NAME

   Math::Int128 - Manipulate 128 bits integers in Perl

SYNOPSIS

     use Math::Int128 qw(int128);

     my $i = int128(1);
     my $j = $i << 100;
     my $k = int128("1234567890123456789000000");
     print($i + $j * 1000000);

DESCRIPTION

   This module adds support for 128 bit integers, signed and unsigned, to
   Perl.

   In order to compile this module, your compiler must support one of
   either the __int128 or int __attribute__ ((__mode__ (TI))) types. Both
   GCC and Clang have supported one or the other type for some time, but
   they may only do so on 64-bit platforms.

OSX Caveat

   On OSX, the system Perl is compiled with both the "-arch x86_64" and
   "-arch i386" flags. When building this module with a Perl like this, we
   strip the "-arch i386" flag out, meaning it is only compiled for the
   64-bit architecture. Attempting to use this module while running in
   32-bit mode may lead to brokenness. It's also possible that this will
   cause other problems that we cannot foresee.

   Note that if you have built your own non-multiarch Perl on OSX then
   this will not be an issue.

API

   See Math::Int64. This module provides a similar set of functions, just
   s/64/128/g ;-)

   Besides that, as object allocation and destruction has been found to be
   a bottleneck, an alternative set of operations that use their first
   argument as the output (instead of the return value) is also provided.

   They are as follows:

     int128_inc int128_dec int128_add int128_sub int128_mul int128_pow
     int128_div int128_mod int128_divmod int128_and int128_or int128_xor
     int128_left int128_right int128_not int128_neg

   and the corresponding uint128 versions.

   For instance:

     my $a = int128("1299472960684039584764953");
     my $b = int128("-2849503498690387383748");
     my $ret = int128();
     int128_mul($ret, $a, $b);
     int128_inc($ret, $ret); # $ret = $ret + 1
     int128_add($ret, $ret, "12826738463");
     say $ret;

   int128_divmod returns both the result of the division and the
   remainder:

     my $ret = int128();
     my $rem = int128();
     int128_divmod($ret, $rem, $a, $b);

C API

   The module provides a C API that allows to wrap/unwrap int128_t and
   uint128_t values from other modules written in C/XS.

   It is identical to that provided by Math::Int64 so read the
   documentation there in order to know how to use it.

TODO

   Support more operations as log2, pow, etc.

BUGS AND SUPPORT

   The C API feature is experimental.

   This module requires 128bit integer support from the C compiler.
   Currently only gcc 4.4 and later are supported. If you have a different
   compiler that also supports 128bit integers get in touch with me in
   order to have it supported.

   You can send me bug reports by email to the address that appears below
   or use the CPAN RT bug tracking system available at http://rt.cpan.org.

   The source for the development version of the module is hosted at
   GitHub: https://github.com/salva/p5-Math-Int128.

My wishlist

   If you like this module and you're feeling generous, take a look at my
   Amazon Wish List: http://amzn.com/w/1WU1P6IR5QZ42

SEE ALSO

   Math::Int64, Math::GMP, Math::GMPn.

   http://perlmonks.org/?node_id=886488.

COPYRIGHT AND LICENSE

   Copyright © 2007, 2009, 2011-2014 by Salvador Fandiño
   ([email protected])

   Copyright © 2014 by Dave Rolsky

   This library is free software; you can redistribute it and/or modify it
   under the same terms as Perl itself, either Perl version 5.10.1 or, at
   your option, any later version of Perl 5 you may have available.