Reduce use list thrashing by using DenseMap's find_as for maps with ValueHandle keys.

No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159497 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 11 insertions, 9 deletions

diff --git a/lib/Analysis/AliasSetTracker.cpp b/lib/Analysis/AliasSetTracker.cpp
index f80e2fba80..92e89068e4 100644
--- a/lib/Analysis/AliasSetTracker.cpp
+++ b/lib/Analysis/AliasSetTracker.cpp
@@ -501,7 +501,7 @@ void AliasSetTracker::deleteValue(Value *PtrVal) {
   }
 
   // First, look up the PointerRec for this pointer.
-  PointerMapType::iterator I = PointerMap.find(PtrVal);
+  PointerMapType::iterator I = PointerMap.find_as(PtrVal);
   if (I == PointerMap.end()) return;  // Noop
 
   // If we found one, remove the pointer from the alias set it is in.
@@ -527,7 +527,7 @@ void AliasSetTracker::copyValue(Value *From, Value *To) {
   AA.copyValue(From, To);
 
   // First, look up the PointerRec for this pointer.
-  PointerMapType::iterator I = PointerMap.find(From);
+  PointerMapType::iterator I = PointerMap.find_as(From);
   if (I == PointerMap.end())
     return;  // Noop
   assert(I->second->hasAliasSet() && "Dead entry?");
@@ -536,7 +536,7 @@ void AliasSetTracker::copyValue(Value *From, Value *To) {
   if (Entry.hasAliasSet()) return;    // Already in the tracker!
 
   // Add it to the alias set it aliases...
-  I = PointerMap.find(From);
+  I = PointerMap.find_as(From);
   AliasSet *AS = I->second->getAliasSet(*this);
   AS->addPointer(*this, Entry, I->second->getSize(),
                  I->second->getTBAAInfo(),
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 09410496d3..b8c92f83d9 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -2726,7 +2726,7 @@ const SCEV *ScalarEvolution::getCouldNotCompute() {
 const SCEV *ScalarEvolution::getSCEV(Value *V) {
   assert(isSCEVable(V->getType()) && "Value is not SCEVable!");
 
-  ValueExprMapType::const_iterator I = ValueExprMap.find(V);
+  ValueExprMapType::const_iterator I = ValueExprMap.find_as(V);
   if (I != ValueExprMap.end()) return I->second;
   const SCEV *S = createSCEV(V);
 
@@ -2963,7 +2963,7 @@ ScalarEvolution::ForgetSymbolicName(Instruction *PN, const SCEV *SymName) {
     if (!Visited.insert(I)) continue;
 
     ValueExprMapType::iterator It =
-      ValueExprMap.find(static_cast<Value *>(I));
+      ValueExprMap.find_as(static_cast<Value *>(I));
     if (It != ValueExprMap.end()) {
       const SCEV *Old = It->second;
 
@@ -3020,7 +3020,7 @@ const SCEV *ScalarEvolution::createNodeForPHI(PHINode *PN) {
       if (BEValueV && StartValueV) {
         // While we are analyzing this PHI node, handle its value symbolically.
         const SCEV *SymbolicName = getUnknown(PN);
-        assert(ValueExprMap.find(PN) == ValueExprMap.end() &&
+        assert(ValueExprMap.find_as(PN) == ValueExprMap.end() &&
                "PHI node already processed?");
         ValueExprMap.insert(std::make_pair(SCEVCallbackVH(PN, this), SymbolicName));
 
@@ -4084,7 +4084,7 @@ ScalarEvolution::getBackedgeTakenInfo(const Loop *L) {
       if (!Visited.insert(I)) continue;
 
       ValueExprMapType::iterator It =
-        ValueExprMap.find(static_cast<Value *>(I));
+        ValueExprMap.find_as(static_cast<Value *>(I));
       if (It != ValueExprMap.end()) {
         const SCEV *Old = It->second;
 
@@ -4135,7 +4135,8 @@ void ScalarEvolution::forgetLoop(const Loop *L) {
     Instruction *I = Worklist.pop_back_val();
     if (!Visited.insert(I)) continue;
 
-    ValueExprMapType::iterator It = ValueExprMap.find(static_cast<Value *>(I));
+    ValueExprMapType::iterator It =
+      ValueExprMap.find_as(static_cast<Value *>(I));
     if (It != ValueExprMap.end()) {
       forgetMemoizedResults(It->second);
       ValueExprMap.erase(It);
@@ -4168,7 +4169,8 @@ void ScalarEvolution::forgetValue(Value *V) {
     I = Worklist.pop_back_val();
     if (!Visited.insert(I)) continue;
 
-    ValueExprMapType::iterator It = ValueExprMap.find(static_cast<Value *>(I));
+    ValueExprMapType::iterator It =
+      ValueExprMap.find_as(static_cast<Value *>(I));
     if (It != ValueExprMap.end()) {
       forgetMemoizedResults(It->second);
       ValueExprMap.erase(It);