[799] | 1 | /*************************************************************************/ |
---|
| 2 | /* */ |
---|
| 3 | /* Copyright (c) 1994 Stanford University */ |
---|
| 4 | /* */ |
---|
| 5 | /* All rights reserved. */ |
---|
| 6 | /* */ |
---|
| 7 | /* Permission is given to use, copy, and modify this software for any */ |
---|
| 8 | /* non-commercial purpose as long as this copyright notice is not */ |
---|
| 9 | /* removed. All other uses, including redistribution in whole or in */ |
---|
| 10 | /* part, are forbidden without prior written permission. */ |
---|
| 11 | /* */ |
---|
| 12 | /* This software is provided with absolutely no warranty and no */ |
---|
| 13 | /* support. */ |
---|
| 14 | /* */ |
---|
| 15 | /*************************************************************************/ |
---|
| 16 | |
---|
| 17 | /* Performs the laplacian calculation for a subblock */ |
---|
| 18 | |
---|
| 19 | #include "decs.h" |
---|
| 20 | |
---|
| 21 | /////////////////////////// |
---|
| 22 | void laplacalc( long procid, |
---|
| 23 | double ****x, |
---|
| 24 | double ****z, |
---|
| 25 | long psiindex, |
---|
| 26 | long firstrow, |
---|
| 27 | long lastrow, |
---|
| 28 | long firstcol, |
---|
| 29 | long lastcol ) |
---|
| 30 | { |
---|
| 31 | long iindex; |
---|
| 32 | long indexp1; |
---|
| 33 | long indexm1; |
---|
| 34 | long ip1; |
---|
| 35 | long im1; |
---|
| 36 | long i; |
---|
| 37 | long j; |
---|
| 38 | double **t2a; |
---|
| 39 | double **t2b; |
---|
| 40 | double *t1a; |
---|
| 41 | double *t1b; |
---|
| 42 | double *t1c; |
---|
| 43 | double *t1d; |
---|
| 44 | |
---|
| 45 | t2a = (double **) x[procid][psiindex]; |
---|
| 46 | j = gps[procid]->neighbors[UP]; |
---|
| 47 | if (j != -1) |
---|
| 48 | { |
---|
| 49 | t1a = (double *) t2a[0]; |
---|
| 50 | t1b = (double *) x[j][psiindex][im - 2]; |
---|
| 51 | for (i = 1; i <= lastcol; i++) |
---|
| 52 | { |
---|
| 53 | t1a[i] = t1b[i]; |
---|
| 54 | } |
---|
| 55 | } |
---|
| 56 | j = gps[procid]->neighbors[DOWN]; |
---|
| 57 | if (j != -1) |
---|
| 58 | { |
---|
| 59 | t1a = (double *) t2a[im - 1]; |
---|
| 60 | t1b = (double *) x[j][psiindex][1]; |
---|
| 61 | for (i = 1; i <= lastcol; i++) |
---|
| 62 | { |
---|
| 63 | t1a[i] = t1b[i]; |
---|
| 64 | } |
---|
| 65 | } |
---|
| 66 | j = gps[procid]->neighbors[LEFT]; |
---|
| 67 | if (j != -1) { |
---|
| 68 | t2b = (double **) x[j][psiindex]; |
---|
| 69 | for (i = 1; i <= lastrow; i++) |
---|
| 70 | { |
---|
| 71 | t2a[i][0] = t2b[i][jm - 2]; |
---|
| 72 | } |
---|
| 73 | } |
---|
| 74 | j = gps[procid]->neighbors[RIGHT]; |
---|
| 75 | if (j != -1) { |
---|
| 76 | t2b = (double **) x[j][psiindex]; |
---|
| 77 | for (i = 1; i <= lastrow; i++) { |
---|
| 78 | t2a[i][jm - 1] = t2b[i][1]; |
---|
| 79 | } |
---|
| 80 | } |
---|
| 81 | |
---|
| 82 | t2a = (double **) x[procid][psiindex]; |
---|
| 83 | t2b = (double **) z[procid][psiindex]; |
---|
| 84 | for (i = firstrow; i <= lastrow; i++) |
---|
| 85 | { |
---|
| 86 | ip1 = i + 1; |
---|
| 87 | im1 = i - 1; |
---|
| 88 | t1a = (double *) t2a[i]; |
---|
| 89 | t1b = (double *) t2b[i]; |
---|
| 90 | t1c = (double *) t2a[ip1]; |
---|
| 91 | t1d = (double *) t2a[im1]; |
---|
| 92 | for (iindex = firstcol; iindex <= lastcol; iindex++) |
---|
| 93 | { |
---|
| 94 | indexp1 = iindex + 1; |
---|
| 95 | indexm1 = iindex - 1; |
---|
| 96 | t1b[iindex] = factlap * (t1c[iindex] + |
---|
| 97 | t1d[iindex] + t1a[indexp1] + t1a[indexm1] - 4. * t1a[iindex]); |
---|
| 98 | } |
---|
| 99 | } |
---|
| 100 | |
---|
| 101 | if (gps[procid]->neighbors[UP] == -1) |
---|
| 102 | { |
---|
| 103 | t1b = (double *) t2b[0]; |
---|
| 104 | for (j = firstcol; j <= lastcol; j++) |
---|
| 105 | { |
---|
| 106 | t1b[j] = 0.0; |
---|
| 107 | } |
---|
| 108 | } |
---|
| 109 | if (gps[procid]->neighbors[DOWN] == -1) |
---|
| 110 | { |
---|
| 111 | t1b = (double *) t2b[im - 1]; |
---|
| 112 | for (j = firstcol; j <= lastcol; j++) |
---|
| 113 | { |
---|
| 114 | t1b[j] = 0.0; |
---|
| 115 | } |
---|
| 116 | } |
---|
| 117 | if (gps[procid]->neighbors[LEFT] == -1) |
---|
| 118 | { |
---|
| 119 | for (j = firstrow; j <= lastrow; j++) |
---|
| 120 | { |
---|
| 121 | t2b[j][0] = 0.0; |
---|
| 122 | } |
---|
| 123 | } |
---|
| 124 | if (gps[procid]->neighbors[RIGHT] == -1) |
---|
| 125 | { |
---|
| 126 | for (j = firstrow; j <= lastrow; j++) |
---|
| 127 | { |
---|
| 128 | t2b[j][jm - 1] = 0.0; |
---|
| 129 | } |
---|
| 130 | } |
---|
| 131 | |
---|
| 132 | } |
---|