| ; RUN: opt < %s -loop-extract-single -disable-output | 
 |  | 
 | define void @ab() { | 
 | entry: | 
 |         br label %codeReplTail | 
 |  | 
 | then.1:         ; preds = %codeReplTail | 
 |         br label %loopentry.1 | 
 |  | 
 | loopentry.1:            ; preds = %no_exit.1, %then.1 | 
 |         br i1 false, label %no_exit.1, label %loopexit.0.loopexit1 | 
 |  | 
 | no_exit.1:              ; preds = %loopentry.1 | 
 |         br label %loopentry.1 | 
 |  | 
 | loopexit.0.loopexit:            ; preds = %codeReplTail | 
 |         ret void | 
 |  | 
 | loopexit.0.loopexit1:           ; preds = %loopentry.1 | 
 |         ret void | 
 |  | 
 | codeReplTail:           ; preds = %codeReplTail, %entry | 
 |         switch i16 0, label %codeReplTail [ | 
 |                  i16 0, label %loopexit.0.loopexit | 
 |                  i16 1, label %then.1 | 
 |         ] | 
 | } | 
 |  |