Date: Wed, 10 Jan 2001 22:24:26 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Peter Jeremy <peter.jeremy@alcatel.com.au> Cc: Warner Losh <imp@harmony.village.org>, Matt Jacob <mjacob@FreeBSD.ORG>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/alpha/include bus.h Message-ID: <Pine.BSF.4.21.0101102224020.4758-100000@beppo.feral.com> In-Reply-To: <20010111163029.B91242@gsmx07.alcatel.com.au>
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Why isn't it a valid test? This is exactly the test case that Warner was
worrying about?
On Thu, 11 Jan 2001, Peter Jeremy wrote:
> On 2001-Jan-09 22:04:03 -0800, Matthew Jacob <mjacob@feral.com> wrote:
> >
> >
> >> In message <200101091817.f09IHng10622@freefall.freebsd.org> Matt Jacob writes:
> >> : me that BUS_SPACE_UNRESTRICTED should b ~0UL, not ~0.
> >>
> >> Would this impact the 10E6 uses of ~0 in the bus_alloc_resource calls
> >> we have?
> >
> >int foo()
> >{
> > bar(~0);
> >}
> >int zoo()
> >{
> > bar1(~0UL);
> >}
> ...
> >Sorta looks the same to me....
>
> I don't think that's a valid test. A more reasonable test would be
> something like
>
> unsigned long foo, bar;
>
> fun()
> {
> foo = bar & ~0;
> }
>
> Unfortunately, I don't have a functional FreeBSD/Alpha box right now,
> but both Compaq CC and gcc-2.8.1 generate "foo = bar". I'm not sure
> that this behaviour makes sense.
>
> Peter
>
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