[all-commits] [llvm/llvm-project] 5b5d3f: [AArch64][GlobalISel] Fold G_SELECT cc, %t, (G_ADD...

[Jessica Paquette via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5b5d3fa9d9cf9e0b8904de0dc9ea5248f6a37ed1
      https://github.com/llvm/llvm-project/commit/5b5d3fa9d9cf9e0b8904de0dc9ea5248f6a37ed1
  Author: Jessica Paquette <jpaquette at apple.com>
  Date:   2020-12-08 (Tue, 08 Dec 2020)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/select-select.mir

  Log Message:
  -----------
  [AArch64][GlobalISel] Fold G_SELECT cc, %t, (G_ADD %x, 1) -> CSINC %t, %x, cc

This implements

```
G_SELECT cc, %true, (G_ADD %x, 1) -> CSINC %true, %x, cc
G_SELECT cc, (G_ADD %x, 1), %false -> CSINC %x, %false, inv_cc
```

Godbolt example: https://godbolt.org/z/eoPqKq

Differential Revision: https://reviews.llvm.org/D92868