perf(circuit): optimize digest constraints from O(n²) to O(n) #2510
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What
Optimizes digest constraint generation in
compress.rsfrom O(n²) to O(n) by computing a single non-zero flag instead of checking each element against all elements.Why
The previous implementation created 1088 constraints (32×32 + 8×8) for digest validation, significantly increasing proof size and verification time. The optimized version reduces this to 40 constraints (32 + 8) while maintaining the same correctness guarantees. Also fixes compilation errors where arrays were moved and then accessed again.