1 /*$Id: sbaijfact5.c,v 1.4 2001/06/21 21:17:00 bsmith Exp $*/ 2 #include "src/mat/impls/sbaij/seq/sbaij.h" 3 #include "src/inline/ilu.h" 4 5 /* 6 Version for when blocks are 4 by 4 Using natural ordering 7 */ 8 #undef __FUNCT__ 9 #define __FUNCT__ "MatCholeskyFactorNumeric_SeqSBAIJ_4_NaturalOrdering" 10 int MatCholeskyFactorNumeric_SeqSBAIJ_4_NaturalOrdering(Mat A,Mat *B) 11 { 12 Mat C = *B; 13 Mat_SeqSBAIJ *a = (Mat_SeqSBAIJ*)A->data,*b = (Mat_SeqSBAIJ *)C->data; 14 int ierr,i,j,mbs=a->mbs,*bi=b->i,*bj=b->j; 15 int *ai,*aj,k,k1,jmin,jmax,*jl,*il,vj,nexti,ili; 16 MatScalar *ba = b->a,*aa,*ap,*dk,*uik; 17 MatScalar *u,*diag,*rtmp,*rtmp_ptr; 18 PetscTruth pivotinblocks = b->pivotinblocks; 19 20 PetscFunctionBegin; 21 22 /* initialization */ 23 ierr = PetscMalloc(16*mbs*sizeof(MatScalar),&rtmp);CHKERRQ(ierr); 24 ierr = PetscMemzero(rtmp,16*mbs*sizeof(MatScalar));CHKERRQ(ierr); 25 ierr = PetscMalloc(2*mbs*sizeof(int),&il);CHKERRQ(ierr); 26 jl = il + mbs; 27 for (i=0; i<mbs; i++) { 28 jl[i] = mbs; il[0] = 0; 29 } 30 ierr = PetscMalloc(32*sizeof(MatScalar),&dk);CHKERRQ(ierr); 31 uik = dk + 16; 32 33 ai = a->i; aj = a->j; aa = a->a; 34 35 /* for each row k */ 36 for (k = 0; k<mbs; k++){ 37 38 /*initialize k-th row with elements nonzero in row k of A */ 39 jmin = ai[k]; jmax = ai[k+1]; 40 if (jmin < jmax) { 41 ap = aa + jmin*16; 42 for (j = jmin; j < jmax; j++){ 43 vj = aj[j]; /* block col. index */ 44 rtmp_ptr = rtmp + vj*16; 45 for (i=0; i<16; i++) *rtmp_ptr++ = *ap++; 46 } 47 } 48 49 /* modify k-th row by adding in those rows i with U(i,k) != 0 */ 50 ierr = PetscMemcpy(dk,rtmp+k*16,16*sizeof(MatScalar));CHKERRQ(ierr); 51 i = jl[k]; /* first row to be added to k_th row */ 52 53 while (i < mbs){ 54 nexti = jl[i]; /* next row to be added to k_th row */ 55 56 /* compute multiplier */ 57 ili = il[i]; /* index of first nonzero element in U(i,k:bms-1) */ 58 59 /* uik = -inv(Di)*U_bar(i,k) */ 60 diag = ba + i*16; 61 u = ba + ili*16; 62 63 uik[0] = -(diag[0]*u[0] + diag[4]*u[1] + diag[8]*u[2] + diag[12]*u[3]); 64 uik[1] = -(diag[1]*u[0] + diag[5]*u[1] + diag[9]*u[2] + diag[13]*u[3]); 65 uik[2] = -(diag[2]*u[0] + diag[6]*u[1] + diag[10]*u[2]+ diag[14]*u[3]); 66 uik[3] = -(diag[3]*u[0] + diag[7]*u[1] + diag[11]*u[2]+ diag[15]*u[3]); 67 68 uik[4] = -(diag[0]*u[4] + diag[4]*u[5] + diag[8]*u[6] + diag[12]*u[7]); 69 uik[5] = -(diag[1]*u[4] + diag[5]*u[5] + diag[9]*u[6] + diag[13]*u[7]); 70 uik[6] = -(diag[2]*u[4] + diag[6]*u[5] + diag[10]*u[6]+ diag[14]*u[7]); 71 uik[7] = -(diag[3]*u[4] + diag[7]*u[5] + diag[11]*u[6]+ diag[15]*u[7]); 72 73 uik[8] = -(diag[0]*u[8] + diag[4]*u[9] + diag[8]*u[10] + diag[12]*u[11]); 74 uik[9] = -(diag[1]*u[8] + diag[5]*u[9] + diag[9]*u[10] + diag[13]*u[11]); 75 uik[10]= -(diag[2]*u[8] + diag[6]*u[9] + diag[10]*u[10]+ diag[14]*u[11]); 76 uik[11]= -(diag[3]*u[8] + diag[7]*u[9] + diag[11]*u[10]+ diag[15]*u[11]); 77 78 uik[12]= -(diag[0]*u[12] + diag[4]*u[13] + diag[8]*u[14] + diag[12]*u[15]); 79 uik[13]= -(diag[1]*u[12] + diag[5]*u[13] + diag[9]*u[14] + diag[13]*u[15]); 80 uik[14]= -(diag[2]*u[12] + diag[6]*u[13] + diag[10]*u[14]+ diag[14]*u[15]); 81 uik[15]= -(diag[3]*u[12] + diag[7]*u[13] + diag[11]*u[14]+ diag[15]*u[15]); 82 83 /* update D(k) += -U(i,k)^T * U_bar(i,k) */ 84 dk[0] += uik[0]*u[0] + uik[1]*u[1] + uik[2]*u[2] + uik[3]*u[3]; 85 dk[1] += uik[4]*u[0] + uik[5]*u[1] + uik[6]*u[2] + uik[7]*u[3]; 86 dk[2] += uik[8]*u[0] + uik[9]*u[1] + uik[10]*u[2]+ uik[11]*u[3]; 87 dk[3] += uik[12]*u[0]+ uik[13]*u[1]+ uik[14]*u[2]+ uik[15]*u[3]; 88 89 dk[4] += uik[0]*u[4] + uik[1]*u[5] + uik[2]*u[6] + uik[3]*u[7]; 90 dk[5] += uik[4]*u[4] + uik[5]*u[5] + uik[6]*u[6] + uik[7]*u[7]; 91 dk[6] += uik[8]*u[4] + uik[9]*u[5] + uik[10]*u[6]+ uik[11]*u[7]; 92 dk[7] += uik[12]*u[4]+ uik[13]*u[5]+ uik[14]*u[6]+ uik[15]*u[7]; 93 94 dk[8] += uik[0]*u[8] + uik[1]*u[9] + uik[2]*u[10] + uik[3]*u[11]; 95 dk[9] += uik[4]*u[8] + uik[5]*u[9] + uik[6]*u[10] + uik[7]*u[11]; 96 dk[10]+= uik[8]*u[8] + uik[9]*u[9] + uik[10]*u[10]+ uik[11]*u[11]; 97 dk[11]+= uik[12]*u[8]+ uik[13]*u[9]+ uik[14]*u[10]+ uik[15]*u[11]; 98 99 dk[12]+= uik[0]*u[12] + uik[1]*u[13] + uik[2]*u[14] + uik[3]*u[15]; 100 dk[13]+= uik[4]*u[12] + uik[5]*u[13] + uik[6]*u[14] + uik[7]*u[15]; 101 dk[14]+= uik[8]*u[12] + uik[9]*u[13] + uik[10]*u[14]+ uik[11]*u[15]; 102 dk[15]+= uik[12]*u[12]+ uik[13]*u[13]+ uik[14]*u[14]+ uik[15]*u[15]; 103 104 /* update -U(i,k) */ 105 ierr = PetscMemcpy(ba+ili*16,uik,16*sizeof(MatScalar));CHKERRQ(ierr); 106 107 /* add multiple of row i to k-th row ... */ 108 jmin = ili + 1; jmax = bi[i+1]; 109 if (jmin < jmax){ 110 for (j=jmin; j<jmax; j++) { 111 /* rtmp += -U(i,k)^T * U_bar(i,j) */ 112 rtmp_ptr = rtmp + bj[j]*16; 113 u = ba + j*16; 114 rtmp_ptr[0] += uik[0]*u[0] + uik[1]*u[1] + uik[2]*u[2] + uik[3]*u[3]; 115 rtmp_ptr[1] += uik[4]*u[0] + uik[5]*u[1] + uik[6]*u[2] + uik[7]*u[3]; 116 rtmp_ptr[2] += uik[8]*u[0] + uik[9]*u[1] + uik[10]*u[2]+ uik[11]*u[3]; 117 rtmp_ptr[3] += uik[12]*u[0]+ uik[13]*u[1]+ uik[14]*u[2]+ uik[15]*u[3]; 118 119 rtmp_ptr[4] += uik[0]*u[4] + uik[1]*u[5] + uik[2]*u[6] + uik[3]*u[7]; 120 rtmp_ptr[5] += uik[4]*u[4] + uik[5]*u[5] + uik[6]*u[6] + uik[7]*u[7]; 121 rtmp_ptr[6] += uik[8]*u[4] + uik[9]*u[5] + uik[10]*u[6]+ uik[11]*u[7]; 122 rtmp_ptr[7] += uik[12]*u[4]+ uik[13]*u[5]+ uik[14]*u[6]+ uik[15]*u[7]; 123 124 rtmp_ptr[8] += uik[0]*u[8] + uik[1]*u[9] + uik[2]*u[10] + uik[3]*u[11]; 125 rtmp_ptr[9] += uik[4]*u[8] + uik[5]*u[9] + uik[6]*u[10] + uik[7]*u[11]; 126 rtmp_ptr[10]+= uik[8]*u[8] + uik[9]*u[9] + uik[10]*u[10]+ uik[11]*u[11]; 127 rtmp_ptr[11]+= uik[12]*u[8]+ uik[13]*u[9]+ uik[14]*u[10]+ uik[15]*u[11]; 128 129 rtmp_ptr[12]+= uik[0]*u[12] + uik[1]*u[13] + uik[2]*u[14] + uik[3]*u[15]; 130 rtmp_ptr[13]+= uik[4]*u[12] + uik[5]*u[13] + uik[6]*u[14] + uik[7]*u[15]; 131 rtmp_ptr[14]+= uik[8]*u[12] + uik[9]*u[13] + uik[10]*u[14]+ uik[11]*u[15]; 132 rtmp_ptr[15]+= uik[12]*u[12]+ uik[13]*u[13]+ uik[14]*u[14]+ uik[15]*u[15]; 133 } 134 135 /* ... add i to row list for next nonzero entry */ 136 il[i] = jmin; /* update il(i) in column k+1, ... mbs-1 */ 137 j = bj[jmin]; 138 jl[i] = jl[j]; jl[j] = i; /* update jl */ 139 } 140 i = nexti; 141 } 142 143 /* save nonzero entries in k-th row of U ... */ 144 145 /* invert diagonal block */ 146 diag = ba+k*16; 147 ierr = PetscMemcpy(diag,dk,16*sizeof(MatScalar));CHKERRQ(ierr); 148 if (pivotinblocks) { 149 ierr = Kernel_A_gets_inverse_A_4(diag);CHKERRQ(ierr); 150 } else { 151 ierr = Kernel_A_gets_inverse_A_4_nopivot(diag);CHKERRQ(ierr); 152 } 153 154 jmin = bi[k]; jmax = bi[k+1]; 155 if (jmin < jmax) { 156 for (j=jmin; j<jmax; j++){ 157 vj = bj[j]; /* block col. index of U */ 158 u = ba + j*16; 159 rtmp_ptr = rtmp + vj*16; 160 for (k1=0; k1<16; k1++){ 161 *u++ = *rtmp_ptr; 162 *rtmp_ptr++ = 0.0; 163 } 164 } 165 166 /* ... add k to row list for first nonzero entry in k-th row */ 167 il[k] = jmin; 168 i = bj[jmin]; 169 jl[k] = jl[i]; jl[i] = k; 170 } 171 } 172 173 ierr = PetscFree(rtmp);CHKERRQ(ierr); 174 ierr = PetscFree(il);CHKERRQ(ierr); 175 ierr = PetscFree(dk);CHKERRQ(ierr); 176 177 C->factor = FACTOR_CHOLESKY; 178 C->assembled = PETSC_TRUE; 179 C->preallocated = PETSC_TRUE; 180 PetscLogFlops(1.3333*64*b->mbs); /* from inverting diagonal blocks */ 181 PetscFunctionReturn(0); 182 } 183