× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  1.  Home
  2. MIDRANGE-L
  3. October 2011

Re: Executing an XORSTR in ILE?

On 10/19/2011 10:04 AM, Dennis wrote:
On a mildly relevant track: not sure how widely known this is so I'll present a challenge: What are the three logical instructions that, when executed in order, will cause the values of A and B to be swapped, without need of a work area?


I'd say it's pretty widely known by those who did assembly language programming. It's a great way to swap registers without going to memory.

A = A XOR B (makes A a combination of A and B)
B = A XOR B (sets B to A)
A = A XOR B (sets A to B)

Joe



As an Amazon Associate we earn from qualifying purchases.

This thread ...
Replies:
Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.