Commits on Mar 14, 2020

1. Convert drfti1 to a safe version …

   I am still not satisfied with this, but at least it can be a decent
   starting point for improvements. My points are:
   1. Variable names are still unintelligible, mainly because I do not have
   a clear vision of the algorithm. Maybe someone better than me can be
   able to grasp the meaning of each variable and to git them a decent
   name.
   2. The first loop is still unidiomatic. Everything I thought involves an
   additional check to exit the outer loop, and at the current state (no
   benchmarks) I am not sure about the best approch.
   
   Nevertheless, cast checks that were not present in the original code
   should be helpful to find strange edge cases, and they should have a
   negligible cost due to the cpu branch predictor.

   

   dodomorandi committed Mar 14, 2020
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