From: Owen Anderson <resistor@mac.com>
Date: Thu, 28 Apr 2011 17:51:45 +0000 (+0000)
Subject: Fix a bug in tblgen that caused incorrect encodings on instructions that specified... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4cdcb4772d95b9e801a0f3cd43776cef3af3b530;p=oota-llvm.git

Fix a bug in tblgen that caused incorrect encodings on instructions that specified operands with "bit" instead of "bits<1>".
Unfortunately, my only testcase for this is fragile, and the ARM AsmParser can't round trip the instruction in question.
<rdar://problem/9345702>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130410 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/utils/TableGen/CodeEmitterGen.cpp b/utils/TableGen/CodeEmitterGen.cpp
index 957dd19da1c..9d4dc5c4607 100644
--- a/utils/TableGen/CodeEmitterGen.cpp
+++ b/utils/TableGen/CodeEmitterGen.cpp
@@ -63,10 +63,14 @@ void CodeEmitterGen::reverseBits(std::vector<Record*> &Insts) {
 // return the variable bit position.  Otherwise return -1.
 int CodeEmitterGen::getVariableBit(const std::string &VarName,
                                    BitsInit *BI, int bit) {
-  if (VarBitInit *VBI = dynamic_cast<VarBitInit*>(BI->getBit(bit)))
+  if (VarBitInit *VBI = dynamic_cast<VarBitInit*>(BI->getBit(bit))) {
     if (VarInit *VI = dynamic_cast<VarInit*>(VBI->getVariable()))
       if (VI->getName() == VarName)
         return VBI->getBitNum();
+  } else if (VarInit *VI = dynamic_cast<VarInit*>(BI->getBit(bit))) {
+    if (VI->getName() == VarName)
+      return 0;
+  }
 
   return -1;
 }