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+; RUN: llvm-as < %s | llc -march=x86-64 | grep BB1_1:
+; PR4126
+
+; Don't omit this label's definition.
+
+define void @bux(i32 %p_53) nounwind optsize {
+entry:
+ %0 = icmp eq i32 %p_53, 0 ; <i1> [#uses=1]
+ %1 = icmp sgt i32 %p_53, 0 ; <i1> [#uses=1]
+ %or.cond = and i1 %0, %1 ; <i1> [#uses=1]
+ br i1 %or.cond, label %bb.i, label %bb3
+
+bb.i: ; preds = %entry
+ %2 = add i32 %p_53, 1 ; <i32> [#uses=1]
+ %3 = icmp slt i32 %2, 0 ; <i1> [#uses=0]
+ br label %bb3
+
+bb3: ; preds = %bb.i, %entry
+ %4 = tail call i32 (...)* @baz(i32 0) nounwind ; <i32> [#uses=0]
+ ret void
+}
+
+declare i32 @baz(...)