Subject: Re: [PATCH] atomic_dec_if_positive sign extension fix

From: Segher Boessenkool <[email-masked]>
Date: Mon, 15 Jan 2007 17:01:12 +0100

> It also avoids clobbering the carry, you don't know whether a future
> version of GCC will require explicit clobbers for the carry. For now
> they are useless: you can specify "xer" in the clobber list AFAIR but
> no pattern can be split between setters and users of the carry in the
> machine description.

You can specify "cc" in the clobber list already, don't use
"xer" unless you're clobbering something else in the XER.

Segher