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