Can someone explain what the syntax shown below in C is? My question is about the (#define)'s inside the declaration of qdata. They seem to be markers.
This might be useful information: qdata stores a bunch of constants that are used throughout the code.
For completeness, this piece of code can be found in const.c in this repository.
const uint16_t qdata[928] __attribute__((aligned(32))) = {
#define _16XQ 0
Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q, Q,
#define _16XQINV 16
QINV, QINV, QINV, QINV, QINV, QINV, QINV, QINV,
QINV, QINV, QINV, QINV, QINV, QINV, QINV, QINV,
#define _16XV 32
V, V, V, V, V, V, V, V, V, V, V, V, V, V, V, V,
#define _16XFLO 48
FLO, FLO, FLO, FLO, FLO, FLO, FLO, FLO,
FLO, FLO, FLO, FLO, FLO, FLO, FLO, FLO,
#define _16XFHI 64
FHI, FHI, FHI, FHI, FHI, FHI, FHI, FHI,
FHI, FHI, FHI, FHI, FHI, FHI, FHI, FHI,
#define _16XMONTSQLO 80
MONTSQLO, MONTSQLO, MONTSQLO, MONTSQLO,
MONTSQLO, MONTSQLO, MONTSQLO, MONTSQLO,
MONTSQLO, MONTSQLO, MONTSQLO, MONTSQLO,
MONTSQLO, MONTSQLO, MONTSQLO, MONTSQLO,
#define _16XMONTSQHI 96
MONTSQHI, MONTSQHI, MONTSQHI, MONTSQHI,
MONTSQHI, MONTSQHI, MONTSQHI, MONTSQHI,
MONTSQHI, MONTSQHI, MONTSQHI, MONTSQHI,
MONTSQHI, MONTSQHI, MONTSQHI, MONTSQHI,
#define _16XMASK 112
MASK, MASK, MASK, MASK, MASK, MASK, MASK, MASK,
MASK, MASK, MASK, MASK, MASK, MASK, MASK, MASK,
#define _ZETAS_EXP 128
31499, 31499, 2571, 2571, 14746, 14746, 2970, 2970,
13525, 13525, 13525, 13525, 13525, 13525, 13525, 13525,
53134, 53134, 53134, 53134, 53134, 53134, 53134, 53134,
1493, 1493, 1493, 1493, 1493, 1493, 1493, 1493,
1422, 1422, 1422, 1422, 1422, 1422, 1422, 1422,
44630, 44630, 44630, 44630, 27758, 27758, 27758, 27758,
61737, 61737, 61737, 61737, 49846, 49846, 49846, 49846,
3158, 3158, 3158, 3158, 622, 622, 622, 622,
1577, 1577, 1577, 1577, 182, 182, 182, 182,
59709, 59709, 17364, 17364, 39176, 39176, 36479, 36479,
5572, 5572, 64434, 64434, 21439, 21439, 39295, 39295,
573, 573, 2004, 2004, 264, 264, 383, 383,
2500, 2500, 1458, 1458, 1727, 1727, 3199, 3199,
59847, 59020, 1497, 30967, 41972, 20179, 20711, 25081,
52740, 26617, 16065, 53095, 9135, 64887, 39550, 27837,
1223, 652, 2777, 1015, 2036, 1491, 3047, 1785,
516, 3321, 3009, 2663, 1711, 2167, 126, 1469,
65202, 54059, 33310, 20494, 37798, 945, 50654, 6182,
32011, 10631, 29176, 36775, 47051, 17561, 51106, 60261,
2226, 555, 2078, 1550, 422, 177, 3038, 1574,
3083, 1159, 2552, 2727, 1739, 2457, 418, 3173,
11182, 13387, 51303, 43881, 13131, 60950, 23093, 5493,
33034, 30318, 46795, 12639, 20100, 18525, 19529, 52918,
430, 843, 871, 105, 587, 3094, 2869, 1653,
778, 3182, 1483, 1119, 644, 349, 329, 3254,
788, 788, 1812, 1812, 28191, 28191, 28191, 28191,
28191, 28191, 28191, 28191, 48842, 48842, 48842, 48842,
48842, 48842, 48842, 48842, 287, 287, 287, 287,
287, 287, 287, 287, 202, 202, 202, 202,
202, 202, 202, 202, 10690, 10690, 10690, 10690,
1359, 1359, 1359, 1359, 54335, 54335, 54335, 54335,
31164, 31164, 31164, 31164, 962, 962, 962, 962,
2127, 2127, 2127, 2127, 1855, 1855, 1855, 1855,
1468, 1468, 1468, 1468, 37464, 37464, 24313, 24313,
55004, 55004, 8800, 8800, 18427, 18427, 8859, 8859,
26676, 26676, 49374, 49374, 2648, 2648, 1017, 1017,
732, 732, 608, 608, 1787, 1787, 411, 411,
3124, 3124, 1758, 1758, 19884, 37287, 49650, 56638,
37227, 9076, 35338, 18250, 13427, 14017, 36381, 52780,
16832, 4312, 41381, 47622, 2476, 3239, 3058, 830,
107, 1908, 3082, 2378, 2931, 961, 1821, 2604,
448, 2264, 677, 2054, 34353, 25435, 58154, 24392,
44610, 10946, 24215, 16990, 10336, 57603, 43035, 10907,
31637, 28644, 23998, 48114, 817, 603, 1322, 1864,
2114, 1218, 2455, 2142, 2144, 2051, 1819, 2459,
3221, 996, 958, 1522, 20297, 2146, 15356, 33152,
59257, 50634, 54492, 14470, 44039, 45338, 23211, 48094,
41677, 45279, 7757, 23132, 1097, 610, 2044, 384,
3193, 1994, 220, 1670, 1799, 794, 2475, 478,
3021, 991, 1869, 1628, 0, 0, 0, 0,
#define _ZETAS_INV_EXP 528
42405, 57780, 20258, 23860, 17443, 42326, 20199, 21498,
51067, 11045, 14903, 6280, 32385, 50181, 63391, 45240,
1701, 1460, 2338, 308, 2851, 854, 2535, 1530,
1659, 3109, 1335, 136, 2945, 1285, 2719, 2232,
17423, 41539, 36893, 33900, 54630, 22502, 7934, 55201,
48547, 41322, 54591, 20927, 41145, 7383, 40102, 31184,
1807, 2371, 2333, 108, 870, 1510, 1278, 1185,
1187, 874, 2111, 1215, 1465, 2007, 2726, 2512,
17915, 24156, 61225, 48705, 12757, 29156, 51520, 52110,
47287, 30199, 56461, 28310, 8899, 15887, 28250, 45653,
1275, 2652, 1065, 2881, 725, 1508, 2368, 398,
951, 247, 1421, 3222, 2499, 271, 90, 853,
16163, 16163, 38861, 38861, 56678, 56678, 47110, 47110,
56737, 56737, 10533, 10533, 41224, 41224, 28073, 28073,
1571, 1571, 205, 205, 2918, 2918, 1542, 1542,
2721, 2721, 2597, 2597, 2312, 2312, 681, 681,
34373, 34373, 34373, 34373, 11202, 11202, 11202, 11202,
64178, 64178, 64178, 64178, 54847, 54847, 54847, 54847,
1861, 1861, 1861, 1861, 1474, 1474, 1474, 1474,
1202, 1202, 1202, 1202, 2367, 2367, 2367, 2367,
16695, 16695, 16695, 16695, 16695, 16695, 16695, 16695,
37346, 37346, 37346, 37346, 37346, 37346, 37346, 37346,
3127, 3127, 3127, 3127, 3127, 3127, 3127, 3127,
3042, 3042, 3042, 3042, 3042, 3042, 3042, 3042,
64749, 64749, 1517, 1517, 12619, 46008, 47012, 45437,
52898, 18742, 35219, 32503, 60044, 42444, 4587, 52406,
21656, 14234, 52150, 54355, 75, 3000, 2980, 2685,
2210, 1846, 147, 2551, 1676, 460, 235, 2742,
3224, 2458, 2486, 2899, 5276, 14431, 47976, 18486,
28762, 36361, 54906, 33526, 59355, 14883, 64592, 27739,
45043, 32227, 11478, 335, 156, 2911, 872, 1590,
602, 777, 2170, 246, 1755, 291, 3152, 2907,
1779, 1251, 2774, 1103, 37700, 25987, 650, 56402,
12442, 49472, 38920, 12797, 40456, 44826, 45358, 23565,
34570, 64040, 6517, 5690, 1860, 3203, 1162, 1618,
666, 320, 8, 2813, 1544, 282, 1838, 1293,
2314, 552, 2677, 2106, 26242, 26242, 44098, 44098,
1103, 1103, 59965, 59965, 29058, 29058, 26361, 26361,
48173, 48173, 5828, 5828, 130, 130, 1602, 1602,
1871, 1871, 829, 829, 2946, 2946, 3065, 3065,
1325, 1325, 2756, 2756, 15691, 15691, 15691, 15691,
3800, 3800, 3800, 3800, 37779, 37779, 37779, 37779,
20907, 20907, 20907, 20907, 3147, 3147, 3147, 3147,
1752, 1752, 1752, 1752, 2707, 2707, 2707, 2707,
171, 171, 171, 171, 12403, 12403, 12403, 12403,
12403, 12403, 12403, 12403, 52012, 52012, 52012, 52012,
52012, 52012, 52012, 52012, 1907, 1907, 1907, 1907,
1907, 1907, 1907, 1907, 1836, 1836, 1836, 1836,
1836, 1836, 1836, 1836, 50791, 50791, 359, 359,
60300, 60300, 1932, 1932, 0, 0, 0, 0
};