diff options
Diffstat (limited to 'Modules/mathmodule.c')
| -rw-r--r-- | Modules/mathmodule.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c index c57b77a8f6..a196834de4 100644 --- a/Modules/mathmodule.c +++ b/Modules/mathmodule.c @@ -382,11 +382,11 @@ FUNC1(tanh, tanh, 0, sum([1e+308, 1e+308, 1e-308]) raises an OverflowError due to the overflow of the first partial sum. - Note 3: The itermediate values lo, yr, and hi are declared volatile so - aggressive compilers won't algebraicly reduce lo to always be exactly 0.0. + Note 3: The intermediate values lo, yr, and hi are declared volatile so + aggressive compilers won't algebraically reduce lo to always be exactly 0.0. Also, the volatile declaration forces the values to be stored in memory as regular doubles instead of extended long precision (80-bit) values. This - prevents double rounding because any addition or substraction of two doubles + prevents double rounding because any addition or subtraction of two doubles can be resolved exactly into double-sized hi and lo values. As long as the hi value gets forced into a double before yr and lo are computed, the extra bits in downstream extended precision operations (x87 for example) will be @@ -614,7 +614,6 @@ math_factorial(PyObject *self, PyObject *arg) error: Py_DECREF(result); - Py_XDECREF(iobj); return NULL; } |