I removed the redirect to the SSSE3 talk page. SSE4 is different from SSSE3.
SSE4 talk at IDF Beijing 2007 revealed everything; I'm filling in the tables now Fivemack 15:09, 16 April 2007 (UTC)
I don't think it's strictly true that POPCNT shares the opcode for the x86-on-ia64 JMPE. It depends on how you define "opcode" I guess. POPCNT has a mandatory F3 prefix, which differentiates it from JMPE.
POPCNT has it's own primay opcode, those two instructions simply share the same mandatory prefix. I'm studying this vigorously, so I had to say something. ChazZeromus (talk) 16:36, 6 September 2009 (UTC)