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| [poby-news] first test |
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Posted by: nitrofurano - 2014-10-23, 01:19 PM - Forum: Other Archs
- No Replies
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first test for Poby-News arcade machine:
<!-- m --><a class="postlink" href="https://dl.dropboxusercontent.com/u/795795/retrocoding/arcade/PobyNews/example01c_works.zip">https://dl.dropboxusercontent.com/u/795 ... _works.zip</a><!-- m -->
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| Optimizer bug (*solved*) |
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Posted by: einar - 2014-10-17, 08:50 PM - Forum: Bug Reports
- Replies (2)
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I found an error in ZX BASIC optimizer. Take a look at this test program:
Code: GO TO 10
sub FASTCALL test(flag AS UBYTE)
asm
cp 1
jp m,45000
jp 50000
end asm
end sub
10 POKE 50000,201: POKE 45000,201
test(1)
This program produces the expected result if you compile it as follows:
Code: zxb.exe -t -O2 prog.bas
However it will refuse to compile if you use this instead:
Code: zxb.exe -t -O3 prog.bas
In this latter case it will produce this error message:
Code: C:>zxb.exe -t -O3 prog.bas
Traceback (most recent call last):
File "zxb.py", line 348, in <module>
File "zxb.py", line 301, in main
File "optimizer.pyc", line 2287, in optimize
File "optimizer.pyc", line 1493, in update_goes_and_comes
KeyError: '45000'
EDIT: Tested using latest ZX BASIC version 1.4.0s1898.
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| Serious bug indexing arrays (*solved*) |
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Posted by: einar - 2014-09-29, 04:48 AM - Forum: Bug Reports
- Replies (4)
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Try running this program:
Code: DIM score(1 TO 2) AS UBYTE
DIM player AS UBYTE
LET score(1)=0
LET score(2)=0
LET player = 1
LET score(player)=score(player)+1
PRINT "SCORE ";score(1);"x";score(2)
The result will be "SCORE 0x1". This code was supposed to increment the score for player 1, but it will increment it for player 2 instead!
Now try changing this program as follows:
Code: DIM score(1 TO 2) AS UBYTE
DIM player AS UBYTE
LET score(1)=0
LET score(2)=0
LET player = 1
LET score(1)=score(1)+1
PRINT "SCORE ";score(1);"x";score(2)
Now it will give the correct result "SCORE 1x0".
Tested using latest ZX BASIC release 1.4.0s1893.
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