lapacke_ssysvx_work.c

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* Contents: Native middle-level C interface to LAPACK function ssysvx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_ssysvx_work( int matrix_layout, char fact, char uplo,
                                lapack_int n, lapack_int nrhs, const float* a,
                                lapack_int lda, float* af, lapack_int ldaf,
                                lapack_int* ipiv, const float* b,
                                lapack_int ldb, float* x, lapack_int ldx,
                                float* rcond, float* ferr, float* berr,
                                float* work, lapack_int lwork,
                                lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_ssysvx( &fact, &uplo, &n, &nrhs, a, &lda, af, &ldaf, ipiv, b,
                       &ldb, x, &ldx, rcond, ferr, berr, work, &lwork, iwork,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,n);
        lapack_int ldaf_t = MAX(1,n);
        lapack_int ldb_t = MAX(1,n);
        lapack_int ldx_t = MAX(1,n);
        float* a_t = NULL;
        float* af_t = NULL;
        float* b_t = NULL;
        float* x_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_ssysvx_work", info );
            return info;
        }
        if( ldaf < n ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_ssysvx_work", info );
            return info;
        }
        if( ldb < nrhs ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_ssysvx_work", info );
            return info;
        }
        if( ldx < nrhs ) {
            info = -14;
            LAPACKE_xerbla( "LAPACKE_ssysvx_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_ssysvx( &fact, &uplo, &n, &nrhs, a, &lda_t, af, &ldaf_t,
                           ipiv, b, &ldb_t, x, &ldx_t, rcond, ferr, berr, work,
                           &lwork, iwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        af_t = (float*)LAPACKE_malloc( sizeof(float) * ldaf_t * MAX(1,n) );
        if( af_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        b_t = (float*)LAPACKE_malloc( sizeof(float) * ldb_t * MAX(1,nrhs) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_2;
        }
        x_t = (float*)LAPACKE_malloc( sizeof(float) * ldx_t * MAX(1,nrhs) );
        if( x_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_3;
        }
        /* Transpose input matrices */
        LAPACKE_ssy_trans( matrix_layout, uplo, n, a, lda, a_t, lda_t );
        if( LAPACKE_lsame( fact, 'f' ) ) {
            LAPACKE_ssy_trans( matrix_layout, uplo, n, af, ldaf, af_t, ldaf_t );
        }
        LAPACKE_sge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_ssysvx( &fact, &uplo, &n, &nrhs, a_t, &lda_t, af_t, &ldaf_t,
                       ipiv, b_t, &ldb_t, x_t, &ldx_t, rcond, ferr, berr, work,
                       &lwork, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if( LAPACKE_lsame( fact, 'n' ) ) {
            LAPACKE_ssy_trans( LAPACK_COL_MAJOR, uplo, n, af_t, ldaf_t, af,
                               ldaf );
        }
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, nrhs, x_t, ldx_t, x, ldx );
        /* Release memory and exit */
        LAPACKE_free( x_t );
exit_level_3:
        LAPACKE_free( b_t );
exit_level_2:
        LAPACKE_free( af_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_ssysvx_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_ssysvx_work", info );
    }
    return info;
}