cpython

History

Stefan Krah b7832939c7 1) Fix signature of _mpd_qpow_uint(): contrary to the comment base is constant. 2) Abort the loop for all specials, not only infinity. 3) Make the function more general and distinguish between zero clamping and folding down the exponent. The latter case is currently handled by setting context->clamp to 0 before calling the function.		2012-06-12 21:06:06 +02:00
..
libmpdec	1) Fix signature of _mpd_qpow_uint(): contrary to the comment base is constant.	2012-06-12 21:06:06 +02:00
tests	Raise InvalidOperation if exponents of zeros are clamped during exact	2012-04-05 15:21:58 +02:00
ISSUES.txt	…
README.txt	…
_decimal.c	Issue #14478 : Cache the hash of a Decimal in the C version.	2012-04-10 16:27:58 +02:00
docstrings.h	…

README.txt


About
=====

_decimal.c is a wrapper for the libmpdec library. libmpdec is a fast C
library for correctly-rounded arbitrary precision decimal floating point
arithmetic. It is a complete implementation of Mike Cowlishaw/IBM's
General Decimal Arithmetic Specification.


Build process for the module
============================

As usual, the build process for _decimal.so is driven by setup.py in the top
level directory. setup.py autodetects the following build configurations:

   1) x64         - 64-bit Python, x86_64 processor (AMD, Intel)

   2) uint128     - 64-bit Python, compiler provides __uint128_t (gcc)

   3) ansi64      - 64-bit Python, ANSI C

   4) ppro        - 32-bit Python, x86 CPU, PentiumPro or later

   5) ansi32      - 32-bit Python, ANSI C

   6) ansi-legacy - 32-bit Python, compiler without uint64_t

   7) universal   - Mac OS only (multi-arch)


It is possible to override autodetection by exporting:

   PYTHON_DECIMAL_WITH_MACHINE=value, where value is one of the above options.


NOTE
====
 
decimal.so is not built from a static libmpdec.a since doing so led to
failures on AIX (user report) and Windows (mixing static and dynamic CRTs
causes locale problems and more).