[Factor-talk] Speedup to math.functions round
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 [ 1 [ 42.3 round drop ] times ] time
gc [ 1 [ 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
--
Own the Future-Intelreg; Level Up Game Demo Contest 2013
Rise to greatness in Intel's independent game demo contest.
Compete for recognition, cash, and the chance to get your game
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[Factor-talk] Speedup to math.functions round
Apologies. This version contains amended run data.
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 [ 1 [ 42.3 round drop ] times ] time
gc [ 1 [ 42.3 round2 drop ] times ] time
round results = { 0.004365148 0.004394427 0.004361589 } average = 0.0044
round2 results = { 0.001903133 0.001894752 0.001913334 } average = 0.0019
averaged results show 2.32 times speedup
on
Mac OS X 10.8.3
2 GHz Intel Core 2 Duo
Loryn Jenkins
--
Own the Future-Intelreg; Level Up Game Demo Contest 2013
Rise to greatness in Intel's independent game demo contest.
Compete for recognition, cash, and the chance to get your game
on Steam. $5K grand prize plus 10 genre and skill prizes.
Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d___
Factor-talk mailing list
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Re: [Factor-talk] Speedup to math.functions round
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 [ 1 [ 42.3 round drop ] times ] time
gc [ 1 [ 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
--
Own the Future-Intelreg; Level Up Game Demo Contest 2013
Rise to greatness in Intel's independent game demo contest.
Compete for recognition, cash, and the chance to get your game
on Steam. $5K grand prize plus 10 genre and skill prizes.
Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d
___
Factor-talk mailing list
Factor-talk@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/factor-talk
--
Own the Future-Intelreg; Level Up Game Demo Contest 2013
Rise to greatness in Intel's independent game demo contest.
Compete for recognition, cash, and the chance to get your game
on Steam. $5K grand prize plus 10 genre and skill prizes.
Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d___
Factor-talk mailing list
Factor-talk@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/factor-talk
[Factor-talk] Back to the future
Some ideas reminiscent of philosophies of Factor ... http://www.youtube.com/watch?v=tc4ROCJYbm0 -- Own the Future-Intelreg; Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
