cpython

mirror of https://github.com/python/cpython synced 2024-09-15 23:57:10 +00:00

History

Serhiy Storchaka 96aeaec647 bpo-36793: Remove unneeded __str__ definitions. (GH-13081) Classes that define __str__ the same as __repr__ can just inherit it from object.		2019-05-06 22:29:40 +03:00
..
libmpdec	bpo-35059, libmpdec: Add missing EXTINLINE in mpdecimal.h (GH-10128)	2018-10-26 17:06:57 +02:00
tests	bpo-31403: Remove WITHOUT_THREADS from _decimal. (#3474 )	2017-09-09 19:26:22 +02:00
_decimal.c	bpo-36793: Remove unneeded __str__ definitions. (GH-13081)	2019-05-06 22:29:40 +03:00
docstrings.h	Issue #25928 : Add Decimal.as_integer_ratio(). Python parts and docs by	2015-12-28 23:02:02 +01:00
README.txt	Remove trailing whitespace.	2013-01-16 15:16:10 +01:00

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).