HTTP is in a similar sorry state. For example, it offers pipelining support but nobody can reliably use it because it probably won't work on some forgotten about machine somewhere on the path.
-4 karma · joined January 28, 2020
https://github.com/alphagov/notifications-api/blob/e386d2ac3...
I'd like to clarify that the remark about load handling was aimed at your SMS gateway providers.
And yes, everyone in the industry knows that ads don't work, you have all the ad blockers, etc.
gcc/clang offers builtins for most of these. And if you give the compiler the right march parameter it'll quite likely turn your hand-rolled code for these operations into the x64 instruction you're targeting. Try it on Compiler Explorer.