Add 'notail' marker for call instructions.

[oota-llvm.git] / docs / LangRef.rst

diff --git a/docs/LangRef.rst b/docs/LangRef.rst
index d2bba5c8a74310e22567cf78417c7b70e305463d..d58b7b2e4df720c691de1c898d6986bc9dffdd2b 100644 (file)
--- a/docs/LangRef.rst
+++ b/docs/LangRef.rst
@@ -8386,7 +8386,7 @@ Syntax:
 
 ::
 
-      <result> = [tail | musttail] call [cconv] [ret attrs] <ty> [<fnty>*] <fnptrval>(<function args>) [fn attrs]
+      <result> = [tail | musttail | notail ] call [cconv] [ret attrs] <ty> [<fnty>*] <fnptrval>(<function args>) [fn attrs]
                    [ operand bundles ]
 
 Overview:
@@ -8439,6 +8439,10 @@ This instruction requires several arguments:
    -  `Platform-specific constraints are
       met. <CodeGenerator.html#tailcallopt>`_
 
+#. The optional ``notail`` marker indicates that the optimizers should not add
+   ``tail`` or ``musttail`` markers to the call. It is used to prevent tail
+   call optimization from being performed on the call.
+
 #. The optional "cconv" marker indicates which :ref:`calling
    convention <callingconv>` the call should use. If none is
    specified, the call defaults to using C calling conventions. The