110 lines
4.4 KiB
C++
110 lines
4.4 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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static doublereal c_b18 = 1.;
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static doublereal c_b22 = -1.;
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int dtrtri_(char *uplo, char *diag, integer *n, doublereal *a, integer *lda, integer *info,
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ftnlen uplo_len, ftnlen diag_len)
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{
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address a__1[2];
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integer a_dim1, a_offset, i__1, i__2[2], i__3, i__4, i__5;
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char ch__1[2];
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int s_lmp_cat(char *, char **, integer *, integer *, ftnlen);
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integer j, jb, nb, nn;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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extern int dtrmm_(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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dtrsm_(char *, char *, char *, char *, integer *, integer *, doublereal *, doublereal *,
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integer *, doublereal *, integer *, ftnlen, ftnlen, ftnlen, ftnlen);
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logical upper;
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extern int dtrti2_(char *, char *, integer *, doublereal *, integer *, integer *, 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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logical nounit;
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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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nounit = lsame_(diag, (char *)"N", (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 (!nounit && !lsame_(diag, (char *)"U", (ftnlen)1, (ftnlen)1)) {
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*info = -2;
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} else if (*n < 0) {
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*info = -3;
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} else if (*lda < max(1, *n)) {
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*info = -5;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"DTRTRI", &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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if (nounit) {
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i__1 = *n;
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for (*info = 1; *info <= i__1; ++(*info)) {
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if (a[*info + *info * a_dim1] == 0.) {
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return 0;
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}
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}
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*info = 0;
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}
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i__2[0] = 1, a__1[0] = uplo;
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i__2[1] = 1, a__1[1] = diag;
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s_lmp_cat(ch__1, a__1, i__2, &c__2, (ftnlen)2);
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nb = ilaenv_(&c__1, (char *)"DTRTRI", ch__1, n, &c_n1, &c_n1, &c_n1, (ftnlen)6, (ftnlen)2);
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if (nb <= 1 || nb >= *n) {
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dtrti2_(uplo, diag, n, &a[a_offset], lda, info, (ftnlen)1, (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__3 = nb;
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for (j = 1; i__3 < 0 ? j >= i__1 : j <= i__1; j += i__3) {
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i__4 = nb, i__5 = *n - j + 1;
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jb = min(i__4, i__5);
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i__4 = j - 1;
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dtrmm_((char *)"Left", (char *)"Upper", (char *)"No transpose", diag, &i__4, &jb, &c_b18, &a[a_offset], lda,
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&a[j * a_dim1 + 1], lda, (ftnlen)4, (ftnlen)5, (ftnlen)12, (ftnlen)1);
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i__4 = j - 1;
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dtrsm_((char *)"Right", (char *)"Upper", (char *)"No transpose", diag, &i__4, &jb, &c_b22,
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&a[j + j * a_dim1], lda, &a[j * a_dim1 + 1], lda, (ftnlen)5, (ftnlen)5,
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(ftnlen)12, (ftnlen)1);
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dtrti2_((char *)"Upper", diag, &jb, &a[j + j * a_dim1], lda, info, (ftnlen)5, (ftnlen)1);
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}
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} else {
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nn = (*n - 1) / nb * nb + 1;
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i__3 = -nb;
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for (j = nn; i__3 < 0 ? j >= 1 : j <= 1; j += i__3) {
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i__1 = nb, i__4 = *n - j + 1;
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jb = min(i__1, i__4);
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if (j + jb <= *n) {
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i__1 = *n - j - jb + 1;
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dtrmm_((char *)"Left", (char *)"Lower", (char *)"No transpose", diag, &i__1, &jb, &c_b18,
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&a[j + jb + (j + jb) * a_dim1], lda, &a[j + jb + j * a_dim1], lda,
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(ftnlen)4, (ftnlen)5, (ftnlen)12, (ftnlen)1);
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i__1 = *n - j - jb + 1;
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dtrsm_((char *)"Right", (char *)"Lower", (char *)"No transpose", diag, &i__1, &jb, &c_b22,
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&a[j + j * a_dim1], lda, &a[j + jb + j * a_dim1], lda, (ftnlen)5,
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(ftnlen)5, (ftnlen)12, (ftnlen)1);
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}
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dtrti2_((char *)"Lower", diag, &jb, &a[j + j * a_dim1], lda, info, (ftnlen)5, (ftnlen)1);
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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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