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1; It is illegal to remove BB1 because it will mess up the PHI node!2;3; RUN: opt < %s -passes=adce -S | grep BB14 5define i32 @test(i1 %C, i32 %A, i32 %B) {6; <label>:07 br i1 %C, label %BB1, label %BB28 9BB1: ; preds = %010 br label %BB211 12BB2: ; preds = %BB1, %013 %R = phi i32 [ %A, %0 ], [ %B, %BB1 ] ; <i32> [#uses=1]14 ret i32 %R15}16 17