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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