[DebugInfo][InstrRef] Short-circuit unnecessary preferred location map construction

Reviewed By: cota Differential Revision: https://reviews.llvm.org/D117162
2022-01-13 02:19:44 -08:00 · 2022-01-13 02:19:44 -08:00 · 764e52f0d4
parent fc7a9f36a9
commit 764e52f0d4
1 changed files with 5 additions and 0 deletions
--- a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
+++ b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
@ -283,6 +283,11 @@ public:
      LocIdx Idx = Location.Idx;
      ValueIDNum &VNum = MLocs[Idx.asU64()];
      VarLocs.push_back(VNum);
+
+      // Short-circuit unnecessary preferred location update.
+      if (VLocs.empty())
+        continue;
+
      auto it = ValueToLoc.find(VNum);
      // In order of preference, pick:
      //  * Callee saved registers,