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Roberto_O_
Beginner
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simple question about avx instructions.

i want to know if avx instructions use only one thread or if they are multithreaded?

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TimP
Black Belt
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No different from any other instruction; threading is outside instruction level and each thread can execute instructions.

Not knowing what you're getting at, it's entirely possible that multiple threads on a single core may be slower with AVX-256 than with 128-bit wide instructions, or compared with a single thread of AVX-256, due to cache performance issues.

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