diff options
| -rw-r--r-- | lib/Analysis/RegionInfo.cpp | 3 | ||||
| -rw-r--r-- | test/Analysis/RegionInfo/unreachable_bb.ll | 29 |
2 files changed, 31 insertions, 1 deletions
diff --git a/lib/Analysis/RegionInfo.cpp b/lib/Analysis/RegionInfo.cpp index 81ef650..8577025 100644 --- a/lib/Analysis/RegionInfo.cpp +++ b/lib/Analysis/RegionInfo.cpp @@ -114,7 +114,8 @@ void Region::replaceExitRecursive(BasicBlock *NewExit) { bool Region::contains(const BasicBlock *B) const { BasicBlock *BB = const_cast<BasicBlock*>(B); - assert(DT->getNode(BB) && "BB not part of the dominance tree"); + if (!DT->getNode(BB)) + return false; BasicBlock *entry = getEntry(), *exit = getExit(); diff --git a/test/Analysis/RegionInfo/unreachable_bb.ll b/test/Analysis/RegionInfo/unreachable_bb.ll new file mode 100644 index 0000000..626ccbe --- /dev/null +++ b/test/Analysis/RegionInfo/unreachable_bb.ll @@ -0,0 +1,29 @@ +; RUN: opt -regions -analyze < %s | FileCheck %s + +; We should not crash if there are some bbs that are not reachable. +define void @f() { +entry: + br label %for.pre + +notintree: ; No predecessors! + br label %ret + +for.pre: ; preds = %entry + br label %for + +for: ; preds = %for.inc, %for.pre + %indvar = phi i64 [ 0, %for.pre ], [ %indvar.next, %for.inc ] + %exitcond = icmp ne i64 %indvar, 200 + br i1 %exitcond, label %for.inc, label %ret + +for.inc: ; preds = %for + %indvar.next = add i64 %indvar, 1 + br label %for + +ret: ; preds = %for, %notintree + ret void +} + +; CHECK: [0] entry => <Function Return> +; CHECK: [1] for => ret + |