From: "Blue Swirl" <blauwirbel@gmail.com>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] TCG: 128 bit ops?
Date: Thu, 4 Sep 2008 18:30:28 +0300 [thread overview]
Message-ID: <f43fc5580809040830q50df2f92ja03c853ed60819ac@mail.gmail.com> (raw)
In-Reply-To: <20080904143519.GA11924@volta.aurel32.net>
On 9/4/08, Aurelien Jarno <aurelien@aurel32.net> wrote:
> On Thu, Sep 04, 2008 at 01:10:39PM +0200, Andreas Färber wrote:
> > Hello,
> >
> > Am I correct in seeing that TCG offers no i128 ops? Would this be useful
> > to add to TCG, internally reusing the i64/i32 code? ppc needs 128-bit
> > temporaries for Altivec instructions. It uses a union ppc_avr_t of (among
> > others) two uint64_t.
> >
> > Or should I just use two i64 temporaries with a local macro/helper?
> > It's not used much in ppc but I thought it might be useful to share with
> > other architectures.
> >
>
>
> Currently TCG doesn't support i128 ops, but I also agree it would be
> nice to have it. I think it can benefits for example to sparc64 which
> has 128-bit fp support.
I agree that i128 would be useful, though float32/64/80/128 would be
even more so.
Sparc (32 and 64) specifications have included 128 bit float ops since
day one, but so far they haven't been implemented in real CPUs.
next prev parent reply other threads:[~2008-09-04 15:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-04 11:10 [Qemu-devel] TCG: 128 bit ops? Andreas Färber
2008-09-04 14:35 ` Aurelien Jarno
2008-09-04 15:30 ` Blue Swirl [this message]
2008-09-07 14:01 ` Paul Brook
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