Don't bother storing undef elements of BUILD_VECTOR's
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26858 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index a0c10a0..d594cfe 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -794,6 +794,9 @@
unsigned VectorSize = MVT::getSizeInBits(VT)/8;
// Store (in the right endianness) the elements to memory.
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
+ // Ignore undef elements.
+ if (Node->getOperand(i).getOpcode() == ISD::UNDEF) continue;
+
unsigned Offset;
if (isLittleEndian)
Offset = TypeByteSize*i;
@@ -807,7 +810,12 @@
Node->getOperand(i), Idx,
DAG.getSrcValue(NULL)));
}
- SDOperand StoreChain = DAG.getNode(ISD::TokenFactor, MVT::Other, Stores);
+
+ SDOperand StoreChain;
+ if (!Stores.empty()) // Not all undef elements?
+ StoreChain = DAG.getNode(ISD::TokenFactor, MVT::Other, Stores);
+ else
+ StoreChain = DAG.getEntryNode();
// Result is a load from the stack slot.
Result = DAG.getLoad(VT, StoreChain, FIPtr, DAG.getSrcValue(0));