how to eval a expression before the Match?

In order not to bother everyone here, I didn't post all my intention in the first post. Sorry.

Actually, I wanna write a Macroinstruction to display values of some constants. Of course, there's an example in manual pages which displays 32bit value, however, I intend to write a macro which could display the value of constant in spite of its length. I wrote the following code:

Code:

macro   output value {
        display "0x"
        repeat 16  ; 64bit number
                tmp = (value shr ((% - 1) * 4))
                nybble = tmp and 0xf
                if tmp <> 0
                        if nybble > 9
                                char = 'A' + nybble - 9 - 1
                        else
                                char = '0' + nybble
                        end if
                        display char
                end if
        end repeat
}

output  0xabcdef1234567890

The problem is "output" macro will display the value in reverse order. As I remembered there's an example of 'append' macro in the manual, which could help build macro args, I change the code to :

Code:

list equ
macro append item
{
        match   any, list \{ list equ list, item\}
        match   , list  \{list equ item\}
}

macro   display_nybble [arg]
{
        reverse display arg
}


macro   output value {
        display "0x"
        repeat 16   ; 64bit number
                tmp = (value shr ((% - 1) * 4))
                nybble = tmp and 0xf
                if tmp <> 0
                        if nybble > 9
                                char = 'A' + nybble - 9 - 1
                        else
                                char = '0' + nybble
                        end if
                         ; append char to list
                        append char
                end if
        end repeat
}

output  0xabcdef1234567890

match params, list {display_nybble params}

It doesn't work either, cause the 'match' is processed before the calculations. Should I think in another way?
Thanks in advance.