Move seperate bytes into a word

[mister_e]

this one

Z VAR WORD
A VAR Z.LOWBYTE
B VAR BYTE
C VAR Z.HIGHBYTE
D VAR BYTE

'
'    Some other code where you set A, B, C & D BYTE variables
'

Z.HIGHBYTE = Z.HIGHBYTE | (D<<4)
Z.LOWBYTE = Z.LOWBYTE | (B<<4)

ought to be the the less memory hungry.

while changing the last two line by

Z = Z | (B<<4) | (D<<12)

should use more code space.

In the above A & C are Aliases, so shouldn't need any extra RAM.

this

z=a+b<<4+c<<8+d<<12

ought to use load of RAM and time to execute... BUT this said, I'm rusty and my memory/capacity fade since few months...