How to add target specific dependency?

[Ian Lance Taylor]

petruk_gile <petsbags@gmail.com> writes:

> The case is like this:
> In the machine description (*.md) file, sometimes I emit a single RTL
> instruction into multiple ASM instruction. The problem is, in some case I
> need to emit an operand that actually doesn't exist in its RTL
> representation. For example :
> 
> "movpqi_insn x,y" instruction will be translated as ==> "sar x, *ar15"  and 
> "lar y, *ar15"   

It's probably better to split the insn.  But if you can't do that, you
need to modify the RTL to add (use (reg ar15)).

Ian