Assembly If/Else statement

Mag748 · 2014-08-12 07:12

Hello,

I was trying to think of how to do an If/Then statement in assembly and came up with the seemingly crude way of doing it. Although it does work fine, I wanted to know if there is a better way.

                mov      t0,       mode                  
                shr      t0,       #1        wc          ' If Mode & $01 == $01
  if_nc         jmp      #skip
                shl      tPat,     #1        wc          ' Then shift tPat right 1,
  if_nc         xor      outa,     pinMask               ' and Toggle Output if tPat & $01 == zero.
skip                                                     ' Else do nothing.

Any thoughts?

Thanks,
Marcus

kuroneko · 2014-08-12 07:32

Try this:

test    mode, #1 wz
        if_nz   shl     tPat, #1 wc
        if_a    xor     outa, pinMask

Mag748 · 2014-08-12 09:18

kuroneko wrote: »

Try this:

test    mode, #1 wz
        if_nz   shl     tPat, #1 wc
        if_a    xor     outa, pinMask

Ah ha, I though the test instruction might be needed somewhere. And I'm still wrapping my head around all the if_x conditions. That worked perfectly.

Thanks!
-Marcus

Assembly If/Else statement

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