clapack在android上移植

参考

https://www.cnblogs.com/hrlnw/p/4128217.html

1.从https://github.com/simonlynen/android_libs这个网址下载代码。

如何在android上进行android库编译

https://blog.csdn.net/h3c4lenovo/article/details/10364679

1 设置ndk环境
export ANDROID_NDK_HOME=/DATA/Android/Ndk/android-ndk-r13b
export PATH=$PATH:$ANDROID_NDK_HOME
#ANDROID_NDK_HOME=/DATA/share/software/android-ndk-r16

2 make 与gcc确保无问题
make -v
gcc -v

3 写好jni文件

4 编译ndk-build

5 android工程调用

#如果同时编译32和64未版本，或会导致32位的库打包到64位中，需要单独编译，
#./obj/local/arm64-v8a/libtestlapack.so: error adding symbols: File in wrong format

导致32位的库打包到64位中，
[arm64-v8a] Prebuilt : libtestlapack.so <= jni/lapack/lib/armeabi-v7a/
[arm64-v8a] Install : libtestlapack.so => libs/arm64-v8a/libtestlapack.so
[arm64-v8a] Compile++ : mtcnn_facedetect <= similaritytrans.cpp

#include <stdio.h>
#include <string.h>
#include <jni.h>
#include <complex>
#include <sstream>
#include <string>
#include <android/log.h>
#define TAG "log"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,TAG ,__VA_ARGS__)


// #ifndef JNIEXPORT
// #define JNIEXPORT
// #endif

// #ifndef JNICALL
// #define JNICALL
// #endif

static long dgesvd(char *jobu, char *jobvt, long *m, long *n, 
    double *a, long *lda, double *s, double *u, long *
    ldu, double *vt, long *ldvt, double *work, long *lwork)
{
    // int dgesvd_(char *jobu, char *jobvt, integer *m, integer *n, 
    // doublereal *a, integer *lda, doublereal *s, doublereal *u, integer *
    // ldu, doublereal *vt, integer *ldvt, doublereal *work, integer *lwork, 
    // integer *info)

    extern int dgesvd_(char *jobu, char *jobvt, long *m, long *n, 
    double *a, long *lda, double *s, double *u, long *
    ldu, double *vt, long *ldvt, double *work, long *lwork, 
    long *info);

    long info;
    dgesvd_("A", "A", m, n, a, lda, s, u, ldu, vt, ldvt, work, lwork, &info);
    return info;
}


#define mymax(a,b) (a) > (b) ? (a) : (b)
#define mymin(a,b) (a) < (b) ? (a) : (b)


void transposeMatrix(double *A, int row, int col)
{
    for(int i =0; i < row; ++i)
    {
        for (int j = i; j < col; ++j)
        {
            double temp = A[i * col + j];
            A[i * col + j] = A[j * col + i];
            A[j *col + i] = temp;
        }
    }
}

int GetLapackSVD(double *a, double *u, double *s, double *vt)
{
   //double a[2*2] = {4 , 4 , -3 ,  3};
   //这个函数，这里要特别注意储存方式（column major）！！
   transposeMatrix(a,2,2);
   long m,n;
   long lda,ldu,ldvt,lwork;
   m = 2;
   n = 2;
   lda = 2;
   ldu = 2;
   ldvt = 2;
   //https://blog.csdn.net/versuna/article/details/8246377
   lwork = 10;//mymax(3*mymin(m, n)+mymax(m, n), 5*mymin(m,n));
   LOGD("#lwork = %d", lwork);
   double work[1*lwork];
   char jobu = 'A';
   char jobvt = 'A';
   dgesvd(&jobu, &jobvt, &m, &n, a, &lda, s, u, &ldu, vt, &ldvt, work, &lwork);
   return 0;
}

int main()
{
    double a[4];
    double u[4];
    double s[2];
    double vt[4];
}

在贴一段内部代码

/*****************************************************************************
   Copyright (c) 2014, Intel Corp.
   All rights reserved.
 
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
 
     * Redistributions of source code must retain the above copyright notice,
       this list of conditions and the following disclaimer.
     * Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
     * 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 high-level C interface to LAPACK function dgesdd
 * Author: Intel Corporation
 * Generated November 2015
 *****************************************************************************/
 
 #include "lapacke_utils.h"
 
 lapack_int LAPACKE_dgesdd( int matrix_layout, char jobz, lapack_int m,
                            lapack_int n, double* a, lapack_int lda, double* s,
                            double* u, lapack_int ldu, double* vt,
                            lapack_int ldvt )
 {
     lapack_int info = 0;
     lapack_int lwork = -1;
     lapack_int* iwork = NULL;
     double* work = NULL;
     double work_query;
     if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
         LAPACKE_xerbla( "LAPACKE_dgesdd", -1 );
         return -1;
     }
 #ifndef LAPACK_DISABLE_NAN_CHECK
     if( LAPACKE_get_nancheck() ) {
         /* Optionally check input matrices for NaNs */
         if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
             return -5;
         }
     }
 #endif
     /* Allocate memory for working array(s) */
     iwork = (lapack_int*)
         LAPACKE_malloc( sizeof(lapack_int) * MAX(1,8*MIN(m,n)) );
     if( iwork == NULL ) {
         info = LAPACK_WORK_MEMORY_ERROR;
         goto exit_level_0;
     }
     /* Query optimal working array(s) size */
     info = LAPACKE_dgesdd_work( matrix_layout, jobz, m, n, a, lda, s, u, ldu, vt,
                                 ldvt, &work_query, lwork, iwork );
     if( info != 0 ) {
         goto exit_level_1;
     }
     lwork = (lapack_int)work_query;
     /* Allocate memory for work arrays */
     work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
     if( work == NULL ) {
         info = LAPACK_WORK_MEMORY_ERROR;
         goto exit_level_1;
     }
     /* Call middle-level interface */
     info = LAPACKE_dgesdd_work( matrix_layout, jobz, m, n, a, lda, s, u, ldu, vt,
                                 ldvt, work, lwork, iwork );
     /* Release memory and exit */
     LAPACKE_free( work );
 exit_level_1:
     LAPACKE_free( iwork );
 exit_level_0:
     if( info == LAPACK_WORK_MEMORY_ERROR ) {
         LAPACKE_xerbla( "LAPACKE_dgesdd", info );
     }
     return info;
 }