Arjun P cdbc5f1e10 [MLIR][Presburger] introduce MPInt to support fast arbitrary precision in Presburger ...

This uses an int64_t-based fastpath for the common case and falls back to
SlowMPInt to handle the rare cases where larger numbers occur.
It uses `__builtin_*` for performance through the support in LLVM MathExtras.

Using this in the Presburger library results in a minor performance
*improvement* over any commit hash before sequence of patches
starting at d5e31cf38a.

This was previously reverted in 1e10d35ea9 due
to a build failure; relanding now with an attempted fix.

Reviewed By: Groverkss, ftynse

Differential Revision: https://reviews.llvm.org/D128811

2022-07-11 15:46:44 +01:00

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