The following instructions are considered to be processor supplementary instructions on IA-32 architecture. These instructions were added to later production processors, and are not part of the original IA-32 instruction set. Programs containing these instructions may not operate correctly on all machines in the IA-32 family:
Read more about this topic: Processor Supplementary Capability, Supplementary Capabilities Not Represented By Flags, Processor Supplementary Instructions
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... The IA-32 instruction set was introduced in the Intel 80386 microprocessor in 1986 and remains the basis of most PC microprocessors over twenty years later ... various programming language directives, IA-32 is still sometimes referred to as the "i386" architecture ... continues to produce the VIA C3/VIA C7 family of "pure" IA-32 devices ...