Function XMMLoad4Values

alg/gdalwarpkernel.cpp:3351–3365

/************************************************************************/

static CPL_INLINE __m128 XMMLoad4Values(const GByte *ptr)
{
    unsigned int i;
    memcpy(&i, ptr, 4);
    __m128i xmm_i = _mm_cvtsi32_si128(i);
    // Zero extend 4 packed unsigned 8-bit integers in a to packed
    // 32-bit integers.
#if defined(__SSE4_1__) || defined(__AVX__) || defined(USE_NEON_OPTIMIZATIONS)
    xmm_i = _mm_cvtepu8_epi32(xmm_i);
#else
    xmm_i = _mm_unpacklo_epi8(xmm_i, _mm_setzero_si128());
    xmm_i = _mm_unpacklo_epi16(xmm_i, _mm_setzero_si128());
#endif
    return _mm_cvtepi32_ps(xmm_i);
}

static CPL_INLINE __m128 XMMLoad4Values(const GUInt16 *ptr)
{