https://www.techpowerup.com/268096/intel-sapphire-rapids-alder-lake-and-tremont-feature-cldemote-instruction
 
Intel's three upcoming processor microarchitectures, namely the next-generation Xeon "Sapphire Rapids," Core "Alder Lake," and low-power "Tremont" cores found in Atom, Pentium Silver, Celeron, and even Core Hybrid processors, will feature a new instruction set that aims to speed up processor cache performance, called CLDEMOTE "cache line demote." This is a means for the operating system to tell a processor core that a specific content of a cache (a cache line), isn't needed to loiter around in a lower cache level (closer to the core), and can be demoted to a higher cache level (away from the core); though not flushed back to the main memory.

There are a handful benefits to what CLDEMOTE does. Firstly, it frees up lower cache levels such as L1 and L2, which are smaller in size and dedicated to a CPU core, by pushing cache lines to the last-level cache (usually L3). Secondly, it enables rapid load movements between cores by pushing cache lines to L3, which is shared between multiple cores; so it could be picked up by a neighboring core. Dr. John McCalpin from UT Austin wrote a detailed article on CLDEMOTE.
 
It is good to see Intel push some new features into their CPUs. 
 

One can only hope it works as intended ... without the need for special code in OS or Apps
 
I would not be an early adapter ... until 3rd party reviews
 
New instruction sets - can be a game changer - getting more work per clock