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Forum Index : Microcontroller and PC projects : Good ol' Windoze, doing its thing...(MMB4W)

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Tinine
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Joined: 30/03/2016
Location: United Kingdom
Posts: 1646

Posted: 01:36pm 22 Aug 2022

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Although, curiously, when I test the same routine in QBjs, the result is consistently 2.0000000ms and the only flyer was something like 2.999999ms

Craig

JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 4147

Posted: 02:09pm 22 Aug 2022

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Give us a clue with what the program is!

John

Tinine
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Joined: 30/03/2016
Location: United Kingdom
Posts: 1646

Posted: 02:20pm 22 Aug 2022

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I was just testing the CAT function again. The manual states that it's faster but at least the way I'm using it, this is not the case:

a$=chr$(170)
b$=a$
c$=a$
d$=a$
e$=a$

timer=0
for i = 1 to 1000
a$=a$+b$+c$+d$+e$
a$=chr$(170)
next
print timer

timer=0
for i = 1 to 1000
cat a$,b$
cat a$,c$
cat a$,d$
cat a$,e$
a$=chr$(170)
next
print timer

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10628

Posted: 03:00pm 22 Aug 2022

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Quote The manual states that it's faster but at least the way I'm using it, this is not the case:

The increased speed is a function of the number of variable lookups in a single statement. In your code there are 6 in the first version and 8 in the second and 1 statement in the first and 4 in the second hence it is slower in your usage.

Compare the simple case

inc a$,b$

vs

[LET] a$=A$+b$

where it is 2 vs 3 hence quicker
Edited 2022-08-23 01:01 by matherp

Tinine
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Joined: 30/03/2016
Location: United Kingdom
Posts: 1646

Posted: 03:26pm 22 Aug 2022

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Makes sense, Pete because on the more consistent Pico, the 6:8 ratio is pretty much what I get.

Of course, I had to try

cat a$,b$,c$,d$,e$

In the hope that the manual was wrong

Craig

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