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Re: [Qemu-devel] TCG: 128 bit ops?


From: Aurelien Jarno
Subject: Re: [Qemu-devel] TCG: 128 bit ops?
Date: Thu, 4 Sep 2008 16:35:19 +0200
User-agent: Mutt/1.5.18 (2008-05-17)

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.

-- 
  .''`.  Aurelien Jarno             | GPG: 1024D/F1BCDB73
 : :' :  Debian developer           | Electrical Engineer
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