Right, but SSE3 ain't the least denominator of x86_64 at all.
Early AMD64 chips (3 to 5 years old) doesn't support SSE3 as x86_64
predates SSE3. You can safely assume that all AM2 socket based chips are
SSE3 enabled.
I do agree perfectly with you, however, SSE3 capability can definitely be queried by checking the presence of flag pni (Prescott New Instructions) in /proc/cpuinfo.
AMD cores Sledgehammer (steppings C0, CG) and Clawhammer (stepping CG) do not support SSE3 only cores from San Diego (stepping E4) on. ~C
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