IR: Fix BasicBlock::phis for empty blocks
llvm-svn: 321567
diff --git a/llvm/lib/IR/BasicBlock.cpp b/llvm/lib/IR/BasicBlock.cpp
index 2251392..938c401 100644
--- a/llvm/lib/IR/BasicBlock.cpp
+++ b/llvm/lib/IR/BasicBlock.cpp
@@ -264,7 +264,8 @@
}
iterator_range<BasicBlock::phi_iterator> BasicBlock::phis() {
- return make_range<phi_iterator>(dyn_cast<PHINode>(&front()), nullptr);
+ PHINode *P = empty() ? nullptr : dyn_cast<PHINode>(&*begin());
+ return make_range<phi_iterator>(P, nullptr);
}
/// This method is used to notify a BasicBlock that the