[all-commits] [llvm/llvm-project] c9e52f: [ADT] Add all_equal predicate

[Jakub Kuderski via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c9e52fbe4d4fa37a87b2855ad7e118dcdee2db68
      https://github.com/llvm/llvm-project/commit/c9e52fbe4d4fa37a87b2855ad7e118dcdee2db68
  Author: Jakub Kuderski <kubak at google.com>
  Date:   2022-08-22 (Mon, 22 Aug 2022)

  Changed paths:
    M llvm/include/llvm/ADT/STLExtras.h
    M llvm/unittests/ADT/STLExtrasTest.cpp

  Log Message:
  -----------
  [ADT] Add all_equal predicate

`llvm::all_equal` checks if all values in the given range are equal, i.e., there are no two elements that are not equal.
Similar to `llvm::all_of`, it returns `true` when the range is empty.

`llvm::all_equal` is intended to supersede `llvm::is_splat`, which will be deprecated and removed in future patches.
See the discussion thread for more details:
https://discourse.llvm.org/t/adt-is-splat-and-empty-ranges/64692.

Reviewed By: dblaikie, shchenz

Differential Revision: https://reviews.llvm.org/D132334