cpython

History

Stefan Krah 67ee1d05dd word.digits are always initialized before use in the Taylor series loop, but this is more readable.		14 years ago
..
libmpdec	word.digits are always initialized before use in the Taylor series loop,	14 years ago
tests	Raise InvalidOperation if exponents of zeros are clamped during exact	14 years ago
ISSUES.txt	Issue #7652: Integrate the decimal floating point libmpdec library to speed	14 years ago
README.txt	Issue #7652: Integrate the decimal floating point libmpdec library to speed	14 years ago
_decimal.c	Issue #14478: Cache the hash of a Decimal in the C version.	14 years ago
docstrings.h	Issue #7652: Integrate the decimal floating point libmpdec library to speed	14 years ago

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).