Intrinsified:

BigIntegerBench.mulAddReflect       1  avgt   15    214.829 ?   22.709  ns/op
BigIntegerBench.mulAddReflect       2  avgt   15    235.038 ?   26.962  ns/op
BigIntegerBench.mulAddReflect       3  avgt   15    214.684 ?   23.101  ns/op
BigIntegerBench.mulAddReflect      10  avgt   15    240.880 ?   11.972  ns/op
BigIntegerBench.mulAddReflect      50  avgt   15    440.064 ?   17.343  ns/op
BigIntegerBench.mulAddReflect      90  avgt   15    612.543 ?    4.086  ns/op
BigIntegerBench.mulAddReflect     127  avgt   15    781.737 ?    3.442  ns/op

Benchmark                      (size)  Mode  Cnt      Score      Error  Units
BigIntegerBench.squareReflect       1  avgt   15    224.780 ?   20.491  ns/op
BigIntegerBench.squareReflect       2  avgt   15    229.311 ?    4.700  ns/op
BigIntegerBench.squareReflect       3  avgt   15    301.360 ?   46.147  ns/op
BigIntegerBench.squareReflect      10  avgt   15    514.199 ?   27.243  ns/op
BigIntegerBench.squareReflect      50  avgt   15   5725.361 ?  690.341  ns/op
BigIntegerBench.squareReflect      90  avgt   15  19007.412 ? 2287.869  ns/op
BigIntegerBench.squareReflect     127  avgt   15  42171.089 ?   82.404  ns/op


Intrinsic large size:
Benchmark                      (size)  Mode  Cnt          Score         Error  Units
BigIntegerBench.mulAddReflect    1000  avgt    5       4760.160 ?      10.336  ns/op
BigIntegerBench.mulAddReflect  100000  avgt    5     573525.959 ?      33.647  ns/op
BigIntegerBench.squareReflect    1000  avgt    5    1021131.451 ?   40275.951  ns/op
BigIntegerBench.squareReflect  100000  avgt    5  969070374.000 ? 8465248.858  ns/op



No intrinsic:

Benchmark                      (size)  Mode  Cnt      Score     Error  Units
BigIntegerBench.mulAddReflect       1  avgt   15    225.186 ?  31.287  ns/op
BigIntegerBench.mulAddReflect       2  avgt   15    223.470 ?  21.344  ns/op
BigIntegerBench.mulAddReflect       3  avgt   15    220.824 ?  22.967  ns/op
BigIntegerBench.mulAddReflect      10  avgt   15    258.655 ?  20.553  ns/op
BigIntegerBench.mulAddReflect      50  avgt   15    500.343 ?  13.403  ns/op
BigIntegerBench.mulAddReflect      90  avgt   15    728.796 ?   2.045  ns/op
BigIntegerBench.mulAddReflect     127  avgt   15    944.195 ?   1.880  ns/op

BigIntegerBench.squareReflect       1  avgt   15    232.179 ?  18.907  ns/op
BigIntegerBench.squareReflect       2  avgt   15    264.906 ?   4.892  ns/op
BigIntegerBench.squareReflect       3  avgt   15    317.821 ?   9.263  ns/op
BigIntegerBench.squareReflect      10  avgt   15    889.980 ?  11.022  ns/op
BigIntegerBench.squareReflect      50  avgt   15   9598.950 ?  29.988  ns/op
BigIntegerBench.squareReflect      90  avgt   15  27682.028 ?  52.980  ns/op
BigIntegerBench.squareReflect     127  avgt   15  52560.296 ? 246.861  ns/op

No intrinsic large size:

Benchmark                      (size)  Mode  Cnt           Score          Error  Units
BigIntegerBench.mulAddReflect    1000  avgt    5        6031.718 ?       14.128  ns/op
BigIntegerBench.mulAddReflect  100000  avgt    5      702526.121 ?     1843.448  ns/op
BigIntegerBench.squareReflect    1000  avgt    5     1318325.424 ?    38074.841  ns/op
BigIntegerBench.squareReflect  100000  avgt    5  1245027258.000 ? 82365708.239  ns/op