[llvm] [Analysis] Avoid repeated hash lookups (NFC) (PR #131421)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/131421.diff


1 Files Affected:

- (modified) llvm/lib/Analysis/LoopAccessAnalysis.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/Analysis/LoopAccessAnalysis.cpp b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
index 38ee82b77a946..57a76bc7a81e5 100644
--- a/llvm/lib/Analysis/LoopAccessAnalysis.cpp
+++ b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
@@ -2287,8 +2287,9 @@ bool MemoryDepChecker::areDepsSafe(const DepCandidates &AccessSets,
           (AIIsWrite ? AI : std::next(AI));
       while (OI != AE) {
         // Check every accessing instruction pair in program order.
-        for (std::vector<unsigned>::iterator I1 = Accesses[*AI].begin(),
-             I1E = Accesses[*AI].end(); I1 != I1E; ++I1)
+        auto &Acc = Accesses[*AI];
+        for (std::vector<unsigned>::iterator I1 = Acc.begin(), I1E = Acc.end();
+             I1 != I1E; ++I1)
           // Scan all accesses of another equivalence class, but only the next
           // accesses of the same equivalent class.
           for (std::vector<unsigned>::iterator

``````````

</details>


https://github.com/llvm/llvm-project/pull/131421