2 files changed, 9 insertions, 5 deletions
diff --git a/lib/Bytecode/Reader/InstructionReader.cpp b/lib/Bytecode/Reader/InstructionReader.cpp
index e2c8336e95..2fc52ad71a 100644
--- a/lib/Bytecode/Reader/InstructionReader.cpp
+++ b/lib/Bytecode/Reader/InstructionReader.cpp
@@ -130,11 +130,15 @@ bool BytecodeParser::ParseInstruction(const uchar *&Buf, const uchar *EndBuf,
 
   Value *V;
   switch (Raw.Opcode) {
+  case Instruction::VarArg:
   case Instruction::Cast: {
     V = getValue(Raw.Ty, Raw.Arg1);
     const Type *Ty = getType(Raw.Arg2);
     if (V == 0 || Ty == 0) { std::cerr << "Invalid cast!\n"; return true; }
-    Res = new CastInst(V, Ty);
+    if (Raw.Opcode == Instruction::Cast)
+      Res = new CastInst(V, Ty);
+    else
+      Res = new VarArgInst(V, Ty);
     return false;
   }
   case Instruction::PHINode: {
diff --git a/lib/Bytecode/Writer/InstructionWriter.cpp b/lib/Bytecode/Writer/InstructionWriter.cpp
index 587e6d1be6..63aede198e 100644
--- a/lib/Bytecode/Writer/InstructionWriter.cpp
+++ b/lib/Bytecode/Writer/InstructionWriter.cpp
@@ -35,7 +35,7 @@ static void outputInstructionFormat0(const Instruction *I,
   output_vbr(Type, Out);                         // Result type
 
   unsigned NumArgs = I->getNumOperands();
-  output_vbr(NumArgs + isa<CastInst>(I), Out);
+  output_vbr(NumArgs + (isa<CastInst>(I) || isa<VarArgInst>(I)), Out);
 
   for (unsigned i = 0; i < NumArgs; ++i) {
     int Slot = Table.getValSlot(I->getOperand(i));
@@ -43,9 +43,9 @@ static void outputInstructionFormat0(const Instruction *I,
     output_vbr((unsigned)Slot, Out);
   }
 
-  if (isa<CastInst>(I)) {
+  if (isa<CastInst>(I) || isa<VarArgInst>(I)) {
     int Slot = Table.getValSlot(I->getType());
-    assert(Slot != -1 && "Cast return type unknown?");
+    assert(Slot != -1 && "Cast/VarArg return type unknown?");
     output_vbr((unsigned)Slot, Out);
   }
 
@@ -218,7 +218,7 @@ void BytecodeWriter::processInstruction(const Instruction &I) {
   if (Slot > MaxOpSlot) MaxOpSlot = Slot;
 
   // Handle the special case for cast...
-  if (isa<CastInst>(I)) {
+  if (isa<CastInst>(I) || isa<VarArgInst>(I)) {
     // Cast has to encode the destination type as the second argument in the
     // packet, or else we won't know what type to cast to!
     Slots[1] = Table.getValSlot(I.getType());