Never mind, I found it
http://www.codelearn.com/cpp/gcc/
"Garst R. Reese" wrote:
> 
> .data
>         .comm   rxdata,1,1              ;char var
>         .comm   rxshift,1,1             ;char var
>         .comm   rxbit,2,2               ;short var, aligned
> 
> I can't find a reference to meaning .comm in the assembler directives in
> as_4.pdf.
> Which FM should I be R'ing?

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