[prev in list] [next in list] [prev in thread] [next in thread] 

List:       kde-core-devel
Subject:    Re: Krazy: prefix vs. postfix ++ and -- operators
From:       Rafał Miłecki <zajec5 () gmail ! com>
Date:       2011-01-11 15:26:48
Message-ID: AANLkTingNE2DdC3dKta3sD7sZVS=-8dqevcnbPca7Xr2 () mail ! gmail ! com
[Download RAW message or body]

W dniu 11 stycznia 2011 16:25 użytkownik Rafał Miłecki
<zajec5@gmail.com> napisał:
> 2011/1/11 Christoph Feck <christoph@maxiom.de>:
>> Krazy says:
>>
>> "You should use ++ and -- as prefix whenever possible as these are more
>> efficient than postfix operators. Prefix increments first and then uses the
>> variable, postfix uses the actual; the variable is incremented as well.
>> Because of this, the prefix operators are inherently more efficient."
>>
>> Considering that today's CPUs have multiple pipelines, using a value directly
>> seems faster to me than waiting for it to be incremented or decremented.
>>
>> Is this krazy warning still correct?
>
> Doesn't compiler optimize than anyway, when possible (like inside
> for)? I was told that when I tried using post incr. in kernel.

It should be "when I tried using pre incr. in kernel."

-- 
Rafał

[prev in list] [next in list] [prev in thread] [next in thread]