Doesn't seem to be for SSE & AVX at least (only 32-bit and 64-bit groups in AVX, and nothing for SSE). AVX-512 has _mm512_maskz_loadu_epi8, but not much has AVX

Doesn't seem to be for SSE & AVX at least (only 32-bit and 64-bit groups in AVX, and nothing for SSE). AVX-512 has _mm512_maskz_loadu_epi8, but not much has AVX-512. It's a shame that there aren't guarantees on being able to overread some number of garbage bytes. (for a SIMD-heavy project, I've just went with a custom allocator that guarantees the ability to read past the end of allocations, and storing by either maskstore for 32/64-bit, and blending with what's already there for 8/16-bit)