diff --git a/llvm/lib/Transforms/IPO/ForceFunctionAttrs.cpp b/llvm/lib/Transforms/IPO/ForceFunctionAttrs.cpp
--- a/llvm/lib/Transforms/IPO/ForceFunctionAttrs.cpp
+++ b/llvm/lib/Transforms/IPO/ForceFunctionAttrs.cpp
@@ -11,6 +11,8 @@
 #include "llvm/IR/Module.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/LineIterator.h"
+#include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
@@ -30,6 +32,11 @@
              "example -force-remove-attribute=foo:noinline. This "
              "option can be specified multiple times."));
 
+static cl::opt<std::string> CSVFilePath(
+    "func-annotator-csv-file-path", cl::Hidden,
+    cl::desc("CSV file containing function names and optimization level as "
+             "attribute"));
+
 /// If F has any forced attributes given on the command line, add them.
 /// If F has any forced remove attributes given on the command line, remove
 /// them. When both force and force-remove are given to a function, the latter
@@ -68,12 +75,51 @@
 }
 
 PreservedAnalyses ForceFunctionAttrsPass::run(Module &M,
-                                              ModuleAnalysisManager &) {
-  if (!hasForceAttributes())
-    return PreservedAnalyses::all();
+                                              ModuleAnalysisManager &AM) {
+
+  if (!CSVFilePath.empty()) {
+
+    auto BufferOrError = MemoryBuffer::getFileOrSTDIN(CSVFilePath);
+    if (!BufferOrError) {
+      report_fatal_error("Cannot open CSV file");
+    }
 
-  for (Function &F : M.functions())
-    forceAttributes(F);
+    StringRef Buffer = BufferOrError.get()->getBuffer();
+    auto MemoryBuffer = MemoryBuffer::getMemBuffer(Buffer);
+    line_iterator It(*MemoryBuffer);
+
+    for (++It; !It.is_at_end(); ++It) {
+      auto SplitPair = It->split(',');
+      if (!SplitPair.second.empty()) {
+        Function *Func = M.getFunction(SplitPair.first);
+        if (Func) {
+          if (Func->isDeclaration()) {
+            continue;
+          }
+          auto SecondSplitPair = SplitPair.second.split('=');
+          if (!SecondSplitPair.second.empty()) {
+            Func->addFnAttr(SecondSplitPair.first, SecondSplitPair.second);
+          } else {
+            auto AttrKind = Attribute::getAttrKindFromName(SplitPair.second);
+            if (AttrKind != Attribute::None &&
+                Attribute::canUseAsFnAttr(AttrKind)) {
+              Func->addFnAttr(AttrKind);
+            }
+          }
+        } else {
+          errs() << "Function in CSV file at line " << It.line_number()
+                 << " does not exist\n";
+          continue;
+        }
+      }
+    }
+  } else {
+    if (!hasForceAttributes())
+      return PreservedAnalyses::all();
+
+    for (Function &F : M.functions())
+      forceAttributes(F);
+  }
 
   // Just conservatively invalidate analyses, this isn't likely to be important.
   return PreservedAnalyses::none();
diff --git a/llvm/test/Transforms/ForcedFunctionAttrs/FunctionAnnotation.csv b/llvm/test/Transforms/ForcedFunctionAttrs/FunctionAnnotation.csv
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/ForcedFunctionAttrs/FunctionAnnotation.csv
@@ -0,0 +1,6 @@
+FunctionName,OptimizationLevel
+first_function,opt-level=O1
+second_function,cold
+third_function,opt-level=O1
+fourth_function,opt-level=O2
+fifth_function,foo=bar
diff --git a/llvm/test/Transforms/ForcedFunctionAttrs/FunctionAnnotator.ll b/llvm/test/Transforms/ForcedFunctionAttrs/FunctionAnnotator.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/ForcedFunctionAttrs/FunctionAnnotator.ll
@@ -0,0 +1,33 @@
+; RUN: opt -passes='forceattrs' -func-annotator-csv-file-path="%S/FunctionAnnotation.csv" -S < %s | FileCheck %s
+define void @first_function() {
+; CHECK: @first_function() #0
+  ret void
+}
+
+define void @second_function() {
+; CHECK: @second_function() #1
+  ret void
+}
+
+define void @third_function() {
+; CHECK: @third_function() #0
+  ret void
+}
+
+define void @fourth_function() {
+; CHECK: @fourth_function() #2
+  ret void
+}
+
+define void @fifth_function() {
+; CHECK: @fifth_function() #3
+  ret void
+}
+
+; CHECK-LABEL: attributes #0 = { "opt-level"="O1" }
+
+; CHECK-LABEL: attributes #1 = { cold }
+
+; CHECK-LABEL: attributes #2 = { "opt-level"="O2" }
+
+; CHECK-LABEL: attributes #3 = { "foo"="bar" }