On Tue, Jul 23, 2019 at 07:52:09AM -0700, Andrew Lutomirski wrote: > Things like CMPXCHG16B that change the set of things that can be done on > the CPU. I could easily imagine programs that use algorithms that > fundamentally depend on CMPXCHG16B. There is no drop-in replacement.
FWIW, CMPXCH16B is a hard requirement for Windows 8.1 (August 2013!) and beyond. In AMD-land, it seems that CMPXCHG16B support was added at the same time as they added SSE3 (ie April 2005). so requiring that would cut off the 1st-gen single-core x86_64 AMD parts) All non-AMD x86_64 parts support both CMPXCHG16B and SSE3. - Solomon -- Solomon Peachy pizza at shaftnet dot org High Springs, FL ^^ (email/xmpp) ^^ Quidquid latine dictum sit, altum videtur.
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