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It seemed to me that some Xeons had those since 2014. See https://software.intel.com/en-us/isa-extensions/intel-sha https://software.intel.com/en-us/isa-extensi
by kalden_ 10y ago
It seemed to me that some Xeons had those since 2014. See https://software.intel.com/en-us/isa-extensions/intel-sha https://software.intel.com/en-us/isa-extensions/intel-sha
Should something be understood instead?
- mrb 10y agoHuh you seem right. Only the multi-socket Haswell seems to have them (E7-xxxxv3 and E5-26xxv3). And now Intel re-introduce the SHA instructions in some low-power low-end CPUs, but not for any desktop or single-socket server CPU? What a bizarre case of feature fragmentation. Typical Intel.
- pbsd 10y agoI think even Intel is confused about their own extensions at this point. The E7 and E5 Xeons are Haswell systems that slightly speed up SHA-256 and 512 with the introduced BMI2 RORX instruction. As far as I know there are no SHA extensions before Goldmont, as mrb said, and in Cannonlake for non-low-power chips.