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Re: Time for little quiz! [message #2271 is a reply to message #2269]

Wed, 05 April 2006 15:50

hojtsy is currently offline

hojtsy
Messages: 241
Registered: January 2006
Location: Budapest, Hungary

Experienced Member

victorb wrote on Wed, 05 April 2006 09:04

I remove my vote for "colorcount += (q != 0)" adding an int with a boolean is not so nice...

At least it has standard-defined behaviour, which is an improvement over shifting negative numbers.

victorb wrote on Wed, 05 April 2006 09:04

And I propose suggested #4: "colorcount += (q)?1:0;" (this will generate the same code as #3 with GCC).

You don't really need parenthesis there: "colorcount += q ? 1 : 0;" First I thought that this variant may generate a branch.

victorb wrote on Wed, 05 April 2006 09:04

Funny to see how many post such a small statement "(-q >> 31) & 1" could generate Razz

Razz

I think that the big challenge is not to write fast & obfuscated code, but rather write fast and clean code. This example is small enough to test whether this is possible in C if you take the "fast" aspect to the extreme. I see the obfuscated version as practically assembly magic, even if it is written with C statements: the question is whether there is a C++ standard-conformant solution with the same or better runtime performance.

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[Message index]

		Time for little quiz! By: mirek on Tue, 04 April 2006 14:02
		Re: Time for little quiz! By: unodgs on Tue, 04 April 2006 19:12
		Re: Time for little quiz! By: gprentice on Wed, 05 April 2006 12:31
		Re: Time for little quiz! By: fudadmin on Tue, 04 April 2006 20:04
		Re: Time for little quiz! By: mirek on Tue, 04 April 2006 20:36
		Re: Time for little quiz! By: victorb on Wed, 05 April 2006 10:21
		Re: Time for little quiz! By: mirek on Wed, 05 April 2006 10:53
		Re: Time for little quiz! By: mirek on Wed, 05 April 2006 10:54
		Re: Time for little quiz! By: gprentice on Wed, 05 April 2006 11:20
		Re: Time for little quiz! By: mirek on Wed, 05 April 2006 12:04
		Re: Time for little quiz! By: hojtsy on Wed, 05 April 2006 14:26
		Re: Time for little quiz! By: victorb on Wed, 05 April 2006 14:52
		Re: Time for little quiz! By: mirek on Wed, 05 April 2006 14:56
		Re: Time for little quiz! By: victorb on Wed, 05 April 2006 15:04
		Re: Time for little quiz! By: hojtsy on Wed, 05 April 2006 15:50
		Re: Time for little quiz! By: mirek on Wed, 05 April 2006 17:42
		Re: Time for little quiz! By: mirek on Wed, 05 April 2006 14:53
		Re: Time for little quiz! By: gprentice on Thu, 06 April 2006 14:29
		Re: Time for little quiz! By: mirek on Thu, 06 April 2006 15:56
		Re: Time for little quiz! By: victorb on Thu, 06 April 2006 16:17
		Re: Time for little quiz! By: mirek on Thu, 06 April 2006 16:25
		Re: Time for little quiz! By: nixnixnix on Tue, 02 September 2008 00:04
		Re: Time for little quiz! By: mirek on Tue, 02 September 2008 08:56
		Re: Time for little quiz! By: nixnixnix on Tue, 02 September 2008 21:54
		Re: Time for little quiz! By: mirek on Wed, 03 September 2008 14:18
		Re: Time for little quiz! By: nixnixnix on Wed, 03 September 2008 16:38
		Re: Time for little quiz! By: mrjt on Wed, 03 September 2008 16:51
		Re: Time for little quiz! By: mirek on Sun, 07 September 2008 10:12
		Re: Time for little quiz! By: gprentice on Wed, 05 April 2006 12:23
		Re: Time for little quiz! By: mirek on Wed, 05 April 2006 13:14

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