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ok mentioning Go here is a bit pointless. How did Go help compared to any other language when Arm has hardware instructions for SHA1&2?

Go didn't help specifically, it is just that this package makes support for the ARM SHA instructions available for Golang.

Also Go has support for using assembly in a package natively, not all languages/build tools support that as easily.

It is pretty common in imperative compiled languages.

Back when compilers were sold, the professional version always had an assembler in the box.

In MS-DOS even BASIC compilers like Turbo Basic could use inline Assembly.