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## Benchmark results
- compile by rustc 1.69.0 (84c898d65 2023-04-16)
0. x86_64-unknown-linux- @i5-4570:
| `name` | `gnu:en` | `gnu:ja` | `musl:en` | `musl:ja` |
|:------------------------|------------:|------------:|------------:|------------:|
| std_memchr | 11.419 µs | 19.754 µs | 10.772 µs | 19.372 µs |
| libc_memchr | 4.849 µs | 5.764 µs | 8.757 µs | 10.205 µs |
| memchr_memchr | 4.767 µs | 5.547 µs | 4.689 µs | 5.417 µs |
| memx_memchr | 4.451 µs | 5.402 µs | 4.426 µs | 5.322 µs |
| memx_memchr_basic | 5.695 µs | 7.498 µs | 5.689 µs | 7.616 µs |
| memx_memchr_sse2 | 4.800 µs | 5.901 µs | 4.827 µs | 6.111 µs |
| memx_memchr_avx2 | 4.447 µs | 5.382 µs | 4.423 µs | 5.341 µs |
1. x86_64-unknown-linux- @Q6600:
| `name` | `gnu:en` | `gnu:ja` | `musl:en` | `musl:ja` |
|:------------------------|------------:|------------:|------------:|------------:|
| std_memchr | 25.486 µs | 38.850 µs | 25.337 µs | 38.914 µs |
| libc_memchr | 15.043 µs | 15.575 µs | 33.467 µs | 42.649 µs |
| memchr_memchr | 16.488 µs | 20.106 µs | 16.281 µs | 20.458 µs |
| memx_memchr | 13.521 µs | 16.070 µs | 13.410 µs | 16.272 µs |
| memx_memchr_basic | 12.925 µs | 17.384 µs | 13.529 µs | 17.963 µs |
| memx_memchr_sse2 | 11.665 µs | 13.748 µs | 11.823 µs | 14.056 µs |
2. i686-unknown-linux- @Q6600:
| `name` | `gnu:en` | `gnu:ja` | `musl:en` | `musl:ja` |
|:------------------------|------------:|------------:|------------:|------------:|
| std_memchr | 24.138 µs | 37.495 µs | 24.541 µs | 38.832 µs |
| libc_memchr | 18.985 µs | 19.098 µs | 32.892 µs | 42.655 µs |
| memchr_memchr | 27.310 µs | 34.959 µs | 28.393 µs | 35.869 µs |
| memx_memchr | 20.387 µs | 21.250 µs | 20.596 µs | 23.687 µs |
| memx_memchr_basic | 20.668 µs | 33.785 µs | 21.694 µs | 35.418 µs |
| memx_memchr_sse2 | 15.648 µs | 16.760 µs | 18.070 µs | 18.835 µs |
3. i586-unknown-linux- @Q6600:
| `name` | `gnu:en` | `gnu:ja` | `musl:en` | `musl:ja` |
|:------------------------|------------:|------------:|------------:|------------:|
| std_memchr | 24.541 µs | 37.953 µs | 24.566 µs | 38.036 µs |
| libc_memchr | 18.644 µs | 19.084 µs | 31.991 µs | 41.918 µs |
| memchr_memchr | 28.627 µs | 35.509 µs | 29.467 µs | 37.143 µs |
| memx_memchr | 19.927 µs | 21.454 µs | 21.084 µs | 24.202 µs |
| memx_memchr_basic | 20.973 µs | 33.587 µs | 25.580 µs | 40.360 µs |
- compile by rustc 1.53.0 (53cb7b09b 2021-06-17)
1. x86_64-unknown-linux-:
| `name` | `gnu:en` | `gnu:ja` | `musl:en` | `musl:ja` |
|:------------------------|------------:|------------:|------------:|------------:|
| std_memchr | 369.140 us | 175.220 us | 367.450 us | 174.240 us |
| libc_memchr | 249.860 us | 72.885 us | 556.310 us | 193.510 us |
| memchr_memchr | 221.400 us | 65.674 us | 225.190 us | 64.664 us |
| memx_memchr | 224.860 us | 62.641 us | 229.790 us | 62.381 us |
| memx_memchr_basic | 226.690 us | 84.038 us | 228.820 us | 83.574 us |
| memx_memchr_sse2 | 218.150 us | 61.512 us | 225.590 us | 60.974 us |
2. i686-unknown-linux-:
| `name` | `gnu:en` | `gnu:ja` | `musl:en` | `musl:ja` |
|:------------------------|------------:|------------:|------------:|------------:|
| std_memchr | 354.390 us | 172.580 us | 341.740 us | 172.530 us |
| libc_memchr | 264.970 us | 77.258 us | 504.580 us | 134.980 us |
| memchr_memchr | 495.090 us | 196.640 us | 531.300 us | 199.020 us |
| memx_memchr | 341.450 us | 91.119 us | 389.200 us | 101.150 us |
| memx_memchr_basic | 270.310 us | 117.170 us | 286.350 us | 123.790 us |
| memx_memchr_sse2 | 266.010 us | 73.213 us | 276.880 us | 76.584 us |
3. i586-unknown-linux-:
| `name` | `gnu:en` | `gnu:ja` | `musl:en` | `musl:ja` |
|:------------------------|------------:|------------:|------------:|------------:|
| std_memchr | 373.800 us | 175.510 us | 348.800 us | 178.230 us |
| libc_memchr | 263.730 us | 76.091 us | 486.350 us | 132.040 us |
| memchr_memchr | 498.680 us | 177.700 us | 497.360 us | 171.890 us |
| memx_memchr | 269.420 us | 116.490 us | 283.440 us | 121.410 us |
| memx_memchr_basic | 271.500 us | 116.470 us | 284.360 us | 121.250 us |
4. armv7-linux-androideabi:
| `name` | `andr:en` | `andr:ja` | `musl:en` | `musl:ja` |
|:------------------------|------------:|------------:|------------:|------------:|
| std_memchr | 1232.100 us | 950.750 us | 1262.200 us | 1047.500 us |
| libc_memchr | 1874.100 us | 1066.300 us | 1865.200 us | 838.210 us |
| memchr_memchr | 1391.400 us | 642.260 us | 1441.300 us | 649.600 us |
| memx_memchr | 1042.000 us | 555.030 us | 1129.400 us | 519.740 us |
| memx_memchr_basic | 1005.600 us | 573.360 us | 1095.400 us | 525.020 us |
- `µs` is micro seconds
- `:en` is english haystack or short length.
- `:ja` is japanese haystack or long length.
- `gnu` is x86_64-unknown-linux-gnu
- `musl` is x86_64-unknown-linux-musl
- @i5-4570: bench on intel i5-4570 @ 3.2GHz
- @Q6600: bench on intel Q6600 @ 2.40GHz or armv7 1.5GHz