Index: include/llvm/ProfileData/InstrProf.h
===================================================================
--- include/llvm/ProfileData/InstrProf.h
+++ include/llvm/ProfileData/InstrProf.h
@@ -413,19 +413,23 @@
   if (Counts.size() != Other.Counts.size())
     return instrprof_error::count_mismatch;
 
+  instrprof_error Result = instrprof_error::success;
+  uint64_t CounterMax = std::numeric_limits<uint64_t>::max();
+
   for (size_t I = 0, E = Other.Counts.size(); I < E; ++I) {
-    if (Counts[I] + Other.Counts[I] < Counts[I])
-      return instrprof_error::counter_overflow;
-    Counts[I] += Other.Counts[I];
+    Counts[I] = SaturatingAdd(Counts[I], Other.Counts[I]);
+    if (Other.Counts[I] > 0 && Counts[I] == CounterMax) {
+      Result = instrprof_error::counter_overflow;
+    }
   }
 
   for (uint32_t Kind = IPVK_First; Kind <= IPVK_Last; ++Kind) {
-    instrprof_error result = mergeValueProfData(Kind, Other);
-    if (result != instrprof_error::success)
-      return result;
+    instrprof_error MergeValueResult = mergeValueProfData(Kind, Other);
+    if (Result == instrprof_error::success)
+      Result = MergeValueResult;
   }
 
-  return instrprof_error::success;
+  return Result;
 }
 
 inline support::endianness getHostEndianness() {
Index: lib/ProfileData/InstrProfWriter.cpp
===================================================================
--- lib/ProfileData/InstrProfWriter.cpp
+++ lib/ProfileData/InstrProfWriter.cpp
@@ -107,22 +107,24 @@
   std::tie(Where, NewFunc) =
       ProfileDataMap.insert(std::make_pair(I.Hash, InstrProfRecord()));
   InstrProfRecord &Dest = Where->second;
+
+  instrprof_error Result = instrprof_error::success;
   if (NewFunc) {
     // We've never seen a function with this name and hash, add it.
     Dest = std::move(I);
   } else {
     // We're updating a function we've seen before.
     instrprof_error MergeResult = Dest.merge(I);
-    if (MergeResult != instrprof_error::success) {
-      return MergeResult;
-    }
+    if (Result == instrprof_error::success)
+      Result = MergeResult;
   }
 
   // We keep track of the max function count as we go for simplicity.
+  // Update this statistic no matter the result of the merge.
   if (Dest.Counts[0] > MaxFunctionCount)
     MaxFunctionCount = Dest.Counts[0];
 
-  return instrprof_error::success;
+  return Result;
 }
 
 std::pair<uint64_t, uint64_t> InstrProfWriter::writeImpl(raw_ostream &OS) {
Index: test/tools/llvm-profdata/overflow.proftext
===================================================================
--- test/tools/llvm-profdata/overflow.proftext
+++ test/tools/llvm-profdata/overflow.proftext
@@ -1,12 +1,20 @@
-# RUN: llvm-profdata merge %s -o %t.out 2>&1 | FileCheck %s
-# CHECK: overflow.proftext: overflow: Counter overflow
+# RUN: llvm-profdata merge %s -o %t.out 2>&1 | FileCheck %s --check-prefix=MERGE
+# RUN: llvm-profdata show %t.out | FileCheck %s --check-prefix=SHOW
+# MERGE: overflow.proftext: overflow: Counter overflow
+# SHOW: Total functions: 1
+# SHOW: Maximum function count: 18446744073709551615
+# SHOW: Maximum internal block count: 18446744073709551615
 
 overflow
 1
-1
+3
+18446744073709551615
 9223372036854775808
+18446744073709551615
 
 overflow
 1
-1
+3
+9223372036854775808
 9223372036854775808
+0
Index: unittests/ProfileData/InstrProfTest.cpp
===================================================================
--- unittests/ProfileData/InstrProfTest.cpp
+++ unittests/ProfileData/InstrProfTest.cpp
@@ -354,7 +354,7 @@
   const uint64_t Max = std::numeric_limits<uint64_t>::max();
 
   InstrProfRecord Record1("caller", 0x1234, {1});
-  InstrProfRecord Record2("caller", 0x1234, {1});
+  InstrProfRecord Record2("caller", 0x1234, {Max});
   InstrProfRecord Record3("callee1", 0x1235, {3, 4});
 
   Record1.reserveSites(IPVK_IndirectCallTarget, 1);
@@ -375,6 +375,9 @@
   // Verify saturation of counts.
   ErrorOr<InstrProfRecord> R = Reader->getInstrProfRecord("caller", 0x1234);
   ASSERT_TRUE(NoError(R.getError()));
+
+  ASSERT_EQ(Max, R.get().Counts[0]);
+
   ASSERT_EQ(1U, R.get().getNumValueSites(IPVK_IndirectCallTarget));
   std::unique_ptr<InstrProfValueData[]> VD =
           R.get().getValueForSite(IPVK_IndirectCallTarget, 0);