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, 2011-2015 by Salvador Fandiño (sfandino@yahoo.com)

       Copyright © 2014-2015 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.