matrixMul_gold.cpp

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////////////////////////////////////////////////////////////////////////////////
// export C interface
extern "C"
void computeGold(float *, const float *, const float *, unsigned int, unsigned int, unsigned int);

////////////////////////////////////////////////////////////////////////////////
//! Compute reference data set
//! C = A * B
//! @param C          reference data, computed but preallocated
//! @param A          matrix A as provided to device
//! @param B          matrix B as provided to device
//! @param hA         height of matrix A
//! @param wB         width of matrix B
////////////////////////////////////////////////////////////////////////////////
void
computeGold(float *C, const float *A, const float *B, unsigned int hA, unsigned int wA, unsigned int wB)
{
    for (unsigned int i = 0; i < hA; ++i)
        for (unsigned int j = 0; j < wB; ++j)
        {
            double sum = 0;

            for (unsigned int k = 0; k < wA; ++k)
            {
                double a = A[i * wA + k];
                double b = B[k * wB + j];
                sum += a * b;
            }

            C[i * wB + j] = (float)sum;
        }
}