Need emit_expr to write right shifted value.

[zac.walker]

Hi,
 
In binutils I need to write an offset between two symbols shifted right by 2 
bits. This offset is written to the xdata section. My
code currently looks like this:
 
    exp.X_op = O_subtract;
    exp.X_add_symbol = symbol1;
    exp.X_op_symbol = symbol2;
   emit_expr (&exp, 2);
 
This works fine but obviously the result value is not shifted. Anyone have a 
good option is to shift the output of emit_expr at
write time?
 
I cannot use resolve_expression because the symbols do not have correct 
addresses at the time this code executes. 
 
Any help appreciated,
 
Zac
 
 
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