[AA] Make LI and EphValues option in EarliestEscapeInfo (NFC)

To allow using it in places where these may not be available.

Author: nikic

llvm/include/llvm/Analysis/AliasAnalysis.h

@@ -172,7 +172,7 @@ class SimpleCaptureInfo final : public CaptureInfo {
 /// approximation to a precise "captures before" analysis.
 class EarliestEscapeInfo final : public CaptureInfo {
   DominatorTree &DT;
-  const LoopInfo &LI;
+  const LoopInfo *LI;
 
   /// Map from identified local object to an instruction before which it does
   /// not escape, or nullptr if it never escapes. The "earliest" instruction
@@ -184,11 +184,11 @@ class EarliestEscapeInfo final : public CaptureInfo {
   /// This is used for cache invalidation purposes.
   DenseMap<Instruction *, TinyPtrVector<const Value *>> Inst2Obj;
 
-  const SmallPtrSetImpl<const Value *> &EphValues;
+  const SmallPtrSetImpl<const Value *> *EphValues;
 
 public:
-  EarliestEscapeInfo(DominatorTree &DT, const LoopInfo &LI,
-                     const SmallPtrSetImpl<const Value *> &EphValues)
+  EarliestEscapeInfo(DominatorTree &DT, const LoopInfo *LI = nullptr,
+                     const SmallPtrSetImpl<const Value *> *EphValues = nullptr)
       : DT(DT), LI(LI), EphValues(EphValues) {}
 
   bool isNotCapturedBeforeOrAt(const Value *Object,

llvm/include/llvm/Analysis/CaptureTracking.h

@@ -83,7 +83,7 @@ namespace llvm {
   Instruction *
   FindEarliestCapture(const Value *V, Function &F, bool ReturnCaptures,
                       bool StoreCaptures, const DominatorTree &DT,
-                      const SmallPtrSetImpl<const Value *> &EphValues,
+                      const SmallPtrSetImpl<const Value *> *EphValues = nullptr,
                       unsigned MaxUsesToExplore = 0);
 
   /// This callback is used in conjunction with PointerMayBeCaptured. In

llvm/lib/Analysis/BasicAliasAnalysis.cpp

@@ -219,7 +219,7 @@ bool EarliestEscapeInfo::isNotCapturedBeforeOrAt(const Value *Object,
     return true;
 
   return I != Iter.first->second &&
-         !isPotentiallyReachable(Iter.first->second, I, nullptr, &DT, &LI);
+         !isPotentiallyReachable(Iter.first->second, I, nullptr, &DT, LI);
 }
 
 void EarliestEscapeInfo::removeInstruction(Instruction *I) {

llvm/lib/Analysis/CaptureTracking.cpp

@@ -167,7 +167,7 @@ namespace {
   struct EarliestCaptures : public CaptureTracker {
 
     EarliestCaptures(bool ReturnCaptures, Function &F, const DominatorTree &DT,
-                     const SmallPtrSetImpl<const Value *> &EphValues)
+                     const SmallPtrSetImpl<const Value *> *EphValues)
         : EphValues(EphValues), DT(DT), ReturnCaptures(ReturnCaptures), F(F) {}
 
     void tooManyUses() override {
@@ -180,7 +180,7 @@ namespace {
       if (isa<ReturnInst>(I) && !ReturnCaptures)
         return false;
 
-      if (EphValues.contains(I))
+      if (EphValues && EphValues->contains(I))
         return false;
 
       if (!EarliestCapture)
@@ -194,7 +194,7 @@ namespace {
       return false;
     }
 
-    const SmallPtrSetImpl<const Value *> &EphValues;
+    const SmallPtrSetImpl<const Value *> *EphValues;
 
     Instruction *EarliestCapture = nullptr;
 
@@ -286,8 +286,7 @@ bool llvm::PointerMayBeCapturedBefore(const Value *V, bool ReturnCaptures,
 Instruction *
 llvm::FindEarliestCapture(const Value *V, Function &F, bool ReturnCaptures,
                           bool StoreCaptures, const DominatorTree &DT,
-
-                          const SmallPtrSetImpl<const Value *> &EphValues,
+                          const SmallPtrSetImpl<const Value *> *EphValues,
                           unsigned MaxUsesToExplore) {
   assert(!isa<GlobalValue>(V) &&
          "It doesn't make sense to ask whether a global is captured.");

llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp

@@ -865,7 +865,7 @@ struct DSEState {
   DSEState(Function &F, AliasAnalysis &AA, MemorySSA &MSSA, DominatorTree &DT,
            PostDominatorTree &PDT, AssumptionCache &AC,
            const TargetLibraryInfo &TLI, const LoopInfo &LI)
-      : F(F), AA(AA), EI(DT, LI, EphValues), BatchAA(AA, &EI), MSSA(MSSA),
+      : F(F), AA(AA), EI(DT, &LI, &EphValues), BatchAA(AA, &EI), MSSA(MSSA),
         DT(DT), PDT(PDT), TLI(TLI), DL(F.getParent()->getDataLayout()), LI(LI) {
     // Collect blocks with throwing instructions not modeled in MemorySSA and
     // alloc-like objects.