| Nick Lewycky | ac0b62c | 2011-02-10 23:54:10 +0000 | [diff] [blame] | 1 | ; RUN: opt -jump-threading -disable-output %s |
| 2 | ; PR9112 |
| 3 | |
| 4 | ; This is actually a test for value tracking. Jump threading produces |
| 5 | ; "%phi = phi i16" when it removes all edges leading to %unreachable. |
| 6 | ; The .ll parser won't let us write that directly since it's invalid code. |
| 7 | |
| 8 | define void @func() nounwind { |
| 9 | entry: |
| 10 | br label %bb |
| 11 | |
| 12 | bb: |
| 13 | br label %bb |
| 14 | |
| 15 | unreachable: |
| 16 | %phi = phi i16 [ %add, %unreachable ], [ 0, %next ] |
| 17 | %add = add i16 0, %phi |
| 18 | %cmp = icmp slt i16 %phi, 0 |
| 19 | br i1 %cmp, label %unreachable, label %next |
| 20 | |
| 21 | next: |
| 22 | br label %unreachable |
| 23 | } |
| 24 | |