From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: "Andreas Färber" <planche2k@googlemail.com>
Subject: Re: [Qemu-devel] TCG: 128 bit ops?
Date: Sun, 7 Sep 2008 15:01:13 +0100 [thread overview]
Message-ID: <200809071501.13837.paul@codesourcery.com> (raw)
In-Reply-To: <D1F4A45F-4F7A-477E-8045-4886C45949BA@gmail.com>
On Thursday 04 September 2008, 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.
Does it really have 128-bit ops, or just 128-bit vectors with smaller
elements?
I expect that implementing native 128-bit support would end up fairly tricky.
It's bad enough having to handle 64-bit ops 32-bit x86.
Paul
prev parent reply other threads:[~2008-09-07 14:01 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
2008-09-07 14:01 ` Paul Brook [this message]
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