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Forum Index : Microcontroller and PC projects : CMM2 Unstructured Faster Than Structured?

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toml_12953
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Joined: 13/02/2015
Location: United States
Posts: 480

Posted: 09:51am 03 Sep 2021

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On the web page

Calculator Performance Index

There are a number of programs to measure a performance index. I ran both the unstructured BASIC version:

2 loops=1000
5 TIMER=0
10 N=1000
20 L=10
30 X=L
40 X=X+1
50 X=X-4.567E-4
60 X=X+70
70 X=X-69
80 X=X*7
90 X=X/11
100 L=L-1
110 IF L<>0 THEN 30
120 X=LOG(X)
130 X=SIN(X)
140 X=SQR(X)
150 X=SQR(X)
160 N=N-1
170 IF N<>0 THEN 20
180 PRINT X
182 T=TIMER
185 PRINT "Index:";34/T*loops
190 END

and a conversion of the C program:

timer=0
loops=10000
for i=0 to loops-1
r0=10
do
x=r0
x=x+1
x=x-4.567e-4
x=x+70
x=x-69
x=x*7
x=x/11
r0=r0-1
loop while r0>0
x=log(x)
x=sin(x)
x=sqr(x)
x=sqr(x)
next
print x
t=timer
print "Index:";34/t*loops

The index calculated by the unstructured version was 109
The index calculated by the structured version was 122

Why such a big difference?

Both were run on a CMM2 Gen 2 with overclock on and firmware version 05.07.01.
Edited 2021-09-03 19:58 by toml_12953

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10610

Posted: 09:57am 03 Sep 2021

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2 loops=1000
185 PRINT "Index:";T/34*loops

print "Index:";34/t*loops

Edited 2021-09-03 20:02 by matherp

toml_12953
Guru

Joined: 13/02/2015
Location: United States
Posts: 480

Posted: 10:02am 03 Sep 2021

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matherp said

185 PRINT "Index:";T/34*loops

print "Index:";34/t*loops

Yes! Thanks. You posted while I was correcting that. The difference is about what I would expect now.

That's one thing I really like about the BASIC on this machine. It's so easy to structure programs that there's no need to write spaghetti code in new programs.
The structured BASIC version was trivial to convert.

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