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Blitsort can sort strings, but something like a 12 byte data structure would require an array with pointer references to sort.

As for the degradation against std:stable_sort:

5% slower at 1 million, 10% slower at 10 million, 20% slower at 100 million.

With sqrt n auxiliary you're looking at 2%, 4%, 6% slower.

Against qsort() it remains faster at 10 million, 3% slower at 100 million.

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I am thinking more about sorting, say, 20-byte or 24-byte custom structs. Directly sorting arrays is probably faster than sorting pointers to arrays. At least in my applications, I rarely just sort numbers; I more often sort numbers along with other data associated with the numbers.

Hard to say which would be faster, I've made a mental note to benchmark sorting 16 byte long doubles through pointers as well as directly.

I never tried, but it should be possible (and relatively easy) to add custom sizes in the .h file.

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