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DJ Omnimaga
http://i-lost-the-ga.me
Calc Guru
Joined: 14 Nov 2003
Posts: 1196
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 Posted: 26 Aug 2004 11:29:52 am Post subject: |
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In the old days of my secret BASIC project, I was making a map engine and I suddently noticed a mysterious bug with my game: After storing a very huge string using full of Sub( command, the calc would lose 8 KB of RAM during runtimeand slow down to half of the processor speed (3 MHz). After stopping the game everything came back to normal. The only way to counter this bug was to break the string into smaller pieces:
"::::::::::::::::::: ::YYYYYYYYYYYYY
Ans+Sub("AH",Z,1
Ans+"::::::::YYYYYYOOOOOOOOOOYYYYYYYYY
etc...
so the calc would not slow down.
Thsi happened on TI-OS 1.14 with 83+SE and 83+ Black model. |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 26 Aug 2004 03:36:34 pm Post subject: |
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| How big was the command again? |
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Arcane Wizard
`semi-hippie`
Super Elite (Last Title)
Joined: 02 Jun 2003
Posts: 8993
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| Posted: 26 Aug 2004 03:37:24 pm Post subject: |
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" ->Ans
Repeat 0
Ans+Ans
End
: o  |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 26 Aug 2004 04:01:58 pm Post subject: |
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| Does "storing a huge string full of sub( command" mean "sub(sub(sub..."? |
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Arcane Wizard
`semi-hippie`
Super Elite (Last Title)
Joined: 02 Jun 2003
Posts: 8993
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| Posted: 26 Aug 2004 04:08:25 pm Post subject: |
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| Judging from the example I'd say no, but I think it might both cause the same error and be part of the same problem. |
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DarkerLine
ceci n'est pas une |
Super Elite (Last Title)
Joined: 04 Nov 2003
Posts: 8328
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| Posted: 26 Aug 2004 04:14:06 pm Post subject: |
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Also fun: "expr(Str1 -> Str1 :expr(Str1
This is one of the only ways to get an ILLEGAL NEST error.
Back ontopic, maybe the reason this might happen is if the line was too big to be executed and TIOS had to do some clever shuffling of data. |
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Darth Android
DragonOS Dev Team
Bandwidth Hog
Joined: 31 May 2003
Posts: 2104
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| Posted: 26 Aug 2004 06:07:59 pm Post subject: |
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| i use 1.16 and have used sub( with strings over several hundred bytes before, no loss of spee or anything. |
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DJ Omnimaga
http://i-lost-the-ga.me
Calc Guru
Joined: 14 Nov 2003
Posts: 1196
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| Posted: 10 May 2011 09:11:09 pm Post subject: |
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Just an update: I had this issue happen again during the development of Illusiat 13: The Final Chapter, 2 years ago. Basically I had the following code: (It's messed up because SourceCoder doesn't display all tokens, but it should give you an idea)
Code:
:If G=14:Then
:If E=66:"XXXXXXXXXXXXXXXXWWWWWWWXXWWWWWWWWWWWWWWXXWWWWWWW XX XXXXXX XX XXXXXXWWWWWX XX XWWWWW X XX X XXXX=X XX X=XXXX
:If E=67:"XXXX=X XX X=XXXXXXXX X XX X XXXXXXXX X XX X XXXXXXXX X XX X XXXXXXXX W XX W XXXXXXXX W XX W XXXXXXXX XX XXXXXXXXXXXXXXXXXXXX
:If E=68:"XXWWWWWXXWWWWWXXXXWWWWWXXWW"+sub("H-",1+(L3(31)>L3(36)),1)+"WWXXXX XX = XXXX XX XXWW □ XX WWWW XX WW XX XXXXXXXXXXXXXXXX
:If E=69:"WWXXXXXXXXXXXXWWWWXWWWWWWWWWWXWW XWWWWWWWWWWX X X φφ X XX W X X W XX W X X W XX XXX XXX XXXXXXXX--XXXXXXX
:End
:If G=15:Then
:If E=66:"0000000000000000UUUUUUU00UUUUUUUUUUUUUU00UUUUUUU 00 000000 00 000000UUUUU0 00 0UUUUU 0 00 0 0000=0 00 0=0000
:If E=67:"0000=0 00 0=00000000 0 00 0 00000000 0 00 0 00000000 0 00 0 00000000 U 00 U 00000000 U 00 U 00000000 00 00000000000000000000
:If E=68:"00UUUUU00UUUUU0000UUUUU00UU"+sub("H-",1+(L3(32)>L3(36)),1)+"UU0000 00 = 0000 00 00UU □ 00 UUUU 00 UU 00 0000000000000000
:If E=69:"UU000000000000UUUU0UUUUUUUUUU0UU 0UUUUUUUUUU0 0 0 φφ 0 00 U 0 0 U 00 U 0 0 U 00 000 000 00000000--0000000
:End
:If G=16:Then
:If E=66:"ZZZZZZZZZZZZZZZZZZZZZZZZZZZZ ZZZZZ ZZZZZ = =
:If E=67:"= = Z Z Z Z
:If E=68:"ZZZZZZZZZZZZZZZZZ"+sub("H-",1+(L3(33)>L3(36)),1)+"ZZ = ZZ □ ZZZZ ZZ
:If E=69:"ZZZZZZZZZZZZZZZZZZ ZZZZZZZZZZ φφ Z Z Z Z --
:End
:If G=17:Then
:If E=66:"LLLLLLLLLLLLLLLLIIIIIIILLIIIIIIIIIIIIIILLIIIIIII LL LLLLLL LL LLLLLLIIIIIL LL LIIIII L LL L LLLL=L LL L=LLLL
:If E=67:"LLLL=L LL L=LLLLLLLL L LL L LLLLLLLL L LL L LLLLLLLL L LL L LLLLLLLL I LL I LLLLLLLL I LL I LLLLLLLL LL LLLLLLLLLLLLLLLLLLLL
:If E=68:"LLIIIIILLIIIIILLLLIIIIILLII"+sub("H-",1+(L3(34)>L3(36)),1)+"IILLLL LL = LLLL LL LLII □ LL IIII LL II LL LLLLLLLLLLLLLLLL
:If E=69:"IILLLLLLLLLLLLIIIILIIIIIIIIIILII LIIIIIIIIIIL L L φφ L LL I L L I LL I L L I LL LLL LLL LLLLLLLL--LLLLLLL
:End
Basically to get rid of the repetitiveness I simply stored the needed characters in other strings, then Str1+Str1+Str1+Str1+Str1+Str2+Str2+" "+Str1+Str2... and so on, to reduce code size, but doing so caused the slow down I got when I developed Dark Link Quest. As a result I was stuck with the code above.
(Note: I tested this after a RAM clear, making sure no ASM program is ran prior testing this. I just ran parts of the game)
I am bringing this up again because I now tested it on OS 1.18, 1.19 and on my TI-Nspire running OS 1.7 and it happened anyway. I think the TI-OS might have issues with the concatenation of a certain amount of strings together (Not that this is something TI intended people to do anyway  ).
The slow down seems similar to what happens with the For( command when you omit the closing parhentesis and it only contains a lone If that is false.
(Note: The data above were 16x8 ASCII tilemaps and the game, which was never finished, although still 90% complete, looked like this:
http://www.youtube.com/watch?v=yfad1g_1-mg
Last edited by Guest on 10 May 2011 09:15:34 pm; edited 1 time in total |
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mrmprog
Newbie
Joined: 04 Feb 2011
Posts: 44
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| Posted: 10 May 2011 09:14:48 pm Post subject: |
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| I think I heard about something like that before... |
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