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#### 9.15.3 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).