add support for zero initialized unions, patch by Tim Northover!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99818 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index c9c9857..bd08880 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -59,6 +59,7 @@
case Type::PointerTyID:
return ConstantPointerNull::get(cast<PointerType>(Ty));
case Type::StructTyID:
+ case Type::UnionTyID:
case Type::ArrayTyID:
case Type::VectorTyID:
return ConstantAggregateZero::get(Ty);
@@ -944,7 +945,8 @@
// Factory Function Implementation
ConstantAggregateZero* ConstantAggregateZero::get(const Type* Ty) {
- assert((Ty->isStructTy() || Ty->isArrayTy() || Ty->isVectorTy()) &&
+ assert((Ty->isStructTy() || Ty->isUnionTy()
+ || Ty->isArrayTy() || Ty->isVectorTy()) &&
"Cannot create an aggregate zero of non-aggregate type!");
LLVMContextImpl *pImpl = Ty->getContext().pImpl;
diff --git a/test/Feature/unions.ll b/test/Feature/unions.ll
index 9d6c36b..3cf8c3c 100644
--- a/test/Feature/unions.ll
+++ b/test/Feature/unions.ll
@@ -6,7 +6,9 @@
@union1 = constant union { i32, i8 } { i32 4 }
@union2 = constant union { i32, i8 } insertvalue(union { i32, i8 } undef, i32 4, 0)
+@union3 = common global %union.anon zeroinitializer, align 8
define void @"Unions" () {
ret void
}
+