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<h4 class="section">i960 Machine Directives</h4>



     <dl>

<dt><code>.bss </code><var>symbol</var><code>, </code><var>length</var><code>, </code><var>align</var><code></code>

     <dd>Reserve <var>length</var> bytes in the bss section for a local <var>symbol</var>,

aligned to the power of two specified by <var>align</var>.  <var>length</var> and

<var>align</var> must be positive absolute expressions.  This directive

differs from <code>.lcomm</code> only in that it permits you to specify

an alignment.  See <a href="Lcomm.html#Lcomm"><code>.lcomm</code></a>. 

</dl>



     <dl>

<dt><code>.extended </code><var>flonums</var><code></code>

     <dd><code>.extended</code> expects zero or more flonums, separated by commas; for

each flonum, <code>.extended</code> emits an <small>IEEE</small> extended-format (80-bit)

floating-point number.



     <br><dt><code>.leafproc </code><var>call-lab</var><code>, </code><var>bal-lab</var><code></code>

     <dd>You can use the <code>.leafproc</code> directive in conjunction with the

optimized <code>callj</code> 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

<var>bal-lab</var> using <code>.leafproc</code>.  If the procedure also has an

entry point that goes through the normal prolog, you can specify that

entry point as <var>call-lab</var>.



     <p>A <code>.leafproc</code> declaration is meant for use in conjunction with the

optimized call instruction <code>callj</code>; the directive records the data

needed later to choose between converting the <code>callj</code> into a

<code>bal</code> or a <code>call</code>.



     <p><var>call-lab</var> is optional; if only one argument is present, or if the

two arguments are identical, the single argument is assumed to be the

<code>bal</code> entry point.



     <br><dt><code>.sysproc </code><var>name</var><code>, </code><var>index</var><code></code>

     <dd>The <code>.sysproc</code> directive defines a name for a system procedure. 

After you define it using <code>.sysproc</code>, you can use <var>name</var> to

refer to the system procedure identified by <var>index</var> when calling

procedures with the optimized call instruction <code>callj</code>.



     <p>Both arguments are required; <var>index</var> must be between 0 and 31

(inclusive). 

</dl>



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