xref: /aosp_15_r20/external/libdav1d/src/scan.c (revision c09093415860a1c2373dacd84c4fde00c507cdfd)

/*
 * Copyright © 2018, VideoLAN and dav1d authors
 * Copyright © 2018, Two Orioles, LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#include "common/attributes.h"
#include "common/intops.h"

#include "src/scan.h"
#include "src/thread.h"

static const uint16_t ALIGN(scan_4x4[], 32) = {
     0,  4,  1,  2,
     5,  8, 12,  9,
     6,  3,  7, 10,
    13, 14, 11, 15,
};

static const uint16_t ALIGN(scan_4x8[], 32) = {
     0,  8,  1, 16,
     9,  2, 24, 17,
    10,  3, 25, 18,
    11,  4, 26, 19,
    12,  5, 27, 20,
    13,  6, 28, 21,
    14,  7, 29, 22,
    15, 30, 23, 31,
};

static const uint16_t ALIGN(scan_4x16[], 32) = {
     0, 16,  1, 32,
    17,  2, 48, 33,
    18,  3, 49, 34,
    19,  4, 50, 35,
    20,  5, 51, 36,
    21,  6, 52, 37,
    22,  7, 53, 38,
    23,  8, 54, 39,
    24,  9, 55, 40,
    25, 10, 56, 41,
    26, 11, 57, 42,
    27, 12, 58, 43,
    28, 13, 59, 44,
    29, 14, 60, 45,
    30, 15, 61, 46,
    31, 62, 47, 63,
};

static const uint16_t ALIGN(scan_8x4[], 32) = {
     0,  1,  4,  2,  5,  8,  3,  6,
     9, 12,  7, 10, 13, 16, 11, 14,
    17, 20, 15, 18, 21, 24, 19, 22,
    25, 28, 23, 26, 29, 27, 30, 31,
};

static const uint16_t ALIGN(scan_8x8[], 32) = {
     0,  8,  1,  2,  9, 16, 24, 17,
    10,  3,  4, 11, 18, 25, 32, 40,
    33, 26, 19, 12,  5,  6, 13, 20,
    27, 34, 41, 48, 56, 49, 42, 35,
    28, 21, 14,  7, 15, 22, 29, 36,
    43, 50, 57, 58, 51, 44, 37, 30,
    23, 31, 38, 45, 52, 59, 60, 53,
    46, 39, 47, 54, 61, 62, 55, 63,
};

static const uint16_t ALIGN(scan_8x16[], 32) = {
      0,  16,   1,  32,  17,   2,  48,  33,
     18,   3,  64,  49,  34,  19,   4,  80,
     65,  50,  35,  20,   5,  96,  81,  66,
     51,  36,  21,   6, 112,  97,  82,  67,
     52,  37,  22,   7, 113,  98,  83,  68,
     53,  38,  23,   8, 114,  99,  84,  69,
     54,  39,  24,   9, 115, 100,  85,  70,
     55,  40,  25,  10, 116, 101,  86,  71,
     56,  41,  26,  11, 117, 102,  87,  72,
     57,  42,  27,  12, 118, 103,  88,  73,
     58,  43,  28,  13, 119, 104,  89,  74,
     59,  44,  29,  14, 120, 105,  90,  75,
     60,  45,  30,  15, 121, 106,  91,  76,
     61,  46,  31, 122, 107,  92,  77,  62,
     47, 123, 108,  93,  78,  63, 124, 109,
     94,  79, 125, 110,  95, 126, 111, 127,
};

static const uint16_t ALIGN(scan_8x32[], 32) = {
      0,  32,   1,  64,  33,   2,  96,  65,
     34,   3, 128,  97,  66,  35,   4, 160,
    129,  98,  67,  36,   5, 192, 161, 130,
     99,  68,  37,   6, 224, 193, 162, 131,
    100,  69,  38,   7, 225, 194, 163, 132,
    101,  70,  39,   8, 226, 195, 164, 133,
    102,  71,  40,   9, 227, 196, 165, 134,
    103,  72,  41,  10, 228, 197, 166, 135,
    104,  73,  42,  11, 229, 198, 167, 136,
    105,  74,  43,  12, 230, 199, 168, 137,
    106,  75,  44,  13, 231, 200, 169, 138,
    107,  76,  45,  14, 232, 201, 170, 139,
    108,  77,  46,  15, 233, 202, 171, 140,
    109,  78,  47,  16, 234, 203, 172, 141,
    110,  79,  48,  17, 235, 204, 173, 142,
    111,  80,  49,  18, 236, 205, 174, 143,
    112,  81,  50,  19, 237, 206, 175, 144,
    113,  82,  51,  20, 238, 207, 176, 145,
    114,  83,  52,  21, 239, 208, 177, 146,
    115,  84,  53,  22, 240, 209, 178, 147,
    116,  85,  54,  23, 241, 210, 179, 148,
    117,  86,  55,  24, 242, 211, 180, 149,
    118,  87,  56,  25, 243, 212, 181, 150,
    119,  88,  57,  26, 244, 213, 182, 151,
    120,  89,  58,  27, 245, 214, 183, 152,
    121,  90,  59,  28, 246, 215, 184, 153,
    122,  91,  60,  29, 247, 216, 185, 154,
    123,  92,  61,  30, 248, 217, 186, 155,
    124,  93,  62,  31, 249, 218, 187, 156,
    125,  94,  63, 250, 219, 188, 157, 126,
     95, 251, 220, 189, 158, 127, 252, 221,
    190, 159, 253, 222, 191, 254, 223, 255,
};

static const uint16_t ALIGN(scan_16x4[], 32) = {
     0,  1,  4,  2,  5,  8,  3,  6,  9, 12,  7, 10, 13, 16, 11, 14,
    17, 20, 15, 18, 21, 24, 19, 22, 25, 28, 23, 26, 29, 32, 27, 30,
    33, 36, 31, 34, 37, 40, 35, 38, 41, 44, 39, 42, 45, 48, 43, 46,
    49, 52, 47, 50, 53, 56, 51, 54, 57, 60, 55, 58, 61, 59, 62, 63,
};

static const uint16_t ALIGN(scan_16x8[], 32) = {
      0,   1,   8,   2,   9,  16,   3,  10,  17,  24,   4,  11,  18,  25,  32,   5,
     12,  19,  26,  33,  40,   6,  13,  20,  27,  34,  41,  48,   7,  14,  21,  28,
     35,  42,  49,  56,  15,  22,  29,  36,  43,  50,  57,  64,  23,  30,  37,  44,
     51,  58,  65,  72,  31,  38,  45,  52,  59,  66,  73,  80,  39,  46,  53,  60,
     67,  74,  81,  88,  47,  54,  61,  68,  75,  82,  89,  96,  55,  62,  69,  76,
     83,  90,  97, 104,  63,  70,  77,  84,  91,  98, 105, 112,  71,  78,  85,  92,
     99, 106, 113, 120,  79,  86,  93, 100, 107, 114, 121,  87,  94, 101, 108, 115,
    122,  95, 102, 109, 116, 123, 103, 110, 117, 124, 111, 118, 125, 119, 126, 127,
};

static const uint16_t ALIGN(scan_16x16[], 32) = {
      0,  16,   1,   2,  17,  32,  48,  33,  18,   3,   4,  19,  34,  49,  64,  80,
     65,  50,  35,  20,   5,   6,  21,  36,  51,  66,  81,  96, 112,  97,  82,  67,
     52,  37,  22,   7,   8,  23,  38,  53,  68,  83,  98, 113, 128, 144, 129, 114,
     99,  84,  69,  54,  39,  24,   9,  10,  25,  40,  55,  70,  85, 100, 115, 130,
    145, 160, 176, 161, 146, 131, 116, 101,  86,  71,  56,  41,  26,  11,  12,  27,
     42,  57,  72,  87, 102, 117, 132, 147, 162, 177, 192, 208, 193, 178, 163, 148,
    133, 118, 103,  88,  73,  58,  43,  28,  13,  14,  29,  44,  59,  74,  89, 104,
    119, 134, 149, 164, 179, 194, 209, 224, 240, 225, 210, 195, 180, 165, 150, 135,
    120, 105,  90,  75,  60,  45,  30,  15,  31,  46,  61,  76,  91, 106, 121, 136,
    151, 166, 181, 196, 211, 226, 241, 242, 227, 212, 197, 182, 167, 152, 137, 122,
    107,  92,  77,  62,  47,  63,  78,  93, 108, 123, 138, 153, 168, 183, 198, 213,
    228, 243, 244, 229, 214, 199, 184, 169, 154, 139, 124, 109,  94,  79,  95, 110,
    125, 140, 155, 170, 185, 200, 215, 230, 245, 246, 231, 216, 201, 186, 171, 156,
    141, 126, 111, 127, 142, 157, 172, 187, 202, 217, 232, 247, 248, 233, 218, 203,
    188, 173, 158, 143, 159, 174, 189, 204, 219, 234, 249, 250, 235, 220, 205, 190,
    175, 191, 206, 221, 236, 251, 252, 237, 222, 207, 223, 238, 253, 254, 239, 255,
};

static const uint16_t ALIGN(scan_16x32[], 32) = {
      0,  32,   1,  64,  33,   2,  96,  65,  34,   3, 128,  97,  66,  35,   4, 160,
    129,  98,  67,  36,   5, 192, 161, 130,  99,  68,  37,   6, 224, 193, 162, 131,
    100,  69,  38,   7, 256, 225, 194, 163, 132, 101,  70,  39,   8, 288, 257, 226,
    195, 164, 133, 102,  71,  40,   9, 320, 289, 258, 227, 196, 165, 134, 103,  72,
     41,  10, 352, 321, 290, 259, 228, 197, 166, 135, 104,  73,  42,  11, 384, 353,
    322, 291, 260, 229, 198, 167, 136, 105,  74,  43,  12, 416, 385, 354, 323, 292,
    261, 230, 199, 168, 137, 106,  75,  44,  13, 448, 417, 386, 355, 324, 293, 262,
    231, 200, 169, 138, 107,  76,  45,  14, 480, 449, 418, 387, 356, 325, 294, 263,
    232, 201, 170, 139, 108,  77,  46,  15, 481, 450, 419, 388, 357, 326, 295, 264,
    233, 202, 171, 140, 109,  78,  47,  16, 482, 451, 420, 389, 358, 327, 296, 265,
    234, 203, 172, 141, 110,  79,  48,  17, 483, 452, 421, 390, 359, 328, 297, 266,
    235, 204, 173, 142, 111,  80,  49,  18, 484, 453, 422, 391, 360, 329, 298, 267,
    236, 205, 174, 143, 112,  81,  50,  19, 485, 454, 423, 392, 361, 330, 299, 268,
    237, 206, 175, 144, 113,  82,  51,  20, 486, 455, 424, 393, 362, 331, 300, 269,
    238, 207, 176, 145, 114,  83,  52,  21, 487, 456, 425, 394, 363, 332, 301, 270,
    239, 208, 177, 146, 115,  84,  53,  22, 488, 457, 426, 395, 364, 333, 302, 271,
    240, 209, 178, 147, 116,  85,  54,  23, 489, 458, 427, 396, 365, 334, 303, 272,
    241, 210, 179, 148, 117,  86,  55,  24, 490, 459, 428, 397, 366, 335, 304, 273,
    242, 211, 180, 149, 118,  87,  56,  25, 491, 460, 429, 398, 367, 336, 305, 274,
    243, 212, 181, 150, 119,  88,  57,  26, 492, 461, 430, 399, 368, 337, 306, 275,
    244, 213, 182, 151, 120,  89,  58,  27, 493, 462, 431, 400, 369, 338, 307, 276,
    245, 214, 183, 152, 121,  90,  59,  28, 494, 463, 432, 401, 370, 339, 308, 277,
    246, 215, 184, 153, 122,  91,  60,  29, 495, 464, 433, 402, 371, 340, 309, 278,
    247, 216, 185, 154, 123,  92,  61,  30, 496, 465, 434, 403, 372, 341, 310, 279,
    248, 217, 186, 155, 124,  93,  62,  31, 497, 466, 435, 404, 373, 342, 311, 280,
    249, 218, 187, 156, 125,  94,  63, 498, 467, 436, 405, 374, 343, 312, 281, 250,
    219, 188, 157, 126,  95, 499, 468, 437, 406, 375, 344, 313, 282, 251, 220, 189,
    158, 127, 500, 469, 438, 407, 376, 345, 314, 283, 252, 221, 190, 159, 501, 470,
    439, 408, 377, 346, 315, 284, 253, 222, 191, 502, 471, 440, 409, 378, 347, 316,
    285, 254, 223, 503, 472, 441, 410, 379, 348, 317, 286, 255, 504, 473, 442, 411,
    380, 349, 318, 287, 505, 474, 443, 412, 381, 350, 319, 506, 475, 444, 413, 382,
    351, 507, 476, 445, 414, 383, 508, 477, 446, 415, 509, 478, 447, 510, 479, 511,
};

static const uint16_t ALIGN(scan_32x8[], 32) = {
      0,   1,   8,   2,   9,  16,   3,  10,  17,  24,   4,  11,  18,  25,  32,   5,  12,  19,  26,  33,  40,   6,  13,  20,  27,  34,  41,  48,   7,  14,  21,  28,
     35,  42,  49,  56,  15,  22,  29,  36,  43,  50,  57,  64,  23,  30,  37,  44,  51,  58,  65,  72,  31,  38,  45,  52,  59,  66,  73,  80,  39,  46,  53,  60,
     67,  74,  81,  88,  47,  54,  61,  68,  75,  82,  89,  96,  55,  62,  69,  76,  83,  90,  97, 104,  63,  70,  77,  84,  91,  98, 105, 112,  71,  78,  85,  92,
     99, 106, 113, 120,  79,  86,  93, 100, 107, 114, 121, 128,  87,  94, 101, 108, 115, 122, 129, 136,  95, 102, 109, 116, 123, 130, 137, 144, 103, 110, 117, 124,
    131, 138, 145, 152, 111, 118, 125, 132, 139, 146, 153, 160, 119, 126, 133, 140, 147, 154, 161, 168, 127, 134, 141, 148, 155, 162, 169, 176, 135, 142, 149, 156,
    163, 170, 177, 184, 143, 150, 157, 164, 171, 178, 185, 192, 151, 158, 165, 172, 179, 186, 193, 200, 159, 166, 173, 180, 187, 194, 201, 208, 167, 174, 181, 188,
    195, 202, 209, 216, 175, 182, 189, 196, 203, 210, 217, 224, 183, 190, 197, 204, 211, 218, 225, 232, 191, 198, 205, 212, 219, 226, 233, 240, 199, 206, 213, 220,
    227, 234, 241, 248, 207, 214, 221, 228, 235, 242, 249, 215, 222, 229, 236, 243, 250, 223, 230, 237, 244, 251, 231, 238, 245, 252, 239, 246, 253, 247, 254, 255,
};

static const uint16_t ALIGN(scan_32x16[], 32) = {
      0,   1,  16,   2,  17,  32,   3,  18,  33,  48,   4,  19,  34,  49,  64,   5,  20,  35,  50,  65,  80,   6,  21,  36,  51,  66,  81,  96,   7,  22,  37,  52,
     67,  82,  97, 112,   8,  23,  38,  53,  68,  83,  98, 113, 128,   9,  24,  39,  54,  69,  84,  99, 114, 129, 144,  10,  25,  40,  55,  70,  85, 100, 115, 130,
    145, 160,  11,  26,  41,  56,  71,  86, 101, 116, 131, 146, 161, 176,  12,  27,  42,  57,  72,  87, 102, 117, 132, 147, 162, 177, 192,  13,  28,  43,  58,  73,
     88, 103, 118, 133, 148, 163, 178, 193, 208,  14,  29,  44,  59,  74,  89, 104, 119, 134, 149, 164, 179, 194, 209, 224,  15,  30,  45,  60,  75,  90, 105, 120,
    135, 150, 165, 180, 195, 210, 225, 240,  31,  46,  61,  76,  91, 106, 121, 136, 151, 166, 181, 196, 211, 226, 241, 256,  47,  62,  77,  92, 107, 122, 137, 152,
    167, 182, 197, 212, 227, 242, 257, 272,  63,  78,  93, 108, 123, 138, 153, 168, 183, 198, 213, 228, 243, 258, 273, 288,  79,  94, 109, 124, 139, 154, 169, 184,
    199, 214, 229, 244, 259, 274, 289, 304,  95, 110, 125, 140, 155, 170, 185, 200, 215, 230, 245, 260, 275, 290, 305, 320, 111, 126, 141, 156, 171, 186, 201, 216,
    231, 246, 261, 276, 291, 306, 321, 336, 127, 142, 157, 172, 187, 202, 217, 232, 247, 262, 277, 292, 307, 322, 337, 352, 143, 158, 173, 188, 203, 218, 233, 248,
    263, 278, 293, 308, 323, 338, 353, 368, 159, 174, 189, 204, 219, 234, 249, 264, 279, 294, 309, 324, 339, 354, 369, 384, 175, 190, 205, 220, 235, 250, 265, 280,
    295, 310, 325, 340, 355, 370, 385, 400, 191, 206, 221, 236, 251, 266, 281, 296, 311, 326, 341, 356, 371, 386, 401, 416, 207, 222, 237, 252, 267, 282, 297, 312,
    327, 342, 357, 372, 387, 402, 417, 432, 223, 238, 253, 268, 283, 298, 313, 328, 343, 358, 373, 388, 403, 418, 433, 448, 239, 254, 269, 284, 299, 314, 329, 344,
    359, 374, 389, 404, 419, 434, 449, 464, 255, 270, 285, 300, 315, 330, 345, 360, 375, 390, 405, 420, 435, 450, 465, 480, 271, 286, 301, 316, 331, 346, 361, 376,
    391, 406, 421, 436, 451, 466, 481, 496, 287, 302, 317, 332, 347, 362, 377, 392, 407, 422, 437, 452, 467, 482, 497, 303, 318, 333, 348, 363, 378, 393, 408, 423,
    438, 453, 468, 483, 498, 319, 334, 349, 364, 379, 394, 409, 424, 439, 454, 469, 484, 499, 335, 350, 365, 380, 395, 410, 425, 440, 455, 470, 485, 500, 351, 366,
    381, 396, 411, 426, 441, 456, 471, 486, 501, 367, 382, 397, 412, 427, 442, 457, 472, 487, 502, 383, 398, 413, 428, 443, 458, 473, 488, 503, 399, 414, 429, 444,
    459, 474, 489, 504, 415, 430, 445, 460, 475, 490, 505, 431, 446, 461, 476, 491, 506, 447, 462, 477, 492, 507, 463, 478, 493, 508, 479, 494, 509, 495, 510, 511,
};

static const uint16_t ALIGN(scan_32x32[], 32) = {
       0,   32,    1,    2,   33,   64,   96,   65,   34,    3,    4,   35,   66,   97,  128,  160,  129,   98,   67,   36,    5,    6,   37,   68,   99,  130,  161,  192,  224,  193,  162,  131,
     100,   69,   38,    7,    8,   39,   70,  101,  132,  163,  194,  225,  256,  288,  257,  226,  195,  164,  133,  102,   71,   40,    9,   10,   41,   72,  103,  134,  165,  196,  227,  258,
     289,  320,  352,  321,  290,  259,  228,  197,  166,  135,  104,   73,   42,   11,   12,   43,   74,  105,  136,  167,  198,  229,  260,  291,  322,  353,  384,  416,  385,  354,  323,  292,
     261,  230,  199,  168,  137,  106,   75,   44,   13,   14,   45,   76,  107,  138,  169,  200,  231,  262,  293,  324,  355,  386,  417,  448,  480,  449,  418,  387,  356,  325,  294,  263,
     232,  201,  170,  139,  108,   77,   46,   15,   16,   47,   78,  109,  140,  171,  202,  233,  264,  295,  326,  357,  388,  419,  450,  481,  512,  544,  513,  482,  451,  420,  389,  358,
     327,  296,  265,  234,  203,  172,  141,  110,   79,   48,   17,   18,   49,   80,  111,  142,  173,  204,  235,  266,  297,  328,  359,  390,  421,  452,  483,  514,  545,  576,  608,  577,
     546,  515,  484,  453,  422,  391,  360,  329,  298,  267,  236,  205,  174,  143,  112,   81,   50,   19,   20,   51,   82,  113,  144,  175,  206,  237,  268,  299,  330,  361,  392,  423,
     454,  485,  516,  547,  578,  609,  640,  672,  641,  610,  579,  548,  517,  486,  455,  424,  393,  362,  331,  300,  269,  238,  207,  176,  145,  114,   83,   52,   21,   22,   53,   84,
     115,  146,  177,  208,  239,  270,  301,  332,  363,  394,  425,  456,  487,  518,  549,  580,  611,  642,  673,  704,  736,  705,  674,  643,  612,  581,  550,  519,  488,  457,  426,  395,
     364,  333,  302,  271,  240,  209,  178,  147,  116,   85,   54,   23,   24,   55,   86,  117,  148,  179,  210,  241,  272,  303,  334,  365,  396,  427,  458,  489,  520,  551,  582,  613,
     644,  675,  706,  737,  768,  800,  769,  738,  707,  676,  645,  614,  583,  552,  521,  490,  459,  428,  397,  366,  335,  304,  273,  242,  211,  180,  149,  118,   87,   56,   25,   26,
      57,   88,  119,  150,  181,  212,  243,  274,  305,  336,  367,  398,  429,  460,  491,  522,  553,  584,  615,  646,  677,  708,  739,  770,  801,  832,  864,  833,  802,  771,  740,  709,
     678,  647,  616,  585,  554,  523,  492,  461,  430,  399,  368,  337,  306,  275,  244,  213,  182,  151,  120,   89,   58,   27,   28,   59,   90,  121,  152,  183,  214,  245,  276,  307,
     338,  369,  400,  431,  462,  493,  524,  555,  586,  617,  648,  679,  710,  741,  772,  803,  834,  865,  896,  928,  897,  866,  835,  804,  773,  742,  711,  680,  649,  618,  587,  556,
     525,  494,  463,  432,  401,  370,  339,  308,  277,  246,  215,  184,  153,  122,   91,   60,   29,   30,   61,   92,  123,  154,  185,  216,  247,  278,  309,  340,  371,  402,  433,  464,
     495,  526,  557,  588,  619,  650,  681,  712,  743,  774,  805,  836,  867,  898,  929,  960,  992,  961,  930,  899,  868,  837,  806,  775,  744,  713,  682,  651,  620,  589,  558,  527,
     496,  465,  434,  403,  372,  341,  310,  279,  248,  217,  186,  155,  124,   93,   62,   31,   63,   94,  125,  156,  187,  218,  249,  280,  311,  342,  373,  404,  435,  466,  497,  528,
     559,  590,  621,  652,  683,  714,  745,  776,  807,  838,  869,  900,  931,  962,  993,  994,  963,  932,  901,  870,  839,  808,  777,  746,  715,  684,  653,  622,  591,  560,  529,  498,
     467,  436,  405,  374,  343,  312,  281,  250,  219,  188,  157,  126,   95,  127,  158,  189,  220,  251,  282,  313,  344,  375,  406,  437,  468,  499,  530,  561,  592,  623,  654,  685,
     716,  747,  778,  809,  840,  871,  902,  933,  964,  995,  996,  965,  934,  903,  872,  841,  810,  779,  748,  717,  686,  655,  624,  593,  562,  531,  500,  469,  438,  407,  376,  345,
     314,  283,  252,  221,  190,  159,  191,  222,  253,  284,  315,  346,  377,  408,  439,  470,  501,  532,  563,  594,  625,  656,  687,  718,  749,  780,  811,  842,  873,  904,  935,  966,
     997,  998,  967,  936,  905,  874,  843,  812,  781,  750,  719,  688,  657,  626,  595,  564,  533,  502,  471,  440,  409,  378,  347,  316,  285,  254,  223,  255,  286,  317,  348,  379,
     410,  441,  472,  503,  534,  565,  596,  627,  658,  689,  720,  751,  782,  813,  844,  875,  906,  937,  968,  999, 1000,  969,  938,  907,  876,  845,  814,  783,  752,  721,  690,  659,
     628,  597,  566,  535,  504,  473,  442,  411,  380,  349,  318,  287,  319,  350,  381,  412,  443,  474,  505,  536,  567,  598,  629,  660,  691,  722,  753,  784,  815,  846,  877,  908,
     939,  970, 1001, 1002,  971,  940,  909,  878,  847,  816,  785,  754,  723,  692,  661,  630,  599,  568,  537,  506,  475,  444,  413,  382,  351,  383,  414,  445,  476,  507,  538,  569,
     600,  631,  662,  693,  724,  755,  786,  817,  848,  879,  910,  941,  972, 1003, 1004,  973,  942,  911,  880,  849,  818,  787,  756,  725,  694,  663,  632,  601,  570,  539,  508,  477,
     446,  415,  447,  478,  509,  540,  571,  602,  633,  664,  695,  726,  757,  788,  819,  850,  881,  912,  943,  974, 1005, 1006,  975,  944,  913,  882,  851,  820,  789,  758,  727,  696,
     665,  634,  603,  572,  541,  510,  479,  511,  542,  573,  604,  635,  666,  697,  728,  759,  790,  821,  852,  883,  914,  945,  976, 1007, 1008,  977,  946,  915,  884,  853,  822,  791,
     760,  729,  698,  667,  636,  605,  574,  543,  575,  606,  637,  668,  699,  730,  761,  792,  823,  854,  885,  916,  947,  978, 1009, 1010,  979,  948,  917,  886,  855,  824,  793,  762,
     731,  700,  669,  638,  607,  639,  670,  701,  732,  763,  794,  825,  856,  887,  918,  949,  980, 1011, 1012,  981,  950,  919,  888,  857,  826,  795,  764,  733,  702,  671,  703,  734,
     765,  796,  827,  858,  889,  920,  951,  982, 1013, 1014,  983,  952,  921,  890,  859,  828,  797,  766,  735,  767,  798,  829,  860,  891,  922,  953,  984, 1015, 1016,  985,  954,  923,
     892,  861,  830,  799,  831,  862,  893,  924,  955,  986, 1017, 1018,  987,  956,  925,  894,  863,  895,  926,  957,  988, 1019, 1020,  989,  958,  927,  959,  990, 1021, 1022,  991, 1023,
};

const uint16_t *const dav1d_scans[N_RECT_TX_SIZES] = {
    [ TX_4X4  ] = scan_4x4,
    [ TX_8X8  ] = scan_8x8,
    [ TX_16X16] = scan_16x16,
    [ TX_32X32] = scan_32x32,
    [ TX_64X64] = scan_32x32,
    [RTX_4X8  ] = scan_4x8,
    [RTX_8X4  ] = scan_8x4,
    [RTX_8X16 ] = scan_8x16,
    [RTX_16X8 ] = scan_16x8,
    [RTX_16X32] = scan_16x32,
    [RTX_32X16] = scan_32x16,
    [RTX_32X64] = scan_32x32,
    [RTX_64X32] = scan_32x32,
    [RTX_4X16 ] = scan_4x16,
    [RTX_16X4 ] = scan_16x4,
    [RTX_8X32 ] = scan_8x32,
    [RTX_32X8 ] = scan_32x8,
    [RTX_16X64] = scan_16x32,
    [RTX_64X16] = scan_32x16,
};

static uint8_t last_nonzero_col_from_eob_4x4[16];
static uint8_t last_nonzero_col_from_eob_8x8[64];
static uint8_t last_nonzero_col_from_eob_16x16[256];
static uint8_t last_nonzero_col_from_eob_32x32[1024];
static uint8_t last_nonzero_col_from_eob_4x8[32];
static uint8_t last_nonzero_col_from_eob_8x4[32];
static uint8_t last_nonzero_col_from_eob_8x16[128];
static uint8_t last_nonzero_col_from_eob_16x8[128];
static uint8_t last_nonzero_col_from_eob_16x32[512];
static uint8_t last_nonzero_col_from_eob_32x16[512];
static uint8_t last_nonzero_col_from_eob_4x16[64];
static uint8_t last_nonzero_col_from_eob_16x4[64];
static uint8_t last_nonzero_col_from_eob_8x32[256];
static uint8_t last_nonzero_col_from_eob_32x8[256];

static COLD void init_tbl(uint8_t *const last_nonzero_col_from_eob,
                          const uint16_t *const scan, const int w, const int h)
{
    int max_col = 0;
    for (int y = 0, n = 0; y < h; y++) {
        for (int x = 0; x < w; x++, n++) {
            const int rc = scan[n];
            const int rcx = rc & (h - 1);
            max_col = imax(max_col, rcx);
            last_nonzero_col_from_eob[n] = max_col;
        }
    }
}

static COLD void init_internal(void) {
    init_tbl(last_nonzero_col_from_eob_4x4,   scan_4x4,    4,  4);
    init_tbl(last_nonzero_col_from_eob_8x8,   scan_8x8,    8,  8);
    init_tbl(last_nonzero_col_from_eob_16x16, scan_16x16, 16, 16);
    init_tbl(last_nonzero_col_from_eob_32x32, scan_32x32, 32, 32);
    init_tbl(last_nonzero_col_from_eob_4x8,   scan_4x8,    4,  8);
    init_tbl(last_nonzero_col_from_eob_8x4,   scan_8x4,    8,  4);
    init_tbl(last_nonzero_col_from_eob_8x16,  scan_8x16,   8, 16);
    init_tbl(last_nonzero_col_from_eob_16x8,  scan_16x8,  16,  8);
    init_tbl(last_nonzero_col_from_eob_16x32, scan_16x32, 16, 32);
    init_tbl(last_nonzero_col_from_eob_32x16, scan_32x16, 32, 16);
    init_tbl(last_nonzero_col_from_eob_4x16,  scan_4x16,   4, 16);
    init_tbl(last_nonzero_col_from_eob_16x4,  scan_16x4,  16,  4);
    init_tbl(last_nonzero_col_from_eob_8x32,  scan_8x32,   8, 32);
    init_tbl(last_nonzero_col_from_eob_32x8,  scan_32x8,  32,  8);
}

COLD void dav1d_init_last_nonzero_col_from_eob_tables(void) {
    static pthread_once_t initted = PTHREAD_ONCE_INIT;
    pthread_once(&initted, init_internal);
}

const uint8_t *const dav1d_last_nonzero_col_from_eob[N_RECT_TX_SIZES] = {
    [ TX_4X4  ] = last_nonzero_col_from_eob_4x4,
    [ TX_8X8  ] = last_nonzero_col_from_eob_8x8,
    [ TX_16X16] = last_nonzero_col_from_eob_16x16,
    [ TX_32X32] = last_nonzero_col_from_eob_32x32,
    [ TX_64X64] = last_nonzero_col_from_eob_32x32,
    [RTX_4X8  ] = last_nonzero_col_from_eob_4x8,
    [RTX_8X4  ] = last_nonzero_col_from_eob_8x4,
    [RTX_8X16 ] = last_nonzero_col_from_eob_8x16,
    [RTX_16X8 ] = last_nonzero_col_from_eob_16x8,
    [RTX_16X32] = last_nonzero_col_from_eob_16x32,
    [RTX_32X16] = last_nonzero_col_from_eob_32x16,
    [RTX_32X64] = last_nonzero_col_from_eob_32x32,
    [RTX_64X32] = last_nonzero_col_from_eob_32x32,
    [RTX_4X16 ] = last_nonzero_col_from_eob_4x16,
    [RTX_16X4 ] = last_nonzero_col_from_eob_16x4,
    [RTX_8X32 ] = last_nonzero_col_from_eob_8x32,
    [RTX_32X8 ] = last_nonzero_col_from_eob_32x8,
    [RTX_16X64] = last_nonzero_col_from_eob_16x32,
    [RTX_64X16] = last_nonzero_col_from_eob_32x16,
};