From 7774be4a74be15305a4852efb9981847a7f1dad7 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 5 Jul 2007 07:19:45 +0000
Subject: [PATCH] Teach DAGISelEmitter about zero_reg.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37900 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/TableGen/DAGISelEmitter.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp
index 17114b0ebae..ca3d37a85a1 100644
--- a/utils/TableGen/DAGISelEmitter.cpp
+++ b/utils/TableGen/DAGISelEmitter.cpp
@@ -622,7 +622,8 @@ static std::vector<unsigned char> getImplicitType(Record *R, bool NotRegisters,
   } else if (R->getName() == "ptr_rc") {
     Other[0] = MVT::iPTR;
     return Other;
-  } else if (R->getName() == "node" || R->getName() == "srcvalue") {
+  } else if (R->getName() == "node" || R->getName() == "srcvalue" ||
+             R->getName() == "zero_reg") {
     // Placeholder.
     return Unknown;
   }
@@ -2711,6 +2712,12 @@ public:
                    getEnumName(N->getTypeNum(0)) + ");");
           NodeOps.push_back("Tmp" + utostr(ResNo));
           return NodeOps;
+        } else if (DI->getDef()->getName() == "zero_reg") {
+          emitCode("SDOperand Tmp" + utostr(ResNo) +
+                   " = CurDAG->getRegister(0, " +
+                   getEnumName(N->getTypeNum(0)) + ");");
+          NodeOps.push_back("Tmp" + utostr(ResNo));
+          return NodeOps;
         }
       } else if (IntInit *II = dynamic_cast<IntInit*>(N->getLeafValue())) {
         unsigned ResNo = TmpNo++;