[mjevans]

I recalled there were some new instructions added that greatly help with this. Unfortunately I'm not finding any good _webpages_ that describe the operation generally to give me a good overview / refresher. Everything seems to either directly quote published PDF documents or otherwise not actually present the information in it's effective for end use form. E.G. https://www.felixcloutier.com/x86/ -- However availability is problematic for even slightly older silicon https://en.wikipedia.org/wiki/X86-64

- XSAVE / XRSTOR

- XSAVEOPT / XRSTOR

- XSAVEC / XRSTOR

- XSAVES / XRSTORS

[Joker_vD]

Eh, pretty much nobody uses them (outside of OS kernels?); and mind you, RISC-V with its 32 registers has nothing similar to those, which is why 14-instruction long prologues (adjust sp, save lr and s0 through s12) and epilogues are not that uncommon there.