[all-commits] [llvm/llvm-project] 5c63b2: [GlobalISel] Add a m_SpecificReg matcher

[Jessica Paquette via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5c63b24ec8fde29023af1213a4685df1d4a58dde
      https://github.com/llvm/llvm-project/commit/5c63b24ec8fde29023af1213a4685df1d4a58dde
  Author: Jessica Paquette <jpaquette at apple.com>
  Date:   2022-10-06 (Thu, 06 Oct 2022)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/MIPatternMatch.h
    M llvm/unittests/CodeGen/GlobalISel/PatternMatchTest.cpp

  Log Message:
  -----------
  [GlobalISel] Add a m_SpecificReg matcher

Similar to the specific matchers for constants.

The intention here is to make it easier to write combines which check if a
specific register is used more than once.

e.g. matching patterns like:

```
(X + Y) == Y
```

Differential Revision: https://reviews.llvm.org/D135378