Bug#724320: gmp: x32: sizeof(mp_limb_t)!=sizeof(void*) is not supported by GAP and PARI

Steve M. Robbins steve at sumost.ca
Sat Sep 28 17:38:24 CEST 2013


On September 28, 2013 10:26:33 AM Vincent Lefevre wrote:
> On 2013-09-28 09:03:53 +0200, Marc Glisse wrote:

> > the whole point of creating x32 was to benefit from the speed advantages
> > of amd64 without having a pointer size of 64 bits. Those speed advantages
> > include using more registers, but also using hardware 64 bit long long.
> > The speed difference between 32 and 64 bits [ ... ] so it doesn't make
> > sense to me to penalize x32
> I agree. PARI is not the only software that uses GMP.

OK, so I may not have been completely clear, but what I was asking is which 
makes most sense for Debian's GMP package: 8 bytes or 4 bytes.  I think what 
Marc and Vincent are saying is that 8 bytes is the better choice.  Did I read 
that correctly?

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