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#### i960 Machine Directives

`.bss` symbol`,` length`,` align``
  Reserve length bytes in the bss section for a local symbol, aligned to the power of two specified by align. length and align must be positive absolute expressions. This directive differs from `.lcomm` only in that it permits you to specify an alignment. See `.lcomm`.

`.extended` flonums``
  `.extended` expects zero or more flonums, separated by commas; for each flonum, `.extended` emits an IEEE extended-format (80-bit) floating-point number.
`.leafproc` call-lab`,` bal-lab``
  You can use the `.leafproc` directive in conjunction with the optimized `callj` instruction to enable faster calls of leaf procedures. If a procedure is known to call no other procedures, you may define an entry point that skips procedure prolog code (and that does not depend on system-supplied saved context), and declare it as the bal-lab using `.leafproc`. If the procedure also has an entry point that goes through the normal prolog, you can specify that entry point as call-lab.

  A `.leafproc` declaration is meant for use in conjunction with the optimized call instruction `callj`; the directive records the data needed later to choose between converting the `callj` into a `bal` or a `call`.

  call-lab is optional; if only one argument is present, or if the two arguments are identical, the single argument is assumed to be the `bal` entry point.

`.sysproc` name`,` index``
  The `.sysproc` directive defines a name for a system procedure. After you define it using `.sysproc`, you can use name to refer to the system procedure identified by index when calling procedures with the optimized call instruction `callj`.

  Both arguments are required; index must be between 0 and 31 (inclusive).