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| author | Mark Dickinson <dickinsm@gmail.com> | 2009-02-09 17:15:59 (GMT) |
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| committer | Mark Dickinson <dickinsm@gmail.com> | 2009-02-09 17:15:59 (GMT) |
| commit | 87ec0855c680689898f8f0097efa18c6cb088dfd (patch) | |
| tree | 8f27f0a2a534f10deb6c20b78344aaf01567c5fb /Python/pymath.c | |
| parent | ae09899fa39bc0b9a4b79b236aa98bd5f1475134 (diff) | |
| download | cpython-87ec0855c680689898f8f0097efa18c6cb088dfd.zip cpython-87ec0855c680689898f8f0097efa18c6cb088dfd.tar.gz cpython-87ec0855c680689898f8f0097efa18c6cb088dfd.tar.bz2 | |
Merged revisions 69459 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r69459 | mark.dickinson | 2009-02-09 14:18:43 +0000 (Mon, 09 Feb 2009) | 3 lines
Issue #4575: fix Py_IS_INFINITY macro to work correctly on x87 FPUs.
It now forces its argument to double before testing for infinity.
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Diffstat (limited to 'Python/pymath.c')
| -rw-r--r-- | Python/pymath.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Python/pymath.c b/Python/pymath.c index 5cf61ab..5d09b4c 100644 --- a/Python/pymath.c +++ b/Python/pymath.c @@ -1,5 +1,18 @@ #include "Python.h" +#ifdef X87_DOUBLE_ROUNDING +/* On x86 platforms using an x87 FPU, this function is called from the + Py_FORCE_DOUBLE macro (defined in pymath.h) to force a floating-point + number out of an 80-bit x87 FPU register and into a 64-bit memory location, + thus rounding from extended precision to double precision. */ +double _Py_force_double(double x) +{ + volatile double y; + y = x; + return y; +} +#endif + #ifndef HAVE_HYPOT double hypot(double x, double y) { |