Arduino UNO R3
IDE 1.8.19

fastShiftIn_test.ino
0.4.1

 8 bits HIGH


Performance - time in us : read()
FastShiftIn1: 13.96
FastShiftIn2: 26.66
       Delta: 12.70


Performance - time in us : read16()
FastShiftIn1: 26.16
FastShiftIn2: 51.56
       Delta: 25.40


Performance - time in us : read24()
FastShiftIn1: 39.88
FastShiftIn2: 78.97
       Delta: 39.10


Performance - time in us : read32()
FastShiftIn1: 52.20
FastShiftIn2: 103.62
       Delta: 51.42


Performance - time in us : readLSBFIRST()
FastShiftIn1: 12.83
FastShiftIn2: 24.77
       Delta: 11.94


Performance - time in us : readMSBFIRST()
FastShiftIn1: 12.82
FastShiftIn2: 24.77
       Delta: 11.95


Performance - time in us : reference shiftIn()
Standard shiftIn1: 108.98
Standard shiftIn2: 217.04
            Delta: 108.06

done...
