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authorChris Lattner <sabre@nondot.org>2010-02-12 20:49:41 +0000
committerChris Lattner <sabre@nondot.org>2010-02-12 20:49:41 +0000
commitfdfeb6976f07ad10d809b922ed7376ba2a3539be (patch)
treef6ba4446fc9db081e5e3386c57d2db253774c1fa /lib/VMCore/ConstantFold.cpp
parentb3e1bf54b29354c6d332cfaffcc86cd776fd4ca8 (diff)
Add support for a union type in LLVM IR. Patch by Talin!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96011 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore/ConstantFold.cpp')
-rw-r--r--lib/VMCore/ConstantFold.cpp6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp
index 5c117d8a18..4a245d22c3 100644
--- a/lib/VMCore/ConstantFold.cpp
+++ b/lib/VMCore/ConstantFold.cpp
@@ -885,6 +885,8 @@ Constant *llvm::ConstantFoldInsertValueInstruction(Constant *Agg,
unsigned numOps;
if (const ArrayType *AR = dyn_cast<ArrayType>(AggTy))
numOps = AR->getNumElements();
+ else if (isa<UnionType>(AggTy))
+ numOps = 1;
else
numOps = cast<StructType>(AggTy)->getNumElements();
@@ -901,6 +903,10 @@ Constant *llvm::ConstantFoldInsertValueInstruction(Constant *Agg,
if (const StructType* ST = dyn_cast<StructType>(AggTy))
return ConstantStruct::get(ST->getContext(), Ops, ST->isPacked());
+ if (const UnionType* UT = dyn_cast<UnionType>(AggTy)) {
+ assert(Ops.size() == 1 && "Union can only contain a single value!");
+ return ConstantUnion::get(UT, Ops[0]);
+ }
return ConstantArray::get(cast<ArrayType>(AggTy), Ops);
}