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420 points gnabgib | 1 comments | 15 May 25 21:57 UTC | HN request time: 0.203s | source

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qingcharles ◴[15 May 25 22:22 UTC] No.43999955[source]▶

I love these incomprehensible magic number optimizations. Every time I see one I wonder how many optimizations like this we missed back in the old days when we were writing all our inner loops in assembly?

Does anyone have a collection of these things?

replies(4): >>43999992 #>>44000134 #>>44000173 #>>44000633 #

masfuerte ◴[15 May 25 22:26 UTC] No.43999992[source]▶

>>43999955 #

We didn't miss them. In those days they weren't optimizations. Multiplications were really expensive.

replies(6): >>44000045 #>>44001019 #>>44001612 #>>44001634 #>>44001978 #>>44008837 #

1. Someone ◴[16 May 25 19:08 UTC] No.44008837[source]▶

>>43999992 #

And branches were cheaper without pipelining

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