From: Hans-Peter Nilsson <hp@bitrange.com>
To: Rohit Arul Raj <rohitarulraj@gmail.com>
Cc: gcc <gcc@gcc.gnu.org>
Subject: Re: clobber CC for arithmetic instructions
Date: Wed, 17 Aug 2011 06:57:00 -0000 [thread overview]
Message-ID: <alpine.BSF.2.00.1108170253070.84030@dair.pair.com> (raw)
In-Reply-To: <CAPVMLfWQcJyUoWmoR9pJ2bqek6ANi6-J0c+QDy5UVOEJQ8DoiQ@mail.gmail.com>
On Wed, 17 Aug 2011, Rohit Arul Raj wrote:
> On Sat, Aug 13, 2011 at 5:20 AM, Hans-Peter Nilsson <hp@bitrange.com> wrote:
> >> On Fri, Aug 12, 2011 at 12:17 PM, Rohit Arul Raj <rohitarulraj@gmail.com> wrote:
> >> > Setting the CCR register is done by a built-in function.
> >
> > Why is this user-controllable?
?
> > My first thought is that this is misguided.
> > Is this just a sketch or do you already have code using it?
> >
>
> We already have code using this :).
Hm. Well, I don't see how user code can observe the state other
than through asms or called functions so you could supposedly
just set a variable in the builtin and set CCR to that value
before an asm, call or return... But now I'm telling you
obvious things. Good luck.
brgds, H-P
prev parent reply other threads:[~2011-08-17 6:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-12 6:48 Rohit Arul Raj
2011-08-12 9:48 ` Rohit Arul Raj
2011-08-12 10:21 ` Richard Guenther
2011-08-12 23:51 ` Hans-Peter Nilsson
2011-08-13 0:18 ` Hans-Peter Nilsson
2011-08-17 5:59 ` Rohit Arul Raj
2011-08-17 6:57 ` Hans-Peter Nilsson [this message]
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