1 files changed, 12 insertions, 0 deletions
diff --git a/absl/algorithm/algorithm.h b/absl/algorithm/algorithm.h
index 341b68b0..3d658643 100644
--- a/absl/algorithm/algorithm.h
+++ b/absl/algorithm/algorithm.h
@@ -59,6 +59,18 @@ bool EqualImpl(InputIter1 first1, InputIter1 last1, InputIter2 first2,
          std::equal(first1, last1, first2, std::forward<Pred>(pred));
 }
 
+// When we are using our own internal predicate that just applies operator==, we
+// forward to the non-predicate form of std::equal. This enables an optimization
+// in libstdc++ that can result in std::memcmp being used for integer types.
+template <typename InputIter1, typename InputIter2>
+bool EqualImpl(InputIter1 first1, InputIter1 last1, InputIter2 first2,
+               InputIter2 last2, algorithm_internal::EqualTo /* unused */,
+               std::random_access_iterator_tag,
+               std::random_access_iterator_tag) {
+  return (last1 - first1 == last2 - first2) &&
+         std::equal(first1, last1, first2);
+}
+
 template <typename It>
 It RotateImpl(It first, It middle, It last, std::true_type) {
   return std::rotate(first, middle, last);