Is 386 still supported?
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By who? Windows won't run on it (except versions like win95 and NT3.5) so whether windows software is still compiled with 386 compatibility (it isn't) is kind of a moot question. Even Linux doesn't support it anymore, as of 3.8. The demand for it dropped to zero a decade ago, and the support required a significant amount of "stuff that's only there because of a processor that no one uses".
Wojciech Lisik wrote:
I know i586/686 is patched to all new software.
That isn't really true either. There is absolutely software out there that doesn't have a fallback in case SSE2 isn't supported, and it's often (incorrectly) still called "i686 compatible". Requiring higher versions of SSE is becoming a thing too, and it's only going to get more widespread.