[llvm] 19a7fe0 - [CodeGen] Avoid repeated hash lookups (NFC) (#123894)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-01-22T00:17:55-08:00
New Revision: 19a7fe03b4f58c4f73ea91d5e63bc4c6e61f987b

URL: https://github.com/llvm/llvm-project/commit/19a7fe03b4f58c4f73ea91d5e63bc4c6e61f987b
DIFF: https://github.com/llvm/llvm-project/commit/19a7fe03b4f58c4f73ea91d5e63bc4c6e61f987b.diff

LOG: [CodeGen] Avoid repeated hash lookups (NFC) (#123894)

Added: 
    

Modified: 
    llvm/lib/CodeGen/MachineBlockPlacement.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index 05bc4cf646f421..c61b8eb5e7b9ce 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -3178,11 +3178,11 @@ bool MachineBlockPlacement::maybeTailDuplicateBlock(
     // Conservative default.
     bool InWorkList = true;
     // Remove from the Chain and Chain Map
-    if (BlockToChain.count(RemBB)) {
-      BlockChain *Chain = BlockToChain[RemBB];
+    if (auto It = BlockToChain.find(RemBB); It != BlockToChain.end()) {
+      BlockChain *Chain = It->second;
       InWorkList = Chain->UnscheduledPredecessors == 0;
       Chain->remove(RemBB);
-      BlockToChain.erase(RemBB);
+      BlockToChain.erase(It);
     }
 
     // Handle the unplaced block iterator