Use proper libm power method for f64s
#17356
| Job | Run time |
|---|---|
| 17m 3s | |
| 2m 59s | |
| 3m 25s | |
| 4m 27s | |
| 8m 7s | |
| 5m 48s | |
| 7m 21s | |
| 5m 13s | |
| 1h 37m 25s | |
| 4m 35s | |
| 1h 9m 9s | |
| 2h 1m 49s | |
| 2h 1m 40s | |
| 15s | |
| 1h 7m 29s | |
| 1h 19m 47s | |
| 57m 53s | |
| 1h 2m 28s | |
| 15m 26s | |
| 6h 0m 17s | |
| 1m 1s | |
| 2m 3s | |
| 4m 16s | |
| 18h 39m 56s |