Avoid creating virtual registers for unused values.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101480 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 412de1c..71da0ab 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -918,10 +918,10 @@
/// created for it, emit nodes to copy the value into the virtual
/// registers.
void SelectionDAGBuilder::CopyToExportRegsIfNeeded(const Value *V) {
- if (!V->use_empty()) {
- DenseMap<const Value *, unsigned>::iterator VMI = FuncInfo.ValueMap.find(V);
- if (VMI != FuncInfo.ValueMap.end())
- CopyValueToVirtualRegister(V, VMI->second);
+ DenseMap<const Value *, unsigned>::iterator VMI = FuncInfo.ValueMap.find(V);
+ if (VMI != FuncInfo.ValueMap.end()) {
+ assert(!V->use_empty() && "Unused value assigned virtual registers!");
+ CopyValueToVirtualRegister(V, VMI->second);
}
}