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Query regarding cmpxchg16b instruction for i386


Hi All,
In gcc, cmpxchg16b instruction is included as part of ISA CX16.
In binutils, same instruction is included as part of ISA SSE3 (Ref. opcodes/i386-opc.tbl) and there is no CX16 ISA
I could find lot of references  for cmpxchg16b being part of CX16 ISA but not SSE3
Can somebody throw some light on this?
Regards,
Saravanan



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