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      1 ; RUN: opt -S < %s -jump-threading | FileCheck %s
      2 ; CHECK-LABEL: @foo
      3 ; CHECK: bb6:
      4 ; CHECK-NEXT: ret void
      5 ; CHECK: bb3:
      6 ; CHECK: br label %bb3
      7 define void @foo() {
      8 entry:
      9   br i1 true, label %bb6, label %bb3
     10 
     11 bb3:
     12   %x0 = phi i32 [ undef, %entry ], [ %x1, %bb5 ]
     13   %y  = and i64 undef, 1
     14   %p  = icmp ne i64 %y, 0
     15   br i1 %p, label %bb4, label %bb5
     16 
     17 bb4:
     18   br label %bb5
     19 
     20 bb5:
     21   %x1 = phi i32 [ %x0, %bb3 ], [ %x0, %bb4 ]
     22   %z  = phi i32 [ 0, %bb3 ], [ 1, %bb4 ]
     23   %q  = icmp eq i32 %z, 0
     24   br i1 %q, label %bb3, label %bb6
     25 
     26 bb6:
     27   ret void
     28 }
     29 
     30 ; CHECK-LABEL: @bar
     31 ; Just check that we don't crash on this test.
     32 define void @bar(i1 %p) {
     33 entry:
     34   br i1 false, label %bb2, label %exit
     35 
     36 bb2:
     37   %x0 = phi i32 [ undef, %entry ], [ %x1, %bb5 ]
     38   br i1 %p, label %bb3, label %bb4
     39 
     40 bb3:
     41   br label %bb5
     42 
     43 bb4:
     44   br label %bb5
     45 
     46 bb5:
     47   %x1 = phi i32 [ %x0, %bb3 ], [ 0, %bb4 ]
     48   switch i32 %x1, label %exit [
     49     i32 10, label %bb2
     50   ]
     51 
     52 exit:
     53   ret void
     54 }
     55