Don't use a potentially expensive shift if all we want is one set bit.

[oota-llvm.git] / docs / CommandGuide / llc.rst

diff --git a/docs/CommandGuide/llc.rst b/docs/CommandGuide/llc.rst
index 70354b0343e5b86df3b64f38194c4ee97ebdc6df..e6a59767aaff91d4c56f8a875b1ba54aba597937 100644 (file)
--- a/docs/CommandGuide/llc.rst
+++ b/docs/CommandGuide/llc.rst
@@ -69,6 +69,14 @@ End-user Options
 
    llvm-as < /dev/null | llc -march=xyz -mcpu=help
 
+.. option:: -filetype=<output file type>
+
+ Specify what kind of output ``llc`` should generated.  Options are: ``asm``
+ for textual assembly ( ``'.s'``), ``obj`` for native object files (``'.o'``)
+ and ``null`` for not emitting anything (for performance testing).
+
+ Note that not all targets support all options.
+
 .. option:: -mattr=a1,+a2,-a3,...
 
  Override or control specific attributes of the target, such as whether SIMD