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Postings from December 2000
On Tue, Dec 05, 2000 at 09:30:11PM +0000, Nicholas Clark wrote:
> Jarkko (or anyone else who might know)
>
> why did you use SvIVx rather than SvIV or SvIVX in your pp_add implementation?
Phase of the moon.
> What's the difference between these 3 (and SvIVXx)?
So, 4...
I must admit that I've never studied this in enough detail.
But based on quick investigation by cpp, or by glaring at sv.h:
SvIV(x)
(((x)->sv_flags & 0x00010000) ? ((XPVIV*) (x)->sv_any)->xiv_iv : Perl_sv_2iv(thr, x))
SvIVx(x)
Perl_sv_iv(thr, x)
SvIVX(x)
((XPVIV*) (x)->sv_any)->xiv_iv
SvIVXx(x)
((XPVIV*) (x)->sv_any)->xiv_iv
So SvIV(x) is SvIOK(x) conditional SvIVX(x) or sv_2iv(), SvIVX(x) is
direct peek at the iv field, and SvIVXx(x) is just an alias for SvIVX(x).
> Would it be possible to add
>
> --- ../bleadperl-NV/pp.h Sat Sep 2 17:52:58 2000
> +++ pp.h Mon Dec 4 19:29:51 2000
> @@ -126,6 +126,7 @@
> #endif
>
> #define TOPs (*sp)
> +#define TOPm1s (*(sp-1))
I'll add that. Or maybe PEEKs(i)? (And POKEs(i,sv)? :-)
> #define TOPp (SvPV(TOPs, PL_na)) /* deprecated */
> #define TOPpx (SvPV(TOPs, n_a))
> #define TOPn (SvNV(TOPs))
>
> to the bleadperl as it would make things easier for getting 64 bit
> preservation without (I'm pretty sure) breaking anything for anyone
> else?
>
> Nicholas Clark
--
$jhi++; # http://www.iki.fi/jhi/
# There is this special biologist word we use for 'stable'.
# It is 'dead'. -- Jack Cohen
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