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Victor Kindhart



Joined: 02 Feb 2015
Posts: 7
Victor Kindhart
The title says it all. When should I use pusha instead of push ..., push ... - I mean, when pusha gets faster than a couple of push instructions?
Post 17 Jun 2015, 14:53
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17270
Location: In your JS exploiting you and your system
revolution
Victor Kindhart wrote:
The title says it all. When should I use pusha instead of push ..., push ... - I mean, when pusha gets faster than a couple of push instructions?
That depends upon so many factors that we can't know the answer.

My guess is that for modern CPUs it makes no difference at all. And any difference it might make would likely be unmeasurable except in very specific circumstances.

Essentially, don't worry about it. If you have to ask then that means you can't perceive the difference, if any, anyway.
Post 17 Jun 2015, 15:14
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shutdownall



Joined: 02 Apr 2010
Posts: 518
Location: Munich
shutdownall
Hard to say - pusha would in first save code space and might save execution time as well as there is only one instruction to read but do to pipelining this might be without noticeable effect. Anyway it uses more stack space so if you don't need to save all registers it is better to select them.
Post 17 Jun 2015, 16:10
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