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Created on 2019-03-24 11:33 by nagayev, last changed 2022-04-11 14:59 by admin. This issue is now closed.
| Messages (4) | |||
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| msg338728 - (view) | Author: Марат Нагаев (nagayev) * | Date: 2019-03-24 11:33 | |
Hello.
I want to implement pow2 function special for powers of 2.
pow2 works 110 times faster if we pow 4 to 10**6
pow2 implementaion on Python:
def pow2(a,b):
p=log2(a)*b
if not p.isinteger():
raise TypeError('a isn't power of 2!')
return 1«p
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| msg338729 - (view) | Author: Марат Нагаев (nagayev) * | Date: 2019-03-24 11:34 | |
110 times is the result on MacBook 2017 13 In my phone this works 187 times faster! |
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| msg338730 - (view) | Author: Karthikeyan Singaravelan (xtreak) *  |
Date: 2019-03-24 12:07 | |
See also issue21420 in a previous attempt to optimize powers of 2 calculation in current code. |
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| msg338792 - (view) | Author: Serhiy Storchaka (serhiy.storchaka) * |
Date: 2019-03-25 08:44 | |
See also issue31980. The objections exposed there are applicable to this issue. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:12 | admin | set | github: 80596 |
| 2019-03-25 08:44:51 | serhiy.storchaka | set | status: open -> closed nosy: + serhiy.storchaka messages: + msg338792 resolution: rejected stage: resolved |
| 2019-03-24 12:07:29 | xtreak | set | nosy:
+ xtreak messages: + msg338730 |
| 2019-03-24 11:59:09 | SilentGhost | set | nosy:
+ mark.dickinson type: behavior |
| 2019-03-24 11:34:18 | nagayev | set | messages: + msg338729 |
| 2019-03-24 11:33:10 | nagayev | create | |