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Other articles > X86 Glossary > eXtended Operations instructions (XOP)

The XOP (eXtended Operations[1]) instruction set, announced by AMD on May 1, 2009, is an extension to the 128-bit SSE core instructions in the x86 and AMD64 instruction set for the Bulldozer processor core, which was released on October 12, 2011.[2] However AMD removed support for XOP from Zen (microarchitecture) onward.[3] The XOP instruction set contains several different types of vector instructions since it was originally intended as a major upgrade to SSE. Most of the instructions are integer instructions, but it also contains floating point permutation and floating point fraction extraction instructions.

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