3 files changed, 26 insertions, 0 deletions
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index 6c25069d0cc..b7273a3e05d 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -113,6 +113,11 @@ identified.  The improvements since the 3.8 release include:
 
   Warns about suspicious operations involving pointers and integral types.
 
+- New `misc-redundant-expression
+  <http://clang.llvm.org/extra/clang-tidy/checks/misc-redundant-expression.html>`_ check
+
+  Warns about redundant and equivalent expressions.
+
 - New `misc-sizeof-expression
   <http://clang.llvm.org/extra/clang-tidy/checks/misc-sizeof-expression.html>`_ check
 
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index db31a73fbba..113b341add2 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -67,6 +67,7 @@ Clang-Tidy Checks
    misc-noexcept-move-constructor
    misc-non-copyable-objects
    misc-pointer-and-integral-operation
+   misc-redundant-expression
    misc-sizeof-container
    misc-sizeof-expression
    misc-static-assert
diff --git a/clang-tools-extra/docs/clang-tidy/checks/misc-redundant-expression.rst b/clang-tools-extra/docs/clang-tidy/checks/misc-redundant-expression.rst
new file mode 100644
index 00000000000..812031d91b2
--- /dev/null
+++ b/clang-tools-extra/docs/clang-tidy/checks/misc-redundant-expression.rst
@@ -0,0 +1,20 @@
+.. title:: clang-tidy - misc-redundant-expression
+
+misc-redundant-expression
+=========================
+
+Detect redundant expressions which are typically errors due to copy-paste.
+
+Depending on the operator expressions may be
+  * redundant,
+  * always be `true`,
+  * always be `false`,
+  * always be a constant (zero or one)
+
+Example:
+.. code:: c++
+
+  ((x+1) | (x+1))             // (x+1) is redundant
+  (p->x == p->x)              // always true
+  (p->x < p->x)               // always false
+  (speed - speed + 1 == 12)   // speed - speed is always zero