sse42.rs.html -- source
Description: Source to the Rust file `src/libcore/../stdsimd/crates/core_arch/src/x86/sse42.rs`.
Keywords: rust, rustlang, rust-lang

      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169
    170
    171
    172
    173
    174
    175
    176
    177
    178
    179
    180
    181
    182
    183
    184
    185
    186
    187
    188
    189
    190
    191
    192
    193
    194
    195
    196
    197
    198
    199
    200
    201
    202
    203
    204
    205
    206
    207
    208
    209
    210
    211
    212
    213
    214
    215
    216
    217
    218
    219
    220
    221
    222
    223
    224
    225
    226
    227
    228
    229
    230
    231
    232
    233
    234
    235
    236
    237
    238
    239
    240
    241
    242
    243
    244
    245
    246
    247
    248
    249
    250
    251
    252
    253
    254
    255
    256
    257
    258
    259
    260
    261
    262
    263
    264
    265
    266
    267
    268
    269
    270
    271
    272
    273
    274
    275
    276
    277
    278
    279
    280
    281
    282
    283
    284
    285
    286
    287
    288
    289
    290
    291
    292
    293
    294
    295
    296
    297
    298
    299
    300
    301
    302
    303
    304
    305
    306
    307
    308
    309
    310
    311
    312
    313
    314
    315
    316
    317
    318
    319
    320
    321
    322
    323
    324
    325
    326
    327
    328
    329
    330
    331
    332
    333
    334
    335
    336
    337
    338
    339
    340
    341
    342
    343
    344
    345
    346
    347
    348
    349
    350
    351
    352
    353
    354
    355
    356
    357
    358
    359
    360
    361
    362
    363
    364
    365
    366
    367
    368
    369
    370
    371
    372
    373
    374
    375
    376
    377
    378
    379
    380
    381
    382
    383
    384
    385
    386
    387
    388
    389
    390
    391
    392
    393
    394
    395
    396
    397
    398
    399
    400
    401
    402
    403
    404
    405
    406
    407
    408
    409
    410
    411
    412
    413
    414
    415
    416
    417
    418
    419
    420
    421
    422
    423
    424
    425
    426
    427
    428
    429
    430
    431
    432
    433
    434
    435
    436
    437
    438
    439
    440
    441
    442
    443
    444
    445
    446
    447
    448
    449
    450
    451
    452
    453
    454
    455
    456
    457
    458
    459
    460
    461
    462
    463
    464
    465
    466
    467
    468
    469
    470
    471
    472
    473
    474
    475
    476
    477
    478
    479
    480
    481
    482
    483
    484
    485
    486
    487
    488
    489
    490
    491
    492
    493
    494
    495
    496
    497
    498
    499
    500
    501
    502
    503
    504
    505
    506
    507
    508
    509
    510
    511
    512
    513
    514
    515
    516
    517
    518
    519
    520
    521
    522
    523
    524
    525
    526
    527
    528
    529
    530
    531
    532
    533
    534
    535
    536
    537
    538
    539
    540
    541
    542
    543
    544
    545
    546
    547
    548
    549
    550
    551
    552
    553
    554
    555
    556
    557
    558
    559
    560
    561
    562
    563
    564
    565
    566
    567
    568
    569
    570
    571
    572
    573
    574
    575
    576
    577
    578
    579
    580
    581
    582
    583
    584
    585
    586
    587
    588
    589
    590
    591
    592
    593
    594
    595
    596
    597
    598
    599
    600
    601
    602
    603
    604
    605
    606
    607
    608
    609
    610
    611
    612
    613
    614
    615
    616
    617
    618
    619
    620
    621
    622
    623
    624
    625
    626
    627
    628
    629
    630
    631
    632
    633
    634
    635
    636
    637
    638
    639
    640
    641
    642
    643
    644
    645
    646
    647
    648
    649
    650
    651
    652
    653
    654
    655
    656
    657
    658
    659
    660
    661
    662
    663
    664
    665
    666
    667
    668
    669
    670
    671
    672
    673
    674
    675
    676
    677
    678
    679
    680
    681
    682
    683
    684
    685
    686
    687
    688
    689
    690
    691
    692
    693
    694
    695
    696
    697
    698
    699
    700
    701
    702
    703
    704
    705
    706
    707
    708
    709
    710
    711
    712
    713
    714
    715
    716
    717
    718
    719
    720
    721
    722
    723
    724
    725
    726
    727
    728
    729
    730
    731
    732
    733
    734
    735
    736
    737
    738
    739
    740
    741
    742
    743
    744
    745
    746
    747
    748
    749
    750
    751
    752
    753
    754
    755
    756
    757
    758
    759
    760
    761
    762
    763
    764
    765
    766
    767
    768
    769
    770
    771
    772
    773
    774
    775
    776
    777
    778
    779
    780
    781
    782
    783
    784
    785
    786
    787
    788
    789
    790
    791
    792
    793
    794
    795
    796
    797
    798
    799
    800
    801
    802
    803
    804
    805
    806
    807
    808
    809
    810
    811
    812
    813
    814
    815
    816
    817
    818
    819
    820
    821
    822
    823
    824
    825
    826
    827
    828
    829
    830
    831
    832
    833
    834
    835
    836
    837
    838
    839
    840
    841
    842
    843
    844
    845
    846
    847
    848
    849
    850
    851
    852
    853
    854
    855
    856
    857
    858
    859
    860
    861
    862
    863
    864
    865
    866
    867
    868
    869
    870
    871
    872
    873
    874
    875
    876
    877
    878
    879
    880
    881
    882
    883
    884
    885
    886
    887
    888
    889
    890
    891
    892
    893
    894
    895
    896
    897
    898
    899
    900

    //! Streaming SIMD Extensions 4.2 (SSE4.2)
    //!
    //! Extends SSE4.1 with STTNI (String and Text New Instructions).

    #[cfg(test)]
    use stdsimd_test::assert_instr;

    use crate::{
        core_arch::{simd::*, simd_llvm::*, x86::*},
        mem::transmute,
    };

    /// String contains unsigned 8-bit characters *(Default)*
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_UBYTE_OPS: i32 = 0b0000_0000;
    /// String contains unsigned 16-bit characters
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_UWORD_OPS: i32 = 0b0000_0001;
    /// String contains signed 8-bit characters
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_SBYTE_OPS: i32 = 0b0000_0010;
    /// String contains unsigned 16-bit characters
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_SWORD_OPS: i32 = 0b0000_0011;

    /// For each character in `a`, find if it is in `b` *(Default)*
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_CMP_EQUAL_ANY: i32 = 0b0000_0000;
    /// For each character in `a`, determine if
    /// `b[0] <= c <= b[1] or b[1] <= c <= b[2]...`
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_CMP_RANGES: i32 = 0b0000_0100;
    /// The strings defined by `a` and `b` are equal
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_CMP_EQUAL_EACH: i32 = 0b0000_1000;
    /// Search for the defined substring in the target
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_CMP_EQUAL_ORDERED: i32 = 0b0000_1100;

    /// Do not negate results *(Default)*
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_POSITIVE_POLARITY: i32 = 0b0000_0000;
    /// Negates results
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_NEGATIVE_POLARITY: i32 = 0b0001_0000;
    /// Do not negate results before the end of the string
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_MASKED_POSITIVE_POLARITY: i32 = 0b0010_0000;
    /// Negates results only before the end of the string
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_MASKED_NEGATIVE_POLARITY: i32 = 0b0011_0000;

    /// **Index only**: return the least significant bit *(Default)*
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_LEAST_SIGNIFICANT: i32 = 0b0000_0000;
    /// **Index only**: return the most significant bit
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_MOST_SIGNIFICANT: i32 = 0b0100_0000;

    /// **Mask only**: return the bit mask
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_BIT_MASK: i32 = 0b0000_0000;
    /// **Mask only**: return the byte mask
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub const _SIDD_UNIT_MASK: i32 = 0b0100_0000;

    /// Compares packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return the generated mask.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistrm)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistrm, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistrm(a: __m128i, b: __m128i, imm8: i32) -> __m128i {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistrm128(a, b, $imm8)
            };
        }
        transmute(constify_imm8!(imm8, call))
    }

    /// Compares packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8` and return the generated index. Similar to
    /// [`_mm_cmpestri`] with the exception that [`_mm_cmpestri`] requires the
    /// lengths of `a` and `b` to be explicitly specified.
    ///
    /// # Control modes
    ///
    /// The control specified by `imm8` may be one or more of the following.
    ///
    /// ## Data size and signedness
    ///
    ///  - [`_SIDD_UBYTE_OPS`] - Default
    ///  - [`_SIDD_UWORD_OPS`]
    ///  - [`_SIDD_SBYTE_OPS`]
    ///  - [`_SIDD_SWORD_OPS`]
    ///
    /// ## Comparison options
    ///  - [`_SIDD_CMP_EQUAL_ANY`] - Default
    ///  - [`_SIDD_CMP_RANGES`]
    ///  - [`_SIDD_CMP_EQUAL_EACH`]
    ///  - [`_SIDD_CMP_EQUAL_ORDERED`]
    ///
    /// ## Result polarity
    ///  - [`_SIDD_POSITIVE_POLARITY`] - Default
    ///  - [`_SIDD_NEGATIVE_POLARITY`]
    ///
    /// ## Bit returned
    ///  - [`_SIDD_LEAST_SIGNIFICANT`] - Default
    ///  - [`_SIDD_MOST_SIGNIFICANT`]
    ///
    /// # Examples
    ///
    /// Finds a substring using [`_SIDD_CMP_EQUAL_ORDERED`]
    ///
    /// ```
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    /// let haystack = b"This is a long string of text data\r\n\tthat extends
    /// multiple lines";
    /// let needle = b"\r\n\t\0\0\0\0\0\0\0\0\0\0\0\0\0";
    ///
    /// let a = _mm_loadu_si128(needle.as_ptr() as *const _);
    /// let hop = 16;
    /// let mut indexes = Vec::new();
    ///
    /// // Chunk the haystack into 16 byte chunks and find
    /// // the first "\r\n\t" in the chunk.
    /// for (i, chunk) in haystack.chunks(hop).enumerate() {
    ///     let b = _mm_loadu_si128(chunk.as_ptr() as *const _);
    ///     let idx = _mm_cmpistri(a, b, _SIDD_CMP_EQUAL_ORDERED);
    ///     if idx != 16 {
    ///         indexes.push((idx as usize) + (i * hop));
    ///     }
    /// }
    /// assert_eq!(indexes, vec![34]);
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// The `_mm_cmpistri` intrinsic may also be used to find the existance of
    /// one or more of a given set of characters in the haystack.
    ///
    /// ```
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    /// // Ensure your input is 16 byte aligned
    /// let password = b"hunter2\0\0\0\0\0\0\0\0\0";
    /// let special_chars = b"!@#$%^&*()[]:;<>";
    ///
    /// // Load the input
    /// let a = _mm_loadu_si128(special_chars.as_ptr() as *const _);
    /// let b = _mm_loadu_si128(password.as_ptr() as *const _);
    ///
    /// // Use _SIDD_CMP_EQUAL_ANY to find the index of any bytes in b
    /// let idx = _mm_cmpistri(a.into(), b.into(), _SIDD_CMP_EQUAL_ANY);
    ///
    /// if idx < 16 {
    ///     println!("Congrats! Your password contains a special character");
    ///     # panic!("{:?} does not contain a special character", password);
    /// } else {
    ///     println!("Your password should contain a special character");
    /// }
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// Finds the index of the first character in the haystack that is within a
    /// range of characters.
    ///
    /// ```
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    /// # let b = b":;<=>?@[\\]^_`abc";
    /// # let b = _mm_loadu_si128(b.as_ptr() as *const _);
    ///
    /// // Specify the ranges of values to be searched for [A-Za-z0-9].
    /// let a = b"AZaz09\0\0\0\0\0\0\0\0\0\0";
    /// let a = _mm_loadu_si128(a.as_ptr() as *const _);
    ///
    /// // Use _SIDD_CMP_RANGES to find the index of first byte in ranges.
    /// // Which in this case will be the first alpha numeric byte found
    /// // in the string.
    /// let idx = _mm_cmpistri(a, b, _SIDD_CMP_RANGES);
    ///
    /// if idx < 16 {
    ///     println!("Found an alpha numeric character");
    ///     # assert_eq!(idx, 13);
    /// } else {
    ///     println!("Did not find an alpha numeric character");
    /// }
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// Working with 16-bit characters.
    ///
    /// ```
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    /// # let mut some_utf16_words = [0u16; 8];
    /// # let mut more_utf16_words = [0u16; 8];
    /// # '❤'.encode_utf16(&mut some_utf16_words);
    /// # '𝕊'.encode_utf16(&mut more_utf16_words);
    /// // Load the input
    /// let a = _mm_loadu_si128(some_utf16_words.as_ptr() as *const _);
    /// let b = _mm_loadu_si128(more_utf16_words.as_ptr() as *const _);
    ///
    /// // Specify _SIDD_UWORD_OPS to compare words instead of bytes, and
    /// // use _SIDD_CMP_EQUAL_EACH to compare the two strings.
    /// let idx = _mm_cmpistri(a, b, _SIDD_UWORD_OPS | _SIDD_CMP_EQUAL_EACH);
    ///
    /// if idx == 0 {
    ///     println!("16-bit unicode strings were equal!");
    ///     # panic!("Strings should not be equal!")
    /// } else {
    ///     println!("16-bit unicode strings were not equal!");
    /// }
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// [`_SIDD_UBYTE_OPS`]: constant._SIDD_UBYTE_OPS.html
    /// [`_SIDD_UWORD_OPS`]: constant._SIDD_UWORD_OPS.html
    /// [`_SIDD_SBYTE_OPS`]: constant._SIDD_SBYTE_OPS.html
    /// [`_SIDD_SWORD_OPS`]: constant._SIDD_SWORD_OPS.html
    /// [`_SIDD_CMP_EQUAL_ANY`]: constant._SIDD_CMP_EQUAL_ANY.html
    /// [`_SIDD_CMP_RANGES`]: constant._SIDD_CMP_RANGES.html
    /// [`_SIDD_CMP_EQUAL_EACH`]: constant._SIDD_CMP_EQUAL_EACH.html
    /// [`_SIDD_CMP_EQUAL_ORDERED`]: constant._SIDD_CMP_EQUAL_ORDERED.html
    /// [`_SIDD_POSITIVE_POLARITY`]: constant._SIDD_POSITIVE_POLARITY.html
    /// [`_SIDD_NEGATIVE_POLARITY`]: constant._SIDD_NEGATIVE_POLARITY.html
    /// [`_SIDD_LEAST_SIGNIFICANT`]: constant._SIDD_LEAST_SIGNIFICANT.html
    /// [`_SIDD_MOST_SIGNIFICANT`]: constant._SIDD_MOST_SIGNIFICANT.html
    /// [`_mm_cmpestri`]: fn._mm_cmpestri.html
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistri)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistri(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistri128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return `1` if any character in `b` was null.
    /// and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistrz)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistrz(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistriz128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return `1` if the resulting mask was non-zero,
    /// and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistrc)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistrc(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistric128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and returns `1` if any character in `a` was null,
    /// and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistrs)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistrs(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistris128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return bit `0` of the resulting bit mask.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistro)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistro(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistrio128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings with implicit lengths in `a` and `b` using the
    /// control in `imm8`, and return `1` if `b` did not contain a null
    /// character and the resulting mask was zero, and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpistra)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpistri, imm8 = 0))]
    #[rustc_args_required_const(2)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpistra(a: __m128i, b: __m128i, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpistria128(a, b, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return the generated mask.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestrm)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestrm, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestrm(a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32) -> __m128i {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestrm128(a, la, b, lb, $imm8)
            };
        }
        transmute(constify_imm8!(imm8, call))
    }

    /// Compares packed strings `a` and `b` with lengths `la` and `lb` using the
    /// control in `imm8` and return the generated index. Similar to
    /// [`_mm_cmpistri`] with the exception that [`_mm_cmpistri`] implicitly
    /// determines the length of `a` and `b`.
    ///
    /// # Control modes
    ///
    /// The control specified by `imm8` may be one or more of the following.
    ///
    /// ## Data size and signedness
    ///
    ///  - [`_SIDD_UBYTE_OPS`] - Default
    ///  - [`_SIDD_UWORD_OPS`]
    ///  - [`_SIDD_SBYTE_OPS`]
    ///  - [`_SIDD_SWORD_OPS`]
    ///
    /// ## Comparison options
    ///  - [`_SIDD_CMP_EQUAL_ANY`] - Default
    ///  - [`_SIDD_CMP_RANGES`]
    ///  - [`_SIDD_CMP_EQUAL_EACH`]
    ///  - [`_SIDD_CMP_EQUAL_ORDERED`]
    ///
    /// ## Result polarity
    ///  - [`_SIDD_POSITIVE_POLARITY`] - Default
    ///  - [`_SIDD_NEGATIVE_POLARITY`]
    ///
    /// ## Bit returned
    ///  - [`_SIDD_LEAST_SIGNIFICANT`] - Default
    ///  - [`_SIDD_MOST_SIGNIFICANT`]
    ///
    /// # Examples
    ///
    /// ```
    /// #[cfg(target_arch = "x86")]
    /// use std::arch::x86::*;
    /// #[cfg(target_arch = "x86_64")]
    /// use std::arch::x86_64::*;
    ///
    /// # fn main() {
    /// #     if is_x86_feature_detected!("sse4.2") {
    /// #         #[target_feature(enable = "sse4.2")]
    /// #         unsafe fn worker() {
    ///
    /// // The string we want to find a substring in
    /// let haystack = b"Split \r\n\t line  ";
    ///
    /// // The string we want to search for with some
    /// // extra bytes we do not want to search for.
    /// let needle = b"\r\n\t ignore this ";
    ///
    /// let a = _mm_loadu_si128(needle.as_ptr() as *const _);
    /// let b = _mm_loadu_si128(haystack.as_ptr() as *const _);
    ///
    /// // Note: We explicitly specify we only want to search `b` for the
    /// // first 3 characters of a.
    /// let idx = _mm_cmpestri(a, 3, b, 15, _SIDD_CMP_EQUAL_ORDERED);
    ///
    /// assert_eq!(idx, 6);
    /// #         }
    /// #         unsafe { worker(); }
    /// #     }
    /// # }
    /// ```
    ///
    /// [`_SIDD_UBYTE_OPS`]: constant._SIDD_UBYTE_OPS.html
    /// [`_SIDD_UWORD_OPS`]: constant._SIDD_UWORD_OPS.html
    /// [`_SIDD_SBYTE_OPS`]: constant._SIDD_SBYTE_OPS.html
    /// [`_SIDD_SWORD_OPS`]: constant._SIDD_SWORD_OPS.html
    /// [`_SIDD_CMP_EQUAL_ANY`]: constant._SIDD_CMP_EQUAL_ANY.html
    /// [`_SIDD_CMP_RANGES`]: constant._SIDD_CMP_RANGES.html
    /// [`_SIDD_CMP_EQUAL_EACH`]: constant._SIDD_CMP_EQUAL_EACH.html
    /// [`_SIDD_CMP_EQUAL_ORDERED`]: constant._SIDD_CMP_EQUAL_ORDERED.html
    /// [`_SIDD_POSITIVE_POLARITY`]: constant._SIDD_POSITIVE_POLARITY.html
    /// [`_SIDD_NEGATIVE_POLARITY`]: constant._SIDD_NEGATIVE_POLARITY.html
    /// [`_SIDD_LEAST_SIGNIFICANT`]: constant._SIDD_LEAST_SIGNIFICANT.html
    /// [`_SIDD_MOST_SIGNIFICANT`]: constant._SIDD_MOST_SIGNIFICANT.html
    /// [`_mm_cmpistri`]: fn._mm_cmpistri.html
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestri)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestri(a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestri128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return `1` if any character in
    /// `b` was null, and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestrz)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestrz(a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestriz128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return `1` if the resulting mask
    /// was non-zero, and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestrc)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestrc(a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestric128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return `1` if any character in
    /// a was null, and `0` otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestrs)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestrs(a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestris128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return bit `0` of the resulting
    /// bit mask.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestro)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestro(a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestrio128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Compares packed strings in `a` and `b` with lengths `la` and `lb`
    /// using the control in `imm8`, and return `1` if `b` did not
    /// contain a null character and the resulting mask was zero, and `0`
    /// otherwise.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpestra)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpestri, imm8 = 0))]
    #[rustc_args_required_const(4)]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpestra(a: __m128i, la: i32, b: __m128i, lb: i32, imm8: i32) -> i32 {
        let a = a.as_i8x16();
        let b = b.as_i8x16();
        macro_rules! call {
            ($imm8:expr) => {
                pcmpestria128(a, la, b, lb, $imm8)
            };
        }
        constify_imm8!(imm8, call)
    }

    /// Starting with the initial value in `crc`, return the accumulated
    /// CRC32 value for unsigned 8-bit integer `v`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_crc32_u8)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(crc32))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_crc32_u8(crc: u32, v: u8) -> u32 {
        crc32_32_8(crc, v)
    }

    /// Starting with the initial value in `crc`, return the accumulated
    /// CRC32 value for unsigned 16-bit integer `v`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_crc32_u16)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(crc32))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_crc32_u16(crc: u32, v: u16) -> u32 {
        crc32_32_16(crc, v)
    }

    /// Starting with the initial value in `crc`, return the accumulated
    /// CRC32 value for unsigned 32-bit integer `v`.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_crc32_u32)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(crc32))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_crc32_u32(crc: u32, v: u32) -> u32 {
        crc32_32_32(crc, v)
    }

    /// Compares packed 64-bit integers in `a` and `b` for greater-than,
    /// return the results.
    ///
    /// [Intel's documentation](https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm_cmpgt_epi64)
    #[inline]
    #[target_feature(enable = "sse4.2")]
    #[cfg_attr(test, assert_instr(pcmpgtq))]
    #[stable(feature = "simd_x86", since = "1.27.0")]
    pub unsafe fn _mm_cmpgt_epi64(a: __m128i, b: __m128i) -> __m128i {
        transmute(simd_gt::<_, i64x2>(a.as_i64x2(), b.as_i64x2()))
    }

    #[allow(improper_ctypes)]
    extern "C" {
        // SSE 4.2 string and text comparison ops
        #[link_name = "llvm.x86.sse42.pcmpestrm128"]
        fn pcmpestrm128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> u8x16;
        #[link_name = "llvm.x86.sse42.pcmpestri128"]
        fn pcmpestri128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestriz128"]
        fn pcmpestriz128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestric128"]
        fn pcmpestric128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestris128"]
        fn pcmpestris128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestrio128"]
        fn pcmpestrio128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpestria128"]
        fn pcmpestria128(a: i8x16, la: i32, b: i8x16, lb: i32, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistrm128"]
        fn pcmpistrm128(a: i8x16, b: i8x16, imm8: i8) -> i8x16;
        #[link_name = "llvm.x86.sse42.pcmpistri128"]
        fn pcmpistri128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistriz128"]
        fn pcmpistriz128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistric128"]
        fn pcmpistric128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistris128"]
        fn pcmpistris128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistrio128"]
        fn pcmpistrio128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        #[link_name = "llvm.x86.sse42.pcmpistria128"]
        fn pcmpistria128(a: i8x16, b: i8x16, imm8: i8) -> i32;
        // SSE 4.2 CRC instructions
        #[link_name = "llvm.x86.sse42.crc32.32.8"]
        fn crc32_32_8(crc: u32, v: u8) -> u32;
        #[link_name = "llvm.x86.sse42.crc32.32.16"]
        fn crc32_32_16(crc: u32, v: u16) -> u32;
        #[link_name = "llvm.x86.sse42.crc32.32.32"]
        fn crc32_32_32(crc: u32, v: u32) -> u32;
    }

    #[cfg(test)]
    mod tests {
        use stdsimd_test::simd_test;

        use crate::core_arch::x86::*;
        use std::ptr;

        // Currently one cannot `load` a &[u8] that is is less than 16
        // in length. This makes loading strings less than 16 in length
        // a bit difficult. Rather than `load` and mutate the __m128i,
        // it is easier to memcpy the given string to a local slice with
        // length 16 and `load` the local slice.
        #[target_feature(enable = "sse4.2")]
        unsafe fn str_to_m128i(s: &[u8]) -> __m128i {
            assert!(s.len() <= 16);
            let slice = &mut [0u8; 16];
            ptr::copy_nonoverlapping(
                s.get_unchecked(0) as *const u8 as *const u8,
                slice.get_unchecked_mut(0) as *mut u8 as *mut u8,
                s.len(),
            );
            _mm_loadu_si128(slice.as_ptr() as *const _)
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistrm() {
            let a = str_to_m128i(b"Hello! Good-Bye!");
            let b = str_to_m128i(b"hello! good-bye!");
            let i = _mm_cmpistrm(a, b, _SIDD_UNIT_MASK);
            #[rustfmt::skip]
            let res = _mm_setr_epi8(
                0x00, !0, !0, !0, !0, !0, !0, 0x00,
                !0, !0, !0, !0, 0x00, !0, !0, !0,
            );
            assert_eq_m128i(i, res);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistri() {
            let a = str_to_m128i(b"Hello");
            let b = str_to_m128i(b"   Hello        ");
            let i = _mm_cmpistri(a, b, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(3, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistrz() {
            let a = str_to_m128i(b"");
            let b = str_to_m128i(b"Hello");
            let i = _mm_cmpistrz(a, b, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistrc() {
            let a = str_to_m128i(b"                ");
            let b = str_to_m128i(b"       !        ");
            let i = _mm_cmpistrc(a, b, _SIDD_UNIT_MASK);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistrs() {
            let a = str_to_m128i(b"Hello");
            let b = str_to_m128i(b"");
            let i = _mm_cmpistrs(a, b, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistro() {
            #[rustfmt::skip]
            let a_bytes = _mm_setr_epi8(
                0x00, 0x47, 0x00, 0x65, 0x00, 0x6c, 0x00, 0x6c,
                0x00, 0x6f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            );
            #[rustfmt::skip]
            let b_bytes = _mm_setr_epi8(
                0x00, 0x48, 0x00, 0x65, 0x00, 0x6c, 0x00, 0x6c,
                0x00, 0x6f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            );
            let a = a_bytes;
            let b = b_bytes;
            let i = _mm_cmpistro(a, b, _SIDD_UWORD_OPS | _SIDD_UNIT_MASK);
            assert_eq!(0, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpistra() {
            let a = str_to_m128i(b"");
            let b = str_to_m128i(b"Hello!!!!!!!!!!!");
            let i = _mm_cmpistra(a, b, _SIDD_UNIT_MASK);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestrm() {
            let a = str_to_m128i(b"Hello!");
            let b = str_to_m128i(b"Hello.");
            let i = _mm_cmpestrm(a, 5, b, 5, _SIDD_UNIT_MASK);
            #[rustfmt::skip]
            let r = _mm_setr_epi8(
                !0, !0, !0, !0, !0, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
            );
            assert_eq_m128i(i, r);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestri() {
            let a = str_to_m128i(b"bar - garbage");
            let b = str_to_m128i(b"foobar");
            let i = _mm_cmpestri(a, 3, b, 6, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(3, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestrz() {
            let a = str_to_m128i(b"");
            let b = str_to_m128i(b"Hello");
            let i = _mm_cmpestrz(a, 16, b, 6, _SIDD_CMP_EQUAL_ORDERED);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestrc() {
            let va = str_to_m128i(b"!!!!!!!!");
            let vb = str_to_m128i(b"        ");
            let i = _mm_cmpestrc(va, 7, vb, 7, _SIDD_UNIT_MASK);
            assert_eq!(0, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestrs() {
            #[rustfmt::skip]
            let a_bytes = _mm_setr_epi8(
                0x00, 0x48, 0x00, 0x65, 0x00, 0x6c, 0x00, 0x6c,
                0x00, 0x6f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            );
            let a = a_bytes;
            let b = _mm_set1_epi8(0x00);
            let i = _mm_cmpestrs(a, 8, b, 0, _SIDD_UWORD_OPS);
            assert_eq!(0, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestro() {
            let a = str_to_m128i(b"Hello");
            let b = str_to_m128i(b"World");
            let i = _mm_cmpestro(a, 5, b, 5, _SIDD_UBYTE_OPS);
            assert_eq!(0, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpestra() {
            let a = str_to_m128i(b"Cannot match a");
            let b = str_to_m128i(b"Null after 14");
            let i = _mm_cmpestra(a, 14, b, 16, _SIDD_CMP_EQUAL_EACH | _SIDD_UNIT_MASK);
            assert_eq!(1, i);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_crc32_u8() {
            let crc = 0x2aa1e72b;
            let v = 0x2a;
            let i = _mm_crc32_u8(crc, v);
            assert_eq!(i, 0xf24122e4);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_crc32_u16() {
            let crc = 0x8ecec3b5;
            let v = 0x22b;
            let i = _mm_crc32_u16(crc, v);
            assert_eq!(i, 0x13bb2fb);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_crc32_u32() {
            let crc = 0xae2912c8;
            let v = 0x845fed;
            let i = _mm_crc32_u32(crc, v);
            assert_eq!(i, 0xffae2ed1);
        }

        #[simd_test(enable = "sse4.2")]
        unsafe fn test_mm_cmpgt_epi64() {
            let a = _mm_setr_epi64x(0, 0x2a);
            let b = _mm_set1_epi64x(0x00);
            let i = _mm_cmpgt_epi64(a, b);
            assert_eq_m128i(i, _mm_setr_epi64x(0x00, 0xffffffffffffffffu64 as i64));
        }
    }

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g., `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g., `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g., `str,u8` or `String,struct:Vec,test`)