[HN Gopher] Revisiting the Fast Inverse Square Root - Is It Stil...
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       Revisiting the Fast Inverse Square Root - Is It Still Useful?
        
       Author : nhellman
       Score  : 15 points
       Date   : 2023-04-20 21:05 UTC (1 hours ago)
        
 (HTM) web link (hllmn.net)
 (TXT) w3m dump (hllmn.net)
        
       | thegeomaster wrote:
       | One important point that the article doesn't touch on is
       | determinism. rsqrtps is implemented differently on different
       | CPUs, and so if having reproducible floating point results is a
       | requirement (there's a lot of use-cases for this), you simply
       | cannot use it. Your only remaining option is to use a totally
       | IEEE-754 compliant algorithm that is guaranteed to work the same
       | on every CPU that implements IEEE-754 floats, and for that
       | there's still no better approach than using the Q_rsqrt idea, of
       | course with some modifications for the "modern age".
        
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       (page generated 2023-04-20 23:01 UTC)