[all-commits] [llvm/llvm-project] fcc223: [SCEV] Add missing cache queries

[Ehud Katz via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: fcc2238b8bfb9498b46a48d219193de8c00a25a0
      https://github.com/llvm/llvm-project/commit/fcc2238b8bfb9498b46a48d219193de8c00a25a0
  Author: Ehud Katz <ehudkatz at gmail.com>
  Date:   2020-03-13 (Fri, 13 Mar 2020)

  Changed paths:
    M llvm/include/llvm/Analysis/ScalarEvolution.h
    M llvm/lib/Analysis/ScalarEvolution.cpp

  Log Message:
  -----------
  [SCEV] Add missing cache queries

Calculating SCEVs can be cumbersome, and may take very long time (even
hours, for very long expressions). To prevent recalculating expressions
over and over again, we cache them.
This change add cache queries to key positions, to prevent recalculation
of the expressions.

Fix PR43571.

Differential Revision: https://reviews.llvm.org/D70097