Am 03.02.19 um 21:52 schrieb J. Gareth Moreton:
It just seems highly dependent on the source code and can easily break if it's changed... and not just the Floor function, but also possibly if Trunc and Frac are modified in some way. The code does boil down to two instructions in SSE 4.1 and AVX, but it depends on many different nodes with an exact arrangement, and if something is changed (but still functionally equivalent), the optimisation will break.
Well, yes. But maybe its possible to create a reasonable test and take care of most imaginable situations.
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