How to write fast code
There was a time, early in my programming career, when I needed to rewrite a particular program (a very small one) to make it run faster. I was quite new to programming and thought that the way to get something to run faster was to rewrite it in assembly. In those days, you could unroll a loop in assembly and pretty much count on getting a worthwhile speedup, if it was a tight loop to begin with.
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