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-rw-r--r--utils/TableGen/CodeGenInstruction.cpp7
1 files changed, 7 insertions, 0 deletions
diff --git a/utils/TableGen/CodeGenInstruction.cpp b/utils/TableGen/CodeGenInstruction.cpp
index 751326c..b4f9d15 100644
--- a/utils/TableGen/CodeGenInstruction.cpp
+++ b/utils/TableGen/CodeGenInstruction.cpp
@@ -424,6 +424,13 @@ bool CodeGenInstAlias::tryAliasOpMatch(DagInit *Result, unsigned AliasOpNo,
// Handle explicit registers.
if (ADI && ADI->getDef()->isSubClassOf("Register")) {
+ if (InstOpRec->isSubClassOf("OptionalDefOperand")) {
+ DagInit *DI = InstOpRec->getValueAsDag("MIOperandInfo");
+ // The operand info should only have a single (register) entry. We
+ // want the register class of it.
+ InstOpRec = dynamic_cast<DefInit*>(DI->getArg(0))->getDef();
+ }
+
if (InstOpRec->isSubClassOf("RegisterOperand"))
InstOpRec = InstOpRec->getValueAsDef("RegClass");