CODEWITHSUNDEEP
c++comparisonsimd
user1461001
user1461001

Reputation: 703

Non-Homogenous Comparison using SIMD

Is it possible to do non-homegenous (two datatypes which are not the same) comparison using SIMD instructions (intrinsics) , specifically in SSE2 uptil SSE4.x instruction set? . i.e. float and double? or 32bit and 64 bit integers? even a float with an integer etc?

Upvotes: 1

Views: 87

Answers (1)

Mats Petersson
Mats Petersson

Reputation: 129524

You mean you have, say, an array of integer and you want to compare it with the values in an array of doubles? You will unfortunately have to perform some sort of conversion to achieve that. There are a group of cvtXX2YY instructions that do that, and they should be available in the intrinsic functions. You just have to pick out the one that does the right conversion, e.g. _mm_cvtpi32_ps - as can be seen in this example, you can't convert four integers to four floats... Just two at a time. Don't ask me why...

If you are asking about "Can you convert one integer and one float at with another integer and float", then no, that's not available.

Upvotes: 2

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