[all-commits] [llvm/llvm-project] c23da6: [Attributor] Add support for compound assignment f...

[Shilei Tian via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c23da666b5be4da631c2ff8db4d129a90f319777
      https://github.com/llvm/llvm-project/commit/c23da666b5be4da631c2ff8db4d129a90f319777
  Author: Shilei Tian <tianshilei1992 at gmail.com>
  Date:   2021-07-15 (Thu, 15 Jul 2021)

  Changed paths:
    M llvm/include/llvm/Transforms/IPO/Attributor.h
    M llvm/lib/Transforms/IPO/Attributor.cpp
    M llvm/lib/Transforms/IPO/OpenMPOpt.cpp

  Log Message:
  -----------
  [Attributor] Add support for compound assignment for ChangeStatus

A common use of `ChangeStatus` is as follows:
```
ChangeStatus Changed = ChangeStatus::UNCHANGED;
Changed |= foo();
```
where `foo` returns `ChangeStatus` as well. Currently `ChangeStatus` doesn't
support compound assignment, we have to write as
```
Changed = Changed | foo();
```
which is not that convenient.

This patch add the support for compound assignment for `ChangeStatus`. Compound
assignment is usually implemented as a member function, and binary arithmetic
operator is therefore implemented using compound assignment. However, unlike
regular C++ class, enum class doesn't support member functions. As a result, they
can only be implemented in the way shown in the patch.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D106109