CODEWITHSUNDEEP
x86intrinsicsavxavx2sse4
ADMS
ADMS

Reputation: 108

Does AVX or AVX2 support 256 bit string instructions and mullo for unsigned short?

I researched about string instructions that is supported in AVX or AVX2 ISA but I can not find any 256 bit string comparison instruction like SSE4.2 If there is any string comparison that I can not find where can I find them? Otherwise Why AVX/AVX2 ISA does not support 256 bit string instructions? I also find out that AVX2 does not support mullo for unsigned short as a 16bit unsigned integer and I don't know the reason. Because it has been supported in SSE4.2.

Upvotes: 2

Views: 1426

Answers (1)

Paul R
Paul R

Reputation: 213060

256 bit string compare instructions - no, there are none in AVX/AVX2 (or AVX-512 for that matter) - just the 128 bit instructions in SSE 4.2.

mullo for unsigned short - this is not needed, since the result would be the same as with a signed short mullo. It's only the nulhi instruction that needs to exist in signed and unsigned variants.

Upvotes: 3

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