196 lines
10 KiB
C++
196 lines
10 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 doublecomplex c_b1 = {1., 0.};
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static doublecomplex c_b2 = {.5, 0.};
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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_b18 = 1.;
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int zhegst_(integer *itype, char *uplo, integer *n, doublecomplex *a, integer *lda,
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doublecomplex *b, integer *ldb, integer *info, ftnlen uplo_len)
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{
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integer a_dim1, a_offset, b_dim1, b_offset, i__1, i__2, i__3;
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doublecomplex z__1;
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integer k, kb, nb;
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extern logical lsame_(char *, char *, ftnlen, ftnlen);
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extern int zhemm_(char *, char *, integer *, integer *, doublecomplex *, doublecomplex *,
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integer *, doublecomplex *, integer *, doublecomplex *, doublecomplex *,
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integer *, ftnlen, ftnlen);
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logical upper;
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extern int ztrmm_(char *, char *, char *, char *, integer *, integer *, doublecomplex *,
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doublecomplex *, integer *, doublecomplex *, integer *, ftnlen, ftnlen,
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ftnlen, ftnlen),
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ztrsm_(char *, char *, char *, char *, integer *, integer *, doublecomplex *,
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doublecomplex *, integer *, doublecomplex *, integer *, ftnlen, ftnlen, ftnlen,
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ftnlen),
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zhegs2_(integer *, char *, integer *, doublecomplex *, integer *, doublecomplex *,
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integer *, integer *, ftnlen),
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zher2k_(char *, char *, integer *, integer *, doublecomplex *, doublecomplex *, integer *,
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doublecomplex *, integer *, doublereal *, doublecomplex *, 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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a_dim1 = *lda;
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a_offset = 1 + a_dim1;
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a -= a_offset;
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b_dim1 = *ldb;
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b_offset = 1 + b_dim1;
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b -= b_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 (*itype < 1 || *itype > 3) {
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*info = -1;
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} else if (!upper && !lsame_(uplo, (char *)"L", (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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} else if (*ldb < max(1, *n)) {
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*info = -7;
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}
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if (*info != 0) {
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i__1 = -(*info);
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xerbla_((char *)"ZHEGST", &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 *)"ZHEGST", 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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zhegs2_(itype, uplo, n, &a[a_offset], lda, &b[b_offset], ldb, info, (ftnlen)1);
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} else {
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if (*itype == 1) {
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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 (k = 1; i__2 < 0 ? k >= i__1 : k <= i__1; k += i__2) {
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i__3 = *n - k + 1;
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kb = min(i__3, nb);
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zhegs2_(itype, uplo, &kb, &a[k + k * a_dim1], lda, &b[k + k * b_dim1], ldb,
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info, (ftnlen)1);
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if (k + kb <= *n) {
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i__3 = *n - k - kb + 1;
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ztrsm_((char *)"L", uplo, (char *)"C", (char *)"N", &kb, &i__3, &c_b1, &b[k + k * b_dim1], ldb,
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&a[k + (k + kb) * a_dim1], lda, (ftnlen)1, (ftnlen)1, (ftnlen)1,
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(ftnlen)1);
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i__3 = *n - k - kb + 1;
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z__1.r = -.5, z__1.i = -0.;
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zhemm_((char *)"L", uplo, &kb, &i__3, &z__1, &a[k + k * a_dim1], lda,
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&b[k + (k + kb) * b_dim1], ldb, &c_b1, &a[k + (k + kb) * a_dim1],
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lda, (ftnlen)1, (ftnlen)1);
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i__3 = *n - k - kb + 1;
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z__1.r = -1., z__1.i = -0.;
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zher2k_(uplo, (char *)"C", &i__3, &kb, &z__1, &a[k + (k + kb) * a_dim1], lda,
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&b[k + (k + kb) * b_dim1], ldb, &c_b18,
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&a[k + kb + (k + kb) * a_dim1], lda, (ftnlen)1, (ftnlen)1);
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i__3 = *n - k - kb + 1;
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z__1.r = -.5, z__1.i = -0.;
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zhemm_((char *)"L", uplo, &kb, &i__3, &z__1, &a[k + k * a_dim1], lda,
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&b[k + (k + kb) * b_dim1], ldb, &c_b1, &a[k + (k + kb) * a_dim1],
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lda, (ftnlen)1, (ftnlen)1);
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i__3 = *n - k - kb + 1;
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ztrsm_((char *)"R", uplo, (char *)"N", (char *)"N", &kb, &i__3, &c_b1,
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&b[k + kb + (k + kb) * b_dim1], ldb, &a[k + (k + kb) * a_dim1], lda,
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(ftnlen)1, (ftnlen)1, (ftnlen)1, (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 (k = 1; i__1 < 0 ? k >= i__2 : k <= i__2; k += i__1) {
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i__3 = *n - k + 1;
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kb = min(i__3, nb);
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zhegs2_(itype, uplo, &kb, &a[k + k * a_dim1], lda, &b[k + k * b_dim1], ldb,
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info, (ftnlen)1);
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if (k + kb <= *n) {
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i__3 = *n - k - kb + 1;
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ztrsm_((char *)"R", uplo, (char *)"C", (char *)"N", &i__3, &kb, &c_b1, &b[k + k * b_dim1], ldb,
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&a[k + kb + k * a_dim1], lda, (ftnlen)1, (ftnlen)1, (ftnlen)1,
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(ftnlen)1);
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i__3 = *n - k - kb + 1;
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z__1.r = -.5, z__1.i = -0.;
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zhemm_((char *)"R", uplo, &i__3, &kb, &z__1, &a[k + k * a_dim1], lda,
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&b[k + kb + k * b_dim1], ldb, &c_b1, &a[k + kb + k * a_dim1], lda,
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(ftnlen)1, (ftnlen)1);
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i__3 = *n - k - kb + 1;
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z__1.r = -1., z__1.i = -0.;
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zher2k_(uplo, (char *)"N", &i__3, &kb, &z__1, &a[k + kb + k * a_dim1], lda,
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&b[k + kb + k * b_dim1], ldb, &c_b18,
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&a[k + kb + (k + kb) * a_dim1], lda, (ftnlen)1, (ftnlen)1);
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i__3 = *n - k - kb + 1;
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z__1.r = -.5, z__1.i = -0.;
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zhemm_((char *)"R", uplo, &i__3, &kb, &z__1, &a[k + k * a_dim1], lda,
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&b[k + kb + k * b_dim1], ldb, &c_b1, &a[k + kb + k * a_dim1], lda,
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(ftnlen)1, (ftnlen)1);
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i__3 = *n - k - kb + 1;
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ztrsm_((char *)"L", uplo, (char *)"N", (char *)"N", &i__3, &kb, &c_b1,
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&b[k + kb + (k + kb) * b_dim1], ldb, &a[k + kb + k * a_dim1], lda,
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(ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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}
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}
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}
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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 (k = 1; i__2 < 0 ? k >= i__1 : k <= i__1; k += i__2) {
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i__3 = *n - k + 1;
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kb = min(i__3, nb);
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i__3 = k - 1;
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ztrmm_((char *)"L", uplo, (char *)"N", (char *)"N", &i__3, &kb, &c_b1, &b[b_offset], ldb,
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&a[k * a_dim1 + 1], lda, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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i__3 = k - 1;
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zhemm_((char *)"R", uplo, &i__3, &kb, &c_b2, &a[k + k * a_dim1], lda,
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&b[k * b_dim1 + 1], ldb, &c_b1, &a[k * a_dim1 + 1], lda, (ftnlen)1,
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(ftnlen)1);
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i__3 = k - 1;
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zher2k_(uplo, (char *)"N", &i__3, &kb, &c_b1, &a[k * a_dim1 + 1], lda,
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&b[k * b_dim1 + 1], ldb, &c_b18, &a[a_offset], lda, (ftnlen)1,
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(ftnlen)1);
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i__3 = k - 1;
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zhemm_((char *)"R", uplo, &i__3, &kb, &c_b2, &a[k + k * a_dim1], lda,
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&b[k * b_dim1 + 1], ldb, &c_b1, &a[k * a_dim1 + 1], lda, (ftnlen)1,
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(ftnlen)1);
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i__3 = k - 1;
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ztrmm_((char *)"R", uplo, (char *)"C", (char *)"N", &i__3, &kb, &c_b1, &b[k + k * b_dim1], ldb,
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&a[k * a_dim1 + 1], lda, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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zhegs2_(itype, uplo, &kb, &a[k + k * a_dim1], lda, &b[k + k * b_dim1], ldb,
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info, (ftnlen)1);
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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 (k = 1; i__1 < 0 ? k >= i__2 : k <= i__2; k += i__1) {
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i__3 = *n - k + 1;
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kb = min(i__3, nb);
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i__3 = k - 1;
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ztrmm_((char *)"R", uplo, (char *)"N", (char *)"N", &kb, &i__3, &c_b1, &b[b_offset], ldb,
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&a[k + a_dim1], lda, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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i__3 = k - 1;
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zhemm_((char *)"L", uplo, &kb, &i__3, &c_b2, &a[k + k * a_dim1], lda, &b[k + b_dim1],
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ldb, &c_b1, &a[k + a_dim1], lda, (ftnlen)1, (ftnlen)1);
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i__3 = k - 1;
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zher2k_(uplo, (char *)"C", &i__3, &kb, &c_b1, &a[k + a_dim1], lda, &b[k + b_dim1], ldb,
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&c_b18, &a[a_offset], lda, (ftnlen)1, (ftnlen)1);
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i__3 = k - 1;
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zhemm_((char *)"L", uplo, &kb, &i__3, &c_b2, &a[k + k * a_dim1], lda, &b[k + b_dim1],
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ldb, &c_b1, &a[k + a_dim1], lda, (ftnlen)1, (ftnlen)1);
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i__3 = k - 1;
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ztrmm_((char *)"L", uplo, (char *)"C", (char *)"N", &kb, &i__3, &c_b1, &b[k + k * b_dim1], ldb,
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&a[k + a_dim1], lda, (ftnlen)1, (ftnlen)1, (ftnlen)1, (ftnlen)1);
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zhegs2_(itype, uplo, &kb, &a[k + k * a_dim1], lda, &b[k + k * b_dim1], ldb,
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info, (ftnlen)1);
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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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