/******************************************************************************
 * $Id: testperfcopywords.cpp 7e07230bbff24eb333608de4dbd460b7312839d0 2017-12-11 19:08:47Z Even Rouault $
 *
 * Project:  GDAL Core
 * Purpose:  Test performance of GDALCopyWords().
 * Author:   Even Rouault, <even dot rouault at mines dash paris dot org>
 *
 ******************************************************************************
 * Copyright (c) 2009-2010, Even Rouault <even dot rouault at mines-paris dot org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "gdal.h"
#include "cpl_conv.h"

#include <cstdio>
#include <cstdlib>
#include <ctime>

int main(int /* argc */, char* /* argv */ [])
{
    void* in = calloc(1, 256 * 256 * 16);
    void* out = malloc(256 * 256 * 16);

    int i;
    int intype, outtype;

    clock_t start, end;

    for(intype=GDT_Byte; intype<=GDT_CFloat64;intype++)
    {
        for(outtype=GDT_Byte;outtype<=GDT_CFloat64;outtype++)
        {
            start = clock();

            for(i=0;i<1000;i++)
                GDALCopyWords(in, (GDALDataType)intype, 16, out, (GDALDataType)outtype, 16, 256 * 256);

            end = clock();

            printf("%s -> %s : %.2f s\n",
                   GDALGetDataTypeName((GDALDataType)intype),
                   GDALGetDataTypeName((GDALDataType)outtype),
                   (end - start) * 1.0 / CLOCKS_PER_SEC);

            start = clock();

            for(i=0;i<1000;i++)
                GDALCopyWords(in,
                              (GDALDataType)intype,
                              GDALGetDataTypeSize((GDALDataType)intype) / 8,
                              out,
                              (GDALDataType)outtype,
                              GDALGetDataTypeSize((GDALDataType)outtype) / 8,
                              256 * 256);

            end = clock();

            printf("%s -> %s (packed) : %.2f s\n",
                   GDALGetDataTypeName((GDALDataType)intype),
                   GDALGetDataTypeName((GDALDataType)outtype),
                   (end - start) * 1.0 / CLOCKS_PER_SEC);
        }
    }

    for(int k=0;k<2;k++)
    {
        if( k == 1 )
        {
            printf("Disabling SSSE3\n");
            CPLSetConfigOption("GDAL_USE_SSSE3", "NO");
        }

        // 2 byte stride --> packed byte
        start = clock();
        for(i=0;i<100000;i++)
            GDALCopyWords(in, GDT_Byte, 2, out, GDT_Byte, 1, 256 * 256);
        end = clock();
        printf("2-byte stride Byte ->packed Byte : %.2f\n",
                (end - start) * 1.0 / CLOCKS_PER_SEC);

        // 3 byte stride --> packed byte
        start = clock();
        for(i=0;i<100000;i++)
            GDALCopyWords(in, GDT_Byte, 3, out, GDT_Byte, 1, 256 * 256);
        end = clock();
        printf("3-byte stride Byte ->packed Byte : %.2f\n",
                (end - start) * 1.0 / CLOCKS_PER_SEC);

        // 4 byte stride --> packed byte
        start = clock();
        for(i=0;i<100000;i++)
            GDALCopyWords(in, GDT_Byte, 4, out, GDT_Byte, 1, 256 * 256);
        end = clock();
        printf("4-byte stride Byte ->packed Byte : %.2f\n",
                (end - start) * 1.0 / CLOCKS_PER_SEC);
    }
    CPLSetConfigOption("GDAL_USE_SSSE3", nullptr);

    return 0;
}
