CUDA Note[5]="float";

//-----------------------------------------------------------------------------
__global__ void __FloatTest(unsigned int* pIn)
{
    unsigned int fMask = *pIn;

    float iMask =
        (float)((fMask & 0xff000000) >> 24) * 0.1122f +
        (float)((fMask & 0x00ff0000) >> 16) * 0.2233f +
        (float)((fMask & 0x0000ff00) >>  8) * 0.3344f +
        (float)((fMask & 0x000000ff) >>  0) * 0.4455f;

    *((float*)pIn) = iMask;
}

//-----------------------------------------------------------------------------
void FloatTest()
{
    const unsigned int fMask = 0x22446688;

    float  iMask = 0.0f;
    float* pMask = 0;

    ::cudaMalloc(&pMask, sizeof(float));

    ::cudaMemcpy(pMask, &fMask, sizeof(unsigned int), cudaMemcpyHostToDevice);

    __FloatTest<<<1, 1>>>((unsigned int*)pMask);

    ::cudaMemcpy(&iMask, pMask, sizeof(float), cudaMemcpyDeviceToHost);

    ::cudaFree(pMask);

    ::printf("gpu : %f\n", iMask);

    iMask =
        (float)((fMask & 0xff000000) >> 24) * 0.1122f +
        (float)((fMask & 0x00ff0000) >> 16) * 0.2233f +
        (float)((fMask & 0x0000ff00) >>  8) * 0.3344f +
        (float)((fMask & 0x000000ff) >>  0) * 0.4455f;

    ::printf("cpu : %f\n", iMask);
}

output :
gpu : 113.695999
cpu : 113.695999

//-----------------------------------------------------------------------------
__global__ void __FloatTest(unsigned int* pIn)
{
    unsigned int fMask = *pIn;

    float iMask =
        (float)((fMask & 0xff000000) >> 24) * 0.112233f +
        (float)((fMask & 0x00ff0000) >> 16) * 0.223344f +
        (float)((fMask & 0x0000ff00) >>  8) * 0.334455f +
        (float)((fMask & 0x000000ff) >>  0) * 0.445566f;

    *((float*)pIn) = iMask;
}

//-----------------------------------------------------------------------------
void FloatTest()
{
    const unsigned int fMask = 0x22446688;

    float  iMask = 0.0f;
    float* pMask = 0;

    ::cudaMalloc(&pMask, sizeof(float));

    ::cudaMemcpy(pMask, &fMask, sizeof(unsigned int), cudaMemcpyHostToDevice);

    __FloatTest<<<1, 1>>>((unsigned int*)pMask);

    ::cudaMemcpy(&iMask, pMask, sizeof(float), cudaMemcpyDeviceToHost);

    ::cudaFree(pMask);

    ::printf("gpu : %f\n", iMask);

    iMask =
        (float)((fMask & 0xff000000) >> 24) * 0.112233f +
        (float)((fMask & 0x00ff0000) >> 16) * 0.223344f +
        (float)((fMask & 0x0000ff00) >>  8) * 0.334455f +
        (float)((fMask & 0x000000ff) >>  0) * 0.445566f;

    ::printf("cpu : %f\n", iMask);
}

output :
gpu : 113.714699
cpu : 113.714706

so keep in mind that the float result may different between cpu & gpu.