Very Fast HTTP Paser - Totemo-Hayai (とても速い) HTTP Parser

Benchmark

With SSE4.2

$ RUSTFLAGS="-C target-feature=+sse4.2" rustup run nightly cargo bench --features=nightly
...
test bench_httparse             ... bench:         404 ns/iter (+/- 28) = 1740 MB/s
test bench_httparse_short       ... bench:          44 ns/iter (+/- 1) = 1272 MB/s
test bench_picohttpparser       ... bench:         199 ns/iter (+/- 7) = 3532 MB/s
test bench_picohttpparser_short ... bench:          57 ns/iter (+/- 2) = 982 MB/s
test bench_thhp                 ... bench:         219 ns/iter (+/- 18) = 3210 MB/s
test bench_thhp_short           ... bench:          41 ns/iter (+/- 3) = 1365 MB/s
...

Without SIMD

$ rustup run nightly cargo bench
...
test bench_httparse             ... bench:         407 ns/iter (+/- 50) = 1727 MB/s
test bench_httparse_short       ... bench:          43 ns/iter (+/- 7) = 1302 MB/s
test bench_picohttpparser       ... bench:         321 ns/iter (+/- 31) = 2190 MB/s
test bench_picohttpparser_short ... bench:          46 ns/iter (+/- 4) = 1217 MB/s
test bench_thhp                 ... bench:         308 ns/iter (+/- 21) = 2282 MB/s
test bench_thhp_short           ... bench:          43 ns/iter (+/- 2) = 1302 MB/s
...