Are you looking for stuff like this?AMD Athlon™ XP Processor Tech Docs
Article #22007 AMD Athlon™ Processor x86 Code Optimization Guide.
Article #22466 AMD Extensions to the 3DNow! and MMX Instruction Sets.
Article #22621 3DNow!™ Instruction Porting Guide Application Note.
You may also be able to directly contact AMD at there official website.
Hope that helps or at least points you into the right direction
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