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No performance improvements with -Ctarget-feature=+neon on arm64 #360

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@Slixe

Hey there, thanks for this amazing repo!

I'm currently using chacha20 crate, unfortunately, on arm64 CPU I'm getting poor performances with and without -Ctarget-feature=+neon.

test chacha12_bench1_16b   ... bench:          34.15 ns/iter (+/- 1.03) = 470 MB/s
test chacha12_bench2_256b  ... bench:         417.99 ns/iter (+/- 16.83) = 613 MB/s
test chacha12_bench3_1kib  ... bench:       1,653.14 ns/iter (+/- 39.99) = 619 MB/s
test chacha12_bench4_16kib ... bench:      26,417.67 ns/iter (+/- 919.50) = 620 MB/s
test chacha20_bench1_16b   ... bench:          48.31 ns/iter (+/- 0.44) = 333 MB/s
test chacha20_bench2_256b  ... bench:         704.38 ns/iter (+/- 53.47) = 363 MB/s
test chacha20_bench3_1kib  ... bench:       2,710.32 ns/iter (+/- 109.84) = 377 MB/s
test chacha20_bench4_16kib ... bench:      43,389.69 ns/iter (+/- 2,237.09) = 377 MB/s
test chacha8_bench1_16b    ... bench:          26.71 ns/iter (+/- 2.61) = 615 MB/s
test chacha8_bench2_256b   ... bench:         284.31 ns/iter (+/- 12.14) = 901 MB/s
test chacha8_bench3_1kib   ... bench:       1,121.32 ns/iter (+/- 50.64) = 913 MB/s
test chacha8_bench4_16kib  ... bench:      17,929.43 ns/iter (+/- 378.40) = 913 MB/s

Am I missing something ? Thanks in advance :)

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