diff --git a/llvm/include/llvm/Transforms/Utils/FunctionAnnotator.h b/llvm/include/llvm/Transforms/Utils/FunctionAnnotator.h
new file mode 100644
--- /dev/null
+++ b/llvm/include/llvm/Transforms/Utils/FunctionAnnotator.h
@@ -0,0 +1,16 @@
+#ifndef LLVM_TRANSFORMS_FUNCTIONANNOTATOR_H
+#define LLVM_TRANSFORMS_FUNCTIONANNOTATOR_H
+
+#include "llvm/IR/PassManager.h"
+#include "llvm/Support/CommandLine.h"
+
+namespace llvm {
+class FunctionAnnotator : public PassInfoMixin<FunctionAnnotator> {
+public:
+  PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
+  static cl::opt<std::string> CSVFilePath;
+};
+
+} // namespace llvm
+
+#endif // LLVM_TRANSFORMS_FUNCTIONANNOTATOR_H
diff --git a/llvm/lib/Passes/PassBuilder.cpp b/llvm/lib/Passes/PassBuilder.cpp
--- a/llvm/lib/Passes/PassBuilder.cpp
+++ b/llvm/lib/Passes/PassBuilder.cpp
@@ -232,6 +232,7 @@
 #include "llvm/Transforms/Utils/Debugify.h"
 #include "llvm/Transforms/Utils/EntryExitInstrumenter.h"
 #include "llvm/Transforms/Utils/FixIrreducible.h"
+#include "llvm/Transforms/Utils/FunctionAnnotator.h"
 #include "llvm/Transforms/Utils/HelloWorld.h"
 #include "llvm/Transforms/Utils/InjectTLIMappings.h"
 #include "llvm/Transforms/Utils/InstructionNamer.h"
diff --git a/llvm/lib/Passes/PassRegistry.def b/llvm/lib/Passes/PassRegistry.def
--- a/llvm/lib/Passes/PassRegistry.def
+++ b/llvm/lib/Passes/PassRegistry.def
@@ -59,6 +59,7 @@
 MODULE_PASS("elim-avail-extern", EliminateAvailableExternallyPass())
 MODULE_PASS("extract-blocks", BlockExtractorPass({}, false))
 MODULE_PASS("forceattrs", ForceFunctionAttrsPass())
+MODULE_PASS("function-annotator", FunctionAnnotator())
 MODULE_PASS("function-import", FunctionImportPass())
 MODULE_PASS("globaldce", GlobalDCEPass())
 MODULE_PASS("globalopt", GlobalOptPass())
diff --git a/llvm/lib/Transforms/Utils/CMakeLists.txt b/llvm/lib/Transforms/Utils/CMakeLists.txt
--- a/llvm/lib/Transforms/Utils/CMakeLists.txt
+++ b/llvm/lib/Transforms/Utils/CMakeLists.txt
@@ -25,6 +25,7 @@
   Evaluator.cpp
   FixIrreducible.cpp
   FlattenCFG.cpp
+  FunctionAnnotator.cpp
   FunctionComparator.cpp
   FunctionImportUtils.cpp
   GlobalStatus.cpp
diff --git a/llvm/lib/Transforms/Utils/FunctionAnnotator.cpp b/llvm/lib/Transforms/Utils/FunctionAnnotator.cpp
new file mode 100644
--- /dev/null
+++ b/llvm/lib/Transforms/Utils/FunctionAnnotator.cpp
@@ -0,0 +1,45 @@
+#include "llvm/Transforms/Utils/FunctionAnnotator.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/LineIterator.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Testing/Annotations/Annotations.h"
+
+using namespace llvm;
+
+PreservedAnalyses FunctionAnnotator::run(Module &M, ModuleAnalysisManager &AM) {
+
+  static cl::opt<std::string> OptLevelAttributeName(
+      "-opt-level-attribute-name", cl::init(""), cl::Hidden,
+      cl::desc("Optimization attribute name"));
+
+  static cl::opt<std::string> CSVFilePath(
+      "-csv-file-path", cl::Hidden, cl::Required,
+      cl::desc("CSV file containing function names and optimization level as "
+               "attribute"));
+
+  auto BufferOrError = MemoryBuffer::getFileOrSTDIN(CSVFilePath);
+  if (!BufferOrError) {
+    report_fatal_error("Cannot open CSV File");
+  }
+
+  StringRef Buffer = BufferOrError.get()->getBuffer();
+  auto memoryBuffer = MemoryBuffer::getMemBuffer(Buffer);
+  line_iterator itr(*memoryBuffer, false);
+  for (Function &F : M) {
+    if (F.isDeclaration()) {
+      continue;
+    }
+
+    while (!itr.is_at_end()) {
+      if (itr.operator*().split(',').second != "") {
+        if (itr.operator*().split(',').first == F.getName()) {
+          F.addFnAttr(OptLevelAttributeName, itr.operator*().split(',').second);
+          break;
+        }
+      }
+      ++itr;
+    }
+  }
+
+  return PreservedAnalyses::all();
+}
\ No newline at end of file
diff --git a/llvm/test/Transforms/Annotations/FunctionAnnotation.csv b/llvm/test/Transforms/Annotations/FunctionAnnotation.csv
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/Annotations/FunctionAnnotation.csv
@@ -0,0 +1,6 @@
+FunctionName,OptimizationLevel
+first_function,O1
+second_function,O3
+third_function,O1
+fourth_function,O2
+fifth_function,O3
\ No newline at end of file
diff --git a/llvm/test/Transforms/Annotations/FunctionAnnotator.ll b/llvm/test/Transforms/Annotations/FunctionAnnotator.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/Annotations/FunctionAnnotator.ll
@@ -0,0 +1,6 @@
+; RUN: opt -passes='module(function-annotator)' -csv-file-path="./FunctionAnnotation.csv" < %s | FileCheck %s
+
+; CHECK_LABEL: AttributeList
+; CHECK-NEXT: AttributeList[
+; CHECK-NEXT:  { function => noinline nounwind ssp uwtable(sync) "O[0123]" [a-zA-Z_][a-zA-Z0-9_]["*\.\+-,]
+; CHECK-NEXT: ]