Optimize fuzzing using targeted substitution #77
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This PR improves performance by optimizing the substitution algorithm in the fuzzer. Substitutions now target only the
<program>cell via thesubst_funcparameter infuzz. This prevents the substitution from needlessly traversing these large terms, leading to a 3x speedup in fuzzing.The speedup was measured using the existing test suite, particularly the FxDAO tests. In cases where the initial state is larger—such as tests involving multiple contracts or bigger contracts—the performance improvement is even more significant.