Enhance Approx class

[vhirtham]

• [x] move implementation to approx.inl
• [x] Add support for SSE
• [x] Replace normal approx with SSE version in SSE matrix classes - Be aware use >= or <= if necessary since < or > might fail at the last register if rows % numRegisterentries !=0. Reason: All unused registers should be 0. Unused elements should never contribute to the comparison
• [x] MAYBE add static functions to set default parameters Postponed. Not necessary at the moment
• [x] Add exceptions in ctor of InsideTolerance class and test them (Didn't want to start a new issue)

Bitmasks for register abs can be used similar to this approach.

Example code for SSE comparison:

    __m128 a = _mm_set_ps(1.f, 2.f, 3.f, 4.f);
    __m128 b = _mm_set_ps(1.f, 2.f, 3.f, 4.f);
    __m128i res = reinterpret_cast<__m128i>(_mm_cmpeq_ps(a, b));
    for (U32 i = 0; i < 4; ++i)
        std::cout << "element " << i << " equal: " << res[i] << std::endl;

    U16 mask = _mm_movemask_epi8(res);
    std::cout << "mask: " << mask << std::endl;
    if (mask == 0xffff)
        std::cout << "All values equal" << std::endl;
    else if (mask != 0)
        std::cout << "Some values equal" << std::endl;
    else
        std::cout << "No values equal" << std::endl;

    std::cout << std::endl << std::endl << "Test fot  __m256 " << std::endl;
    __m256 c = _mm256_set_ps(1., 2., 3., 4., 5., 6., 7., 8.);
    __m256 d = _mm256_set_ps(1., 2., 3., 4., 5., 6., 7., 8.);
    __m256i res256 = reinterpret_cast<__m256i>(_mm256_cmp_ps(c, d, _CMP_EQ_OS));
    for (U32 i = 0; i < 8; ++i)
        std::cout << "element " << i << " equal: " << res256[i] << std::endl;

    U32 mask256 = _mm256_movemask_epi8(res256);
    std::cout << "mask: " << mask256 << std::endl;
    if (mask256 == 0xffffffff)
        std::cout << "All values equal" << std::endl;
    else if (mask256 != 0)
        std::cout << "Some values equal" << std::endl;
    else
        std::cout << "No values equal" << std::endl;

source: https://stackoverflow.com/questions/6042399/how-to-compare-m128-types

[vhirtham]

Finished with commit 00c8b19a88996275a6b30d8310520939924afdda