[llvm] a699b2f - [InstrProf] Mark counters as used in debug correlation mode

[Ellis Hoag via llvm-commits]

Author: Ellis Hoag
Date: 2021-12-30T14:50:45-08:00
New Revision: a699b2f1c029c2f19fa5673370fdb7d68871ae03

URL: https://github.com/llvm/llvm-project/commit/a699b2f1c029c2f19fa5673370fdb7d68871ae03
DIFF: https://github.com/llvm/llvm-project/commit/a699b2f1c029c2f19fa5673370fdb7d68871ae03.diff

LOG: [InstrProf] Mark counters as used in debug correlation mode

In debug info correlation mode we do not emit the data globals so we
need to explicitly mark the counter globals as used so they don't get
stripped.

Reviewed By: kyulee

Differential Revision: https://reviews.llvm.org/D115981

Added: 
    

Modified: 
    llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp b/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
index de34348606efc..73f208abcb07a 100644
--- a/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
+++ b/llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp
@@ -997,8 +997,11 @@ InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
         ConstantExpr::getBitCast(ValuesVar, Type::getInt8PtrTy(Ctx));
   }
 
-  if (DebugInfoCorrelate)
+  if (DebugInfoCorrelate) {
+    // Mark the counter variable as used so that it isn't optimized out.
+    CompilerUsedVars.push_back(PD.RegionCounters);
     return PD.RegionCounters;
+  }
 
   // Create data variable.
   auto *IntPtrTy = M->getDataLayout().getIntPtrType(M->getContext());