[Ktechlab-devel] instruction cycles

[deifo at ono.com]

I think this bug is not completely fixed.
I compiled svn revision 828 today, and found the following results.

This program produces a perfect square wave on pin 1, as it should.

loop:
    BSF       PORTA, 1
    NOP
    NOP
    NOP
    BCF       PORTA,1
    NOP
    GOTO      loop


This other doesn't (low value stays for twice the time of the high). Note
that it's almost the same of the first example. See attached image (example2).

loop:
    BSF       PORTA, 1
    NOP
    NOP
    ;NOP
    BCF       PORTA,1
    ;NOP
    GOTO      loop


This other is strange. The wave goes like that: 1 time high, 2 times low,
2 times high, 2 times low and repeat. It's irregular. See attached image
(example3).

loop:
    BSF       PORTA, 1
    NOP
    NOP
    ;NOP
    BCF       PORTA,1
    NOP
    GOTO      loop


This one is also irregular. It's the inverse wave of the later.

loop:
    BSF       PORTA, 1
    NOP
    NOP
    NOP
    BCF       PORTA,1
    ;NOP
    GOTO      loop


This is always on low.

loop:
    BSF       PORTA, 1
    ;NOP
    ;NOP
    ;NOP
    BCF       PORTA,1
    ;NOP  ; 0 or more NOP here
    GOTO      loop


Also I attached 2 more backtraces.
If you want more information just ask. I'm happy to help.






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