On Jul 14, 2012, at 3:24 AM, David Chisnall wrote:

> On 13 Jul 2012, at 17:40, Warner Losh wrote:
> 
>> We shouldn't be gating the new math on an issue that only affects sparc64 
>> machines
> 
> Mostly agreed, but it's worth noting that the APCS for ARMv8[1] specifies 
> that long double should be  IEEE 754- 2008 quad precision.  I think ARMv8 is 
> going to be an important platform for us in the next few years, so ld128 is 
> not just for SPARC (I'd also like us to switch to ld128 on PowerPC, since 
> that's the ABI that everyone else uses, but I don't anticipate PowerPC 
> becoming tier 1 any time soon, whereas I would very much like to see ARMv8 
> become tier 1 within a year of shipping silicon).
> 
> That's not to say that we should hold things up waiting for ld128 versions, 
> just that adding ld128 versions soon after adding ld80 ones would be very 
> helpful.

Agreed.  My point was more "don't gate everything on the 128-bit versions" not 
"hey, nobody do this, it is stupid."  If the 128-bit versions are ready at the 
same time as the 80-bit versions, so much the better.

Warner

> David
> 
> [1] 
> http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055a/IHI0055A_aapcs64.pdf

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