Relevant to which processors go supports, is this section (1). Base x64 support includes SSE and SSE2. I don't know if the go compiler produces it, though. Unlike extremely complex compilers like gcc, where performance is the top priority, the go compiler favours simplicity in a Wirthian(2) fashion favouring a simple, fast compiler.
(1) https://go.dev/wiki/MinimumRequirements#amd64
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