[all-commits] [llvm/llvm-project] fb7c23: [SimpleLoopUnswitch] Skip trivial select conds for...

[Joshua Cao via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fb7c237ca0dbc6f85c532f73e60616d0e7db82df
      https://github.com/llvm/llvm-project/commit/fb7c237ca0dbc6f85c532f73e60616d0e7db82df
  Author: Joshua Cao <cao.joshua at yahoo.com>
  Date:   2023-05-15 (Mon, 15 May 2023)

  Changed paths:
    M llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
    M llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-select.ll

  Log Message:
  -----------
  [SimpleLoopUnswitch] Skip trivial select conds for selects

Fixes https://github.com/llvm/llvm-project/issues/62715

If a select's condition is a trivial select:
```
%s = select %cond, i1 true, i1 false
```
Unswitch on %cond, rather than %s. This fixes crashes where there is a
disparity in finding candidates and and the transformation logic.