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2019
833

Bring Back the SE

Today Apple is going to announce three new iPhones. One of them should be a small form factor like the old SE. Apple discontinued the iPhone SE at the tail end of 2018 and has stated that the next iOS update will not run on the old SE hardware. I have a number of friends […]

836

Why Positive Cashflow Matters

Venture backed companies have a strange relationship to positive cashflow. Because they have financial backers who can and do finance losses, they tend to operate in the red for a long time. In the early days it makes sense to burn cash. If you do not have revenues, you can’t generate cash. And if you […]

840

Popcount CPU instruction

Most CPU architectures in use today have an instruction called popcount , short for “population count”. Here’s what it does: it counts the number of set bits in a machine word. For example (assuming 8-bit words for simplicity), popcount(00100110) is 3 and popcount(01100000) is 2 .