Actual source code: baijsolvtran7.c
petsc-3.13.6 2020-09-29
1: #include <../src/mat/impls/baij/seq/baij.h>
2: #include <petsc/private/kernels/blockinvert.h>
4: PetscErrorCode MatSolveTranspose_SeqBAIJ_7_inplace(Mat A,Vec bb,Vec xx)
5: {
6: Mat_SeqBAIJ *a =(Mat_SeqBAIJ*)A->data;
7: IS iscol=a->col,isrow=a->row;
8: PetscErrorCode ierr;
9: const PetscInt *r,*c,*rout,*cout;
10: const PetscInt *diag=a->diag,n=a->mbs,*vi,*ai=a->i,*aj=a->j;
11: PetscInt i,nz,idx,idt,ii,ic,ir,oidx;
12: const MatScalar *aa=a->a,*v;
13: PetscScalar s1,s2,s3,s4,s5,s6,s7,x1,x2,x3,x4,x5,x6,x7,*x,*t;
14: const PetscScalar *b;
17: VecGetArrayRead(bb,&b);
18: VecGetArray(xx,&x);
19: t = a->solve_work;
21: ISGetIndices(isrow,&rout); r = rout;
22: ISGetIndices(iscol,&cout); c = cout;
24: /* copy the b into temp work space according to permutation */
25: ii = 0;
26: for (i=0; i<n; i++) {
27: ic = 7*c[i];
28: t[ii] = b[ic];
29: t[ii+1] = b[ic+1];
30: t[ii+2] = b[ic+2];
31: t[ii+3] = b[ic+3];
32: t[ii+4] = b[ic+4];
33: t[ii+5] = b[ic+5];
34: t[ii+6] = b[ic+6];
35: ii += 7;
36: }
38: /* forward solve the U^T */
39: idx = 0;
40: for (i=0; i<n; i++) {
42: v = aa + 49*diag[i];
43: /* multiply by the inverse of the block diagonal */
44: x1 = t[idx]; x2 = t[1+idx]; x3 = t[2+idx]; x4 = t[3+idx]; x5 = t[4+idx];
45: x6 = t[5+idx]; x7 = t[6+idx];
46: s1 = v[0]*x1 + v[1]*x2 + v[2]*x3 + v[3]*x4 + v[4]*x5 + v[5]*x6 + v[6]*x7;
47: s2 = v[7]*x1 + v[8]*x2 + v[9]*x3 + v[10]*x4 + v[11]*x5 + v[12]*x6 + v[13]*x7;
48: s3 = v[14]*x1 + v[15]*x2 + v[16]*x3 + v[17]*x4 + v[18]*x5 + v[19]*x6 + v[20]*x7;
49: s4 = v[21]*x1 + v[22]*x2 + v[23]*x3 + v[24]*x4 + v[25]*x5 + v[26]*x6 + v[27]*x7;
50: s5 = v[28]*x1 + v[29]*x2 + v[30]*x3 + v[31]*x4 + v[32]*x5 + v[33]*x6 + v[34]*x7;
51: s6 = v[35]*x1 + v[36]*x2 + v[37]*x3 + v[38]*x4 + v[39]*x5 + v[40]*x6 + v[41]*x7;
52: s7 = v[42]*x1 + v[43]*x2 + v[44]*x3 + v[45]*x4 + v[46]*x5 + v[47]*x6 + v[48]*x7;
53: v += 49;
55: vi = aj + diag[i] + 1;
56: nz = ai[i+1] - diag[i] - 1;
57: while (nz--) {
58: oidx = 7*(*vi++);
59: t[oidx] -= v[0]*s1 + v[1]*s2 + v[2]*s3 + v[3]*s4 + v[4]*s5 + v[5]*s6 + v[6]*s7;
60: t[oidx+1] -= v[7]*s1 + v[8]*s2 + v[9]*s3 + v[10]*s4 + v[11]*s5 + v[12]*s6 + v[13]*s7;
61: t[oidx+2] -= v[14]*s1 + v[15]*s2 + v[16]*s3 + v[17]*s4 + v[18]*s5 + v[19]*s6 + v[20]*s7;
62: t[oidx+3] -= v[21]*s1 + v[22]*s2 + v[23]*s3 + v[24]*s4 + v[25]*s5 + v[26]*s6 + v[27]*s7;
63: t[oidx+4] -= v[28]*s1 + v[29]*s2 + v[30]*s3 + v[31]*s4 + v[32]*s5 + v[33]*s6 + v[34]*s7;
64: t[oidx+5] -= v[35]*s1 + v[36]*s2 + v[37]*s3 + v[38]*s4 + v[39]*s5 + v[40]*s6 + v[41]*s7;
65: t[oidx+6] -= v[42]*s1 + v[43]*s2 + v[44]*s3 + v[45]*s4 + v[46]*s5 + v[47]*s6 + v[48]*s7;
66: v += 49;
67: }
68: t[idx] = s1;t[1+idx] = s2; t[2+idx] = s3;t[3+idx] = s4; t[4+idx] = s5;
69: t[5+idx] = s6;t[6+idx] = s7;
70: idx += 7;
71: }
72: /* backward solve the L^T */
73: for (i=n-1; i>=0; i--) {
74: v = aa + 49*diag[i] - 49;
75: vi = aj + diag[i] - 1;
76: nz = diag[i] - ai[i];
77: idt = 7*i;
78: s1 = t[idt]; s2 = t[1+idt]; s3 = t[2+idt];s4 = t[3+idt]; s5 = t[4+idt];
79: s6 = t[5+idt];s7 = t[6+idt];
80: while (nz--) {
81: idx = 7*(*vi--);
82: t[idx] -= v[0]*s1 + v[1]*s2 + v[2]*s3 + v[3]*s4 + v[4]*s5 + v[5]*s6 + v[6]*s7;
83: t[idx+1] -= v[7]*s1 + v[8]*s2 + v[9]*s3 + v[10]*s4 + v[11]*s5 + v[12]*s6 + v[13]*s7;
84: t[idx+2] -= v[14]*s1 + v[15]*s2 + v[16]*s3 + v[17]*s4 + v[18]*s5 + v[19]*s6 + v[20]*s7;
85: t[idx+3] -= v[21]*s1 + v[22]*s2 + v[23]*s3 + v[24]*s4 + v[25]*s5 + v[26]*s6 + v[27]*s7;
86: t[idx+4] -= v[28]*s1 + v[29]*s2 + v[30]*s3 + v[31]*s4 + v[32]*s5 + v[33]*s6 + v[34]*s7;
87: t[idx+5] -= v[35]*s1 + v[36]*s2 + v[37]*s3 + v[38]*s4 + v[39]*s5 + v[40]*s6 + v[41]*s7;
88: t[idx+6] -= v[42]*s1 + v[43]*s2 + v[44]*s3 + v[45]*s4 + v[46]*s5 + v[47]*s6 + v[48]*s7;
89: v -= 49;
90: }
91: }
93: /* copy t into x according to permutation */
94: ii = 0;
95: for (i=0; i<n; i++) {
96: ir = 7*r[i];
97: x[ir] = t[ii];
98: x[ir+1] = t[ii+1];
99: x[ir+2] = t[ii+2];
100: x[ir+3] = t[ii+3];
101: x[ir+4] = t[ii+4];
102: x[ir+5] = t[ii+5];
103: x[ir+6] = t[ii+6];
104: ii += 7;
105: }
107: ISRestoreIndices(isrow,&rout);
108: ISRestoreIndices(iscol,&cout);
109: VecRestoreArrayRead(bb,&b);
110: VecRestoreArray(xx,&x);
111: PetscLogFlops(2.0*49*(a->nz) - 7.0*A->cmap->n);
112: return(0);
113: }
114: PetscErrorCode MatSolveTranspose_SeqBAIJ_7(Mat A,Vec bb,Vec xx)
115: {
116: Mat_SeqBAIJ *a=(Mat_SeqBAIJ*)A->data;
117: PetscErrorCode ierr;
118: IS iscol=a->col,isrow=a->row;
119: const PetscInt n =a->mbs,*vi,*ai=a->i,*aj=a->j,*diag=a->diag;
120: const PetscInt *r,*c,*rout,*cout;
121: PetscInt nz,idx,idt,j,i,oidx,ii,ic,ir;
122: const PetscInt bs =A->rmap->bs,bs2=a->bs2;
123: const MatScalar *aa=a->a,*v;
124: PetscScalar s1,s2,s3,s4,s5,s6,s7,x1,x2,x3,x4,x5,x6,x7,*x,*t;
125: const PetscScalar *b;
128: VecGetArrayRead(bb,&b);
129: VecGetArray(xx,&x);
130: t = a->solve_work;
132: ISGetIndices(isrow,&rout); r = rout;
133: ISGetIndices(iscol,&cout); c = cout;
135: /* copy b into temp work space according to permutation */
136: for (i=0; i<n; i++) {
137: ii = bs*i; ic = bs*c[i];
138: t[ii] = b[ic]; t[ii+1] = b[ic+1]; t[ii+2] = b[ic+2]; t[ii+3] = b[ic+3];
139: t[ii+4] = b[ic+4]; t[ii+5] = b[ic+5]; t[ii+6] = b[ic+6];
140: }
142: /* forward solve the U^T */
143: idx = 0;
144: for (i=0; i<n; i++) {
145: v = aa + bs2*diag[i];
146: /* multiply by the inverse of the block diagonal */
147: x1 = t[idx]; x2 = t[1+idx]; x3 = t[2+idx]; x4 = t[3+idx]; x5 = t[4+idx];
148: x6 = t[5+idx]; x7 = t[6+idx];
149: s1 = v[0]*x1 + v[1]*x2 + v[2]*x3 + v[3]*x4 + v[4]*x5 + v[5]*x6 + v[6]*x7;
150: s2 = v[7]*x1 + v[8]*x2 + v[9]*x3 + v[10]*x4 + v[11]*x5 + v[12]*x6 + v[13]*x7;
151: s3 = v[14]*x1 + v[15]*x2 + v[16]*x3 + v[17]*x4 + v[18]*x5 + v[19]*x6 + v[20]*x7;
152: s4 = v[21]*x1 + v[22]*x2 + v[23]*x3 + v[24]*x4 + v[25]*x5 + v[26]*x6 + v[27]*x7;
153: s5 = v[28]*x1 + v[29]*x2 + v[30]*x3 + v[31]*x4 + v[32]*x5 + v[33]*x6 + v[34]*x7;
154: s6 = v[35]*x1 + v[36]*x2 + v[37]*x3 + v[38]*x4 + v[39]*x5 + v[40]*x6 + v[41]*x7;
155: s7 = v[42]*x1 + v[43]*x2 + v[44]*x3 + v[45]*x4 + v[46]*x5 + v[47]*x6 + v[48]*x7;
156: v -= bs2;
158: vi = aj + diag[i] - 1;
159: nz = diag[i] - diag[i+1] - 1;
160: for (j=0; j>-nz; j--) {
161: oidx = bs*vi[j];
162: t[oidx] -= v[0]*s1 + v[1]*s2 + v[2]*s3 + v[3]*s4 + v[4]*s5 + v[5]*s6 + v[6]*s7;
163: t[oidx+1] -= v[7]*s1 + v[8]*s2 + v[9]*s3 + v[10]*s4 + v[11]*s5 + v[12]*s6 + v[13]*s7;
164: t[oidx+2] -= v[14]*s1 + v[15]*s2 + v[16]*s3 + v[17]*s4 + v[18]*s5 + v[19]*s6 + v[20]*s7;
165: t[oidx+3] -= v[21]*s1 + v[22]*s2 + v[23]*s3 + v[24]*s4 + v[25]*s5 + v[26]*s6 + v[27]*s7;
166: t[oidx+4] -= v[28]*s1 + v[29]*s2 + v[30]*s3 + v[31]*s4 + v[32]*s5 + v[33]*s6 + v[34]*s7;
167: t[oidx+5] -= v[35]*s1 + v[36]*s2 + v[37]*s3 + v[38]*s4 + v[39]*s5 + v[40]*s6 + v[41]*s7;
168: t[oidx+6] -= v[42]*s1 + v[43]*s2 + v[44]*s3 + v[45]*s4 + v[46]*s5 + v[47]*s6 + v[48]*s7;
169: v -= bs2;
170: }
171: t[idx] = s1;t[1+idx] = s2; t[2+idx] = s3; t[3+idx] = s4; t[4+idx] =s5;
172: t[5+idx] = s6; t[6+idx] = s7;
173: idx += bs;
174: }
175: /* backward solve the L^T */
176: for (i=n-1; i>=0; i--) {
177: v = aa + bs2*ai[i];
178: vi = aj + ai[i];
179: nz = ai[i+1] - ai[i];
180: idt = bs*i;
181: s1 = t[idt]; s2 = t[1+idt]; s3 = t[2+idt]; s4 = t[3+idt]; s5 = t[4+idt];
182: s6 = t[5+idt]; s7 = t[6+idt];
183: for (j=0; j<nz; j++) {
184: idx = bs*vi[j];
185: t[idx] -= v[0]*s1 + v[1]*s2 + v[2]*s3 + v[3]*s4 + v[4]*s5 + v[5]*s6 + v[6]*s7;
186: t[idx+1] -= v[7]*s1 + v[8]*s2 + v[9]*s3 + v[10]*s4 + v[11]*s5 + v[12]*s6 + v[13]*s7;
187: t[idx+2] -= v[14]*s1 + v[15]*s2 + v[16]*s3 + v[17]*s4 + v[18]*s5 + v[19]*s6 + v[20]*s7;
188: t[idx+3] -= v[21]*s1 + v[22]*s2 + v[23]*s3 + v[24]*s4 + v[25]*s5 + v[26]*s6 + v[27]*s7;
189: t[idx+4] -= v[28]*s1 + v[29]*s2 + v[30]*s3 + v[31]*s4 + v[32]*s5 + v[33]*s6 + v[34]*s7;
190: t[idx+5] -= v[35]*s1 + v[36]*s2 + v[37]*s3 + v[38]*s4 + v[39]*s5 + v[40]*s6 + v[41]*s7;
191: t[idx+6] -= v[42]*s1 + v[43]*s2 + v[44]*s3 + v[45]*s4 + v[46]*s5 + v[47]*s6 + v[48]*s7;
192: v += bs2;
193: }
194: }
196: /* copy t into x according to permutation */
197: for (i=0; i<n; i++) {
198: ii = bs*i; ir = bs*r[i];
199: x[ir] = t[ii]; x[ir+1] = t[ii+1]; x[ir+2] = t[ii+2]; x[ir+3] = t[ii+3];
200: x[ir+4] = t[ii+4]; x[ir+5] = t[ii+5]; x[ir+6] = t[ii+6];
201: }
203: ISRestoreIndices(isrow,&rout);
204: ISRestoreIndices(iscol,&cout);
205: VecRestoreArrayRead(bb,&b);
206: VecRestoreArray(xx,&x);
207: PetscLogFlops(2.0*bs2*(a->nz) - bs*A->cmap->n);
208: return(0);
209: }