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

[Paul Brook]

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