Java-Gaming.org    
Featured games (91)
games approved by the League of Dukes
Games in Showcase (578)
games submitted by our members
Games in WIP (499)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  VM Question  (Read 658 times)
0 Members and 1 Guest are viewing this topic.
Offline dime

Senior Newbie





« Posted 2010-09-07 14:17:17 »


Say I have code like this:
X + Y - 10;

Say I run that in my main game loop (few hundred times per second if not more).

Say neither X or Y change in a great while.  Will that get calculated each time or is it smart enough to cache that internally and only recalculate it if either X or Y has changed?
Offline delt0r

JGO Coder


Medals: 22


Computers can do that?


« Reply #1 - Posted 2010-09-07 15:09:31 »

Your statement is dead code (doesn't assign the result to anything). It will get removed in the first iteration of optimization and never get executed.

If however you meant:

Z=X+Y+10;

And x and y are not getting updated often, it will probably still fully evaluate the expression because X & Y *can* change and it simply won't be able to work out when.

I have no special talents. I am only passionately curious.--Albert Einstein
Offline OverKill

Junior Member




Java games rock!


« Reply #2 - Posted 2010-09-08 09:42:00 »

Yeah, also I would honestly doubt you have to optimize THAT part.
Because addition is really not that expensive and in order to 'optimize' it the introduced code (around that block) would probably cost the same as just doing the math.

BUT if you REALLY want to:
* store the value of Z in a field
* create setters for X and Y and when one of them gets set, recalculate Z
* use the field
* partay!
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

xsi3rr4x (28 views)
2014-04-15 18:08:23

BurntPizza (26 views)
2014-04-15 03:46:01

UprightPath (41 views)
2014-04-14 17:39:50

UprightPath (23 views)
2014-04-14 17:35:47

Porlus (40 views)
2014-04-14 15:48:38

tom_mai78101 (62 views)
2014-04-10 04:04:31

BurntPizza (121 views)
2014-04-08 23:06:04

tom_mai78101 (221 views)
2014-04-05 13:34:39

trollwarrior1 (188 views)
2014-04-04 12:06:45

CJLetsGame (197 views)
2014-04-01 02:16:10
List of Learning Resources
by SHC
2014-04-18 03:17:39

List of Learning Resources
by Longarmx
2014-04-08 03:14:44

Good Examples
by matheus23
2014-04-05 13:51:37

Good Examples
by Grunnt
2014-04-03 15:48:46

Good Examples
by Grunnt
2014-04-03 15:48:37

Good Examples
by matheus23
2014-04-01 18:40:51

Good Examples
by matheus23
2014-04-01 18:40:34

Anonymous/Local/Inner class gotchas
by Roquen
2014-03-11 15:22:30
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!