Fix Intrinsic::getType not working with vararg

VarArg Intrinsic functions are encoded with "void" type as the last
argument. Now Intrinsic::getType can correctly return all the intrinsic
function type.

llvm-svn: 220205

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/IR/Function.cpp b/llvm/lib/IR/Function.cpp
index 83f71a89162..13747cafec9 100644
--- a/llvm/lib/IR/Function.cpp
+++ b/llvm/lib/IR/Function.cpp
@@ -739,6 +739,12 @@ FunctionType *Intrinsic::getType(LLVMContext &Context,
   while (!TableRef.empty())
     ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
 
+  // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
+  // If we see void type as the type of the last argument, it is vararg intrinsic
+  if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
+    ArgTys.pop_back();
+    return FunctionType::get(ResultTy, ArgTys, true);
+  }
   return FunctionType::get(ResultTy, ArgTys, false);
 }