From: Jim Grosbach <grosbach@apple.com>
Date: Fri, 19 Aug 2011 20:33:06 +0000 (+0000)
Subject: Allow non zero_reg explicit values for OptionalDefOperands in aliases.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c68e927488819efd671207786baadce6cae7266c;p=oota-llvm.git

Allow non zero_reg explicit values for OptionalDefOperands in aliases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138073 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/utils/TableGen/CodeGenInstruction.cpp b/utils/TableGen/CodeGenInstruction.cpp
index 751326c8ad2..b4f9d150716 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");