Bill Allombert on Fri, 28 May 2010 18:25:45 +0200

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Re: integer representation in pari

On Fri, May 28, 2010 at 11:13:11AM -0400, Sam Steingold wrote:
> Hi,
> On 5/27/10, Bill Allombert <> wrote:
> >
> >  You can also check whether the C macro PARI_KERNEL_GMP is defined,
> >  but usually it is better to use int_W() to acces the mantissa.
> thanks!
> can I also use int_W to access the mantissa of a t_REAL?
> (it never explicitly says that, but ...)

No you cannot. t_REAL mantissa is always in HIGH bytes first,
so this would not work with the GMP kernel. Note that
t_REAL mantissa is normalized (i.e. first bit is one).