Nice!
I opened a bug to track this (not only to make the fix, but perhaps the
other case is slower than it needs to be and we can fix it).
https://github.com/slavapestov/factor/issues/819
On Tue, Mar 26, 2013 at 11:28 AM, Loryn Jenkins <lor...@gmail.com> wrote:
> Hi
>
> I just noticed that math.functions round can be sped up. Compare the
> version from math.functions vs the comparison version.
>
> : round ( x -- y ) dup sgn 2 / + truncate ; inline
> : round2 ( x -- y ) dup sgn 0.5 * + truncate ; inline
>
> Testing = warm up execution of each statement, followed by 3 executions of
> gc [ 10000 [ 42.3 round drop ] times ] time
> gc [ 10000 [ 42.3 round2 drop ] times ] time
>
> round results = { 0.004365148 0.004394427 0.001917139 } average = 0.0036
> round2 results = { 0.001903133 0.001894752 0.001913334 } average = 0.0019
>
> averaged results show 1.89 times speedup
>
> on
> Mac OS X 10.8.3
> 2 GHz Intel Core 2 Duo
>
>
> Loryn Jenkins
>
>
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