PASM enhancement in Propeller Tool

mirror

The Propeller encourages the writing of self-modifying code.
A nice shortcut would be if in assembly code I could write something like:

        movi :dest, #or
        nop
:dest   and  var1, var2      'The and in this line will be replaced with an or
 
-- instead of --
 
        movi :dest, #%011010001
        nop
:dest   and  var1, var2

 

Ale

if you define a constant like k_or = %011010001, you could write almost that

stevenmess2004

I second the request but you have to remember that this will also include the wr, wc and wz flags which will make it a bit hard.

hippy

movi [noparse]:D[/noparse]est,#k_OR | k_WC

The problem comes with NR where to override a default WR it would have to be specified as "& ! k_NR"

or specify more complex opcode constants ...

k_OR
k_OR_WC
k_OR_NR

etc

stevenmess2004

Nice solution. You could always set the WR flag manually

So you would need to define all the instructions plus WR, WZ and WC. Too easy who will be the first to do it?

hippy

If no one steps forward I'll create a file with all the possibly named constants in it. That won't be for a few hours though as I have other things to do.

hippy

Not as easy as I thought it would be. PropTool 1.1 only seems to allow 457 CON definitions before it throws a tantrum, which discounts a complete list of constant opcodes with attributes as part of the named constants.

mirror

In my case I needed 20 different instructions, but only two of them were used more than once, so I just hardcoded the numbers into my PASM source.

The reason for my request was that this information is already available to the Propeller Tool - otherwise it wouldn't be able to compile the source!

Thanks for the thoughts and efforts of those who replied - and not only to my post, I learn so much by reading through the other posts on this forum.

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stevenmess2004

That's a weird number. Just make the condition codes seperate then. Does the same thing happen if you use more than one CON block?

stevenmess2004

hippy, I'm just going through and looking for threads to put in the prop magazine and found this. Did you ever finish the file?

hippy

I stopped at creating a list of named opcode value constants with the default WR/NR bit setting as it would be with neither specified, and bit masks for WC, WZ, WR and NR, so all these are compares...

movi [noparse]:o[/noparse]pc , #k_CMP
movi [noparse]:o[/noparse]pc , #k_CMP & k_NR
movi [noparse]:o[/noparse]pc , #k_SUB & k_NR

These are subtracts ...

movi [noparse]:o[/noparse]pc , #k_SUB
movi [noparse]:o[/noparse]pc , #k_SUB | k_WR
movi [noparse]:o[/noparse]pc , #k_CMP | k_WR

I haven't gone through the file a line at a time to check the bit values are right though !