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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T03:49:40+00:00 2026-05-15T03:49:40+00:00

What are these data types for? __m64, __m128, __m256 ?

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What are these data types for? __m64, __m128,
__m256 ?

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  1. Editorial Team
    Editorial Team
    2026-05-15T03:49:41+00:00Added an answer on May 15, 2026 at 3:49 am

    A quick google-search gives me:

    • The __m64 data type is for use with the MMX and 3DNow! intrinsics
    • The __m128 data type, for use with the Streaming SIMD Extensions and Streaming SIMD Extensions 2 instructions intrinsics

    Unfortunately I can’t readily find what __m256 is but I suspect it is along the same lines.

    Basically, data structures for MMX and similar technologies.

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