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-rw-r--r--llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index 1315e19732f..7d404473655 100644
--- a/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -544,7 +544,8 @@ void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F, BasicBlock &BB,
Type *Int32PtrTy = PointerType::getUnqual(IRB.getInt32Ty());
GuardP = IRB.CreateIntToPtr(GuardP, Int32PtrTy);
if (Options.TracePC) {
- IRB.CreateCall(SanCovTracePC);
+ IRB.CreateCall(SanCovTracePC); // gets the PC using GET_CALLER_PC.
+ IRB.CreateCall(EmptyAsm, {}); // Avoids callback merge.
} else if (Options.TraceBB) {
IRB.CreateCall(IsEntryBB ? SanCovTraceEnter : SanCovTraceBB, GuardP);
} else if (UseCalls) {
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