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; RUN: opt -flattencfg -S < %s | FileCheck %s


; This test checks whether the pass completes without a crash.
; The code is not transformed in any way
;
; CHECK-LABEL: @test_not_crash
define void @test_not_crash(i32 %in_a) #0 {
entry:
  %cmp0 = icmp eq i32 %in_a, -1
  %cmp1 = icmp ne i32 %in_a, 0
  %cond0 = and i1 %cmp0, %cmp1
  br i1 %cond0, label %b0, label %b1

b0:                                ; preds = %entry
  %cmp2 = icmp eq i32 %in_a, 0
  %cmp3 = icmp ne i32 %in_a, 1
  %cond1 = or i1 %cmp2, %cmp3
  br i1 %cond1, label %exit, label %b1

b1:                                       ; preds = %entry, %b0
  br label %exit

exit:                               ; preds = %entry, %b0, %b1
  ret void
}