[gmx-developers] lookup table in invsqrt algorithm

Haiqing Zhao haizhao at mtu.edu
Wed May 18 05:30:50 CEST 2011

Hello, all,

Does anybody know gmx_software_invsqrt work? I mean the algorithm. I found the code is in "vec.h" in "include" folder. But I have no idea of how lookup table is produced. There are two: exptab, and fracttab. It uses the space very well. 
I hope you could give me some hint.


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