> No product segment has ever regressed AVX feature support under Intel (other than the obvious rugpull at the end with Alder Lake). You can really extend this

> No product segment has ever regressed AVX feature support under Intel (other than the obvious rugpull at the end with Alder Lake). You can really extend this a bit further: very few x86 ISA features have been dropped by newer processors. The complete list of such features as of Raptor Lake is MPX, TSX (including hardware lock elision), SGX, Branch Monitoring Counters, and Power Aware Interrupt Routing, with an additional asterisk on AVX-512. There is also talk of a future processor dropping support for 16-bit stuff so that you can no longer run Windows 3.1 on your machine without full-on emulation. The asterisk with AVX-512 is that processors with P cores and E cores don't support AVX-512, whereas the P core lineage did support AVX-512 (and in early Alder Lake steppings, you could enable support for AVX-512 if you disabled all the E cores).