[llvm] ef94d8a - [CodeGen] Avoid repeated hash lookups (NFC) (#129652)

[via llvm-commits]

Author: Kazu Hirata
Date: 2025-03-04T01:49:48-08:00
New Revision: ef94d8a0f2d885d1753cd39c1ea76fe21a69d93b

URL: https://github.com/llvm/llvm-project/commit/ef94d8a0f2d885d1753cd39c1ea76fe21a69d93b
DIFF: https://github.com/llvm/llvm-project/commit/ef94d8a0f2d885d1753cd39c1ea76fe21a69d93b.diff

LOG: [CodeGen] Avoid repeated hash lookups (NFC) (#129652)

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 c61b8eb5e7b9c..9ccfadc318fa4 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -1792,12 +1792,12 @@ MachineBasicBlock *MachineBlockPlacement::getFirstUnplacedBlock(
 
   for (MachineFunction::iterator I = PrevUnplacedBlockIt, E = F->end(); I != E;
        ++I) {
-    if (BlockToChain[&*I] != &PlacedChain) {
+    if (BlockChain *Chain = BlockToChain[&*I]; Chain != &PlacedChain) {
       PrevUnplacedBlockIt = I;
       // Now select the head of the chain to which the unplaced block belongs
       // as the block to place. This will force the entire chain to be placed,
       // and satisfies the requirements of merging chains.
-      return *BlockToChain[&*I]->begin();
+      return *Chain->begin();
     }
   }
   return nullptr;