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Asked: 2026-05-10T16:40:13+00:00

Short version: I’m wondering if it’s possible, and how best, to utilise CPU specific

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Short version: I’m wondering if it’s possible, and how best, to utilise CPU specific instructions within a DLL?

Slightly longer version: When downloading (32bit) DLLs from, say, Microsoft it seems that one size fits all processors.

Does this mean that they are strictly built for the lowest common denominator (ie. the minimum platform supported by the OS)? Or is there some technique that is used to export a single interface within the DLL but utilise CPU specific code behind the scenes to get optimal performance? And if so, how is it done?

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  1. I don’t know of any standard technique but if I had to make such a thing, I would write some code in the DllMain() function to detect the CPU type and populate a jump table with function pointers to CPU-optimized versions of each function.

    There would also need to be a lowest common denominator function for when the CPU type is unknown.

    You can find current CPU info in the registry here:

    HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor
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