/*

File:  Test.c

Abstract:

    This is a simple test program for the vAdd routine.  It is not needed to

    understand the lessons of the WWDC session.  This is not a robust test

    program; it is only intend for assistance with the sample code.

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*/

#include <stdio.h>

#include <stdlib.h>

#include "vAdd.h"

#define ElementsPerVector   4

// Add padding before and after array to check for improper modifications.

#define Padding 4

// This routine generates expected results.

void Reference(const float *A, const float *B, float *C, long N)

{

    for (long i = 0; i < N; ++i)

        C[i] = A[i] + B[i];

}

int main(void)

{

    // Define test data.

    static const int MaximumN = 1024;

    int AllocationLength = MaximumN + ElementsPerVector - 1;

    /*  Allocate space for arrays.  Include extra space so we can perform

        experiments with different address offsets.

    */

    float *A  = malloc(AllocationLength * sizeof *A );

    float *B  = malloc(AllocationLength * sizeof *B );

    float *C0 = malloc(MaximumN * sizeof *C0);

    float *mC = malloc((AllocationLength + 2*Padding) * sizeof *mC);

    if (!A || !B || !C0 || !mC)

    {

        free(mC);

        free(C0 );

        free(B  );

        free(A  );

        fprintf(stderr, "Error, failed to allocate memory.\n");

        return EXIT_FAILURE;

    }

    float *C  = mC + Padding;

    // Initialize input arrays.

    for (long i = 0; i < AllocationLength; ++i)

    {

        A[i] = i + 1;

        B[i] = 10000 * (i+1);

    }

    // Test different lengths.

    for (long N = 0; N <= MaximumN; ++N)

    // Try combinations of address offsets modulo vector size.

    for (long AOffset = 0; AOffset < ElementsPerVector; ++AOffset)

    for (long BOffset = 0; BOffset < ElementsPerVector; ++BOffset)

    for (long COffset = 0; COffset < ElementsPerVector; ++COffset)

    {

        float *C1 = C + COffset;

        // Erase output.

        for (long i = -Padding; i < N + Padding; ++i)

            C1[i] = 0;

        // Get expected results.

        Reference(A + AOffset, B + BOffset, C0, N);

        // Get observed results.

        vAdd(A + AOffset, B + BOffset, C + COffset, N);

        // Look for errors in the expected output elements.

        for (long i = 0; i < N; ++i)

            if (C0[i] != C1[i])

            {

                fprintf(stderr,

"Error.\n"

"\tA = %p.  B = %p.  C = %p.  N = %zd.\n"

"\tElement %zd:  Expected %.7g, observed %.7g.\n",

                    (void *) A, (void *) B, (void *) C1, (size_t) N,

                    (size_t) i, C0[i], C1[i]);

                return EXIT_FAILURE;

            }

        // Look for errors outside the expected output elements.

        for (long i = -Padding; i < N + Padding; ++i)

            if (C1[i] != 0 && (i < 0 || N <= i))

            {

                fprintf(stderr,

"Error.\n"

"\tA = %p.  B = %p.  C = %p.  N = %zd.\n"

"\tExternal element %zd was modified:  Expected 0, observed %.7g.\n",

                    (void *) A, (void *) B, (void *) C1, (size_t) N,

                    (size_t) i, C1[i]);

                return EXIT_FAILURE;

            }

    }

    free(mC);

    free(C0);

    free(B );

    free(A );

    return 0;

}