[PATCH] D130441: RegAlloc: Use SmallSet instead of std::set

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
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There shouldn't be more than a small handful of hints at most.


https://reviews.llvm.org/D130441

Files:
  llvm/lib/CodeGen/CalcSpillWeights.cpp


Index: llvm/lib/CodeGen/CalcSpillWeights.cpp
===================================================================
--- llvm/lib/CodeGen/CalcSpillWeights.cpp
+++ llvm/lib/CodeGen/CalcSpillWeights.cpp
@@ -278,7 +278,7 @@
     if (TargetHint.first == 0 && TargetHint.second)
       MRI.clearSimpleHint(LI.reg());
 
-    std::set<Register> HintedRegs;
+    SmallSet<Register, 4> HintedRegs;
     for (const auto &Hint : CopyHints) {
       if (!HintedRegs.insert(Hint.Reg).second ||
           (TargetHint.first != 0 && Hint.Reg == TargetHint.second))


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