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Bit flipping
#24
RE: Bit flipping
(April 24, 2016 at 4:46 am)Cthulhu Dreaming Wrote:
(April 24, 2016 at 3:41 am)pocaracas Wrote: The craziest thing I've seen is the equivalent of a function call as a pre-compiler define. As long as you keep variable names consistent...it works.

These are common in C (specifically the gcc compiler) , and they work exactly the same as ordinary functions - by the time they go from thr pre-compiler to the compiler, they are ordinary functions.

What language/compiler are you talking about?
C++, it was.
And the purpose of it was to prevent function calls, added stack, and variable copying/passing.
We may think of those as "fast" events, but when every CPU cycle is precious, any trick is valid... Even if the CPU is an Octa-core, with hyperthreading and churning at some 3.6 GHz (a Xeon, I think it was).


Quote:The weirdest thing I've ever seen is everything written in Perl, ever, that was not used for listing rubbish. I have had to wrote - not by choice - far more Perl than I would wish to admit to.

I've only had to adapt a simple script in Perl, so I can't say much about it.
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Messages In This Thread
Bit flipping - by SteelCurtain - April 23, 2016 at 10:30 pm
RE: Bit flipping - by SteelCurtain - April 23, 2016 at 10:40 pm
RE: Bit flipping - by SteelCurtain - April 23, 2016 at 11:04 pm
RE: Bit flipping - by Jackalope - April 23, 2016 at 11:30 pm
RE: Bit flipping - by SteelCurtain - April 23, 2016 at 11:37 pm
RE: Bit flipping - by Jackalope - April 23, 2016 at 11:45 pm
RE: Bit flipping - by Tiberius - April 23, 2016 at 11:40 pm
RE: Bit flipping - by I_am_not_mafia - April 24, 2016 at 3:22 am
RE: Bit flipping - by SteelCurtain - April 23, 2016 at 11:42 pm
RE: Bit flipping - by Tiberius - April 23, 2016 at 11:55 pm
RE: Bit flipping - by SteelCurtain - April 24, 2016 at 12:01 am
RE: Bit flipping - by SteelCurtain - April 24, 2016 at 12:05 am
RE: Bit flipping - by Jackalope - April 24, 2016 at 1:19 am
RE: Bit flipping - by SteelCurtain - April 24, 2016 at 1:46 am
RE: Bit flipping - by ErGingerbreadMandude - April 24, 2016 at 3:04 am
RE: Bit flipping - by Jackalope - April 24, 2016 at 3:10 am
RE: Bit flipping - by ErGingerbreadMandude - April 24, 2016 at 3:22 am
RE: Bit flipping - by I_am_not_mafia - April 24, 2016 at 3:34 am
RE: Bit flipping - by pocaracas - April 24, 2016 at 3:41 am
RE: Bit flipping - by Jackalope - April 24, 2016 at 4:46 am
RE: Bit flipping - by pocaracas - April 24, 2016 at 5:42 am
RE: Bit flipping - by Jackalope - April 24, 2016 at 7:21 am
RE: Bit flipping - by pocaracas - April 24, 2016 at 7:38 am
RE: Bit flipping - by Jackalope - April 24, 2016 at 7:42 am
RE: Bit flipping - by I_am_not_mafia - April 24, 2016 at 7:28 am
RE: Bit flipping - by Jackalope - April 24, 2016 at 4:57 am
RE: Bit flipping - by I_am_not_mafia - April 24, 2016 at 4:03 am
RE: Bit flipping - by SteelCurtain - April 24, 2016 at 4:10 am
RE: Bit flipping - by Jackalope - April 24, 2016 at 7:25 am
RE: Bit flipping - by Jackalope - April 24, 2016 at 7:41 am
RE: Bit flipping - by Alex K - April 25, 2016 at 8:59 am
RE: Bit flipping - by J a c k - April 25, 2016 at 12:12 am
RE: Bit flipping - by bennyboy - April 25, 2016 at 8:09 am
RE: Bit flipping - by I_am_not_mafia - April 25, 2016 at 8:24 am
RE: Bit flipping - by bennyboy - April 26, 2016 at 4:56 am
RE: Bit flipping - by KevinM1 - April 26, 2016 at 9:52 am
RE: Bit flipping - by pocaracas - April 26, 2016 at 9:55 am
RE: Bit flipping - by SteelCurtain - April 25, 2016 at 8:12 am
RE: Bit flipping - by SteelCurtain - April 25, 2016 at 8:42 am
RE: Bit flipping - by Angrboda - April 25, 2016 at 10:38 am
RE: Bit flipping - by KevinM1 - April 25, 2016 at 10:32 pm
RE: Bit flipping - by bennyboy - April 26, 2016 at 4:48 am

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