AliasSetTracker *CurAST );
+static bool isGuaranteedToExecute(const Instruction &Inst,
+ const DominatorTree *DT,
+ const Loop *CurLoop,
+ const LICMSafetyInfo *SafetyInfo);
+static bool isSafeToExecuteUnconditionally(const Instruction &Inst,
+ const DominatorTree *DT,
+ const TargetLibraryInfo *TLI,
+ const Loop *CurLoop,
+ const LICMSafetyInfo *SafetyInfo,
+ const Instruction *CtxI = nullptr);
+static bool pointerInvalidatedByLoop(Value *V, uint64_t Size,
+ const AAMDNodes &AAInfo,
+ AliasSetTracker *CurAST);
+static Instruction *CloneInstructionInExitBlock(const Instruction &I,
+ BasicBlock &ExitBlock,
+ PHINode &PN,
+ const LoopInfo *LI);
+static bool canSinkOrHoistInst(Instruction &I, AliasAnalysis *AA,
+ DominatorTree *DT, TargetLibraryInfo *TLI,
+ Loop *CurLoop, AliasSetTracker *CurAST,
+ LICMSafetyInfo *SafetyInfo);
+
namespace {
struct LICM : public LoopPass {
static char ID; // Pass identification, replacement for typeid
initializeLICMPass(*PassRegistry::getPassRegistry());
}
- virtual bool runOnLoop(Loop *L, LPPassManager &LPM);
+ bool runOnLoop(Loop *L, LPPassManager &LPM) override;
/// This transformation requires natural loop information & requires that
/// loop preheaders be inserted into the CFG...
///
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
- AU.addRequired<DominatorTree>();
- AU.addRequired<LoopInfo>();
+ AU.addRequired<DominatorTreeWrapperPass>();
+ AU.addRequired<LoopInfoWrapperPass>();
AU.addRequiredID(LoopSimplifyID);
+ AU.addPreservedID(LoopSimplifyID);
+ AU.addRequiredID(LCSSAID);
+ AU.addPreservedID(LCSSAID);
AU.addRequired<AliasAnalysis>();
AU.addPreserved<AliasAnalysis>();
- AU.addPreserved("scalar-evolution");
- AU.addPreservedID(LoopSimplifyID);
+ AU.addPreserved<ScalarEvolution>();
+ AU.addRequired<TargetLibraryInfoWrapperPass>();
}
- bool doFinalization() {
+ using llvm::Pass::doFinalization;
+
+ bool doFinalization() override {
assert(LoopToAliasSetMap.empty() && "Didn't free loop alias sets");
return false;
}
LoopInfo *LI; // Current LoopInfo
DominatorTree *DT; // Dominator Tree for the current Loop.
+ TargetLibraryInfo *TLI; // TargetLibraryInfo for constant folding.
+
// State that is updated as we process loops.
bool Changed; // Set to true when we change anything.
BasicBlock *Preheader; // The preheader block of the current loop...
DenseMap<Loop*, AliasSetTracker*> LoopToAliasSetMap;
/// cloneBasicBlockAnalysis - Simple Analysis hook. Clone alias set info.
- void cloneBasicBlockAnalysis(BasicBlock *From, BasicBlock *To, Loop *L);
+ void cloneBasicBlockAnalysis(BasicBlock *From, BasicBlock *To,
+ Loop *L) override;
/// deleteAnalysisValue - Simple Analysis hook. Delete value V from alias
/// set.
- void deleteAnalysisValue(Value *V, Loop *L);
-
- /// SinkRegion - Walk the specified region of the CFG (defined by all blocks
- /// dominated by the specified block, and that are in the current loop) in
- /// reverse depth first order w.r.t the DominatorTree. This allows us to
- /// visit uses before definitions, allowing us to sink a loop body in one
- /// pass without iteration.
- ///
- void SinkRegion(DomTreeNode *N);
-
- /// HoistRegion - Walk the specified region of the CFG (defined by all
- /// blocks dominated by the specified block, and that are in the current
- /// loop) in depth first order w.r.t the DominatorTree. This allows us to
- /// visit definitions before uses, allowing us to hoist a loop body in one
- /// pass without iteration.
- ///
- void HoistRegion(DomTreeNode *N);
-
- /// inSubLoop - Little predicate that returns true if the specified basic
- /// block is in a subloop of the current one, not the current one itself.
- ///
- bool inSubLoop(BasicBlock *BB) {
- assert(CurLoop->contains(BB) && "Only valid if BB is IN the loop");
- return LI->getLoopFor(BB) != CurLoop;
- }
+ void deleteAnalysisValue(Value *V, Loop *L) override;
- /// sink - When an instruction is found to only be used outside of the loop,
- /// this function moves it to the exit blocks and patches up SSA form as
- /// needed.
- ///
- void sink(Instruction &I);
-
- /// hoist - When an instruction is found to only use loop invariant operands
- /// that is safe to hoist, this instruction is called to do the dirty work.
- ///
- void hoist(Instruction &I);
-
- /// isSafeToExecuteUnconditionally - Only sink or hoist an instruction if it
- /// is not a trapping instruction or if it is a trapping instruction and is
- /// guaranteed to execute.
- ///
- bool isSafeToExecuteUnconditionally(Instruction &I);
-
- /// pointerInvalidatedByLoop - Return true if the body of this loop may
- /// store into the memory location pointed to by V.
- ///
- bool pointerInvalidatedByLoop(Value *V, uint64_t Size,
- const MDNode *TBAAInfo) {
- // Check to see if any of the basic blocks in CurLoop invalidate *V.
- return CurAST->getAliasSetForPointer(V, Size, TBAAInfo).isMod();
- }
-
- bool canSinkOrHoistInst(Instruction &I);
- bool isNotUsedInLoop(Instruction &I);
-
- void PromoteAliasSet(AliasSet &AS);
+ /// Simple Analysis hook. Delete loop L from alias set map.
+ void deleteAnalysisLoop(Loop *L) override;
};
}
char LICM::ID = 0;
INITIALIZE_PASS_BEGIN(LICM, "licm", "Loop Invariant Code Motion", false, false)
-INITIALIZE_PASS_DEPENDENCY(DominatorTree)
-INITIALIZE_PASS_DEPENDENCY(LoopInfo)
+INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
+INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
+INITIALIZE_PASS_DEPENDENCY(LCSSA)
+INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
+INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
INITIALIZE_PASS_END(LICM, "licm", "Loop Invariant Code Motion", false, false)
Pass *llvm::createLICMPass() { return new LICM(); }
/// Hoist expressions out of the specified loop. Note, alias info for inner
-/// loop is not preserved so it is not a good idea to run LICM multiple
+/// loop is not preserved so it is not a good idea to run LICM multiple
/// times on one loop.
///
bool LICM::runOnLoop(Loop *L, LPPassManager &LPM) {
+ if (skipOptnoneFunction(L))
+ return false;
+
Changed = false;
// Get our Loop and Alias Analysis information...
- LI = &getAnalysis<LoopInfo>();
+ LI = &getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
AA = &getAnalysis<AliasAnalysis>();
- DT = &getAnalysis<DominatorTree>();
+ DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
+
+ TLI = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
+
+ assert(L->isLCSSAForm(*DT) && "Loop is not in LCSSA form.");
CurAST = new AliasSetTracker(*AA);
// Collect Alias info from subloops.
// What if InnerLoop was modified by other passes ?
CurAST->add(*InnerAST);
-
+
// Once we've incorporated the inner loop's AST into ours, we don't need the
// subloop's anymore.
delete InnerAST;
LoopToAliasSetMap.erase(InnerL);
}
-
+
CurLoop = L;
// Get the preheader block to move instructions into...
CurAST->add(*BB); // Incorporate the specified basic block
}
+ // Compute loop safety information.
+ LICMSafetyInfo SafetyInfo;
+ computeLICMSafetyInfo(&SafetyInfo, CurLoop);
+
// We want to visit all of the instructions in this loop... that are not parts
// of our subloops (they have already had their invariants hoisted out of
// their loop, into this loop, so there is no need to process the BODIES of
// instructions, we perform another pass to hoist them out of the loop.
//
if (L->hasDedicatedExits())
- SinkRegion(DT->getNode(L->getHeader()));
+ Changed |= sinkRegion(DT->getNode(L->getHeader()), AA, LI, DT, TLI, CurLoop,
+ CurAST, &SafetyInfo);
if (Preheader)
- HoistRegion(DT->getNode(L->getHeader()));
+ Changed |= hoistRegion(DT->getNode(L->getHeader()), AA, LI, DT, TLI,
+ CurLoop, CurAST, &SafetyInfo);
// Now that all loop invariants have been removed from the loop, promote any
// memory references to scalars that we can.
- if (!DisablePromotion && Preheader && L->hasDedicatedExits()) {
+ if (!DisablePromotion && (Preheader || L->hasDedicatedExits())) {
+ SmallVector<BasicBlock *, 8> ExitBlocks;
+ SmallVector<Instruction *, 8> InsertPts;
+ PredIteratorCache PIC;
+
// Loop over all of the alias sets in the tracker object.
for (AliasSetTracker::iterator I = CurAST->begin(), E = CurAST->end();
I != E; ++I)
- PromoteAliasSet(*I);
+ Changed |= promoteLoopAccessesToScalars(*I, ExitBlocks, InsertPts,
+ PIC, LI, DT, CurLoop,
+ CurAST, &SafetyInfo);
+
+ // Once we have promoted values across the loop body we have to recursively
+ // reform LCSSA as any nested loop may now have values defined within the
+ // loop used in the outer loop.
+ // FIXME: This is really heavy handed. It would be a bit better to use an
+ // SSAUpdater strategy during promotion that was LCSSA aware and reformed
+ // it as it went.
+ if (Changed)
+ formLCSSARecursively(*L, *DT, LI,
+ getAnalysisIfAvailable<ScalarEvolution>());
}
-
+
+ // Check that neither this loop nor its parent have had LCSSA broken. LICM is
+ // specifically moving instructions across the loop boundary and so it is
+ // especially in need of sanity checking here.
+ assert(L->isLCSSAForm(*DT) && "Loop not left in LCSSA form after LICM!");
+ assert((!L->getParentLoop() || L->getParentLoop()->isLCSSAForm(*DT)) &&
+ "Parent loop not left in LCSSA form after LICM!");
+
// Clear out loops state information for the next iteration
- CurLoop = 0;
- Preheader = 0;
+ CurLoop = nullptr;
+ Preheader = nullptr;
// If this loop is nested inside of another one, save the alias information
// for when we process the outer loop.
return Changed;
}
-/// SinkRegion - Walk the specified region of the CFG (defined by all blocks
-/// dominated by the specified block, and that are in the current loop) in
-/// reverse depth first order w.r.t the DominatorTree. This allows us to visit
-/// uses before definitions, allowing us to sink a loop body in one pass without
-/// iteration.
+/// Walk the specified region of the CFG (defined by all blocks dominated by
+/// the specified block, and that are in the current loop) in reverse depth
+/// first order w.r.t the DominatorTree. This allows us to visit uses before
+/// definitions, allowing us to sink a loop body in one pass without iteration.
///
-void LICM::SinkRegion(DomTreeNode *N) {
- assert(N != 0 && "Null dominator tree node?");
+bool llvm::sinkRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
+ DominatorTree *DT, TargetLibraryInfo *TLI, Loop *CurLoop,
+ AliasSetTracker *CurAST, LICMSafetyInfo *SafetyInfo) {
+
+ // Verify inputs.
+ assert(N != nullptr && AA != nullptr && LI != nullptr &&
+ DT != nullptr && CurLoop != nullptr && CurAST != nullptr &&
+ SafetyInfo != nullptr && "Unexpected input to sinkRegion");
+
+ // Set changed as false.
+ bool Changed = false;
+ // Get basic block
BasicBlock *BB = N->getBlock();
-
// If this subregion is not in the top level loop at all, exit.
- if (!CurLoop->contains(BB)) return;
+ if (!CurLoop->contains(BB)) return Changed;
// We are processing blocks in reverse dfo, so process children first.
const std::vector<DomTreeNode*> &Children = N->getChildren();
for (unsigned i = 0, e = Children.size(); i != e; ++i)
- SinkRegion(Children[i]);
-
+ Changed |=
+ sinkRegion(Children[i], AA, LI, DT, TLI, CurLoop, CurAST, SafetyInfo);
// Only need to process the contents of this block if it is not part of a
// subloop (which would already have been processed).
- if (inSubLoop(BB)) return;
+ if (inSubLoop(BB,CurLoop,LI)) return Changed;
for (BasicBlock::iterator II = BB->end(); II != BB->begin(); ) {
Instruction &I = *--II;
-
+
// If the instruction is dead, we would try to sink it because it isn't used
// in the loop, instead, just delete it.
- if (isInstructionTriviallyDead(&I)) {
+ if (isInstructionTriviallyDead(&I, TLI)) {
DEBUG(dbgs() << "LICM deleting dead inst: " << I << '\n');
++II;
CurAST->deleteValue(&I);
// outside of the loop. In this case, it doesn't even matter if the
// operands of the instruction are loop invariant.
//
- if (isNotUsedInLoop(I) && canSinkOrHoistInst(I)) {
+ if (isNotUsedInLoop(I, CurLoop) &&
+ canSinkOrHoistInst(I, AA, DT, TLI, CurLoop, CurAST, SafetyInfo)) {
++II;
- sink(I);
+ Changed |= sink(I, LI, DT, CurLoop, CurAST);
}
}
+ return Changed;
}
-/// HoistRegion - Walk the specified region of the CFG (defined by all blocks
-/// dominated by the specified block, and that are in the current loop) in depth
-/// first order w.r.t the DominatorTree. This allows us to visit definitions
-/// before uses, allowing us to hoist a loop body in one pass without iteration.
+/// Walk the specified region of the CFG (defined by all blocks dominated by
+/// the specified block, and that are in the current loop) in depth first
+/// order w.r.t the DominatorTree. This allows us to visit definitions before
+/// uses, allowing us to hoist a loop body in one pass without iteration.
///
-void LICM::HoistRegion(DomTreeNode *N) {
- assert(N != 0 && "Null dominator tree node?");
+bool llvm::hoistRegion(DomTreeNode *N, AliasAnalysis *AA, LoopInfo *LI,
+ DominatorTree *DT, TargetLibraryInfo *TLI, Loop *CurLoop,
+ AliasSetTracker *CurAST, LICMSafetyInfo *SafetyInfo) {
+ // Verify inputs.
+ assert(N != nullptr && AA != nullptr && LI != nullptr &&
+ DT != nullptr && CurLoop != nullptr && CurAST != nullptr &&
+ SafetyInfo != nullptr && "Unexpected input to hoistRegion");
+ // Set changed as false.
+ bool Changed = false;
+ // Get basic block
BasicBlock *BB = N->getBlock();
-
// If this subregion is not in the top level loop at all, exit.
- if (!CurLoop->contains(BB)) return;
-
+ if (!CurLoop->contains(BB)) return Changed;
// Only need to process the contents of this block if it is not part of a
// subloop (which would already have been processed).
- if (!inSubLoop(BB))
+ if (!inSubLoop(BB, CurLoop, LI))
for (BasicBlock::iterator II = BB->begin(), E = BB->end(); II != E; ) {
Instruction &I = *II++;
-
// Try constant folding this instruction. If all the operands are
// constants, it is technically hoistable, but it would be better to just
// fold it.
- if (Constant *C = ConstantFoldInstruction(&I)) {
+ if (Constant *C = ConstantFoldInstruction(
+ &I, I.getModule()->getDataLayout(), TLI)) {
DEBUG(dbgs() << "LICM folding inst: " << I << " --> " << *C << '\n');
CurAST->copyValue(&I, C);
CurAST->deleteValue(&I);
I.eraseFromParent();
continue;
}
-
+
// Try hoisting the instruction out to the preheader. We can only do this
// if all of the operands of the instruction are loop invariant and if it
// is safe to hoist the instruction.
//
- if (CurLoop->hasLoopInvariantOperands(&I) && canSinkOrHoistInst(I) &&
- isSafeToExecuteUnconditionally(I))
- hoist(I);
+ if (CurLoop->hasLoopInvariantOperands(&I) &&
+ canSinkOrHoistInst(I, AA, DT, TLI, CurLoop, CurAST, SafetyInfo) &&
+ isSafeToExecuteUnconditionally(I, DT, TLI, CurLoop, SafetyInfo,
+ CurLoop->getLoopPreheader()->getTerminator()))
+ Changed |= hoist(I, CurLoop->getLoopPreheader());
}
const std::vector<DomTreeNode*> &Children = N->getChildren();
for (unsigned i = 0, e = Children.size(); i != e; ++i)
- HoistRegion(Children[i]);
+ Changed |=
+ hoistRegion(Children[i], AA, LI, DT, TLI, CurLoop, CurAST, SafetyInfo);
+ return Changed;
+}
+
+/// Computes loop safety information, checks loop body & header
+/// for the possibility of may throw exception.
+///
+void llvm::computeLICMSafetyInfo(LICMSafetyInfo * SafetyInfo, Loop * CurLoop) {
+ assert(CurLoop != nullptr && "CurLoop cant be null");
+ BasicBlock *Header = CurLoop->getHeader();
+ // Setting default safety values.
+ SafetyInfo->MayThrow = false;
+ SafetyInfo->HeaderMayThrow = false;
+ // Iterate over header and compute safety info.
+ for (BasicBlock::iterator I = Header->begin(), E = Header->end();
+ (I != E) && !SafetyInfo->HeaderMayThrow; ++I)
+ SafetyInfo->HeaderMayThrow |= I->mayThrow();
+
+ SafetyInfo->MayThrow = SafetyInfo->HeaderMayThrow;
+ // Iterate over loop instructions and compute safety info.
+ for (Loop::block_iterator BB = CurLoop->block_begin(),
+ BBE = CurLoop->block_end(); (BB != BBE) && !SafetyInfo->MayThrow ; ++BB)
+ for (BasicBlock::iterator I = (*BB)->begin(), E = (*BB)->end();
+ (I != E) && !SafetyInfo->MayThrow; ++I)
+ SafetyInfo->MayThrow |= I->mayThrow();
}
/// canSinkOrHoistInst - Return true if the hoister and sinker can handle this
/// instruction.
///
-bool LICM::canSinkOrHoistInst(Instruction &I) {
+bool canSinkOrHoistInst(Instruction &I, AliasAnalysis *AA, DominatorTree *DT,
+ TargetLibraryInfo *TLI, Loop *CurLoop,
+ AliasSetTracker *CurAST, LICMSafetyInfo *SafetyInfo) {
// Loads have extra constraints we have to verify before we can hoist them.
if (LoadInst *LI = dyn_cast<LoadInst>(&I)) {
- if (LI->isVolatile())
- return false; // Don't hoist volatile loads!
+ if (!LI->isUnordered())
+ return false; // Don't hoist volatile/atomic loads!
// Loads from constant memory are always safe to move, even if they end up
// in the same alias set as something that ends up being modified.
if (AA->pointsToConstantMemory(LI->getOperand(0)))
return true;
-
+ if (LI->getMetadata(LLVMContext::MD_invariant_load))
+ return true;
+
// Don't hoist loads which have may-aliased stores in loop.
uint64_t Size = 0;
if (LI->getType()->isSized())
- Size = AA->getTypeStoreSize(LI->getType());
- return !pointerInvalidatedByLoop(LI->getOperand(0), Size,
- LI->getMetadata(LLVMContext::MD_tbaa));
+ Size = I.getModule()->getDataLayout().getTypeStoreSize(LI->getType());
+
+ AAMDNodes AAInfo;
+ LI->getAAMetadata(AAInfo);
+
+ return !pointerInvalidatedByLoop(LI->getOperand(0), Size, AAInfo, CurAST);
} else if (CallInst *CI = dyn_cast<CallInst>(&I)) {
// Don't sink or hoist dbg info; it's legal, but not useful.
if (isa<DbgInfoIntrinsic>(I))
return false;
// Handle simple cases by querying alias analysis.
- AliasAnalysis::ModRefBehavior Behavior = AA->getModRefBehavior(CI);
- if (Behavior == AliasAnalysis::DoesNotAccessMemory)
+ FunctionModRefBehavior Behavior = AA->getModRefBehavior(CI);
+ if (Behavior == FMRB_DoesNotAccessMemory)
return true;
if (AliasAnalysis::onlyReadsMemory(Behavior)) {
// If this call only reads from memory and there are no writes to memory
if (!FoundMod) return true;
}
- // FIXME: This should use mod/ref information to see if we can hoist or sink
- // the call.
+ // FIXME: This should use mod/ref information to see if we can hoist or
+ // sink the call.
return false;
}
- // Otherwise these instructions are hoistable/sinkable
- return isa<BinaryOperator>(I) || isa<CastInst>(I) ||
- isa<SelectInst>(I) || isa<GetElementPtrInst>(I) || isa<CmpInst>(I) ||
- isa<InsertElementInst>(I) || isa<ExtractElementInst>(I) ||
- isa<ShuffleVectorInst>(I);
+ // Only these instructions are hoistable/sinkable.
+ if (!isa<BinaryOperator>(I) && !isa<CastInst>(I) && !isa<SelectInst>(I) &&
+ !isa<GetElementPtrInst>(I) && !isa<CmpInst>(I) &&
+ !isa<InsertElementInst>(I) && !isa<ExtractElementInst>(I) &&
+ !isa<ShuffleVectorInst>(I) && !isa<ExtractValueInst>(I) &&
+ !isa<InsertValueInst>(I))
+ return false;
+
+ // TODO: Plumb the context instruction through to make hoisting and sinking
+ // more powerful. Hoisting of loads already works due to the special casing
+ // above.
+ return isSafeToExecuteUnconditionally(I, DT, TLI, CurLoop, SafetyInfo,
+ nullptr);
+}
+
+/// Returns true if a PHINode is a trivially replaceable with an
+/// Instruction.
+/// This is true when all incoming values are that instruction.
+/// This pattern occurs most often with LCSSA PHI nodes.
+///
+static bool isTriviallyReplacablePHI(const PHINode &PN, const Instruction &I) {
+ for (const Value *IncValue : PN.incoming_values())
+ if (IncValue != &I)
+ return false;
+
+ return true;
}
-/// isNotUsedInLoop - Return true if the only users of this instruction are
-/// outside of the loop. If this is true, we can sink the instruction to the
-/// exit blocks of the loop.
+/// Return true if the only users of this instruction are outside of
+/// the loop. If this is true, we can sink the instruction to the exit
+/// blocks of the loop.
///
-bool LICM::isNotUsedInLoop(Instruction &I) {
- for (Value::use_iterator UI = I.use_begin(), E = I.use_end(); UI != E; ++UI) {
- Instruction *User = cast<Instruction>(*UI);
- if (PHINode *PN = dyn_cast<PHINode>(User)) {
- // PHI node uses occur in predecessor blocks!
+static bool isNotUsedInLoop(const Instruction &I, const Loop *CurLoop) {
+ for (const User *U : I.users()) {
+ const Instruction *UI = cast<Instruction>(U);
+ if (const PHINode *PN = dyn_cast<PHINode>(UI)) {
+ // A PHI node where all of the incoming values are this instruction are
+ // special -- they can just be RAUW'ed with the instruction and thus
+ // don't require a use in the predecessor. This is a particular important
+ // special case because it is the pattern found in LCSSA form.
+ if (isTriviallyReplacablePHI(*PN, I)) {
+ if (CurLoop->contains(PN))
+ return false;
+ else
+ continue;
+ }
+
+ // Otherwise, PHI node uses occur in predecessor blocks if the incoming
+ // values. Check for such a use being inside the loop.
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (PN->getIncomingValue(i) == &I)
if (CurLoop->contains(PN->getIncomingBlock(i)))
return false;
- } else if (CurLoop->contains(User)) {
- return false;
+
+ continue;
}
+
+ if (CurLoop->contains(UI))
+ return false;
}
return true;
}
+static Instruction *CloneInstructionInExitBlock(const Instruction &I,
+ BasicBlock &ExitBlock,
+ PHINode &PN,
+ const LoopInfo *LI) {
+ Instruction *New = I.clone();
+ ExitBlock.getInstList().insert(ExitBlock.getFirstInsertionPt(), New);
+ if (!I.getName().empty()) New->setName(I.getName() + ".le");
+
+ // Build LCSSA PHI nodes for any in-loop operands. Note that this is
+ // particularly cheap because we can rip off the PHI node that we're
+ // replacing for the number and blocks of the predecessors.
+ // OPT: If this shows up in a profile, we can instead finish sinking all
+ // invariant instructions, and then walk their operands to re-establish
+ // LCSSA. That will eliminate creating PHI nodes just to nuke them when
+ // sinking bottom-up.
+ for (User::op_iterator OI = New->op_begin(), OE = New->op_end(); OI != OE;
+ ++OI)
+ if (Instruction *OInst = dyn_cast<Instruction>(*OI))
+ if (Loop *OLoop = LI->getLoopFor(OInst->getParent()))
+ if (!OLoop->contains(&PN)) {
+ PHINode *OpPN =
+ PHINode::Create(OInst->getType(), PN.getNumIncomingValues(),
+ OInst->getName() + ".lcssa", ExitBlock.begin());
+ for (unsigned i = 0, e = PN.getNumIncomingValues(); i != e; ++i)
+ OpPN->addIncoming(OInst, PN.getIncomingBlock(i));
+ *OI = OpPN;
+ }
+ return New;
+}
-/// sink - When an instruction is found to only be used outside of the loop,
-/// this function moves it to the exit blocks and patches up SSA form as needed.
+/// When an instruction is found to only be used outside of the loop, this
+/// function moves it to the exit blocks and patches up SSA form as needed.
/// This method is guaranteed to remove the original instruction from its
/// position, and may either delete it or move it to outside of the loop.
///
-void LICM::sink(Instruction &I) {
+static bool sink(Instruction &I, const LoopInfo *LI, const DominatorTree *DT,
+ const Loop *CurLoop, AliasSetTracker *CurAST ) {
DEBUG(dbgs() << "LICM sinking instruction: " << I << "\n");
-
- SmallVector<BasicBlock*, 8> ExitBlocks;
- CurLoop->getUniqueExitBlocks(ExitBlocks);
-
+ bool Changed = false;
if (isa<LoadInst>(I)) ++NumMovedLoads;
else if (isa<CallInst>(I)) ++NumMovedCalls;
++NumSunk;
Changed = true;
- // The case where there is only a single exit node of this loop is common
- // enough that we handle it as a special (more efficient) case. It is more
- // efficient to handle because there are no PHI nodes that need to be placed.
- if (ExitBlocks.size() == 1) {
- if (!isa<DbgInfoIntrinsic>(I) &&
- !DT->dominates(I.getParent(), ExitBlocks[0])) {
- // Instruction is not used, just delete it.
- CurAST->deleteValue(&I);
- // If I has users in unreachable blocks, eliminate.
- // If I is not void type then replaceAllUsesWith undef.
- // This allows ValueHandlers and custom metadata to adjust itself.
- if (!I.use_empty())
- I.replaceAllUsesWith(UndefValue::get(I.getType()));
- I.eraseFromParent();
- } else {
- // Move the instruction to the start of the exit block, after any PHI
- // nodes in it.
- I.moveBefore(ExitBlocks[0]->getFirstNonPHI());
-
- // This instruction is no longer in the AST for the current loop, because
- // we just sunk it out of the loop. If we just sunk it into an outer
- // loop, we will rediscover the operation when we process it.
- CurAST->deleteValue(&I);
- }
- return;
- }
-
- if (ExitBlocks.empty()) {
- // The instruction is actually dead if there ARE NO exit blocks.
- CurAST->deleteValue(&I);
- // If I has users in unreachable blocks, eliminate.
- // If I is not void type then replaceAllUsesWith undef.
- // This allows ValueHandlers and custom metadata to adjust itself.
- if (!I.use_empty())
- I.replaceAllUsesWith(UndefValue::get(I.getType()));
- I.eraseFromParent();
- return;
- }
-
- // Otherwise, if we have multiple exits, use the SSAUpdater to do all of the
- // hard work of inserting PHI nodes as necessary.
- SmallVector<PHINode*, 8> NewPHIs;
- SSAUpdater SSA(&NewPHIs);
-
- if (!I.use_empty())
- SSA.Initialize(I.getType(), I.getName());
-
- // Insert a copy of the instruction in each exit block of the loop that is
- // dominated by the instruction. Each exit block is known to only be in the
- // ExitBlocks list once.
- BasicBlock *InstOrigBB = I.getParent();
- unsigned NumInserted = 0;
-
- for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i) {
- BasicBlock *ExitBlock = ExitBlocks[i];
-
- if (!DT->dominates(InstOrigBB, ExitBlock))
+#ifndef NDEBUG
+ SmallVector<BasicBlock *, 32> ExitBlocks;
+ CurLoop->getUniqueExitBlocks(ExitBlocks);
+ SmallPtrSet<BasicBlock *, 32> ExitBlockSet(ExitBlocks.begin(),
+ ExitBlocks.end());
+#endif
+
+ // Clones of this instruction. Don't create more than one per exit block!
+ SmallDenseMap<BasicBlock *, Instruction *, 32> SunkCopies;
+
+ // If this instruction is only used outside of the loop, then all users are
+ // PHI nodes in exit blocks due to LCSSA form. Just RAUW them with clones of
+ // the instruction.
+ while (!I.use_empty()) {
+ Value::user_iterator UI = I.user_begin();
+ auto *User = cast<Instruction>(*UI);
+ if (!DT->isReachableFromEntry(User->getParent())) {
+ User->replaceUsesOfWith(&I, UndefValue::get(I.getType()));
continue;
-
- // Insert the code after the last PHI node.
- BasicBlock::iterator InsertPt = ExitBlock->getFirstNonPHI();
-
- // If this is the first exit block processed, just move the original
- // instruction, otherwise clone the original instruction and insert
- // the copy.
- Instruction *New;
- if (NumInserted++ == 0) {
- I.moveBefore(InsertPt);
- New = &I;
- } else {
- New = I.clone();
- if (!I.getName().empty())
- New->setName(I.getName()+".le");
- ExitBlock->getInstList().insert(InsertPt, New);
}
-
- // Now that we have inserted the instruction, inform SSAUpdater.
- if (!I.use_empty())
- SSA.AddAvailableValue(ExitBlock, New);
- }
-
- assert(NumInserted && "We shouldn't see dead instructions here!");
-
- // Next, rewrite uses of the instruction, inserting PHI nodes as needed.
- for (Value::use_iterator UI = I.use_begin(), UE = I.use_end(); UI != UE; ) {
- // Grab the use before incrementing the iterator.
+ // The user must be a PHI node.
+ PHINode *PN = cast<PHINode>(User);
+
+ // Surprisingly, instructions can be used outside of loops without any
+ // exits. This can only happen in PHI nodes if the incoming block is
+ // unreachable.
Use &U = UI.getUse();
- // Increment the iterator before removing the use from the list.
- ++UI;
- SSA.RewriteUseAfterInsertions(U);
+ BasicBlock *BB = PN->getIncomingBlock(U);
+ if (!DT->isReachableFromEntry(BB)) {
+ U = UndefValue::get(I.getType());
+ continue;
+ }
+
+ BasicBlock *ExitBlock = PN->getParent();
+ assert(ExitBlockSet.count(ExitBlock) &&
+ "The LCSSA PHI is not in an exit block!");
+
+ Instruction *New;
+ auto It = SunkCopies.find(ExitBlock);
+ if (It != SunkCopies.end())
+ New = It->second;
+ else
+ New = SunkCopies[ExitBlock] =
+ CloneInstructionInExitBlock(I, *ExitBlock, *PN, LI);
+
+ PN->replaceAllUsesWith(New);
+ PN->eraseFromParent();
}
-
- // Update CurAST for NewPHIs if I had pointer type.
- if (I.getType()->isPointerTy())
- for (unsigned i = 0, e = NewPHIs.size(); i != e; ++i)
- CurAST->copyValue(&I, NewPHIs[i]);
-
- // Finally, remove the instruction from CurAST. It is no longer in the loop.
+
CurAST->deleteValue(&I);
+ I.eraseFromParent();
+ return Changed;
}
-/// hoist - When an instruction is found to only use loop invariant operands
-/// that is safe to hoist, this instruction is called to do the dirty work.
+/// When an instruction is found to only use loop invariant operands that
+/// is safe to hoist, this instruction is called to do the dirty work.
///
-void LICM::hoist(Instruction &I) {
+static bool hoist(Instruction &I, BasicBlock *Preheader) {
DEBUG(dbgs() << "LICM hoisting to " << Preheader->getName() << ": "
<< I << "\n");
-
// Move the new node to the Preheader, before its terminator.
I.moveBefore(Preheader->getTerminator());
if (isa<LoadInst>(I)) ++NumMovedLoads;
else if (isa<CallInst>(I)) ++NumMovedCalls;
++NumHoisted;
- Changed = true;
+ return true;
}
-/// isSafeToExecuteUnconditionally - Only sink or hoist an instruction if it is
-/// not a trapping instruction or if it is a trapping instruction and is
-/// guaranteed to execute.
-///
-bool LICM::isSafeToExecuteUnconditionally(Instruction &Inst) {
- // If it is not a trapping instruction, it is always safe to hoist.
- if (Inst.isSafeToSpeculativelyExecute())
+/// Only sink or hoist an instruction if it is not a trapping instruction,
+/// or if the instruction is known not to trap when moved to the preheader.
+/// or if it is a trapping instruction and is guaranteed to execute.
+static bool isSafeToExecuteUnconditionally(const Instruction &Inst,
+ const DominatorTree *DT,
+ const TargetLibraryInfo *TLI,
+ const Loop *CurLoop,
+ const LICMSafetyInfo *SafetyInfo,
+ const Instruction *CtxI) {
+ if (isSafeToSpeculativelyExecute(&Inst, CtxI, DT, TLI))
return true;
- // Otherwise we have to check to make sure that the instruction dominates all
+ return isGuaranteedToExecute(Inst, DT, CurLoop, SafetyInfo);
+}
+
+static bool isGuaranteedToExecute(const Instruction &Inst,
+ const DominatorTree *DT,
+ const Loop *CurLoop,
+ const LICMSafetyInfo * SafetyInfo) {
+
+ // We have to check to make sure that the instruction dominates all
// of the exit blocks. If it doesn't, then there is a path out of the loop
// which does not execute this instruction, so we can't hoist it.
// common), it is always guaranteed to dominate the exit blocks. Since this
// is a common case, and can save some work, check it now.
if (Inst.getParent() == CurLoop->getHeader())
- return true;
+ // If there's a throw in the header block, we can't guarantee we'll reach
+ // Inst.
+ return !SafetyInfo->HeaderMayThrow;
+
+ // Somewhere in this loop there is an instruction which may throw and make us
+ // exit the loop.
+ if (SafetyInfo->MayThrow)
+ return false;
// Get the exit blocks for the current loop.
SmallVector<BasicBlock*, 8> ExitBlocks;
if (!DT->dominates(Inst.getParent(), ExitBlocks[i]))
return false;
+ // As a degenerate case, if the loop is statically infinite then we haven't
+ // proven anything since there are no exit blocks.
+ if (ExitBlocks.empty())
+ return false;
+
return true;
}
namespace {
class LoopPromoter : public LoadAndStorePromoter {
Value *SomePtr; // Designated pointer to store to.
- SmallPtrSet<Value*, 4> &PointerMustAliases;
+ SmallPtrSetImpl<Value*> &PointerMustAliases;
SmallVectorImpl<BasicBlock*> &LoopExitBlocks;
+ SmallVectorImpl<Instruction*> &LoopInsertPts;
+ PredIteratorCache &PredCache;
AliasSetTracker &AST;
+ LoopInfo &LI;
+ DebugLoc DL;
+ int Alignment;
+ AAMDNodes AATags;
+
+ Value *maybeInsertLCSSAPHI(Value *V, BasicBlock *BB) const {
+ if (Instruction *I = dyn_cast<Instruction>(V))
+ if (Loop *L = LI.getLoopFor(I->getParent()))
+ if (!L->contains(BB)) {
+ // We need to create an LCSSA PHI node for the incoming value and
+ // store that.
+ PHINode *PN = PHINode::Create(
+ I->getType(), PredCache.size(BB),
+ I->getName() + ".lcssa", BB->begin());
+ for (BasicBlock *Pred : PredCache.get(BB))
+ PN->addIncoming(I, Pred);
+ return PN;
+ }
+ return V;
+ }
+
public:
LoopPromoter(Value *SP,
- const SmallVectorImpl<Instruction*> &Insts, SSAUpdater &S,
- SmallPtrSet<Value*, 4> &PMA,
- SmallVectorImpl<BasicBlock*> &LEB, AliasSetTracker &ast)
- : LoadAndStorePromoter(Insts, S, 0, 0), SomePtr(SP),
- PointerMustAliases(PMA), LoopExitBlocks(LEB), AST(ast) {}
-
- virtual bool isInstInList(Instruction *I,
- const SmallVectorImpl<Instruction*> &) const {
+ ArrayRef<const Instruction *> Insts,
+ SSAUpdater &S, SmallPtrSetImpl<Value *> &PMA,
+ SmallVectorImpl<BasicBlock *> &LEB,
+ SmallVectorImpl<Instruction *> &LIP, PredIteratorCache &PIC,
+ AliasSetTracker &ast, LoopInfo &li, DebugLoc dl, int alignment,
+ const AAMDNodes &AATags)
+ : LoadAndStorePromoter(Insts, S), SomePtr(SP), PointerMustAliases(PMA),
+ LoopExitBlocks(LEB), LoopInsertPts(LIP), PredCache(PIC), AST(ast),
+ LI(li), DL(dl), Alignment(alignment), AATags(AATags) {}
+
+ bool isInstInList(Instruction *I,
+ const SmallVectorImpl<Instruction*> &) const override {
Value *Ptr;
if (LoadInst *LI = dyn_cast<LoadInst>(I))
Ptr = LI->getOperand(0);
Ptr = cast<StoreInst>(I)->getPointerOperand();
return PointerMustAliases.count(Ptr);
}
-
- virtual void doExtraRewritesBeforeFinalDeletion() const {
+
+ void doExtraRewritesBeforeFinalDeletion() const override {
// Insert stores after in the loop exit blocks. Each exit block gets a
// store of the live-out values that feed them. Since we've already told
// the SSA updater about the defs in the loop and the preheader
for (unsigned i = 0, e = LoopExitBlocks.size(); i != e; ++i) {
BasicBlock *ExitBlock = LoopExitBlocks[i];
Value *LiveInValue = SSA.GetValueInMiddleOfBlock(ExitBlock);
- Instruction *InsertPos = ExitBlock->getFirstNonPHI();
- new StoreInst(LiveInValue, SomePtr, InsertPos);
+ LiveInValue = maybeInsertLCSSAPHI(LiveInValue, ExitBlock);
+ Value *Ptr = maybeInsertLCSSAPHI(SomePtr, ExitBlock);
+ Instruction *InsertPos = LoopInsertPts[i];
+ StoreInst *NewSI = new StoreInst(LiveInValue, Ptr, InsertPos);
+ NewSI->setAlignment(Alignment);
+ NewSI->setDebugLoc(DL);
+ if (AATags) NewSI->setAAMetadata(AATags);
}
}
- virtual void replaceLoadWithValue(LoadInst *LI, Value *V) const {
+ void replaceLoadWithValue(LoadInst *LI, Value *V) const override {
// Update alias analysis.
AST.copyValue(LI, V);
}
- virtual void instructionDeleted(Instruction *I) const {
+ void instructionDeleted(Instruction *I) const override {
AST.deleteValue(I);
}
};
} // end anon namespace
-/// PromoteAliasSet - Try to promote memory values to scalars by sinking
-/// stores out of the loop and moving loads to before the loop. We do this by
-/// looping over the stores in the loop, looking for stores to Must pointers
-/// which are loop invariant.
+/// Try to promote memory values to scalars by sinking stores out of the
+/// loop and moving loads to before the loop. We do this by looping over
+/// the stores in the loop, looking for stores to Must pointers which are
+/// loop invariant.
///
-void LICM::PromoteAliasSet(AliasSet &AS) {
+bool llvm::promoteLoopAccessesToScalars(AliasSet &AS,
+ SmallVectorImpl<BasicBlock*>&ExitBlocks,
+ SmallVectorImpl<Instruction*>&InsertPts,
+ PredIteratorCache &PIC, LoopInfo *LI,
+ DominatorTree *DT, Loop *CurLoop,
+ AliasSetTracker *CurAST,
+ LICMSafetyInfo * SafetyInfo) {
+ // Verify inputs.
+ assert(LI != nullptr && DT != nullptr &&
+ CurLoop != nullptr && CurAST != nullptr &&
+ SafetyInfo != nullptr &&
+ "Unexpected Input to promoteLoopAccessesToScalars");
+ // Initially set Changed status to false.
+ bool Changed = false;
// We can promote this alias set if it has a store, if it is a "Must" alias
// set, if the pointer is loop invariant, and if we are not eliminating any
// volatile loads or stores.
if (AS.isForwardingAliasSet() || !AS.isMod() || !AS.isMustAlias() ||
AS.isVolatile() || !CurLoop->isLoopInvariant(AS.begin()->getValue()))
- return;
-
+ return Changed;
+
assert(!AS.empty() &&
"Must alias set should have at least one pointer element in it!");
+
Value *SomePtr = AS.begin()->getValue();
+ BasicBlock * Preheader = CurLoop->getLoopPreheader();
// It isn't safe to promote a load/store from the loop if the load/store is
// conditional. For example, turning:
// tmp = *P; for () { if (c) tmp +=1; } *P = tmp;
//
// is not safe, because *P may only be valid to access if 'c' is true.
- //
+ //
// It is safe to promote P if all uses are direct load/stores and if at
// least one is guaranteed to be executed.
bool GuaranteedToExecute = false;
-
+
SmallVector<Instruction*, 64> LoopUses;
SmallPtrSet<Value*, 4> PointerMustAliases;
+ // We start with an alignment of one and try to find instructions that allow
+ // us to prove better alignment.
+ unsigned Alignment = 1;
+ AAMDNodes AATags;
+ bool HasDedicatedExits = CurLoop->hasDedicatedExits();
+
// Check that all of the pointers in the alias set have the same type. We
// cannot (yet) promote a memory location that is loaded and stored in
- // different sizes.
+ // different sizes. While we are at it, collect alignment and AA info.
for (AliasSet::iterator ASI = AS.begin(), E = AS.end(); ASI != E; ++ASI) {
Value *ASIV = ASI->getValue();
PointerMustAliases.insert(ASIV);
-
+
// Check that all of the pointers in the alias set have the same type. We
// cannot (yet) promote a memory location that is loaded and stored in
// different sizes.
if (SomePtr->getType() != ASIV->getType())
- return;
-
- for (Value::use_iterator UI = ASIV->use_begin(), UE = ASIV->use_end();
- UI != UE; ++UI) {
+ return Changed;
+
+ for (User *U : ASIV->users()) {
// Ignore instructions that are outside the loop.
- Instruction *Use = dyn_cast<Instruction>(*UI);
- if (!Use || !CurLoop->contains(Use))
+ Instruction *UI = dyn_cast<Instruction>(U);
+ if (!UI || !CurLoop->contains(UI))
continue;
-
+
// If there is an non-load/store instruction in the loop, we can't promote
// it.
- if (isa<LoadInst>(Use))
- assert(!cast<LoadInst>(Use)->isVolatile() && "AST broken");
- else if (isa<StoreInst>(Use)) {
+ if (const LoadInst *load = dyn_cast<LoadInst>(UI)) {
+ assert(!load->isVolatile() && "AST broken");
+ if (!load->isSimple())
+ return Changed;
+ } else if (const StoreInst *store = dyn_cast<StoreInst>(UI)) {
// Stores *of* the pointer are not interesting, only stores *to* the
// pointer.
- if (Use->getOperand(1) != ASIV)
+ if (UI->getOperand(1) != ASIV)
continue;
- assert(!cast<StoreInst>(Use)->isVolatile() && "AST broken");
+ assert(!store->isVolatile() && "AST broken");
+ if (!store->isSimple())
+ return Changed;
+ // Don't sink stores from loops without dedicated block exits. Exits
+ // containing indirect branches are not transformed by loop simplify,
+ // make sure we catch that. An additional load may be generated in the
+ // preheader for SSA updater, so also avoid sinking when no preheader
+ // is available.
+ if (!HasDedicatedExits || !Preheader)
+ return Changed;
+
+ // Note that we only check GuaranteedToExecute inside the store case
+ // so that we do not introduce stores where they did not exist before
+ // (which would break the LLVM concurrency model).
+
+ // If the alignment of this instruction allows us to specify a more
+ // restrictive (and performant) alignment and if we are sure this
+ // instruction will be executed, update the alignment.
+ // Larger is better, with the exception of 0 being the best alignment.
+ unsigned InstAlignment = store->getAlignment();
+ if ((InstAlignment > Alignment || InstAlignment == 0) && Alignment != 0)
+ if (isGuaranteedToExecute(*UI, DT, CurLoop, SafetyInfo)) {
+ GuaranteedToExecute = true;
+ Alignment = InstAlignment;
+ }
+
+ if (!GuaranteedToExecute)
+ GuaranteedToExecute = isGuaranteedToExecute(*UI, DT,
+ CurLoop, SafetyInfo);
+
} else
- return; // Not a load or store.
-
- if (!GuaranteedToExecute)
- GuaranteedToExecute = isSafeToExecuteUnconditionally(*Use);
-
- LoopUses.push_back(Use);
+ return Changed; // Not a load or store.
+
+ // Merge the AA tags.
+ if (LoopUses.empty()) {
+ // On the first load/store, just take its AA tags.
+ UI->getAAMetadata(AATags);
+ } else if (AATags) {
+ UI->getAAMetadata(AATags, /* Merge = */ true);
+ }
+
+ LoopUses.push_back(UI);
}
}
-
+
// If there isn't a guaranteed-to-execute instruction, we can't promote.
if (!GuaranteedToExecute)
- return;
-
+ return Changed;
+
// Otherwise, this is safe to promote, lets do it!
- DEBUG(dbgs() << "LICM: Promoting value stored to in loop: " <<*SomePtr<<'\n');
+ DEBUG(dbgs() << "LICM: Promoting value stored to in loop: " <<*SomePtr<<'\n');
Changed = true;
++NumPromoted;
- SmallVector<BasicBlock*, 8> ExitBlocks;
- CurLoop->getUniqueExitBlocks(ExitBlocks);
-
+ // Grab a debug location for the inserted loads/stores; given that the
+ // inserted loads/stores have little relation to the original loads/stores,
+ // this code just arbitrarily picks a location from one, since any debug
+ // location is better than none.
+ DebugLoc DL = LoopUses[0]->getDebugLoc();
+
+ // Figure out the loop exits and their insertion points, if this is the
+ // first promotion.
+ if (ExitBlocks.empty()) {
+ CurLoop->getUniqueExitBlocks(ExitBlocks);
+ InsertPts.resize(ExitBlocks.size());
+ for (unsigned i = 0, e = ExitBlocks.size(); i != e; ++i)
+ InsertPts[i] = ExitBlocks[i]->getFirstInsertionPt();
+ }
+
// We use the SSAUpdater interface to insert phi nodes as required.
SmallVector<PHINode*, 16> NewPHIs;
SSAUpdater SSA(&NewPHIs);
- LoopPromoter Promoter(SomePtr, LoopUses, SSA, PointerMustAliases, ExitBlocks,
- *CurAST);
-
+ LoopPromoter Promoter(SomePtr, LoopUses, SSA,
+ PointerMustAliases, ExitBlocks,
+ InsertPts, PIC, *CurAST, *LI, DL, Alignment, AATags);
+
// Set up the preheader to have a definition of the value. It is the live-out
// value from the preheader that uses in the loop will use.
LoadInst *PreheaderLoad =
new LoadInst(SomePtr, SomePtr->getName()+".promoted",
Preheader->getTerminator());
+ PreheaderLoad->setAlignment(Alignment);
+ PreheaderLoad->setDebugLoc(DL);
+ if (AATags) PreheaderLoad->setAAMetadata(AATags);
SSA.AddAvailableValue(Preheader, PreheaderLoad);
// Rewrite all the loads in the loop and remember all the definitions from
// If the SSAUpdater didn't use the load in the preheader, just zap it now.
if (PreheaderLoad->use_empty())
PreheaderLoad->eraseFromParent();
-}
+ return Changed;
+}
-/// cloneBasicBlockAnalysis - Simple Analysis hook. Clone alias set info.
+/// Simple Analysis hook. Clone alias set info.
+///
void LICM::cloneBasicBlockAnalysis(BasicBlock *From, BasicBlock *To, Loop *L) {
AliasSetTracker *AST = LoopToAliasSetMap.lookup(L);
if (!AST)
AST->copyValue(From, To);
}
-/// deleteAnalysisValue - Simple Analysis hook. Delete value V from alias
-/// set.
+/// Simple Analysis hook. Delete value V from alias set
+///
void LICM::deleteAnalysisValue(Value *V, Loop *L) {
AliasSetTracker *AST = LoopToAliasSetMap.lookup(L);
if (!AST)
AST->deleteValue(V);
}
+
+/// Simple Analysis hook. Delete value L from alias set map.
+///
+void LICM::deleteAnalysisLoop(Loop *L) {
+ AliasSetTracker *AST = LoopToAliasSetMap.lookup(L);
+ if (!AST)
+ return;
+
+ delete AST;
+ LoopToAliasSetMap.erase(L);
+}
+
+
+/// Return true if the body of this loop may store into the memory
+/// location pointed to by V.
+///
+static bool pointerInvalidatedByLoop(Value *V, uint64_t Size,
+ const AAMDNodes &AAInfo,
+ AliasSetTracker *CurAST) {
+ // Check to see if any of the basic blocks in CurLoop invalidate *V.
+ return CurAST->getAliasSetForPointer(V, Size, AAInfo).isMod();
+}
+
+/// Little predicate that returns true if the specified basic block is in
+/// a subloop of the current one, not the current one itself.
+///
+static bool inSubLoop(BasicBlock *BB, Loop *CurLoop, LoopInfo *LI) {
+ assert(CurLoop->contains(BB) && "Only valid if BB is IN the loop");
+ return LI->getLoopFor(BB) != CurLoop;
+}
+
projects / oota-llvm.git / blobdiff