src/gmxlib/gmx_lapack/slaruv.c

   1 #include <math.h>
   2 #include "gmx_lapack.h"
   3
   4 void
   5 F77_FUNC(slaruv,SLARUV)(int *iseed, int *n, float *x)
   6 {
   7   const int
   8     mm[512] = {
   9       494,2637,255,2008,1253,
  10       3344,4084,1739,3143,3468,688,1657,1238,3166,1292,3422,1270,2016,
  11       154,2862,697,1706,491,931,1444,444,3577,3944,2184,1661,3482,657,
  12       3023,3618,1267,1828,164,3798,3087,2400,2870,3876,1905,1593,1797,
  13       1234,3460,328,2861,1950,617,2070,3331,769,1558,2412,2800,189,287,
  14       2045,1227,2838,209,2770,3654,3993,192,2253,3491,2889,2857,2094,
  15       1818,688,1407,634,3231,815,3524,1914,516,164,303,2144,3480,119,
  16       3357,837,2826,2332,2089,3780,1700,3712,150,2000,3375,1621,3090,
  17       3765,1149,3146,33,3082,2741,359,3316,1749,185,2784,2202,2199,1364,
  18       1244,2020,3160,2785,2772,1217,1822,1245,2252,3904,2774,997,2573,
  19       1148,545,322,789,1440,752,2859,123,1848,643,2405,2638,2344,46,
  20       3814,913,3649,339,3808,822,2832,3078,3633,2970,637,2249,2081,4019,
  21       1478,242,481,2075,4058,622,3376,812,234,641,4005,1122,3135,2640,
  22       2302,40,1832,2247,2034,2637,1287,1691,496,1597,2394,2584,1843,336,
  23       1472,2407,433,2096,1761,2810,566,442,41,1238,1086,603,840,3168,
  24       1499,1084,3438,2408,1589,2391,288,26,512,1456,171,1677,2657,2270,
  25       2587,2961,1970,1817,676,1410,3723,2803,3185,184,663,499,3784,1631,
  26       1925,3912,1398,1349,1441,2224,2411,1907,3192,2786,382,37,759,2948,
  27       1862,3802,2423,2051,2295,1332,1832,2405,3638,3661,327,3660,716,
  28       1842,3987,1368,1848,2366,2508,3754,1766,3572,2893,307,1297,3966,
  29       758,2598,3406,2922,1038,2934,2091,2451,1580,1958,2055,1507,1078,
  30       3273,17,854,2916,3971,2889,3831,2621,1541,893,736,3992,787,2125,
  31       2364,2460,257,1574,3912,1216,3248,3401,2124,2762,149,2245,166,466,
  32       4018,1399,190,2879,153,2320,18,712,2159,2318,2091,3443,1510,449,
  33       1956,2201,3137,3399,1321,2271,3667,2703,629,2365,2431,1113,3922,
  34       2554,184,2099,3228,4012,1921,3452,3901,572,3309,3171,817,3039,
  35       1696,1256,3715,2077,3019,1497,1101,717,51,981,1978,1813,3881,76,
  36       3846,3694,1682,124,1660,3997,479,1141,886,3514,1301,3604,1888,
  37       1836,1990,2058,692,1194,20,3285,2046,2107,3508,3525,3801,2549,
  38       1145,2253,305,3301,1065,3133,2913,3285,1241,1197,3729,2501,1673,
  39       541,2753,949,2361,1165,4081,2725,3305,3069,3617,3733,409,2157,
  40       1361,3973,1865,2525,1409,3445,3577,77,3761,2149,1449,3005,225,85,
  41       3673,3117,3089,1349,2057,413,65,1845,697,3085,3441,1573,3689,2941,
  42       929,533,2841,4077,721,2821,2249,2397,2817,245,1913,1997,3121,997,
  43       1833,2877,1633,981,2009,941,2449,197,2441,285,1473,2741,3129,909,
  44       2801,421,4073,2813,2337,1429,1177,1901,81,1669,2633,2269,129,1141,
  45       249,3917,2481,3941,2217,2749,3041,1877,345,2861,1809,3141,2825,
  46       157,2881,3637,1465,2829,2161,3365,361,2685,3745,2325,3609,3821,
  47       3537,517,3017,2141,1537
  48     };
  49
  50     int i__1;
  51
  52     int i__, i1, i2, i3, i4, it1, it2, it3, it4;
  53
  54
  55     --iseed;
  56     --x;
  57
  58     it1 = it2 = it3 = it4 = 0;
  59
  60     i1 = iseed[1];
  61     i2 = iseed[2];
  62     i3 = iseed[3];
  63     i4 = iseed[4];
  64
  65     i__1 = (*n<128) ? *n : 128;
  66     for (i__ = 1; i__ <= i__1; ++i__) {
  67
  68         it4 = i4 * mm[i__ + 383];
  69         it3 = it4 / 4096;
  70         it4 -= it3 << 12;
  71         it3 = it3 + i3 * mm[i__ + 383] + i4 * mm[i__ + 255];
  72         it2 = it3 / 4096;
  73         it3 -= it2 << 12;
  74         it2 = it2 + i2 * mm[i__ + 383] + i3 * mm[i__ + 255] +
  75           i4 * mm[i__ + 127];
  76         it1 = it2 / 4096;
  77         it2 -= it1 << 12;
  78         it1 = it1 + i1 * mm[i__ + 383] + i2 * mm[i__ + 255] +
  79           i3 * mm[i__ + 127] + i4 * mm[i__ - 1];
  80         it1 %= 4096;
  81
  82         x[i__] = ((float) it1 + ((float) it2 + ((float) it3 + (
  83                 float) it4 * 2.44140625e-4) * 2.44140625e-4) *
  84                 2.44140625e-4) * 2.44140625e-4;
  85     }
  86
  87     iseed[1] = it1;
  88     iseed[2] = it2;
  89     iseed[3] = it3;
  90     iseed[4] = it4;
  91     return;
  92
  93 }