=== make-0001: implicit.c pattern_search file->deps O(R×D×F) → O(R×D+F) ===
N=100   k=100  : defective=0.098ms  fixed=0.004ms  speedup=25.6x
N=500   k=500  : defective=2.529ms  fixed=0.023ms  speedup=112.0x
N=1000  k=1000 : defective=8.812ms  fixed=0.046ms  speedup=191.8x
N=2000  k=2000 : defective=35.410ms  fixed=0.097ms  speedup=363.3x

