135 lines
4.7 KiB
C++
135 lines
4.7 KiB
C++
#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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static integer c__1 = 1;
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static integer c_n1 = -1;
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static integer c__3 = 3;
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static integer c__2 = 2;
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int zungql_(integer *m, integer *n, integer *k, doublecomplex *a, integer *lda, doublecomplex *tau,
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doublecomplex *work, integer *lwork, integer *info)
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{
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integer a_dim1, a_offset, i__1, i__2, i__3, i__4, i__5;
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integer i__, j, l, ib, nb, kk, nx, iws, nbmin, iinfo;
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extern int zung2l_(integer *, integer *, integer *, doublecomplex *, integer *, doublecomplex *,
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doublecomplex *, integer *),
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xerbla_(char *, integer *, ftnlen);
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extern integer ilaenv_(integer *, char *, char *, integer *, integer *, integer *, integer *,
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ftnlen, ftnlen);
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extern int zlarfb_(char *, char *, char *, char *, integer *, integer *, integer *,
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doublecomplex *, integer *, doublecomplex *, integer *, doublecomplex *,
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integer *, doublecomplex *, integer *, ftnlen, ftnlen, ftnlen, ftnlen);
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integer ldwork;
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extern int zlarft_(char *, char *, integer *, integer *, doublecomplex *, integer *,
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doublecomplex *, doublecomplex *, integer *, ftnlen, ftnlen);
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logical lquery;
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integer lwkopt;
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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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--tau;
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--work;
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*info = 0;
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lquery = *lwork == -1;
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if (*m < 0) {
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*info = -1;
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} else if (*n < 0 || *n > *m) {
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*info = -2;
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} else if (*k < 0 || *k > *n) {
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*info = -3;
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} else if (*lda < max(1, *m)) {
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*info = -5;
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}
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if (*info == 0) {
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if (*n == 0) {
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lwkopt = 1;
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} else {
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nb = ilaenv_(&c__1, (char *)"ZUNGQL", (char *)" ", m, n, k, &c_n1, (ftnlen)6, (ftnlen)1);
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lwkopt = *n * nb;
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}
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work[1].r = (doublereal)lwkopt, work[1].i = 0.;
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if (*lwork < max(1, *n) && !lquery) {
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*info = -8;
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}
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"ZUNGQL", &i__1, (ftnlen)6);
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return 0;
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} else if (lquery) {
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return 0;
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}
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if (*n <= 0) {
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return 0;
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}
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nbmin = 2;
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nx = 0;
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iws = *n;
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if (nb > 1 && nb < *k) {
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i__1 = 0, i__2 = ilaenv_(&c__3, (char *)"ZUNGQL", (char *)" ", m, n, k, &c_n1, (ftnlen)6, (ftnlen)1);
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nx = max(i__1, i__2);
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if (nx < *k) {
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ldwork = *n;
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iws = ldwork * nb;
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if (*lwork < iws) {
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nb = *lwork / ldwork;
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i__1 = 2,
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i__2 = ilaenv_(&c__2, (char *)"ZUNGQL", (char *)" ", m, n, k, &c_n1, (ftnlen)6, (ftnlen)1);
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nbmin = max(i__1, i__2);
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}
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}
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}
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if (nb >= nbmin && nb < *k && nx < *k) {
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i__1 = *k, i__2 = (*k - nx + nb - 1) / nb * nb;
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kk = min(i__1, i__2);
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i__1 = *n - kk;
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for (j = 1; j <= i__1; ++j) {
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i__2 = *m;
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for (i__ = *m - kk + 1; i__ <= i__2; ++i__) {
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i__3 = i__ + j * a_dim1;
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a[i__3].r = 0., a[i__3].i = 0.;
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}
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}
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} else {
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kk = 0;
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}
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i__1 = *m - kk;
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i__2 = *n - kk;
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i__3 = *k - kk;
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zung2l_(&i__1, &i__2, &i__3, &a[a_offset], lda, &tau[1], &work[1], &iinfo);
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if (kk > 0) {
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i__1 = *k;
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i__2 = nb;
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for (i__ = *k - kk + 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
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i__3 = nb, i__4 = *k - i__ + 1;
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ib = min(i__3, i__4);
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if (*n - *k + i__ > 1) {
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i__3 = *m - *k + i__ + ib - 1;
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zlarft_((char *)"Backward", (char *)"Columnwise", &i__3, &ib, &a[(*n - *k + i__) * a_dim1 + 1], lda,
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&tau[i__], &work[1], &ldwork, (ftnlen)8, (ftnlen)10);
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i__3 = *m - *k + i__ + ib - 1;
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i__4 = *n - *k + i__ - 1;
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zlarfb_((char *)"Left", (char *)"No transpose", (char *)"Backward", (char *)"Columnwise", &i__3, &i__4, &ib,
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&a[(*n - *k + i__) * a_dim1 + 1], lda, &work[1], &ldwork, &a[a_offset], lda,
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&work[ib + 1], &ldwork, (ftnlen)4, (ftnlen)12, (ftnlen)8, (ftnlen)10);
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}
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i__3 = *m - *k + i__ + ib - 1;
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zung2l_(&i__3, &ib, &ib, &a[(*n - *k + i__) * a_dim1 + 1], lda, &tau[i__], &work[1],
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&iinfo);
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i__3 = *n - *k + i__ + ib - 1;
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for (j = *n - *k + i__; j <= i__3; ++j) {
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i__4 = *m;
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for (l = *m - *k + i__ + ib; l <= i__4; ++l) {
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i__5 = l + j * a_dim1;
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a[i__5].r = 0., a[i__5].i = 0.;
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}
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}
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}
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}
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work[1].r = (doublereal)iws, work[1].i = 0.;
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return 0;
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}
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#ifdef __cplusplus
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}
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#endif
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