Re: Best way to check for 64-bit support

There are many ways to look at the size of integers :)

If you *also* want to support 64bit ints on a 32bit conf, you could consider if Math::BigInt could help

You did not state if your realm is pure-perl or also XS. If you know how to work around your problem in XS, you could pass the big ints as string and work from there.

In the pure-perl world, an "integer" is an IV (Integer Value). Its size in bytes is shown in $Config{ivsize}. Internally an IV does not need to be mapped to an int, but it might be a long or even long long.

$ perl -V:.*64bit.*
use64bitall='define';
use64bitint='define';

$ perl -V:.*size.*
charsize='1';
d_chsize='undef';
d_malloc_good_size='undef';
d_malloc_size='undef';
doublesize='8';
fpossize='16';
gidsize='4';
i16size='2';
i32size='4';
i64size='8';
i8size='1';
intsize='4';
ivsize='8';
longdblsize='16';
longlongsize='8';
longsize='8';
lseeksize='8';
nvsize='16';
ptrsize='8';
shortsize='2';
sig_size='68';
sizesize='8';
sizetype='size_t';
socksizetype='socklen_t';
ssizetype='ssize_t';
st_ino_size='8';
u16size='2';
u32size='4';
u64size='8';
u8size='1';
uidsize='4';
uvsize='8';
[download]

Enjoy, Have FUN! H.Merijn

Comment on Re: Best way to check for 64-bit support Select or Download Code

Replies are listed 'Best First'.
Re^2: Best way to check for 64-bit support by eyepopslikeamosquito (Archbishop) on Sep 08, 2021 at 13:15 UTC
Internally an IV does not need to be mapped to an int, but it might be a long or even long long Indeed. I'd go further and speculate that an `IV` is mapped to a `long` or `long long` on almost all 64-bit platforms because the two overwhelmingly dominant 64-bit programming models (`LP64` and `LLP64`) both use 32-bit `ints`. That is, I'd expect to see: `intsize='4'; ivsize='8';` [download] on just about every 64-bit Perl. I remember this from a fascinating thread a few months back, where syphilis noted he's "never struck a perl where $Config{intsize} != 4".	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^2: Best way to check for 64-bit support
by eyepopslikeamosquito (Archbishop) on Sep 08, 2021 at 13:15 UTC

Internally an IV does not need to be mapped to an int, but it might be a long or even long long

Indeed. I'd go further and speculate that an IV is mapped to a long or long long on almost all 64-bit platforms because the two overwhelmingly dominant 64-bit programming models (LP64 and LLP64) both use 32-bit ints. That is, I'd expect to see:

intsize='4';
ivsize='8';
[download]

I remember this from a fascinating thread a few months back, where syphilis noted he's "never struck a perl where $Config{intsize} != 4".

[reply]
[d/l]
[select]