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28 *****************************************************************************
29 * Contents: Native middle-level C interface to LAPACK function sgbrfs
30 * Author: Intel Corporation
31 *****************************************************************************/
32
33 #include "lapacke_utils.h"
34
LAPACKE_sgbrfs_work(int matrix_layout,char trans,lapack_int n,lapack_int kl,lapack_int ku,lapack_int nrhs,const float * ab,lapack_int ldab,const float * afb,lapack_int ldafb,const lapack_int * ipiv,const float * b,lapack_int ldb,float * x,lapack_int ldx,float * ferr,float * berr,float * work,lapack_int * iwork)35 lapack_int LAPACKE_sgbrfs_work( int matrix_layout, char trans, lapack_int n,
36 lapack_int kl, lapack_int ku, lapack_int nrhs,
37 const float* ab, lapack_int ldab,
38 const float* afb, lapack_int ldafb,
39 const lapack_int* ipiv, const float* b,
40 lapack_int ldb, float* x, lapack_int ldx,
41 float* ferr, float* berr, float* work,
42 lapack_int* iwork )
43 {
44 lapack_int info = 0;
45 if( matrix_layout == LAPACK_COL_MAJOR ) {
46 /* Call LAPACK function and adjust info */
47 LAPACK_sgbrfs( &trans, &n, &kl, &ku, &nrhs, ab, &ldab, afb, &ldafb,
48 ipiv, b, &ldb, x, &ldx, ferr, berr, work, iwork, &info );
49 if( info < 0 ) {
50 info = info - 1;
51 }
52 } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
53 lapack_int ldab_t = MAX(1,kl+ku+1);
54 lapack_int ldafb_t = MAX(1,2*kl+ku+1);
55 lapack_int ldb_t = MAX(1,n);
56 lapack_int ldx_t = MAX(1,n);
57 float* ab_t = NULL;
58 float* afb_t = NULL;
59 float* b_t = NULL;
60 float* x_t = NULL;
61 /* Check leading dimension(s) */
62 if( ldab < n ) {
63 info = -8;
64 LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
65 return info;
66 }
67 if( ldafb < n ) {
68 info = -10;
69 LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
70 return info;
71 }
72 if( ldb < nrhs ) {
73 info = -13;
74 LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
75 return info;
76 }
77 if( ldx < nrhs ) {
78 info = -15;
79 LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
80 return info;
81 }
82 /* Allocate memory for temporary array(s) */
83 ab_t = (float*)LAPACKE_malloc( sizeof(float) * ldab_t * MAX(1,n) );
84 if( ab_t == NULL ) {
85 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
86 goto exit_level_0;
87 }
88 afb_t = (float*)LAPACKE_malloc( sizeof(float) * ldafb_t * MAX(1,n) );
89 if( afb_t == NULL ) {
90 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
91 goto exit_level_1;
92 }
93 b_t = (float*)LAPACKE_malloc( sizeof(float) * ldb_t * MAX(1,nrhs) );
94 if( b_t == NULL ) {
95 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
96 goto exit_level_2;
97 }
98 x_t = (float*)LAPACKE_malloc( sizeof(float) * ldx_t * MAX(1,nrhs) );
99 if( x_t == NULL ) {
100 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
101 goto exit_level_3;
102 }
103 /* Transpose input matrices */
104 LAPACKE_sgb_trans( matrix_layout, n, n, kl, ku, ab, ldab, ab_t, ldab_t );
105 LAPACKE_sgb_trans( matrix_layout, n, n, kl, kl+ku, afb, ldafb, afb_t,
106 ldafb_t );
107 LAPACKE_sge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
108 LAPACKE_sge_trans( matrix_layout, n, nrhs, x, ldx, x_t, ldx_t );
109 /* Call LAPACK function and adjust info */
110 LAPACK_sgbrfs( &trans, &n, &kl, &ku, &nrhs, ab_t, &ldab_t, afb_t,
111 &ldafb_t, ipiv, b_t, &ldb_t, x_t, &ldx_t, ferr, berr,
112 work, iwork, &info );
113 if( info < 0 ) {
114 info = info - 1;
115 }
116 /* Transpose output matrices */
117 LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, nrhs, x_t, ldx_t, x, ldx );
118 /* Release memory and exit */
119 LAPACKE_free( x_t );
120 exit_level_3:
121 LAPACKE_free( b_t );
122 exit_level_2:
123 LAPACKE_free( afb_t );
124 exit_level_1:
125 LAPACKE_free( ab_t );
126 exit_level_0:
127 if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
128 LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
129 }
130 } else {
131 info = -1;
132 LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
133 }
134 return info;
135 }
136