|  | ; RUN: llvm-as < %s | opt -loop-reduce -disable-output | 
|  | ; PR 2537 | 
|  |  | 
|  | define void @a() { | 
|  | entry: | 
|  | br label %dobody | 
|  |  | 
|  | dobody:         ; preds = %dobody, %entry | 
|  | %y.0 = phi i128 [ 0, %entry ], [ %add, %dobody ] | 
|  | %x.0 = phi i128 [ 0, %entry ], [ %add2, %dobody ] | 
|  | %add = add i128 %y.0, shl (i128 1, i128 64) | 
|  | %add2 = add i128 %x.0, shl (i128 1, i128 48) | 
|  | call void @b( i128 %add ) | 
|  | %cmp = icmp ult i128 %add2, shl (i128 1, i128 64) | 
|  | br i1 %cmp, label %dobody, label %afterdo | 
|  |  | 
|  | afterdo:                ; preds = %dobody | 
|  | ret void | 
|  | } | 
|  |  | 
|  | declare void @b(i128 %add) |