112 lines
4.6 KiB
C++
112 lines
4.6 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_b13 = -1.;
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static doublereal c_b14 = 1.;
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int dpotrf_(char *uplo, integer *n, doublereal *a, integer *lda, integer *info, ftnlen uplo_len)
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{
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integer a_dim1, a_offset, i__1, i__2, i__3, i__4;
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integer 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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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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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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logical upper;
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extern int dsyrk_(char *, char *, integer *, integer *, doublereal *, doublereal *, integer *,
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doublereal *, doublereal *, integer *, ftnlen, 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 dpotrf2_(char *, integer *, doublereal *, integer *, integer *, ftnlen);
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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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*info = 0;
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upper = lsame_(uplo, (char *)"U", (ftnlen)1, (ftnlen)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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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"DPOTRF", &i__1, (ftnlen)6);
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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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nb = ilaenv_(&c__1, (char *)"DPOTRF", uplo, n, &c_n1, &c_n1, &c_n1, (ftnlen)6, (ftnlen)1);
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if (nb <= 1 || nb >= *n) {
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dpotrf2_(uplo, n, &a[a_offset], lda, info, (ftnlen)1);
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} else {
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if (upper) {
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i__1 = *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 = nb, i__4 = *n - j + 1;
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jb = min(i__3, i__4);
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i__3 = j - 1;
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dsyrk_((char *)"U", (char *)"T", &jb, &i__3, &c_b13, &a[j * a_dim1 + 1], lda, &c_b14,
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&a[j + j * a_dim1], lda, (ftnlen)1, (ftnlen)1);
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dpotrf2_((char *)"U", &jb, &a[j + j * a_dim1], lda, info, (ftnlen)1);
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if (*info != 0) {
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goto L30;
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}
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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 - 1;
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dgemm_((char *)"T", (char *)"N", &jb, &i__3, &i__4, &c_b13, &a[j * a_dim1 + 1], lda,
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&a[(j + jb) * a_dim1 + 1], lda, &c_b14, &a[j + (j + jb) * a_dim1], lda,
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(ftnlen)1, (ftnlen)1);
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i__3 = *n - j - jb + 1;
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dtrsm_((char *)"L", (char *)"U", (char *)"T", (char *)"N", &jb, &i__3, &c_b14, &a[j + j * a_dim1], lda,
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&a[j + (j + jb) * a_dim1], lda, (ftnlen)1, (ftnlen)1, (ftnlen)1,
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(ftnlen)1);
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}
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}
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} else {
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i__2 = *n;
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i__1 = nb;
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for (j = 1; i__1 < 0 ? j >= i__2 : j <= i__2; j += i__1) {
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i__3 = nb, i__4 = *n - j + 1;
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jb = min(i__3, i__4);
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i__3 = j - 1;
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dsyrk_((char *)"L", (char *)"N", &jb, &i__3, &c_b13, &a[j + a_dim1], lda, &c_b14,
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&a[j + j * a_dim1], lda, (ftnlen)1, (ftnlen)1);
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dpotrf2_((char *)"L", &jb, &a[j + j * a_dim1], lda, info, (ftnlen)1);
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if (*info != 0) {
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goto L30;
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}
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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 - 1;
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dgemm_((char *)"N", (char *)"T", &i__3, &jb, &i__4, &c_b13, &a[j + jb + a_dim1], lda,
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&a[j + a_dim1], lda, &c_b14, &a[j + jb + j * a_dim1], lda, (ftnlen)1,
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(ftnlen)1);
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i__3 = *n - j - jb + 1;
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dtrsm_((char *)"R", (char *)"L", (char *)"T", (char *)"N", &i__3, &jb, &c_b14, &a[j + j * a_dim1], lda,
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&a[j + jb + j * a_dim1], lda, (ftnlen)1, (ftnlen)1, (ftnlen)1,
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(ftnlen)1);
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}
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}
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}
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}
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goto L40;
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L30:
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*info = *info + j - 1;
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L40:
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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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