3 #include "../gmx_blas.h"
4 #include "../gmx_lapack.h"
5 #include "lapack_limits.h"
7 #include "types/simple.h"
10 F77_FUNC(dbdsdc,DBDSDC)(const char *uplo,
25 int u_dim1, u_offset, vt_dim1, vt_offset, i__1, i__2;
34 int ivt, difl, difr, ierr, perm, mlvl, sqre;
35 int poles, iuplo, nsize, start;
39 int givnum, givptr, qstart, smlsiz, wstart, smlszp;
48 u_offset = 1 + u_dim1;
51 vt_offset = 1 + vt_dim1;
58 k = iu = z__ = ic = is = ivt = difl = difr = perm = 0;
59 poles = givnum = givptr = givcol = 0;
61 smlsiz = DBDSDC_SMALLSIZE;
64 iuplo = (*uplo=='U' || *uplo=='u') ? 1 : 2;
88 q[1] = (d__[1]>0) ? 1.0 : -1.0;
89 q[smlsiz * *n + 1] = 1.;
90 } else if (icompq == 2) {
91 u[u_dim1 + 1] = (d__[1]>0) ? 1.0 : -1.0;
94 d__[1] = fabs(d__[1]);
101 F77_FUNC(dcopy,DCOPY)(n, &d__[1], &c_1, &q[1], &c_1);
103 F77_FUNC(dcopy,DCOPY)(&i__1, &e[1], &c_1, &q[*n + 1], &c_1);
107 wstart = (*n << 1) - 1;
109 for (i__ = 1; i__ <= i__1; ++i__) {
110 F77_FUNC(dlartg,DLARTG)(&d__[i__], &e[i__], &cs, &sn, &r__);
112 e[i__] = sn * d__[i__ + 1];
113 d__[i__ + 1] = cs * d__[i__ + 1];
115 q[i__ + (*n << 1)] = cs;
116 q[i__ + *n * 3] = sn;
117 } else if (icompq == 2) {
119 work[nm1 + i__] = -sn;
124 F77_FUNC(dlasdq,DLASDQ)("U",&c_0,n,&c_0,&c_0,&c_0,&d__[1],&e[1],&vt[vt_offset],ldvt,
125 &u[u_offset], ldu, &u[u_offset], ldu, &work[wstart], info);
130 F77_FUNC(dlaset,DLASET)("A", n, n, &zero, &one, &u[u_offset], ldu);
131 F77_FUNC(dlaset,DLASET)("A", n, n, &zero, &one, &vt[vt_offset], ldvt);
132 F77_FUNC(dlasdq,DLASDQ)("U",&c_0,n,n,n,&c_0,&d__[1],&e[1],&vt[vt_offset],ldvt,
133 &u[u_offset],ldu,&u[u_offset],ldu,&work[wstart],info);
134 } else if (icompq == 1) {
137 F77_FUNC(dlaset,DLASET)("A", n, n, &zero, &one, &q[iu + (qstart - 1) * *n], n);
138 F77_FUNC(dlaset,DLASET)("A", n, n, &zero, &one, &q[ivt + (qstart - 1) * *n], n);
139 F77_FUNC(dlasdq,DLASDQ)("U", &c_0, n, n, n, &c_0, &d__[1], &e[1],
140 &q[ivt + (qstart - 1) * *n], n, &q[iu + (qstart - 1) * *n],
141 n, &q[iu + (qstart - 1) * *n], n, &work[wstart], info);
147 F77_FUNC(dlaset,DLASET)("A", n, n, &zero, &one, &u[u_offset], ldu);
148 F77_FUNC(dlaset,DLASET)("A", n, n, &zero, &one, &vt[vt_offset], ldvt);
151 orgnrm = F77_FUNC(dlanst,DLANST)("M", n, &d__[1], &e[1]);
152 if ( fabs(orgnrm)<GMX_DOUBLE_MIN) {
155 F77_FUNC(dlascl,DLASCL)("G", &c_0, &c_0, &orgnrm, &one, n, &c_1, &d__[1], n, &ierr);
156 F77_FUNC(dlascl,DLASCL)("G", &c_0, &c_0, &orgnrm, &one, &nm1, &c_1, &e[1], &nm1, &ierr);
158 eps = GMX_DOUBLE_EPS;
160 mlvl = (int) (log((double) (*n) / (double) (smlsiz + 1)) /
169 z__ = difr + (mlvl << 1);
173 givnum = poles + (mlvl << 1);
178 givcol = perm + mlvl;
182 for (i__ = 1; i__ <= i__1; ++i__) {
183 if (fabs(d__[i__]) < eps)
184 d__[i__] = (d__[i__]>0) ? eps : -eps;
191 for (i__ = 1; i__ <= i__1; ++i__) {
192 if (fabs(e[i__]) < eps || i__ == nm1) {
194 nsize = i__ - start + 1;
195 } else if (fabs(e[i__]) >= eps) {
196 nsize = *n - start + 1;
198 nsize = i__ - start + 1;
200 u[*n + *n * u_dim1] = (d__[*n]>0) ? 1.0 : -1.0;
201 vt[*n + *n * vt_dim1] = 1.;
202 } else if (icompq == 1) {
203 q[*n + (qstart - 1) * *n] = (d__[*n]>0) ? 1.0 : -1.0;
204 q[*n + (smlsiz + qstart - 1) * *n] = 1.;
206 d__[*n] = fabs(d__[*n]);
209 F77_FUNC(dlasd0,DLASD0)(&nsize, &sqre, &d__[start], &e[start],
210 &u[start + start * u_dim1], ldu,
211 &vt[start + start * vt_dim1],
212 ldvt, &smlsiz, &iwork[1], &work[wstart], info);
214 F77_FUNC(dlasda,DLASDA)(&icompq, &smlsiz, &nsize, &sqre, &d__[start],
215 &e[start], &q[start + (iu + qstart - 2) * *n], n,
216 &q[start + (ivt + qstart - 2) * *n], &iq[start + k * *n],
217 &q[start + (difl + qstart - 2) * *n],
218 &q[start + (difr + qstart - 2) * *n],
219 &q[start + (z__ + qstart - 2) * *n],
220 &q[start + (poles + qstart - 2) * *n],
221 &iq[start + givptr * *n], &iq[start + givcol * *n], n,
222 &iq[start + perm * *n],
223 &q[start + (givnum + qstart - 2) * *n],
224 &q[start + (ic + qstart - 2) * *n],
225 &q[start + (is + qstart - 2) * *n], &work[wstart],
234 F77_FUNC(dlascl,DLASCL)("G", &c_0, &c_0, &one, &orgnrm, n, &c_1, &d__[1], n, &ierr);
237 for (ii = 2; ii <= i__1; ++ii) {
242 for (j = ii; j <= i__2; ++j) {
253 } else if (icompq == 2) {
254 F77_FUNC(dswap,DSWAP)(n, &u[i__ * u_dim1 + 1],&c_1,&u[kk*u_dim1+1],&c_1);
255 F77_FUNC(dswap,DSWAP)(n, &vt[i__ + vt_dim1], ldvt, &vt[kk + vt_dim1], ldvt);
257 } else if (icompq == 1) {
268 if (iuplo == 2 && icompq == 2) {
269 F77_FUNC(dlasr,DLASR)("L", "V", "B", n, n, &work[1], &work[*n], &u[u_offset], ldu);