Note that the 512-bit Larrabee instructions (on Knight's Ferry/Corner) had different encodings (and IIRC different encodings between KNF and KNC), but it was es

Note that the 512-bit Larrabee instructions (on Knight's Ferry/Corner) had different encodings (and IIRC different encodings between KNF and KNC), but it was essentially the same instruction set. The few differences there were between LRBNI and AVX-512 had (AFAIK) almost nothing to do with the move from the old Pentium in-order core to Silvermont. I think it's also safe to assume that, given the lead time to design an ISA and integrate it into an architecture (many years), the merging of AVX-512 into Skylake wasn't done "in a desperate attempt to give KL more software". These slides from Tom Forsyth provide lots of interesting background on the evolution of the instructions: http://tomforsyth1000.github.io/papers/LRBNI%20origins%20v4%20full%20fat.pdf http://tomforsyth1000.github.io/papers/LRBNI%20origins%20v4%...