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28 *****************************************************************************
29 * Contents: Native middle-level C interface to LAPACK function zheevx
30 * Author: Intel Corporation
31 *****************************************************************************/
32
33 #include "lapacke_utils.h"
34
LAPACKE_zheevx_work(int matrix_layout,char jobz,char range,char uplo,lapack_int n,lapack_complex_double * a,lapack_int lda,double vl,double vu,lapack_int il,lapack_int iu,double abstol,lapack_int * m,double * w,lapack_complex_double * z,lapack_int ldz,lapack_complex_double * work,lapack_int lwork,double * rwork,lapack_int * iwork,lapack_int * ifail)35 lapack_int LAPACKE_zheevx_work( int matrix_layout, char jobz, char range,
36 char uplo, lapack_int n,
37 lapack_complex_double* a, lapack_int lda,
38 double vl, double vu, lapack_int il,
39 lapack_int iu, double abstol, lapack_int* m,
40 double* w, lapack_complex_double* z,
41 lapack_int ldz, lapack_complex_double* work,
42 lapack_int lwork, double* rwork,
43 lapack_int* iwork, lapack_int* ifail )
44 {
45 lapack_int info = 0;
46 if( matrix_layout == LAPACK_COL_MAJOR ) {
47 /* Call LAPACK function and adjust info */
48 LAPACK_zheevx( &jobz, &range, &uplo, &n, a, &lda, &vl, &vu, &il, &iu,
49 &abstol, m, w, z, &ldz, work, &lwork, rwork, iwork,
50 ifail, &info );
51 if( info < 0 ) {
52 info = info - 1;
53 }
54 } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
55 lapack_int ncols_z = ( !LAPACKE_lsame( jobz, 'v' ) ) ? 1 :
56 ( LAPACKE_lsame( range, 'a' ) ||
57 LAPACKE_lsame( range, 'v' ) ) ? n :
58 ( LAPACKE_lsame( range, 'i' ) ? (iu-il+1) : 1);
59 lapack_int lda_t = MAX(1,n);
60 lapack_int ldz_t = MAX(1,n);
61 lapack_complex_double* a_t = NULL;
62 lapack_complex_double* z_t = NULL;
63 /* Check leading dimension(s) */
64 if( lda < n ) {
65 info = -7;
66 LAPACKE_xerbla( "LAPACKE_zheevx_work", info );
67 return info;
68 }
69 if( ldz < ncols_z ) {
70 info = -16;
71 LAPACKE_xerbla( "LAPACKE_zheevx_work", info );
72 return info;
73 }
74 /* Query optimal working array(s) size if requested */
75 if( lwork == -1 ) {
76 LAPACK_zheevx( &jobz, &range, &uplo, &n, a, &lda_t, &vl, &vu, &il,
77 &iu, &abstol, m, w, z, &ldz_t, work, &lwork, rwork,
78 iwork, ifail, &info );
79 return (info < 0) ? (info - 1) : info;
80 }
81 /* Allocate memory for temporary array(s) */
82 a_t = (lapack_complex_double*)
83 LAPACKE_malloc( sizeof(lapack_complex_double) * lda_t * MAX(1,n) );
84 if( a_t == NULL ) {
85 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
86 goto exit_level_0;
87 }
88 if( LAPACKE_lsame( jobz, 'v' ) ) {
89 z_t = (lapack_complex_double*)
90 LAPACKE_malloc( sizeof(lapack_complex_double) *
91 ldz_t * MAX(1,ncols_z) );
92 if( z_t == NULL ) {
93 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
94 goto exit_level_1;
95 }
96 }
97 /* Transpose input matrices */
98 LAPACKE_zhe_trans( matrix_layout, uplo, n, a, lda, a_t, lda_t );
99 /* Call LAPACK function and adjust info */
100 LAPACK_zheevx( &jobz, &range, &uplo, &n, a_t, &lda_t, &vl, &vu, &il,
101 &iu, &abstol, m, w, z_t, &ldz_t, work, &lwork, rwork,
102 iwork, ifail, &info );
103 if( info < 0 ) {
104 info = info - 1;
105 }
106 /* Transpose output matrices */
107 LAPACKE_zhe_trans( LAPACK_COL_MAJOR, uplo, n, a_t, lda_t, a, lda );
108 if( LAPACKE_lsame( jobz, 'v' ) ) {
109 LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, ncols_z, z_t, ldz_t, z,
110 ldz );
111 }
112 /* Release memory and exit */
113 if( LAPACKE_lsame( jobz, 'v' ) ) {
114 LAPACKE_free( z_t );
115 }
116 exit_level_1:
117 LAPACKE_free( a_t );
118 exit_level_0:
119 if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
120 LAPACKE_xerbla( "LAPACKE_zheevx_work", info );
121 }
122 } else {
123 info = -1;
124 LAPACKE_xerbla( "LAPACKE_zheevx_work", info );
125 }
126 return info;
127 }
128