Can I store only 96 bit of 128 with SSE instructions?

Question

_mm_store_ps stores (for example) 128 bit in a 4 float elements of an array.

Can I store only 96 bit? or rather, only first 3 byte in 3 elements of array? (with SSE instuctions)

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I explained myself badly: I do not want to mask the bits. I would like to store only the first 3 bytes, without copying the remaining 32 bits. Without overwriting beyond the memory

Answer 1

You can do it with _mm_maskmoveu_si128 (SSE2) or _mm_maskstore_ps (AVX). However, you shouldn't expect good performance from these instructions.