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gh-69639: Add mixed-mode rules for complex arithmetic (C-like) (GH-124829)

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"Generally, mixed-mode arithmetic combining real and complex variables should
be performed directly, not by first coercing the real to complex, lest the sign
of zero be rendered uninformative; the same goes for combinations of pure
imaginary quantities with complex variables." (c) Kahan, W: Branch cuts for
complex elementary functions.

This patch implements mixed-mode arithmetic rules, combining real and
complex variables as specified by C standards since C99 (in particular,
there is no special version for the true division with real lhs
operand).  Most C compilers implementing C99+ Annex G have only these
special rules (without support for imaginary type, which is going to be
deprecated in C2y).
This commit is contained in:
Sergey B Kirpichev 2024-11-26 18:57:39 +03:00 • committed by GitHub
parent dcf629213b
commit 987311d42e
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15 changed files with 449 additions and 98 deletions
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12
Objects/floatobject.c
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@ -341,16 +341,16 @@ PyFloat_AsDouble(PyObject *op)
obj is not of float or int type, Py_NotImplemented is incref'ed,
stored in obj, and returned from the function invoking this macro.
*/
#define CONVERT_TO_DOUBLE(obj, dbl) \
if (PyFloat_Check(obj)) \
dbl = PyFloat_AS_DOUBLE(obj); \
else if (convert_to_double(&(obj), &(dbl)) < 0) \
#define CONVERT_TO_DOUBLE(obj, dbl) \
if (PyFloat_Check(obj)) \
dbl = PyFloat_AS_DOUBLE(obj); \
else if (_Py_convert_int_to_double(&(obj), &(dbl)) < 0) \
return obj;
/* Methods */
static int
convert_to_double(PyObject **v, double *dbl)
int
_Py_convert_int_to_double(PyObject **v, double *dbl)
{
PyObject *obj = *v;