@WORD Modifier
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Any symbol followed by `@word' will be replaced by the symbol's value
shifted right by 2. This is used in situations such as loading a
register with the address of a function (or any other code fragment).
For example, if you want to load a register with the location of the
function `main' then jump to that function, you could do it as follws:
ldi r2, main@word
jmp r2