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-rw-r--r--llvm/lib/CodeGen/FuncletLayout.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/FuncletLayout.cpp b/llvm/lib/CodeGen/FuncletLayout.cpp
index 67a4d1551c6..581cd423f2d 100644
--- a/llvm/lib/CodeGen/FuncletLayout.cpp
+++ b/llvm/lib/CodeGen/FuncletLayout.cpp
@@ -41,6 +41,9 @@ INITIALIZE_PASS(FuncletLayout, DEBUG_TYPE,
"Contiguously Lay Out Funclets", false, false)
bool FuncletLayout::runOnMachineFunction(MachineFunction &F) {
+ // Even though this gets information from getEHScopeMembership(), this pass is
+ // only necessary for funclet-based EH personalities, in which these EH scopes
+ // are outlined at the end.
DenseMap<const MachineBasicBlock *, int> FuncletMembership =
getEHScopeMembership(F);
if (FuncletMembership.empty())
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