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Instruction Distillation

Technique

**Instruction distillation** is a technique for reducing the length of instruction sequences used as inputs in RTL-level hardware fuzzing while preserving their usefulness for bug detection and coverage exploration. In the context of the RTL fuzzer **INSTILLER**—short for *Instruction Distiller*—instruction distillation is used to keep fuzzing inputs short because prior CPU fuzzing approaches can generate increasingly long RTL instruction inputs, and longer inputs may be ineffective for fuzzing.[^1]

First seen 5/24/2026
Last seen 5/26/2026
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WIKI

Instruction Distillation

Instruction distillation is a technique for reducing the length of instruction sequences used as inputs in RTL-level hardware fuzzing while preserving their usefulness for bug detection and coverage exploration. In the context of the RTL fuzzer INSTILLER—short for Instruction Distiller—instruction distillation is used to keep fuzzing inputs short because prior CPU fuzzing approaches can generate increasingly long RTL instruction inputs, and longer inputs may be ineffective for fuzzing.[1]

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INSTILLER ← uses 100% 3e
INSTILLER distills input instructions using VACO to keep input length short.