Geode instruction set

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see Hardware specification and AMD's Geode GX data book

The Geode's instruction set is a mix of several instruction sets. As per data book (2.1 - CPU Core, pg.15):

General

Generally speaking, the Geode GX is a combination the following instruction sets:

  • Intel's Pentium(r)
  • AMD-K6(r)
  • Athlon(tm) FPU
  • AMD Geode Castle

Specific Instruction Sets

In particular (and from AMD's documentation) it supports the following instruction sets:

  • Pentium
  • Pentium Pro
  • 3DNow! (AMD-K6 and Athlon processors)
  • MMX (Athlon processors)
  • subset of Geode Castle (including special SMM instructions)
  • does not support the full set of Katmai New Instruction (KNI) (as implemented in Pentium 3)
  • does support MMX for Athlon (itself a subset of Pentium 3 KNI)