LanguageExtensions.rst

  #pragma clang loop unroll_count(8)
  for(...) {
    ...
  }

Unrolling of a loop can be prevented by specifying ``unroll(disable)``.

Additional Information
----------------------

For convenience multiple loop hints can be specified on a single line.

.. code-block:: c++

  #pragma clang loop vectorize_width(4) interleave_count(8)
  for(...) {
    ...
  }

If an optimization cannot be applied any hints that apply to it will be ignored.
For example, the hint ``vectorize_width(4)`` is ignored if the loop is not
proven safe to vectorize. To identify and diagnose optimization issues use
`-Rpass`, `-Rpass-missed`, and `-Rpass-analysis` command line options. See the
user guide for details.