..
  Copyright 1988-2022 Free Software Foundation, Inc.
  This is part of the GCC manual.
  For copying conditions, see the copyright.rst file.

.. _ishft:

.. index:: ISHFT

.. index:: BSHFT

.. index:: IISHFT

.. index:: JISHFT

.. index:: KISHFT

.. index:: bits, shift

ISHFT --- Shift bits
********************

.. function:: ISHFT()

  ``ISHFT`` returns a value corresponding to :samp:`{I}` with all of the
  bits shifted :samp:`{SHIFT}` places.  A value of :samp:`{SHIFT}` greater than
  zero corresponds to a left shift, a value of zero corresponds to no
  shift, and a value less than zero corresponds to a right shift.  If the
  absolute value of :samp:`{SHIFT}` is greater than ``BIT_SIZE(I)``, the
  value is undefined.  Bits shifted out from the left end or right end are
  lost; zeros are shifted in from the opposite end.

  :param I:
    The type shall be ``INTEGER``.

  :param SHIFT:
    The type shall be ``INTEGER``.

  :return:
    The return value is of type ``INTEGER`` and of the same kind as
    :samp:`{I}`.

  Standard:
    Fortran 90 and later, has overloads that are GNU extensions

  Class:
    Elemental function

  Syntax:
    .. code-block:: fortran

      RESULT = ISHFT(I, SHIFT)

  Specific names:
    .. list-table::
       :header-rows: 1

       * - Name
         - Argument
         - Return type
         - Standard

       * - ``ISHFT(A)``
         - ``INTEGER A``
         - ``INTEGER``
         - Fortran 90 and later
       * - ``BSHFT(A)``
         - ``INTEGER(1) A``
         - ``INTEGER(1)``
         - GNU extension
       * - ``IISHFT(A)``
         - ``INTEGER(2) A``
         - ``INTEGER(2)``
         - GNU extension
       * - ``JISHFT(A)``
         - ``INTEGER(4) A``
         - ``INTEGER(4)``
         - GNU extension
       * - ``KISHFT(A)``
         - ``INTEGER(8) A``
         - ``INTEGER(8)``
         - GNU extension

  See also:
    :ref:`ISHFTC`