[PATCH] D117162: [DebugInfo][InstrRef] Short-circuit unnecessary preferred location map construction

[Eugene Zhulenev via Phabricator via llvm-commits]

ezhulenev created this revision.
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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117162

Files:
  llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp


Index: llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
===================================================================
--- llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
+++ llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
@@ -271,6 +271,12 @@
       return false;
     };
 
+    // Short-circuit unnecessary preferred location map construction.
+    if (VLocs.empty()) {
+      flushDbgValues(MBB.begin(), &MBB);
+      return;
+    }
+
     // Map of the preferred location for each value.
     std::map<ValueIDNum, LocIdx> ValueToLoc;
     ActiveMLocs.reserve(VLocs.size());


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