124 lines
3.5 KiB
C++
124 lines
3.5 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__2 = 2;
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int dsytrf_(char *uplo, integer *n, doublereal *a, integer *lda, integer *ipiv, doublereal *work,
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integer *lwork, integer *info, ftnlen uplo_len)
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{
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integer a_dim1, a_offset, i__1, i__2;
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integer j, k, kb, nb, iws;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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integer nbmin, iinfo;
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logical upper;
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extern int dsytf2_(char *, integer *, doublereal *, integer *, integer *, integer *, ftnlen),
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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 dlasyf_(char *, integer *, integer *, integer *, doublereal *, integer *, integer *,
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doublereal *, integer *, integer *, ftnlen);
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integer ldwork, lwkopt;
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logical lquery;
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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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--ipiv;
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--work;
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*info = 0;
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upper = lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)1);
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lquery = *lwork == -1;
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if (!upper && !lsame_(uplo, (char *)"L", (ftnlen)1, (ftnlen)1)) {
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*info = -1;
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} else if (*n < 0) {
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*info = -2;
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} else if (*lda < max(1, *n)) {
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*info = -4;
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} else if (*lwork < 1 && !lquery) {
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*info = -7;
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}
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if (*info == 0) {
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nb = ilaenv_(&c__1, (char *)"DSYTRF", uplo, n, &c_n1, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
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lwkopt = *n * nb;
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work[1] = (doublereal)lwkopt;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"DSYTRF", &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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nbmin = 2;
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ldwork = *n;
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if (nb > 1 && nb < *n) {
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iws = ldwork * nb;
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if (*lwork < iws) {
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i__1 = *lwork / ldwork;
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nb = max(i__1, 1);
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i__1 = 2,
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i__2 = ilaenv_(&c__2, (char *)"DSYTRF", uplo, n, &c_n1, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
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nbmin = max(i__1, i__2);
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}
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} else {
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iws = 1;
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}
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if (nb < nbmin) {
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nb = *n;
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}
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if (upper) {
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k = *n;
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L10:
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if (k < 1) {
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goto L40;
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}
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if (k > nb) {
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dlasyf_(uplo, &k, &nb, &kb, &a[a_offset], lda, &ipiv[1], &work[1], &ldwork, &iinfo,
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(ftnlen)1);
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} else {
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dsytf2_(uplo, &k, &a[a_offset], lda, &ipiv[1], &iinfo, (ftnlen)1);
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kb = k;
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}
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if (*info == 0 && iinfo > 0) {
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*info = iinfo;
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}
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k -= kb;
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goto L10;
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} else {
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k = 1;
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L20:
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if (k > *n) {
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goto L40;
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}
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if (k <= *n - nb) {
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i__1 = *n - k + 1;
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dlasyf_(uplo, &i__1, &nb, &kb, &a[k + k * a_dim1], lda, &ipiv[k], &work[1], &ldwork,
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&iinfo, (ftnlen)1);
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} else {
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i__1 = *n - k + 1;
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dsytf2_(uplo, &i__1, &a[k + k * a_dim1], lda, &ipiv[k], &iinfo, (ftnlen)1);
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kb = *n - k + 1;
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}
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if (*info == 0 && iinfo > 0) {
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*info = iinfo + k - 1;
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}
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i__1 = k + kb - 1;
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for (j = k; j <= i__1; ++j) {
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if (ipiv[j] > 0) {
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ipiv[j] = ipiv[j] + k - 1;
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} else {
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ipiv[j] = ipiv[j] - k + 1;
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}
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}
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k += kb;
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goto L20;
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}
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L40:
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work[1] = (doublereal)lwkopt;
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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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