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I completely understand the desire to use the newer instructions and get the most performance possible out of the latest hardware, but we also should make it a

by gnu8 6y ago

I completely understand the desire to use the newer instructions and get the most performance possible out of the latest hardware, but we also should make it a priority to keep a portable C codepath in all of these libraries. Otherwise we’re going to find there are only two architectures left in the world because none of the software runs on anything else.

CJefferson 6y ago
There is a clean codepath, this is about setting the minimum CPU required for x86 -- there is a trade-off, we could make executables that will run on a 386, but it would be slow (particularly if multithreaded) due to later added instructions. Also, such old systems are little tested.