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Re: Time for little quiz! [message #2267 is a reply to message #2265]

Wed, 05 April 2006 14:56

mirek
Messages: 14256
Registered: November 2005

Ultimate Member

victorb wrote on Wed, 05 April 2006 08:52

Interesting to see that none of the 3 suggested solution generate a conditional jump... they make use of the "setne" opcode...
I don't have the cycle count for each instruction but it might be as optimal as "(-q >> 31) & 1" with the benefit of being understandable.

-> I vote for coloccount += (q != 0);

Victor

"setne" is a good point. However, it does not seem to be used with all compilers on all CPUs.... (but I guess it would deserve the conditional compilation at least).

Mirek

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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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