Comments on: Code tuning techniques http://www.mxml.it/index.php/2009/10/04/code-tuning-techniques/ avoid mickey mouse programming Tue, 05 Jul 2011 03:54:36 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Giorgio Natili http://www.mxml.it/index.php/2009/10/04/code-tuning-techniques/comment-page-1/#comment-4304 Giorgio Natili Mon, 04 Jan 2010 01:17:26 +0000 http://www.mxml.it/index.php/2009/10/04/code-tuning-techniques/#comment-4304 Hi Alessandro, I agree with you and thanks for the comment, I believe it can help a lot this small blog... Hi Alessandro,

I agree with you and thanks for the comment, I believe it can help a lot this small blog…

]]> By: Alessandro Bianco http://www.mxml.it/index.php/2009/10/04/code-tuning-techniques/comment-page-1/#comment-4232 Alessandro Bianco Thu, 17 Dec 2009 09:25:13 +0000 http://www.mxml.it/index.php/2009/10/04/code-tuning-techniques/#comment-4232 it's worth to say that the bit operations (like value >> 1) are meant to work on integers and return s only integes. So if you try to (3 >> 1) you will get 1 as a result. Also they do a "awful" (just because it can be unexpected) job at rounding for negative numbers. (-3 >> 1 == 2). For the same reason using int(-1.5) in place of the floor() method will give you wrong results. In my opinion, you should be really confident about what kind of data you are working with and what kind of results you need before switching to bit operations. it’s worth to say that the bit operations (like value >> 1) are meant to work on integers and return s only integes.
So if you try to (3 >> 1) you will get 1 as a result.
Also they do a “awful” (just because it can be unexpected) job at rounding for negative numbers. (-3 >> 1 == 2).
For the same reason using int(-1.5) in place of the floor() method will give you wrong results.

In my opinion, you should be really confident about what kind of data you are working with and what kind of results you need before switching to bit operations.

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