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

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Mar 4, 2025
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[CodeGen] Avoid repeated hash lookups (NFC) #129652

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4 changes: 2 additions & 2 deletions llvm/lib/CodeGen/MachineBlockPlacement.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
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