Add a LAPACKE interface for ?LANGB (Reference-LAPACK PR725)

Author: martin-frbg

lapack-netlib/LAPACKE/src/lapacke_zlangb_work.c

@@ -0,0 +1,84 @@
+/*****************************************************************************
+  Copyright (c) 2022, Intel Corp.
+  All rights reserved.
+
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+  modification, are permitted provided that the following conditions are met:
+
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+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
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+    * Neither the name of Intel Corporation nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+  THE POSSIBILITY OF SUCH DAMAGE.
+*****************************************************************************
+* Contents: Native middle-level C interface to LAPACK function zlangb
+* Author: Simon Märtens
+*****************************************************************************/
+
+#include "lapacke_utils.h"
+
+double LAPACKE_zlangb_work( int matrix_layout, char norm, lapack_int n,
+                            lapack_int kl, lapack_int ku,
+                            const lapack_complex_double* ab, lapack_int ldab,
+                            double* work )
+{
+    lapack_int info = 0;
+    double res = 0.;
+    if( matrix_layout == LAPACK_COL_MAJOR ) {
+        /* Call LAPACK function and adjust info */
+        res = LAPACK_zlangb( &norm, &n, &kl, &ku, ab, &ldab, work );
+    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
+        char norm_lapack;
+        double* work_lapack = NULL;
+        /* Check leading dimension(s) */
+        if( ldab < kl+ku+1 ) {
+            info = -7;
+            LAPACKE_xerbla( "LAPACKE_zlangb_work", info );
+            return info;
+        }
+        if( LAPACKE_lsame( norm, '1' ) || LAPACKE_lsame( norm, 'o' ) ) {
+            norm_lapack = 'i';
+        } else if( LAPACKE_lsame( norm, 'i' ) ) {
+            norm_lapack = '1';
+        } else {
+            norm_lapack = norm;
+        }
+        /* Allocate memory for work array(s) */
+        if( LAPACKE_lsame( norm_lapack, 'i' ) ) {
+            work_lapack = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,n) );
+            if( work_lapack == NULL ) {
+                info = LAPACK_WORK_MEMORY_ERROR;
+                goto exit_level_0;
+            }
+        }
+        /* Call LAPACK function */
+        res = LAPACK_zlangb( &norm, &n, &ku, &kl, ab, &ldab, work );
+        /* Release memory and exit */
+        if( work_lapack ) {
+            LAPACKE_free( work_lapack );
+        }
+exit_level_0:
+        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
+            LAPACKE_xerbla( "LAPACKE_zlangb_work", info );
+        }
+    } else {
+        info = -1;
+        LAPACKE_xerbla( "LAPACKE_zlangb_work", info );
+    }
+    return res;
+}