CMP is PASM question

jmspaggi

Hi,

I'm trying to compare a value with 2. So I'm goind:

           rdbyte Temp, TopAddr
           cmp Temp, #2
IF_A    jmp #Above

My problem is that whatever Temp value is, it's always jumping.

First loop, Temp value is 3, so it's correct. 2nd loop, it's 2, and
3rd loop it's 1. But it's always jumping. I think I'm doing something
wrong with the way I'm using CMP. Can someone please correct me?

Thanks,

JM

kuroneko

Depending on what condition you're going to use, add wc,wz to your compare instruction. IF_A would require both of them.

jazzed

@JM,
For a conditional to work correctly, the instruction that might set the condition must specify the wc and/or wz effect.

  cmp Temp, #2 wc,wz
  if_a jmp #Above

Presumably, niether Carry nor Zero flags have been set and that causes if_a to execute. if_a is same as if_nc_and_nz.

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May you create something useful, even if it's just a hack.

jmspaggi

Ok! I see!

Thanks all for your prompt replies!

There is still some reflex I need to develop [noparse];)[/noparse]

I will continue to debug to find my other issues.

JM