Requesting scratch register

[Natasha Wilson]

Hi all,

As written in MD Documentation, the pattern (clobber 
(match_scratch)) would request for a scratch register for use in 
particular insn. Is there any way to know if the scratch register 
is available for use. I would clarify on my point. I'm generating 
an insn

(parallel [(.............) (clobber (match_scratch:SI))])

That would give me a little improvement. But I don't want to 
increase the register pressure. I would like to generate the above 
insn in the situation where I could find a free scratch 
register.

Regards and Thanks
Natasha

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