1 files changed, 54 insertions, 0 deletions
diff --git a/llvm/test/Transforms/JumpThreading/removed-use.ll b/llvm/test/Transforms/JumpThreading/removed-use.ll
new file mode 100644
index 00000000000..bc97429cbae
--- /dev/null
+++ b/llvm/test/Transforms/JumpThreading/removed-use.ll
@@ -0,0 +1,54 @@
+; RUN: opt -S < %s -jump-threading | FileCheck %s
+; CHECK-LABEL: @foo
+; CHECK: bb6:
+; CHECK-NEXT: ret void
+; CHECK: bb3:
+; CHECK: br label %bb3
+define void @foo() {
+entry:
+  br i1 true, label %bb6, label %bb3
+
+bb3:
+  %x0 = phi i32 [ undef, %entry ], [ %x1, %bb5 ]
+  %y  = and i64 undef, 1
+  %p  = icmp ne i64 %y, 0
+  br i1 %p, label %bb4, label %bb5
+
+bb4:
+  br label %bb5
+
+bb5:
+  %x1 = phi i32 [ %x0, %bb3 ], [ %x0, %bb4 ]
+  %z  = phi i32 [ 0, %bb3 ], [ 1, %bb4 ]
+  %q  = icmp eq i32 %z, 0
+  br i1 %q, label %bb3, label %bb6
+
+bb6:
+  ret void
+}
+
+; CHECK-LABEL: @bar
+; Just check that we don't crash on this test.
+define void @bar(i1 %p) {
+entry:
+  br i1 false, label %bb2, label %exit
+
+bb2:
+  %x0 = phi i32 [ undef, %entry ], [ %x1, %bb5 ]
+  br i1 %p, label %bb3, label %bb4
+
+bb3:
+  br label %bb5
+
+bb4:
+  br label %bb5
+
+bb5:
+  %x1 = phi i32 [ %x0, %bb3 ], [ 0, %bb4 ]
+  switch i32 %x1, label %exit [
+    i32 10, label %bb2
+  ]
+
+exit:
+  ret void
+}