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From: Sebastian Gniazdowski <psprint@fastmail.com>
To: zsh-workers@zsh.org
Subject: Re: Possible huge setarrvalue optimization
Date: Thu, 17 Nov 2016 23:09:22 -0800	[thread overview]
Message-ID: <1479452962.1316016.791840001.098168A4@webmail.messagingengine.com> (raw)
In-Reply-To: <1479449829.1305485.791811385.14DDFE28@webmail.messagingengine.com>

More, the optimization would apparently allow doing the following:

typeset -a arr
max_size=100
arr[max_size]=""

for (( i=1, i<=max_size, i ++ )); do
    arr[i]="some data"
done

I was haunted by current implementation when writing morphogenesis
screen saver (https://asciinema.org/a/47242), it has arrays that
represent coordinates on screen:

https://github.com/psprint/zsh-morpho/blob/5b84d919b5bbb7183ae78635adb995ab4c3ee7da/zmorpho#L11-L15

I've had to use integer-indexed hashes instead of regular arrays, which
were very slow. After the opt I will be able to test is-at-least 5.3 and
use regular arrays, maybe even pre-allocated with the `max_size`
solution.

-- 
  Sebastian Gniazdowski
  psprint@fastmail.com


  reply	other threads:[~2016-11-18  7:09 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-18  6:17 Sebastian Gniazdowski
2016-11-18  7:09 ` Sebastian Gniazdowski [this message]
2016-11-18  9:32 ` Sebastian Gniazdowski
2016-11-18 12:20   ` Sebastian Gniazdowski
2016-11-20 11:46     ` Daniel Shahaf
2016-11-20 17:41       ` Bart Schaefer
2016-11-20 20:54         ` Sebastian Gniazdowski
2016-11-20 21:19         ` Peter Stephenson
2016-12-24 17:19         ` Daniel Shahaf
2017-01-04 18:31           ` Sebastian Gniazdowski
2017-01-05  4:13             ` Daniel Shahaf
2017-01-05 13:32               ` Sebastian Gniazdowski
2017-01-05 15:47                 ` Daniel Shahaf

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