CPU bug detection is the task of identifying defects in processor hardware before deployment. The provided evidence discusses it through RTL fuzzing, focusing on limitations of prior CPU RTL fuzzers and on INSTILLER, a proposed fuzzer that shortens instruction inputs via a variant of ant colony optimization (VACO), models multiple interruptions and exceptions more realistically, and uses hardware-based seed selection and mutation. Reported results include higher coverage, shorter inputs, more detected mismatches, and increased execution speed relative to prior work such as DiFuzzRTL.

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