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      1 ; RUN: opt < %s -lcssa -disable-output
      2 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
      3 target triple = "x86_64-unknown-linux-gnu"
      4 
      5 ; PR28608
      6 ; Check that we don't crash on this test.
      7 
      8 define void @foo() {
      9 entry:
     10   br label %bb1
     11 
     12 bb1:
     13   br label %bb2
     14 
     15 bb2:
     16   %x = phi i32 [ undef, %bb5 ], [ undef, %bb1 ]
     17   br i1 undef, label %bb3, label %bb6
     18 
     19 bb3:
     20   br i1 undef, label %bb5, label %bb4
     21 
     22 bb4:
     23   br label %bb6
     24 
     25 bb5:
     26   br label %bb2
     27 
     28 bb6:
     29   br label %bb1
     30 
     31 exit:
     32   %y = add i32 0, %x
     33   ret void
     34 }
     35 
     36