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<h5 class="subsection">Register Names</h5>



   <p>General-purpose registers are represented by predefined symbols of the

form <code>GR</code><var>nnn</var><code></code> (for global registers) or <code>LR</code><var>nnn</var><code></code>

(for local registers), where <var>nnn</var> represents a number between

<code>0</code> and <code>127</code>, written with no leading zeros.  The leading

letters may be in either upper or lower case; for example, <code>gr13</code>

and <code>LR7</code> are both valid register names.



   <p>You may also refer to general-purpose registers by specifying the

register number as the result of an expression (prefixed with <code>%%</code>

to flag the expression as a register number):

<pre class="smallexample">     %%<var>expression</var>

     </pre>



<p>--where <var>expression</var> must be an absolute expression evaluating to a

number between <code>0</code> and <code>255</code>.  The range [0, 127] refers to

global registers, and the range [128, 255] to local registers.



   <p>In addition, <code>as</code> understands the following protected

special-purpose register names for the AMD 29K family:



<pre class="smallexample">       vab    chd    pc0

       ops    chc    pc1

       cps    rbp    pc2

       cfg    tmc    mmu

       cha    tmr    lru

     </pre>



   <p>These unprotected special-purpose register names are also recognized:

<pre class="smallexample">       ipc    alu    fpe

       ipa    bp     inte

       ipb    fc     fps

       q      cr     exop

     </pre>



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