Editing Spec.isa (section)

==== Individual letters ====

All lowercase letters can be used as shortcuts to refer to variables. A letter to refers to the first variable that starts with that letter, with the order being left-to-right in the syntax line and then top-to-bottom in the virtual operands.

If a letter appears multiple times, all of those appearances are seen together ignore intermediate parts. The bits are assigned LSB-to-MSB to the repeated letters in a right-to-left ordering. For example,

<pre>
%c = 0b110001
c 0 ccccc 0
</pre>

would result in <code>10100010</code>.