Fix subtraction underflow bug #898
| Job | Run time |
|---|---|
| 53s | |
| 2m 33s | |
| 2m 21s | |
| 34s | |
| 1m 25s | |
| 1m 55s | |
| 2m 5s | |
| 33s | |
| 2m 10s | |
| 37s | |
| 2m 0s | |
| 39s | |
| 1m 12s | |
| 1m 59s | |
| 1m 53s | |
| 2m 1s | |
| 1m 55s | |
| 2m 15s | |
| 2m 23s | |
| 2m 21s | |
| 2m 19s | |
| 2m 9s | |
| 2m 8s | |
| 2m 11s | |
| 2m 10s | |
| 1m 13s | |
| 2m 0s | |
| 1m 56s | |
| 2m 4s | |
| 1m 55s | |
| 2m 7s | |
| 2m 17s | |
| 2m 11s | |
| 1m 27s | |
| 59s | |
| 2m 51s | |
| 1m 3s | |
| 1m 58s | |
| 1m 7s | |
| 1h 9m 49s |