#elif SIMDPP_USE_SSE2
    switch (id) {
    case 0: return _mm_cvtss_f32(a.native());
#if SIMDPP_USE_SSE3
    case 1: return _mm_cvtss_f32(_mm_movehdup_ps(a.native()));
#else
    case 1: return _mm_cvtss_f32(_mm_shuffle_ps(a.native(), a.native(), _MM_SHUFFLE(id, id, id, id)));
#endif
    case 2: return _mm_cvtss_f32(_mm_unpackhi_ps(a.native(), a.native()));
    case 3: return _mm_cvtss_f32(_mm_shuffle_ps(a.native(), a.native(), _MM_SHUFFLE(id, id, id, id)));
    }

Error	C4715	'simdpp::arch_sse4p1::detail::insn::i_extract<0>': not all control paths return a value	C:\Users\[...]\libsimdpp\simdpp\detail\insn\extract.h	369		

#elif SIMDPP_USE_SSE2
    switch (id) {
    default:
    case 0: return _mm_cvtss_f32(a.native());
#if SIMDPP_USE_SSE3