134 lines
4.7 KiB
C++
134 lines
4.7 KiB
C++
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
#include "lmp_f2c.h"
|
|
static integer c__1 = 1;
|
|
static integer c_n1 = -1;
|
|
static integer c__3 = 3;
|
|
static integer c__2 = 2;
|
|
static doublereal c_b22 = -1.;
|
|
static doublereal c_b23 = 1.;
|
|
int dsytrd_(char *uplo, integer *n, doublereal *a, integer *lda, doublereal *d__, doublereal *e,
|
|
doublereal *tau, doublereal *work, integer *lwork, integer *info, ftnlen uplo_len)
|
|
{
|
|
integer a_dim1, a_offset, i__1, i__2, i__3;
|
|
integer i__, j, nb, kk, nx, iws;
|
|
extern logical lsame_(char *, char *, ftnlen, ftnlen);
|
|
integer nbmin, iinfo;
|
|
logical upper;
|
|
extern int dsytd2_(char *, integer *, doublereal *, integer *, doublereal *, doublereal *,
|
|
doublereal *, integer *, ftnlen),
|
|
dsyr2k_(char *, char *, integer *, integer *, doublereal *, doublereal *, integer *,
|
|
doublereal *, integer *, doublereal *, doublereal *, integer *, ftnlen, ftnlen),
|
|
dlatrd_(char *, integer *, integer *, doublereal *, integer *, doublereal *, doublereal *,
|
|
doublereal *, integer *, ftnlen),
|
|
xerbla_(char *, integer *, ftnlen);
|
|
extern integer ilaenv_(integer *, char *, char *, integer *, integer *, integer *, integer *,
|
|
ftnlen, ftnlen);
|
|
integer ldwork, lwkopt;
|
|
logical lquery;
|
|
a_dim1 = *lda;
|
|
a_offset = 1 + a_dim1;
|
|
a -= a_offset;
|
|
--d__;
|
|
--e;
|
|
--tau;
|
|
--work;
|
|
*info = 0;
|
|
upper = lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1);
|
|
lquery = *lwork == -1;
|
|
if (!upper && !lsame_(uplo, (char *)"L", (ftnlen)1, (ftnlen)1)) {
|
|
*info = -1;
|
|
} else if (*n < 0) {
|
|
*info = -2;
|
|
} else if (*lda < max(1, *n)) {
|
|
*info = -4;
|
|
} else if (*lwork < 1 && !lquery) {
|
|
*info = -9;
|
|
}
|
|
if (*info == 0) {
|
|
nb = ilaenv_(&c__1, (char *)"DSYTRD", uplo, n, &c_n1, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
|
|
i__1 = 1, i__2 = *n * nb;
|
|
lwkopt = max(i__1, i__2);
|
|
work[1] = (doublereal)lwkopt;
|
|
}
|
|
if (*info != 0) {
|
|
i__1 = -(*info);
|
|
xerbla_((char *)"DSYTRD", &i__1, (ftnlen)6);
|
|
return 0;
|
|
} else if (lquery) {
|
|
return 0;
|
|
}
|
|
if (*n == 0) {
|
|
work[1] = 1.;
|
|
return 0;
|
|
}
|
|
nx = *n;
|
|
iws = 1;
|
|
if (nb > 1 && nb < *n) {
|
|
i__1 = nb,
|
|
i__2 = ilaenv_(&c__3, (char *)"DSYTRD", uplo, n, &c_n1, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
|
|
nx = max(i__1, i__2);
|
|
if (nx < *n) {
|
|
ldwork = *n;
|
|
iws = ldwork * nb;
|
|
if (*lwork < iws) {
|
|
i__1 = *lwork / ldwork;
|
|
nb = max(i__1, 1);
|
|
nbmin =
|
|
ilaenv_(&c__2, (char *)"DSYTRD", uplo, n, &c_n1, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
|
|
if (nb < nbmin) {
|
|
nx = *n;
|
|
}
|
|
}
|
|
} else {
|
|
nx = *n;
|
|
}
|
|
} else {
|
|
nb = 1;
|
|
}
|
|
if (upper) {
|
|
kk = *n - (*n - nx + nb - 1) / nb * nb;
|
|
i__1 = kk + 1;
|
|
i__2 = -nb;
|
|
for (i__ = *n - nb + 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
|
|
i__3 = i__ + nb - 1;
|
|
dlatrd_(uplo, &i__3, &nb, &a[a_offset], lda, &e[1], &tau[1], &work[1], &ldwork,
|
|
(ftnlen)1);
|
|
i__3 = i__ - 1;
|
|
dsyr2k_(uplo, (char *)"N", &i__3, &nb, &c_b22, &a[i__ * a_dim1 + 1], lda, &work[1], &ldwork,
|
|
&c_b23, &a[a_offset], lda, (ftnlen)1, (ftnlen)1);
|
|
i__3 = i__ + nb - 1;
|
|
for (j = i__; j <= i__3; ++j) {
|
|
a[j - 1 + j * a_dim1] = e[j - 1];
|
|
d__[j] = a[j + j * a_dim1];
|
|
}
|
|
}
|
|
dsytd2_(uplo, &kk, &a[a_offset], lda, &d__[1], &e[1], &tau[1], &iinfo, (ftnlen)1);
|
|
} else {
|
|
i__2 = *n - nx;
|
|
i__1 = nb;
|
|
for (i__ = 1; i__1 < 0 ? i__ >= i__2 : i__ <= i__2; i__ += i__1) {
|
|
i__3 = *n - i__ + 1;
|
|
dlatrd_(uplo, &i__3, &nb, &a[i__ + i__ * a_dim1], lda, &e[i__], &tau[i__], &work[1],
|
|
&ldwork, (ftnlen)1);
|
|
i__3 = *n - i__ - nb + 1;
|
|
dsyr2k_(uplo, (char *)"N", &i__3, &nb, &c_b22, &a[i__ + nb + i__ * a_dim1], lda, &work[nb + 1],
|
|
&ldwork, &c_b23, &a[i__ + nb + (i__ + nb) * a_dim1], lda, (ftnlen)1, (ftnlen)1);
|
|
i__3 = i__ + nb - 1;
|
|
for (j = i__; j <= i__3; ++j) {
|
|
a[j + 1 + j * a_dim1] = e[j];
|
|
d__[j] = a[j + j * a_dim1];
|
|
}
|
|
}
|
|
i__1 = *n - i__ + 1;
|
|
dsytd2_(uplo, &i__1, &a[i__ + i__ * a_dim1], lda, &d__[i__], &e[i__], &tau[i__], &iinfo,
|
|
(ftnlen)1);
|
|
}
|
|
work[1] = (doublereal)lwkopt;
|
|
return 0;
|
|
}
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|