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-rw-r--r--utils/TableGen/CodeGenRegisters.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/utils/TableGen/CodeGenRegisters.cpp b/utils/TableGen/CodeGenRegisters.cpp
index 7330021..80765b6 100644
--- a/utils/TableGen/CodeGenRegisters.cpp
+++ b/utils/TableGen/CodeGenRegisters.cpp
@@ -236,7 +236,8 @@ struct TupleExpander : SetTheory::Expander {
if (RV.getName() == "DwarfNumbers" ||
RV.getName() == "DwarfAlias" ||
RV.getName() == "Aliases") {
- NewReg->addValue(*RegisterCl->getValue(RV.getName()));
+ if (const RecordVal *DefRV = RegisterCl->getValue(RV.getName()))
+ NewReg->addValue(*DefRV);
continue;
}