[llvm] [Scalar] Avoid repeated hash lookups (NFC) (PR #135585)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/135585.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp b/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
index 22d41be4edb90..f98a693804645 100644
--- a/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
+++ b/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
@@ -3287,8 +3287,9 @@ static void computeLiveInValues(DominatorTree &DT, Function &F,
   // Seed the liveness for each individual block
   for (BasicBlock &BB : F) {
     Data.KillSet[&BB] = computeKillSet(&BB, GC);
-    Data.LiveSet[&BB].clear();
-    computeLiveInValues(BB.rbegin(), BB.rend(), Data.LiveSet[&BB], GC);
+    auto &LiveSet = Data.LiveSet[&BB];
+    LiveSet.clear();
+    computeLiveInValues(BB.rbegin(), BB.rend(), LiveSet, GC);
 
 #ifndef NDEBUG
     for (Value *Kill : Data.KillSet[&BB])

``````````

</details>


https://github.com/llvm/llvm-project/pull/135585