Wheeler Jump

<h2 id="example">Example</h2>
<p>This example demonstrates the technique using a pseudo-<a href="/facts/Assembler_language/7XuV0cla">assembler language</a> for a simple byte-oriented accumulator-based machine with a single register, A:
</p>
 'prepare to call the subroutine
10 COPY PC TO A  ' copy the program counter (10) into the accumulator
11 JUMP          ' jump to...
12 70            ' ... location 70
... many more lines...
70 ADD CONST     ' add the following value to the accumulator...
71 3             ' ... three locations past the original PC value
72 STORE         ' store the value in the accumulator to...
73 91            ' ... the set-aside  memory location
... lines that perform the actual subroutine...
90 JUMP          ' return to...
91 0             ' ... which will be replaced by 13

<p>When this code completes, the JUMP instruction in address 90 will naturally return to location 13, the next instruction after the subroutine.
</p>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>Hill, Mark (2000). Readings in Computer Architecture. Gulf Professional Publishing. p. 3. ISBN 9781558605398. <a href="9781558605398" target="_blank">9781558605398</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Prof. David Brailsford, Sean Riley (6 February 2018). The Wheeler Jump. Computerphile; School of Computer Science, University of Nottingham, UK. Retrieved 2023-03-30. <a href="https://www.youtube.com/watch?time_continue=644&v=zR8V0lq029c&feature=emb_logo" target="_blank">https://www.youtube.com/watch?time_continue=644&v=zR8V0lq029c&feature=emb_logo</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
</ol>

Wheeler Jump open-in-new

Wheeler Jump