[llvm] LAA: add missed swap when inverting src, sink (NFC) (PR #122254)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: Ramkumar Ramachandra (artagnon)

<details>
<summary>Changes</summary>

We miss swapping the types of the source and sink when the source and sink are inverted, leaving a footgun behind. Fix this.

---
Full diff: https://github.com/llvm/llvm-project/pull/122254.diff


1 Files Affected:

- (modified) llvm/lib/Analysis/LoopAccessAnalysis.cpp (+1) 


``````````diff
diff --git a/llvm/lib/Analysis/LoopAccessAnalysis.cpp b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
index 2c75d5625cb66d..de0f81c0b6a4bf 100644
--- a/llvm/lib/Analysis/LoopAccessAnalysis.cpp
+++ b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
@@ -1921,6 +1921,7 @@ MemoryDepChecker::getDependenceDistanceStrideAndSize(
   if (StrideAPtr && *StrideAPtr < 0) {
     std::swap(Src, Sink);
     std::swap(AInst, BInst);
+    std::swap(ATy, BTy);
     std::swap(StrideAPtr, StrideBPtr);
   }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/122254