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author | Mark Dickinson <dickinsm@gmail.com> | 2009-04-16 19:52:09 (GMT) |
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committer | Mark Dickinson <dickinsm@gmail.com> | 2009-04-16 19:52:09 (GMT) |
commit | b08a53a99def3fa949643974f713b5b189e21bc7 (patch) | |
tree | 6f7663d510099fd7acfa328ae5a5c88e3eddb1a7 /Python/sysmodule.c | |
parent | 579b65c2d695eb468fb97568ff7d2ad9d261b2b3 (diff) | |
download | cpython-b08a53a99def3fa949643974f713b5b189e21bc7.zip cpython-b08a53a99def3fa949643974f713b5b189e21bc7.tar.gz cpython-b08a53a99def3fa949643974f713b5b189e21bc7.tar.bz2 |
Issue #1580: use short float repr where possible.
- incorporate and adapt David Gay's dtoa and strtod
into the Python core
- on platforms where we can use Gay's code (almost
all!), repr(float) is based on the shortest
sequence of decimal digits that rounds correctly.
- add sys.float_repr_style attribute to indicate
whether we're using Gay's code or not
- add autoconf magic to detect and enable SSE2
instructions on x86/gcc
- slight change to repr and str: repr switches
to exponential notation at 1e16 instead of
1e17, str switches at 1e11 instead of 1e12
Diffstat (limited to 'Python/sysmodule.c')
-rw-r--r-- | Python/sysmodule.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Python/sysmodule.c b/Python/sysmodule.c index 443d8eb..262f5a1 100644 --- a/Python/sysmodule.c +++ b/Python/sysmodule.c @@ -1025,6 +1025,7 @@ platform -- platform identifier\n\ executable -- pathname of this Python interpreter\n\ prefix -- prefix used to find the Python library\n\ exec_prefix -- prefix used to find the machine-specific Python library\n\ +float_repr_style -- string indicating the style of repr() output for floats\n\ " ) #ifdef MS_WINDOWS @@ -1428,6 +1429,15 @@ _PySys_Init(void) FlagsType.tp_init = NULL; FlagsType.tp_new = NULL; + /* float repr style: 0.03 (short) vs 0.029999999999999999 (legacy) */ +#ifndef PY_NO_SHORT_FLOAT_REPR + SET_SYS_FROM_STRING("float_repr_style", + PyUnicode_FromString("short")); +#else + SET_SYS_FROM_STRING("float_repr_style", + PyUnicode_FromString("legacy")); +#endif + #undef SET_SYS_FROM_STRING if (PyErr_Occurred()) return NULL; |