[llvm] [IndVarSimplify] Allow predicateLoopExit on some loops with thread-local writes (PR #155901)

[via llvm-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
index a2b2331c0..ceb1acdb7 100644
--- a/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/llvm/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -1852,8 +1852,9 @@ bool IndVarSimplify::predicateLoopExits(Loop *L, SCEVExpander &Rewriter) {
         HasThreadLocalSideEffects = true;
         if (StoreInst *SI = dyn_cast<StoreInst>(&I)) {
           // Simple stores cannot be observed by other threads.
-          // If HasThreadLocalSideEffects is set, we check crashingBBWithoutEffect
-          // to make sure that the crashing BB cannot observe them either.
+          // If HasThreadLocalSideEffects is set, we check
+          // crashingBBWithoutEffect to make sure that the crashing BB cannot
+          // observe them either.
           if (!SI->isSimple())
             return false;
         } else {

``````````

</details>


https://github.com/llvm/llvm-project/pull/155901