memx

memory functions like a libc memcmp(), memchr(), memmem(), memcpy(), memset()

Features

• Rewriting with rust lang.
• minimum support: rustc 1.41.1 (f3e1a954d 2020-02-24)

Todo

• [ ] Support the zero overhead trait.

Benchmark

• compile by rustc 1.52.1 (9bc8c42bb 2021-05-09)

  1. x86_64:

| name | bench:en | bench:ja | musl:en | musl:ja | |:------------------------|------------:|------------:|------------:|------------:| | stdmemchr | 225.550 uc | 225.530 uc | 225.470 uc | 225.560 uc | | memxmemchr | 255.610 uc | 94.443 uc | 263.300 uc | 93.153 uc | | memxmemchrbasic | 257.020 uc | 92.717 uc | 263.200 uc | 91.207 uc | | memxmemchrlibc | 291.170 uc | 83.617 uc | 646.250 uc | 198.870 uc |

| name | bench:en | bench:ja | musl:en | musl:ja | |:------------------------|------------:|------------:|------------:|------------:| | stdmemcmp | 253.010 uc | 334.350 uc | 419.660 uc | 372.390 uc | | memxmemcmp | 231.610 uc | 282.000 uc | 229.550 uc | 282.410 uc | | memxmemcmpbasic | 568.900 uc | 496.000 uc | 567.050 uc | 495.880 uc | | memxmemcmplibc | 350.580 uc | 425.370 uc | 537.150 uc | 476.790 uc |

| name | bench:en | bench:ja | musl:en | musl:ja | |:------------------------|------------:|------------:|------------:|------------:| | stdmemeq | 277.660 uc | 330.270 uc | 570.310 uc | 523.730 uc | | memxmemeq | 190.760 uc | 252.530 uc | 188.910 uc | 253.260 uc | | memxmemeqbasic | 569.100 uc | 494.500 uc | 568.900 uc | 494.340 uc | | memxmemeqlibc | 338.200 uc | 404.930 uc | 604.540 uc | 658.000 uc |

1. i686:

| name | bench:en | bench:ja | musl:en | musl:ja | |:------------------------|------------:|------------:|------------:|------------:| | stdmemchr | 85.668 uc | 85.534 uc | 85.459 uc | 85.455 uc | | memxmemchr | 302.520 uc | 131.960 uc | 316.640 uc | 137.510 uc | | memxmemchrbasic | 300.150 uc | 136.240 uc | 316.690 uc | 137.940 uc | | memxmemchrlibc | 364.510 uc | 97.201 uc | 603.660 uc | 153.680 uc |

| name | bench:en | bench:ja | musl:en | musl:ja | |:------------------------|------------:|------------:|------------:|------------:| | stdmemcmp | 262.970 uc | 365.830 uc | 562.350 uc | 526.390 uc | | memxmemcmp | 308.270 uc | 416.620 uc | 320.760 uc | 444.170 uc | | memxmemcmpbasic | 610.440 uc | 842.000 uc | 621.930 uc | 863.560 uc | | memxmemcmplibc | 402.930 uc | 529.090 uc | 646.850 uc | 728.580 uc |

| name | bench:en | bench:ja | musl:en | musl:ja | |:------------------------|------------:|------------:|------------:|------------:| | stdmemeq | 285.640 uc | 350.920 uc | 632.690 uc | 657.960 uc | | memxmemeq | 289.600 uc | 383.810 uc | 307.630 uc | 419.700 uc | | memxmemeqbasic | 587.200 uc | 525.210 uc | 578.270 uc | 531.900 uc | | memxmemeqlibc | 367.890 uc | 482.970 uc | 720.300 uc | 857.800 uc |

• std is std::str::find()
• us is micro seconds
• :en is english haystack.
• :ja is japanese haystack.
• musl is x86_64-unknown-linux-musl
• bench on intel Q6600 @ 2.40GHz

Changelogs

This crate's changelog here.

References