benchmarking f32 step calculation (#11890)

* benchmark steps with f32

* divide by self.steps - 1

* avoid steps <= 1

* Fix step size

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Fix 'steps' print and print number of args

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* Add Test

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* fix comments

* Remove unneeded comment

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: parity-processbot <>