#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_b21 = -1.;
static doublereal c_b22 = 1.;
int dgebrd_(integer *m, integer *n, doublereal *a, integer *lda, doublereal *d__, doublereal *e,
            doublereal *tauq, doublereal *taup, doublereal *work, integer *lwork, integer *info)
{
    integer a_dim1, a_offset, i__1, i__2, i__3, i__4;
    integer i__, j, nb, nx, ws;
    extern int dgemm_(char *, char *, integer *, integer *, integer *, doublereal *, doublereal *,
                      integer *, doublereal *, integer *, doublereal *, doublereal *, integer *,
                      ftnlen, ftnlen);
    integer nbmin, iinfo, minmn;
    extern int dgebd2_(integer *, integer *, doublereal *, integer *, doublereal *, doublereal *,
                       doublereal *, doublereal *, doublereal *, integer *),
        dlabrd_(integer *, integer *, integer *, doublereal *, integer *, doublereal *,
                doublereal *, doublereal *, doublereal *, doublereal *, integer *, doublereal *,
                integer *),
        xerbla_(char *, integer *, ftnlen);
    extern integer ilaenv_(integer *, char *, char *, integer *, integer *, integer *, integer *,
                           ftnlen, ftnlen);
    integer lwkmin, ldwrkx, ldwrky, lwkopt;
    logical lquery;
    a_dim1 = *lda;
    a_offset = 1 + a_dim1;
    a -= a_offset;
    --d__;
    --e;
    --tauq;
    --taup;
    --work;
    *info = 0;
    minmn = min(*m, *n);
    if (minmn == 0) {
        lwkmin = 1;
        lwkopt = 1;
    } else {
        lwkmin = max(*m, *n);
        i__1 = 1, i__2 = ilaenv_(&c__1, (char *)"DGEBRD", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
        nb = max(i__1, i__2);
        lwkopt = (*m + *n) * nb;
    }
    work[1] = (doublereal)lwkopt;
    lquery = *lwork == -1;
    if (*m < 0) {
        *info = -1;
    } else if (*n < 0) {
        *info = -2;
    } else if (*lda < max(1, *m)) {
        *info = -4;
    } else if (*lwork < lwkmin && !lquery) {
        *info = -10;
    }
    if (*info < 0) {
        i__1 = -(*info);
        xerbla_((char *)"DGEBRD", &i__1, (ftnlen)6);
        return 0;
    } else if (lquery) {
        return 0;
    }
    if (minmn == 0) {
        work[1] = 1.;
        return 0;
    }
    ws = max(*m, *n);
    ldwrkx = *m;
    ldwrky = *n;
    if (nb > 1 && nb < minmn) {
        i__1 = nb, i__2 = ilaenv_(&c__3, (char *)"DGEBRD", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
        nx = max(i__1, i__2);
        if (nx < minmn) {
            ws = lwkopt;
            if (*lwork < ws) {
                nbmin = ilaenv_(&c__2, (char *)"DGEBRD", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
                if (*lwork >= (*m + *n) * nbmin) {
                    nb = *lwork / (*m + *n);
                } else {
                    nb = 1;
                    nx = minmn;
                }
            }
        }
    } else {
        nx = minmn;
    }
    i__1 = minmn - nx;
    i__2 = nb;
    for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
        i__3 = *m - i__ + 1;
        i__4 = *n - i__ + 1;
        dlabrd_(&i__3, &i__4, &nb, &a[i__ + i__ * a_dim1], lda, &d__[i__], &e[i__], &tauq[i__],
                &taup[i__], &work[1], &ldwrkx, &work[ldwrkx * nb + 1], &ldwrky);
        i__3 = *m - i__ - nb + 1;
        i__4 = *n - i__ - nb + 1;
        dgemm_((char *)"N", (char *)"T", &i__3, &i__4, &nb, &c_b21, &a[i__ + nb + i__ * a_dim1], lda,
               &work[ldwrkx * nb + nb + 1], &ldwrky, &c_b22, &a[i__ + nb + (i__ + nb) * a_dim1],
               lda, (ftnlen)1, (ftnlen)1);
        i__3 = *m - i__ - nb + 1;
        i__4 = *n - i__ - nb + 1;
        dgemm_((char *)"N", (char *)"N", &i__3, &i__4, &nb, &c_b21, &work[nb + 1], &ldwrkx,
               &a[i__ + (i__ + nb) * a_dim1], lda, &c_b22, &a[i__ + nb + (i__ + nb) * a_dim1], lda,
               (ftnlen)1, (ftnlen)1);
        if (*m >= *n) {
            i__3 = i__ + nb - 1;
            for (j = i__; j <= i__3; ++j) {
                a[j + j * a_dim1] = d__[j];
                a[j + (j + 1) * a_dim1] = e[j];
            }
        } else {
            i__3 = i__ + nb - 1;
            for (j = i__; j <= i__3; ++j) {
                a[j + j * a_dim1] = d__[j];
                a[j + 1 + j * a_dim1] = e[j];
            }
        }
    }
    i__2 = *m - i__ + 1;
    i__1 = *n - i__ + 1;
    dgebd2_(&i__2, &i__1, &a[i__ + i__ * a_dim1], lda, &d__[i__], &e[i__], &tauq[i__], &taup[i__],
            &work[1], &iinfo);
    work[1] = (doublereal)ws;
    return 0;
}
#ifdef __cplusplus
}
#endif