I thought it was fairly clear 'q3k was referring to the 64 bit ISA introduced in amd64, not all the legacy stuff either kept around in some form for compatibili

I thought it was fairly clear 'q3k was referring to the 64 bit ISA introduced in amd64, not all the legacy stuff either kept around in some form for compatibility (x87, encodings) or stuff that isn't part of long mode (BCD, segmentation, real mode).