On Thu, 2 Feb 2017, Konstantin Belousov wrote:
On Fri, Feb 03, 2017 at 05:14:15AM +1100, Bruce Evans wrote:
You won't want to ifdef this for SMP, so the i386 implementation has
further bugs like I expected (fcmpset is not implemented in the
CPU_DISABLE_CMPXCHG case).
I think it is time to remove the option. It certainly outlived it
usefulness:
... VmWare 3.x seems to emulate this instruction poorly, causing
the guest OS to run very slowly. This problem appears to be fixed in
VmWare 4.x, at least in version 4.5.2 ...
Yes, it is probably not useful.
Similarly for many old i386 options like NPX and SSE. NPX might as well
be mandatory, and SSE always there but dynamically configured as it is
now.
Bruce
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