cpython

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History

Stefan Krah 22385011ed Many cleanups of redundant code in mpd_qrem_near(): 1) _mpd_qdivmod() uses the context precision only in two places, and the new code should be exactly equivalent to the previous code. 2) Remove misleading comment. 3) The quotient is an integer with exponent 0, so calling mpd_qtrunc() is pointless. 4) Replace two instances of identical code by a single one. 5) Use _mpd_cmp_abs() instead of mpd_cmp_total_mag(): the operands are not special. 6) Don't clear MPD_Rounded in the status (with the current code it should not be set within the function).		2012-06-20 23:34:58 +02:00
..
libmpdec	Many cleanups of redundant code in mpd_qrem_near():	2012-06-20 23:34:58 +02:00
tests	Raise InvalidOperation if exponents of zeros are clamped during exact	2012-04-05 15:21:58 +02:00
_decimal.c	Issue #14478 : Cache the hash of a Decimal in the C version.	2012-04-10 16:27:58 +02:00
docstrings.h	Issue #7652 : Integrate the decimal floating point libmpdec library to speed	2012-03-21 18:25:23 +01:00
ISSUES.txt	Issue #7652 : Integrate the decimal floating point libmpdec library to speed	2012-03-21 18:25:23 +01:00
README.txt	Issue #7652 : Integrate the decimal floating point libmpdec library to speed	2012-03-21 18:25:23 +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).