91 lines
3.5 KiB
C++
91 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 doublereal c_b16 = 1.;
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static doublereal c_b19 = -1.;
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int dgetrf_(integer *m, integer *n, doublereal *a, integer *lda, integer *ipiv, 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, jb, nb;
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extern int dgemm_(char *, char *, integer *, integer *, integer *, doublereal *, doublereal *,
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integer *, doublereal *, integer *, doublereal *, doublereal *, integer *,
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ftnlen, ftnlen);
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integer iinfo;
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extern int dtrsm_(char *, char *, char *, char *, integer *, integer *, doublereal *,
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doublereal *, integer *, doublereal *, integer *, ftnlen, ftnlen, ftnlen,
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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 dlaswp_(integer *, doublereal *, integer *, integer *, integer *, integer *,
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integer *),
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dgetrf2_(integer *, integer *, doublereal *, integer *, integer *, integer *);
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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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*info = 0;
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if (*m < 0) {
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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, *m)) {
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*info = -4;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"DGETRF", &i__1, (ftnlen)6);
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return 0;
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}
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if (*m == 0 || *n == 0) {
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return 0;
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}
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nb = ilaenv_(&c__1, (char *)"DGETRF", (char *)" ", m, n, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
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if (nb <= 1 || nb >= min(*m, *n)) {
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dgetrf2_(m, n, &a[a_offset], lda, &ipiv[1], info);
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} else {
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i__1 = min(*m, *n);
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i__2 = nb;
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for (j = 1; i__2 < 0 ? j >= i__1 : j <= i__1; j += i__2) {
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i__3 = min(*m, *n) - j + 1;
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jb = min(i__3, nb);
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i__3 = *m - j + 1;
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dgetrf2_(&i__3, &jb, &a[j + j * a_dim1], lda, &ipiv[j], &iinfo);
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if (*info == 0 && iinfo > 0) {
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*info = iinfo + j - 1;
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}
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i__4 = *m, i__5 = j + jb - 1;
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i__3 = min(i__4, i__5);
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for (i__ = j; i__ <= i__3; ++i__) {
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ipiv[i__] = j - 1 + ipiv[i__];
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}
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i__3 = j - 1;
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i__4 = j + jb - 1;
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dlaswp_(&i__3, &a[a_offset], lda, &j, &i__4, &ipiv[1], &c__1);
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if (j + jb <= *n) {
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i__3 = *n - j - jb + 1;
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i__4 = j + jb - 1;
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dlaswp_(&i__3, &a[(j + jb) * a_dim1 + 1], lda, &j, &i__4, &ipiv[1], &c__1);
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i__3 = *n - j - jb + 1;
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dtrsm_((char *)"Left", (char *)"Lower", (char *)"No transpose", (char *)"Unit", &jb, &i__3, &c_b16,
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&a[j + j * a_dim1], lda, &a[j + (j + jb) * a_dim1], lda, (ftnlen)4,
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(ftnlen)5, (ftnlen)12, (ftnlen)4);
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if (j + jb <= *m) {
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i__3 = *m - j - jb + 1;
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i__4 = *n - j - jb + 1;
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dgemm_((char *)"No transpose", (char *)"No transpose", &i__3, &i__4, &jb, &c_b19,
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&a[j + jb + j * a_dim1], lda, &a[j + (j + jb) * a_dim1], lda, &c_b16,
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&a[j + jb + (j + jb) * a_dim1], lda, (ftnlen)12, (ftnlen)12);
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}
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}
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}
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}
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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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