cpu flags

[vinceASPECT]

Hello Forum,

is it true to say you would NOT need to use earlier flags on some terminal command if you have something more up to date

so using say  "sse4.2"  you'd not bother following that with a flag like  "sse4.1"  and  "sse3"  and "sse2"

or do you use them ALL....and in the most recent hierarchy of  order?......as i listed

thanks
C

[curaga]

They are independent, and sometimes newer cpus drop support for older ones. So it's indeed possible to enable sse4.2 while not enabling sse2, for example.

[vinceASPECT]

i mean if i see the list of FLAGS my cpu supports
and the list of flags supported by an app

must i still need to enable them ALL when typing a terminal command in the app
or should i just list the latest flags

 ( e.g.  sse4.2  superseded sse2....?... so although all  lists contain them both.......... don't type  "sse4.2+sse2" ..... just type "sse4.2"........)

Thx
C