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Math::BigInt::FastCalc - Math::BigInt::Calc with some XS for more speed


Provides support for big integer calculations. Not intended to be used by other modules. Other modules which sport the same functions can also be used to support Math::BigInt, like Math::BigInt::GMP or Math::BigInt::Pari.


In order to allow for multiple big integer libraries, Math::BigInt was rewritten to use library modules for core math routines. Any module which follows the same API as this can be used instead by using the following:

use Math::BigInt lib => 'libname';

'libname' is either the long name ('Math::BigInt::Pari'), or only the short version like 'Pari'. To use this library:

use Math::BigInt lib => 'FastCalc';

Note that from Math::BigInt v1.76 onwards, FastCalc will be loaded automatically, if possible.


FastCalc works exactly like Calc, in stores the numbers in decimal form, chopped into parts.


The following functions are now implemented in FastCalc.xs:

_is_odd		_is_even	_is_one		_is_zero
_is_two		_is_ten
_zero		_one		_two		_ten
_acmp		_len
_inc		_dec
__strip_zeros	_copy


Please report any bugs or feature requests to bug-math-bigint-fastcalc at, or through the web interface at (requires login). We will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


You can find documentation for this module with the perldoc command.

perldoc Math::BigInt::FastCalc

You can also look for information at:


This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.


Original math code by Mark Biggar, rewritten by Tels in late 2000. Separated from BigInt and shaped API with the help of John Peacock.

Fixed, sped-up and enhanced by Tels 2001-2003. Further streamlining (api_version 1 etc.) by Tels 2004-2007.

Bug-fixing by Peter John Acklam <> 2010-2015.


Math::BigInt, Math::BigFloat, and the other backends Math::BigInt::Calc, Math::BigInt::GMP, and Math::BigInt::Pari.