this post was submitted on 17 Nov 2023
46 points (89.7% liked)
Programming
16760 readers
85 users here now
Welcome to the main community in programming.dev! Feel free to post anything relating to programming here!
Cross posting is strongly encouraged in the instance. If you feel your post or another person's post makes sense in another community cross post into it.
Hope you enjoy the instance!
Rules
Rules
- Follow the programming.dev instance rules
- Keep content related to programming in some way
- If you're posting long videos try to add in some form of tldr for those who don't want to watch videos
Wormhole
Follow the wormhole through a path of communities [email protected]
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
The variable is set once, but the if expression is still evaluated every time (unless the compiler can optimize it)
(edit after skimming the article: yes,using the variable would solve the problem of the last example)
So there would be the branching overhead in every iteration. But that's something the cpu branch prediction should cover, especially since the taken branch will be identical in every loop.
Same also applied to the implied condition to break the for loop (only the first few and last iteration should be wrong predictions)