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Re:x86-64 Assembly Language Programming with Ubuntu by tyingq on Friday August 31, 2018 @11:49AM (#17886523)
Lots of reasons, but one would be processor specific optimizations and/or extensions for performance reasons.

OpenSSL, for example, has a fair amount of ASM in it for various processors to speed things up.

See https://software.intel.com/en-us/articles/improving-openssl-... for some examples of what they specifically did for x86/64.

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