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Bitshift performance vs 64bit numbers #109

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bc99 opened this issue Nov 13, 2013 · 4 comments
Closed

Bitshift performance vs 64bit numbers #109

bc99 opened this issue Nov 13, 2013 · 4 comments

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@bc99
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@bc99 bc99 commented Nov 13, 2013

Every number is stored with 64bit, except you are doing bit shifting. Then javascript stores the number into a 32bit integer. The result of this: You get negative or just wrong numbers when you are shifting a big js-representing integer.
If you really think bit shift is a good way to improve performance, make sure the numbers are not bigger than 32 bit.

@serbanghita
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@serbanghita serbanghita commented Nov 14, 2013

@tbcm interesting, maybe you should provide some examples for the guide

@bc99
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@bc99 bc99 commented Nov 14, 2013

I had found a good website about this a few weeks ago, because I ran into this issue. I cannot find it anymore, but here is a stackoverflow link:
http://stackoverflow.com/questions/2373791/bitshift-in-javascript

At the moment I'm very busy, so I cannot create an example. I just thought it would be good to know.

@hshoff
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@hshoff hshoff commented Nov 14, 2013

Ah! Thanks for pointing this out. 🍻

@hshoff hshoff closed this in 8bab767 Nov 14, 2013
@serbanghita
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@serbanghita serbanghita commented Nov 14, 2013

🍻 thank you!

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