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Thread: What does mmx, gs & fs do?

  1. Oct 6th, 2002, 06:04 PM #1
    AirScape17
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    What does mmx, gs & fs do?

    umm..... what do these registers do exactly?
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  2. Oct 12th, 2002, 08:58 AM #2
    CornedBee
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    MMX is an extension to CPUs to speed up some calculations that are used heavily whendoing multimedia. It consists of special instructions and a set of special registers (I think some CPUs share floating point and MMX registers).

    fs and gs are segment registers, like cs, ss, ds and es. Like es they are general purpose segment registers and can be used for anything, while cs is reserved for code, ss is reserved for the stack, and ds is reserved for data. In reality ds, es, fs and gs all are only used for data.
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