From e197ee9127cad226b0bb488a251a6ae08d160a34 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Mon, 3 Mar 2025 07:42:28 -0800
Subject: [PATCH] [CodeGen] Avoid repeated hash lookups (NFC)

---
 llvm/lib/CodeGen/MachineBlockPlacement.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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;