Benchmark results on my machine (Core i5-4200M):
running 25 tests
test check ... ignored
test test_fast_newlines ... bench: 2,175 ns/iter (+/- 620)
test test_fast_nonewlines ... bench: 2,176 ns/iter (+/- 344)
test test_fast_random ... bench: 32,466 ns/iter (+/- 983)
test test_fast_somenewlines ... bench: 16 ns/iter (+/- 2)
test test_faster_newlines ... bench: 2,940 ns/iter (+/- 527)
test test_faster_nonewlines ... bench: 2,938 ns/iter (+/- 956)
test test_faster_random ... bench: 43,954 ns/iter (+/- 1,720)
test test_faster_somenewlines ... bench: 25 ns/iter (+/- 5)
test test_fastest_newlines ... bench: 1,286 ns/iter (+/- 167)
test test_fastest_nonewlines ... bench: 1,284 ns/iter (+/- 383)
test test_fastest_random ... bench: 19,039 ns/iter (+/- 5,534)
test test_fastest_somenewlines ... bench: 14 ns/iter (+/- 3)
test test_hyperscreaming_newlines ... bench: 716 ns/iter (+/- 90)
test test_hyperscreaming_nonewlines ... bench: 712 ns/iter (+/- 239)
test test_hyperscreaming_random ... bench: 10,901 ns/iter (+/- 492)
test test_hyperscreaming_somenewlines ... bench: 12 ns/iter (+/- 2)
test test_screaming_newlines ... bench: 1,180 ns/iter (+/- 258)
test test_screaming_nonewlines ... bench: 1,180 ns/iter (+/- 140)
test test_screaming_random ... bench: 17,565 ns/iter (+/- 740)
test test_screaming_somenewlines ... bench: 10 ns/iter (+/- 3)
test test_slow_newlines ... bench: 5,698 ns/iter (+/- 814)
test test_slow_nonewlines ... bench: 3,704 ns/iter (+/- 797)
test test_slow_random ... bench: 67,856 ns/iter (+/- 2,345)
test test_slow_somenewlines ... bench: 31 ns/iter (+/- 2)
I should note that this machine does have POPCNT, though it does not appear to make any difference.
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