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Author SHA1 Message Date
Martin Hořeňovský
d99eb8bec8 Optimize 64x64 extended multiplication implementation 
Now we use intrinsics when possible, and fallback to optimized
implementation in portable C++. The difference is about 4x when
we can use intrinsics and about 2x when we cannot.

This should speed up our Lemire's algorithm implementation nicely.
 2024-04-03 13:28:25 +02:00
Martin Hořeňovský
04a829b0e1 Add helpers for implementing uniform integer distribution 
* Utility for extended mult n x n bits -> 2n bits
* Utility to adapt output from URBG to target (unsigned) integral
  type
* Utility to reorder signed values into unsigned type while keeping
  the order.
 2023-12-10 19:53:36 +01:00