Extended MMX

Extended MMX refers to one of two possible extensions to the MMX instruction set for x86.

Intel Extended MMX

Included in Intel's Streaming SIMD Extensions were a number of new instructions that extended the functionality of MMX. AMD incorporated this subset of extended MMX instructions into the Athlon microarchitecture. These instructions are commonly known as "Extended MMX instructions".

These instructions debuted in May 1999, in the Intel Pentium III Processor, as part of the SSE instruction set. Next month, in late June 1999, AMD's Athlon processor was released which featured the extended MMX instructions, but not SSE.

Today, these extended MMX instructions are notable as being the common subset of MMX extensions that work across both AMD Athlon and SSE-capable Intel processors.[1]

Cyrix EMMI (Extended Multi-Media Instructions)

Less commonly known, "Extended MMX" could also refer to the original Cyrix EMMI (Extended Multi-Media Instructions). This instruction set was developed by Cyrix and implemented on their 6x86 MX and MII line of processors. It extended the MMX instruction set with 12 new instructions useful in multimedia applications. The extensions were not enabled by default, requiring the BIOS or software to enable them. EMMI was never given much support from software developers or acknowledged by Cyrix's competitors (certain Intel SSE instructions even share opcodes with EMMI instructions). It was never implemented in any processors after the MII. The EMMI instruction set included:

  • paddsiw
  • paveb
  • pdistib
  • pmachriw
  • pmagw
  • pmulhrw
  • pmulhriw
  • pmvzb
  • pmvnzb
  • pmvlzb
  • pmvgezb
  • psubsiw

References

  1. ^ Wright, Christopher (January 2004). "AMD MMX Extensions". AMD MMX Extensions. Retrieved 23 March 2013.

Content Disclaimer

Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.

  1. The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
  2. There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
  3. It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
  4. Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
  5. Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.