[llvm] [Scalar] Avoid repeated hash lookups (NFC) (PR #132660)

[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/132660.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp (+6-6) 


``````````diff
diff --git a/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp b/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
index 38b7984d13606..0593c671826e2 100644
--- a/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
+++ b/llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
@@ -3296,12 +3296,12 @@ static void computeLiveInValues(DominatorTree &DT, Function &F,
       assert(!Data.LiveSet[&BB].count(Kill) && "live set contains kill");
 #endif
 
-    Data.LiveOut[&BB] = SetVector<Value *>();
-    computeLiveOutSeed(&BB, Data.LiveOut[&BB], GC);
-    Data.LiveIn[&BB] = Data.LiveSet[&BB];
-    Data.LiveIn[&BB].set_union(Data.LiveOut[&BB]);
-    Data.LiveIn[&BB].set_subtract(Data.KillSet[&BB]);
-    if (!Data.LiveIn[&BB].empty())
+    auto &Out = Data.LiveOut[&BB] = SetVector<Value *>();
+    computeLiveOutSeed(&BB, Out, GC);
+    auto &In = Data.LiveIn[&BB] = Data.LiveSet[&BB];
+    In.set_union(Out);
+    In.set_subtract(Data.KillSet[&BB]);
+    if (!In.empty())
       Worklist.insert_range(predecessors(&BB));
   }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/132660