22 stable releases
1.13.1 | Sep 29, 2024 |
---|---|
1.12.0 | May 27, 2024 |
1.11.3 | Mar 11, 2024 |
1.10.0 | Oct 27, 2023 |
1.6.1 | Jun 26, 2023 |
#7 in Value formatting
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Used in 580 crates
(53 directly)
82KB
1.5K
SLoC
const-hex
This crate provides a fast conversion of byte arrays to hexadecimal strings, both at compile time, and at run time.
It aims to be a drop-in replacement for the hex
crate, as well as extending
the API with const-eval, a const-generics formatting buffer, similar
to itoa
's, and more.
Version requirement: rustc 1.64+
Performance
This crate offers performance comparable to faster-hex
on x86
/x86-64
architectures but outperforms it on other platforms, as faster-hex
is
only optimized for x86
/x86-64
.
This crate is 10 to 50 times faster than hex
in encoding and decoding, and
100+ times faster than libstd
in formatting.
The following benchmarks were ran on an AMD Ryzen 9 7950X, compiled with
1.83.0-nightly (9e394f551 2024-09-25)
on x86_64-unknown-linux-gnu
.
You can run these benchmarks with cargo bench --features std
on a nightly
compiler.
test check::const_hex::bench1_32b ... bench: 2.85 ns/iter (+/- 0.44)
test check::const_hex::bench2_256b ... bench: 15.36 ns/iter (+/- 0.44)
test check::const_hex::bench3_2k ... bench: 117.55 ns/iter (+/- 1.72)
test check::const_hex::bench4_16k ... bench: 915.78 ns/iter (+/- 56.34)
test check::const_hex::bench5_128k ... bench: 7,269.26 ns/iter (+/- 80.62)
test check::const_hex::bench6_1m ... bench: 58,975.63 ns/iter (+/- 707.02)
test check::faster_hex::bench1_32b ... bench: 2.70 ns/iter (+/- 0.01)
test check::faster_hex::bench2_256b ... bench: 14.45 ns/iter (+/- 1.44)
test check::faster_hex::bench3_2k ... bench: 123.58 ns/iter (+/- 1.09)
test check::faster_hex::bench4_16k ... bench: 960.32 ns/iter (+/- 6.34)
test check::faster_hex::bench5_128k ... bench: 7,709.14 ns/iter (+/- 77.69)
test check::faster_hex::bench6_1m ... bench: 62,165.54 ns/iter (+/- 1,167.78)
test check::naive::bench1_32b ... bench: 16.41 ns/iter (+/- 1.90)
test check::naive::bench2_256b ... bench: 221.25 ns/iter (+/- 3.47)
test check::naive::bench3_2k ... bench: 2,493.23 ns/iter (+/- 154.04)
test check::naive::bench4_16k ... bench: 16,221.81 ns/iter (+/- 384.98)
test check::naive::bench5_128k ... bench: 485,588.59 ns/iter (+/- 10,260.00)
test check::naive::bench6_1m ... bench: 3,895,089.20 ns/iter (+/- 45,589.05)
test decode::const_hex::bench1_32b ... bench: 17.33 ns/iter (+/- 0.38)
test decode::const_hex::bench2_256b ... bench: 38.17 ns/iter (+/- 1.07)
test decode::const_hex::bench3_2k ... bench: 235.07 ns/iter (+/- 3.27)
test decode::const_hex::bench4_16k ... bench: 1,681.14 ns/iter (+/- 17.25)
test decode::const_hex::bench5_128k ... bench: 13,097.65 ns/iter (+/- 101.14)
test decode::const_hex::bench6_1m ... bench: 105,945.60 ns/iter (+/- 2,703.49)
test decode::faster_hex::bench1_32b ... bench: 17.91 ns/iter (+/- 0.40)
test decode::faster_hex::bench2_256b ... bench: 54.53 ns/iter (+/- 1.41)
test decode::faster_hex::bench3_2k ... bench: 245.35 ns/iter (+/- 3.89)
test decode::faster_hex::bench4_16k ... bench: 1,836.62 ns/iter (+/- 25.01)
test decode::faster_hex::bench5_128k ... bench: 14,471.53 ns/iter (+/- 184.29)
test decode::faster_hex::bench6_1m ... bench: 116,688.27 ns/iter (+/- 1,539.72)
test decode::hex::bench1_32b ... bench: 109.14 ns/iter (+/- 1.88)
test decode::hex::bench2_256b ... bench: 712.92 ns/iter (+/- 14.25)
test decode::hex::bench3_2k ... bench: 5,196.66 ns/iter (+/- 102.67)
test decode::hex::bench4_16k ... bench: 41,308.30 ns/iter (+/- 917.60)
test decode::hex::bench5_128k ... bench: 786,648.00 ns/iter (+/- 6,589.60)
test decode::hex::bench6_1m ... bench: 6,316,271.50 ns/iter (+/- 22,712.18)
test decode_to_slice::const_hex::bench1_32b ... bench: 5.14 ns/iter (+/- 0.39)
test decode_to_slice::const_hex::bench2_256b ... bench: 26.18 ns/iter (+/- 0.26)
test decode_to_slice::const_hex::bench3_2k ... bench: 206.71 ns/iter (+/- 1.88)
test decode_to_slice::const_hex::bench4_16k ... bench: 1,666.49 ns/iter (+/- 15.67)
test decode_to_slice::const_hex::bench5_128k ... bench: 12,979.03 ns/iter (+/- 80.40)
test decode_to_slice::const_hex::bench6_1m ... bench: 107,213.20 ns/iter (+/- 4,024.91)
test decode_to_slice::faster_hex::bench1_32b ... bench: 6.51 ns/iter (+/- 0.04)
test decode_to_slice::faster_hex::bench2_256b ... bench: 28.66 ns/iter (+/- 0.29)
test decode_to_slice::faster_hex::bench3_2k ... bench: 217.84 ns/iter (+/- 1.03)
test decode_to_slice::faster_hex::bench4_16k ... bench: 1,730.89 ns/iter (+/- 19.36)
test decode_to_slice::faster_hex::bench5_128k ... bench: 13,439.63 ns/iter (+/- 92.19)
test decode_to_slice::faster_hex::bench6_1m ... bench: 109,432.90 ns/iter (+/- 1,526.01)
test decode_to_slice::hex::bench1_32b ... bench: 38.44 ns/iter (+/- 1.30)
test decode_to_slice::hex::bench2_256b ... bench: 290.78 ns/iter (+/- 16.09)
test decode_to_slice::hex::bench3_2k ... bench: 2,663.51 ns/iter (+/- 48.22)
test decode_to_slice::hex::bench4_16k ... bench: 19,016.95 ns/iter (+/- 514.35)
test decode_to_slice::hex::bench5_128k ... bench: 612,840.31 ns/iter (+/- 6,561.70)
test decode_to_slice::hex::bench6_1m ... bench: 5,098,572.75 ns/iter (+/- 120,113.94)
test encode::const_hex::bench1_32b ... bench: 6.94 ns/iter (+/- 0.06)
test encode::const_hex::bench2_256b ... bench: 11.84 ns/iter (+/- 0.07)
test encode::const_hex::bench3_2k ... bench: 78.36 ns/iter (+/- 0.89)
test encode::const_hex::bench4_16k ... bench: 475.29 ns/iter (+/- 11.56)
test encode::const_hex::bench5_128k ... bench: 3,577.27 ns/iter (+/- 70.48)
test encode::const_hex::bench6_1m ... bench: 29,996.00 ns/iter (+/- 668.44)
test encode::faster_hex::bench1_32b ... bench: 17.31 ns/iter (+/- 0.37)
test encode::faster_hex::bench2_256b ... bench: 39.39 ns/iter (+/- 0.76)
test encode::faster_hex::bench3_2k ... bench: 106.60 ns/iter (+/- 1.41)
test encode::faster_hex::bench4_16k ... bench: 653.21 ns/iter (+/- 5.40)
test encode::faster_hex::bench5_128k ... bench: 5,260.68 ns/iter (+/- 88.46)
test encode::faster_hex::bench6_1m ... bench: 44,520.36 ns/iter (+/- 1,200.74)
test encode::hex::bench1_32b ... bench: 102.77 ns/iter (+/- 0.82)
test encode::hex::bench2_256b ... bench: 720.90 ns/iter (+/- 22.52)
test encode::hex::bench3_2k ... bench: 5,672.44 ns/iter (+/- 287.53)
test encode::hex::bench4_16k ... bench: 38,988.71 ns/iter (+/- 6,457.99)
test encode::hex::bench5_128k ... bench: 364,376.25 ns/iter (+/- 51,416.85)
test encode::hex::bench6_1m ... bench: 2,959,499.88 ns/iter (+/- 410,006.38)
test encode_to_slice::const_hex::bench1_32b ... bench: 1.56 ns/iter (+/- 0.00)
test encode_to_slice::const_hex::bench2_256b ... bench: 6.75 ns/iter (+/- 0.03)
test encode_to_slice::const_hex::bench3_2k ... bench: 58.32 ns/iter (+/- 0.23)
test encode_to_slice::const_hex::bench4_16k ... bench: 518.24 ns/iter (+/- 4.91)
test encode_to_slice::const_hex::bench5_128k ... bench: 4,003.77 ns/iter (+/- 28.57)
test encode_to_slice::const_hex::bench6_1m ... bench: 34,519.64 ns/iter (+/- 656.35)
test encode_to_slice::faster_hex::bench1_32b ... bench: 4.54 ns/iter (+/- 0.01)
test encode_to_slice::faster_hex::bench2_256b ... bench: 8.11 ns/iter (+/- 0.05)
test encode_to_slice::faster_hex::bench3_2k ... bench: 52.10 ns/iter (+/- 0.64)
test encode_to_slice::faster_hex::bench4_16k ... bench: 475.81 ns/iter (+/- 6.50)
test encode_to_slice::faster_hex::bench5_128k ... bench: 3,425.49 ns/iter (+/- 15.01)
test encode_to_slice::faster_hex::bench6_1m ... bench: 28,725.82 ns/iter (+/- 839.95)
test encode_to_slice::hex::bench1_32b ... bench: 12.01 ns/iter (+/- 0.12)
test encode_to_slice::hex::bench2_256b ... bench: 121.68 ns/iter (+/- 1.98)
test encode_to_slice::hex::bench3_2k ... bench: 989.33 ns/iter (+/- 3.83)
test encode_to_slice::hex::bench4_16k ... bench: 8,087.93 ns/iter (+/- 25.25)
test encode_to_slice::hex::bench5_128k ... bench: 64,323.94 ns/iter (+/- 249.97)
test encode_to_slice::hex::bench6_1m ... bench: 515,710.80 ns/iter (+/- 2,232.59)
test format::const_hex::bench1_32b ... bench: 10.26 ns/iter (+/- 0.19)
test format::const_hex::bench2_256b ... bench: 18.28 ns/iter (+/- 0.86)
test format::const_hex::bench3_2k ... bench: 116.95 ns/iter (+/- 2.17)
test format::const_hex::bench4_16k ... bench: 1,122.29 ns/iter (+/- 6.25)
test format::const_hex::bench5_128k ... bench: 8,903.81 ns/iter (+/- 111.29)
test format::const_hex::bench6_1m ... bench: 77,476.15 ns/iter (+/- 1,498.93)
test format::std::bench1_32b ... bench: 370.27 ns/iter (+/- 2.52)
test format::std::bench2_256b ... bench: 2,910.66 ns/iter (+/- 40.35)
test format::std::bench3_2k ... bench: 22,554.52 ns/iter (+/- 263.93)
test format::std::bench4_16k ... bench: 182,692.06 ns/iter (+/- 3,494.64)
test format::std::bench5_128k ... bench: 1,475,988.90 ns/iter (+/- 21,895.90)
test format::std::bench6_1m ... bench: 11,834,234.60 ns/iter (+/- 139,230.20)
Acknowledgements
hex
for the initial encoding/decoding implementationsfaster-hex
for thex86
/x86-64
check and decode implementations- dtolnay/itoa for the initial crate/library API layout
License
Licensed under either of Apache License, Version 2.0 or MIT license at your option.Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in these crates by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
Dependencies
~0–1MB
~20K SLoC