[llvm] [Analysis] Avoid repeated hash lookups (NFC) (PR #123446)

[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/123446.diff


1 Files Affected:

- (modified) llvm/lib/Analysis/InlineCost.cpp (+4-2) 


``````````diff
diff --git a/llvm/lib/Analysis/InlineCost.cpp b/llvm/lib/Analysis/InlineCost.cpp
index 85287a39f2caad..c77441d5d46bbd 100644
--- a/llvm/lib/Analysis/InlineCost.cpp
+++ b/llvm/lib/Analysis/InlineCost.cpp
@@ -2698,8 +2698,10 @@ void CallAnalyzer::findDeadBlocks(BasicBlock *CurrBB, BasicBlock *NextBB) {
   auto IsEdgeDead = [&](BasicBlock *Pred, BasicBlock *Succ) {
     // A CFG edge is dead if the predecessor is dead or the predecessor has a
     // known successor which is not the one under exam.
-    return (DeadBlocks.count(Pred) ||
-            (KnownSuccessors[Pred] && KnownSuccessors[Pred] != Succ));
+    if (DeadBlocks.count(Pred))
+      return true;
+    auto *KnownSucc = KnownSuccessors[Pred];
+    return KnownSucc && KnownSucc != Succ;
   };
 
   auto IsNewlyDead = [&](BasicBlock *BB) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/123446