David wrote:
> If you build reflex75.asm with -lreflex75.lst (generate a listing file)
> then you can inspect what was generated for the SLEEP macro. (I've
> removed some of the macro syntax for clarity)
>
> 12 f099 24 00 bit VSYNC
If you would allow illegal opcodes, this would look like this:
> 12 f099 24 00 nop VSYNC
And there would be no problem. :-)
> If you really wanted to save a byte I think you could cook up something
> in the 7 bytes that kills the 13 cycles and reliably sets the flags. For
> instance you could remove the bit VSYNC and replace it with a LDA zpage
> and then load from a known constant (or known non-zero) and do a bne...
That's something which should be done at the *end* of programming, when
you start optimizing for space.
Have fun!
Thomas
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Thomas Jentzsch | *** Every bit is sacred ! ***
tjentzsch at web dot de |
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