3DNow! extension

Concept

3DNow! is an x86 instruction set extension that, according to a study on differential testing of instruction decoders, the GNU decoder only incompletely deprecated, illustrating the challenges that ISA extensions pose for decoder maintenance.

First seen 7/30/2026

Last seen 7/30/2026

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Overview

3DNow! is an extension of the x86 instruction set architecture. It is referenced in academic literature that examines the complexity of modern instruction sets and the challenges of building correct instruction decoders.

Status as an x86 Extension

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x86 Architecture part of → 90% 1e

3DNow! is an extension to the x86 instruction set.

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CITATIONS

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[1] 3DNow! is one of at least 13 extensions to the x86 instruction set architecture, which has accumulated hundreds of opcodes since its creation. Structured Random Differential Testing of Instruction Decoders

[2] Extensions such as 3DNow! can produce new interactions between opcodes and operands that affect existing instructions, requiring decoders to be updated accordingly. Structured Random Differential Testing of Instruction Decoders

[3] The GNU decoder incompletely deprecated 3DNow!, an issue observed during differential testing of instruction decoders. Structured Random Differential Testing of Instruction Decoders