diff --git a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
index 6d3aea2721de63..62038b10fccd8f 100644
--- a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -1031,12 +1031,7 @@ class AArch64Operand : public MCParsedAsmOperand {
     if (DarwinRefKind != MCSymbolRefExpr::VK_None)
       return false;
 
-    for (unsigned i = 0; i != AllowedModifiers.size(); ++i) {
-      if (ELFRefKind == AllowedModifiers[i])
-        return true;
-    }
-
-    return false;
+    return llvm::is_contained(AllowedModifiers, ELFRefKind);
   }
 
   bool isMovWSymbolG3() const {
diff --git a/llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp b/llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
index dc58b54274257f..7e31ea77f4f530 100644
--- a/llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
+++ b/llvm/lib/Target/ARM/MVETPAndVPTOptimisationsPass.cpp
@@ -366,7 +366,7 @@ bool MVETPAndVPTOptimisations::MergeLoopEnd(MachineLoop *ML) {
     while (!Worklist.empty()) {
       Register Reg = Worklist.pop_back_val();
       for (MachineInstr &MI : MRI->use_nodbg_instructions(Reg)) {
-        if (count(ExpectedUsers, &MI))
+        if (llvm::is_contained(ExpectedUsers, &MI))
           continue;
         if (MI.getOpcode() != TargetOpcode::COPY ||
             !MI.getOperand(0).getReg().isVirtual()) {
diff --git a/llvm/lib/Transforms/IPO/Attributor.cpp b/llvm/lib/Transforms/IPO/Attributor.cpp
index edadc79e3a9f9b..7e729e57153cd5 100644
--- a/llvm/lib/Transforms/IPO/Attributor.cpp
+++ b/llvm/lib/Transforms/IPO/Attributor.cpp
@@ -2139,12 +2139,10 @@ bool Attributor::shouldSeedAttribute(AbstractAttribute &AA) {
   bool Result = true;
 #ifndef NDEBUG
   if (SeedAllowList.size() != 0)
-    Result =
-        std::count(SeedAllowList.begin(), SeedAllowList.end(), AA.getName());
+    Result = llvm::is_contained(SeedAllowList, AA.getName());
   Function *Fn = AA.getAnchorScope();
   if (FunctionSeedAllowList.size() != 0 && Fn)
-    Result &= std::count(FunctionSeedAllowList.begin(),
-                         FunctionSeedAllowList.end(), Fn->getName());
+    Result &= llvm::is_contained(FunctionSeedAllowList, Fn->getName());
 #endif
   return Result;
 }
diff --git a/llvm/lib/Transforms/IPO/HotColdSplitting.cpp b/llvm/lib/Transforms/IPO/HotColdSplitting.cpp
index 833049d6896fab..a964fcde039660 100644
--- a/llvm/lib/Transforms/IPO/HotColdSplitting.cpp
+++ b/llvm/lib/Transforms/IPO/HotColdSplitting.cpp
@@ -294,7 +294,7 @@ static int getOutliningPenalty(ArrayRef<BasicBlock *> Region,
       // Find all incoming values from the outlining region.
       int NumIncomingVals = 0;
       for (unsigned i = 0; i < PN.getNumIncomingValues(); ++i)
-        if (find(Region, PN.getIncomingBlock(i)) != Region.end()) {
+        if (llvm::is_contained(Region, PN.getIncomingBlock(i))) {
           ++NumIncomingVals;
           if (NumIncomingVals > 1) {
             ++NumSplitExitPhis;
diff --git a/llvm/utils/TableGen/CodeGenSchedule.cpp b/llvm/utils/TableGen/CodeGenSchedule.cpp
index ee52b2e7ab9f34..7c1c37f7b37063 100644
--- a/llvm/utils/TableGen/CodeGenSchedule.cpp
+++ b/llvm/utils/TableGen/CodeGenSchedule.cpp
@@ -1398,7 +1398,7 @@ bool PredTransitions::mutuallyExclusive(Record *PredDef,
       //
       // if (A) return ...;
       // if (B) return ...;
-      if (!count(Preds, PC.Predicate))
+      if (!llvm::is_contained(Preds, PC.Predicate))
         continue;
       return true;
     }