cpython

History

Stefan Krah c35a8e5c98 Proactive reliability fix for broken FPUs: The base conversion functions use log10() to calculate the size of the output array. The current code has been tested on x86/amd64 (and to a lesser extent on qemu-mips qemu-sparc) and produces sufficiently large values for all inputs tested so far (coefficient sizes of 10**18 - 1 are hard to test exhaustively). The new code does not rely on the correctness of log10() and resizes the output arrays if the allocated space is insufficient.		2012-06-30 18:05:33 +02:00
..
libmpdec	Proactive reliability fix for broken FPUs: The base conversion functions	2012-06-30 18:05:33 +02:00
tests	Update test script to Visual Studio 2010.	2012-06-25 14:41:37 +02:00
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
_decimal.c	Proactive reliability fix for broken FPUs: The base conversion functions	2012-06-30 18:05:33 +02:00
docstrings.h	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).