Stories
Slash Boxes
Comments

SoylentNews is people

posted by martyb on Monday November 02 2015, @04:31AM   Printer-friendly
from the next-up:-jump-jiving dept.

The "jump threading" compiler optimization (aka -fthread-jump) turns conditional into unconditional branches on certain paths at the expense of code size. For hardware with branch prediction, speculative execution, and prefetching, this can greatly improve performance. However, there is no scientific publication or documentation at all. The Wikipedia article is very short and incomplete.

The linked article has an illustrated treatment of common code structures and how these optimizations work.


Original Submission

 
This discussion has been archived. No new comments can be posted.
Display Options Threshold/Breakthrough Mark All as Read Mark All as Unread
The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
  • (Score: 2) by tibman on Tuesday November 03 2015, @02:51AM

    by tibman (134) Subscriber Badge on Tuesday November 03 2015, @02:51AM (#257795)

    Being readable and easier to maintain is better than saving on function overhead. If the compiler finds it is best to in-line some functions, let it do that. Unless you are dealing with an extremely resource constrained system.

    --
    SN won't survive on lurkers alone. Write comments.
    Starting Score:    1  point
    Karma-Bonus Modifier   +1  

    Total Score:   2  
  • (Score: 0) by Anonymous Coward on Tuesday November 03 2015, @03:59AM

    by Anonymous Coward on Tuesday November 03 2015, @03:59AM (#257805)

    Being readable and easier to maintain is better than saving on function overhead.

    You can make readable and maintainable code with gotos. And even a system that isn't necessarily resource constrained doesn't deserve to be abused by sloppy coding. I know that more processing power means that programming think they can waste as many resources as possible, but I prefer not to.

    • (Score: 2) by tibman on Tuesday November 03 2015, @02:14PM

      by tibman (134) Subscriber Badge on Tuesday November 03 2015, @02:14PM (#257922)

      Removing duplicate code by putting it into a function is not a waste of resources. That is a major reason why functions exist. Doing the same with gotos is fine as well, i never said otherwise.

      --
      SN won't survive on lurkers alone. Write comments.