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Re: [PATCH] gcc 3.4 drops "accum" clobber, replace with "hi" intime.c

To: <linux-mips@linux-mips.org>, "Eric Christopher" <echristo@redhat.com>
Subject: Re: [PATCH] gcc 3.4 drops "accum" clobber, replace with "hi" intime.c
From: "Bradley D. LaRonde" <brad@laronde.org>
Date: Mon, 12 Apr 2004 21:05:34 -0400
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <Pine.GSO.4.10.10404122244110.8735-100000@helios.et.put.poznan.pl> <20040412231309.GA702@linux-mips.org> <03f301c420e7$d8de2d70$8d01010a@prefect> <048e01c420f1$ad4ae3b0$8d01010a@prefect> <1081818125.19719.14.camel@dzur.sfbay.redhat.com>
Sender: linux-mips-bounce@linux-mips.org
----- Original Message ----- 
From: "Eric Christopher" <echristo@redhat.com>
To: "Bradley D. LaRonde" <brad@laronde.org>
Cc: <linux-mips@linux-mips.org>
Sent: Monday, April 12, 2004 9:02 PM
Subject: Re: [PATCH] gcc 3.4 drops "accum" clobber, replace with "hi"
intime.c


> On Mon, 2004-04-12 at 17:53, Bradley D. LaRonde wrote:
> > Uh oh, with this patch:
> >
> > ...
> > time.c: In function `fixed_rate_gettimeoffset':
> > time.c:242: error: can't find a register in class `HI_REG' while
reloading
> > `asm'
> > ...
>
> > >
> > >         /*
> > >          * Due to possible jiffies inconsistencies, we need to check
> > > @@ -339,7 +339,7 @@
> > >                                 : "r" (timerhi), "m" (timerlo),
> > >                                   "r" (tmp), "r" (USECS_PER_JIFFY),
> > >                                   "r" (USECS_PER_JIFFY_FRAC)
> > > -                               : "hi", "lo", "accum");
> > > +                               : "hi", "lo", "hi");
> > >                         cached_quotient = quotient;
>
>
> Maybe this hunk where you use "hi" twice for the same asm statement?

Yeah, that's messed up, but it fails here too:

@@ -242,7 +242,7 @@
        __asm__("multu  %1,%2"
                : "=h" (res)
                : "r" (count), "r" (sll32_usecs_per_cycle)
-               : "lo", "accum");
+               : "lo", "hi");

Regards,
Brad


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