On Sat, Jan 9, 2016 at 9:48 AM, Tony Luck [off-list ref] wrote:

On Fri, Jan 8, 2016 at 5:49 PM, Andy Lutomirski [off-list ref] wrote:

quoted

On Jan 8, 2016 4:19 PM, "Tony Luck" [off-list ref] wrote:

quoted

Make use of the EXTABLE_FAULT exception table entries. This routine
returns a structure to indicate the result of the copy:

Perhaps this is silly, but could we make this feature depend on ERMS
and thus make the code a lot simpler?

ERMS?

It's the fast string extension, aka Enhanced REP MOV STOS.  On CPUs
with that feature (and not disabled via MSR), plain ol' rep movs is
the fastest way to copy bytes.  I think this includes all Intel CPUs
from SNB onwards.

--Andy

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